Sep. 05, 2019 – Tropical Storm Faxai Gets a Name and NASA Gets an Infrared Picture
Tropical Storm 14W has been moving through the Northwestern Pacific Ocean for several days and has now been renamed Faxai. NASA’s Aqua satellite passed over the newly renamed storm and took the temperature of Faxai’s clouds and storms.
On Sept. 5 at 8:15 a.m. EDT (1215 UTC), the MODIS instrument that flies aboard NASA’s Aqua satellite showed strongest storms around Faxai’s center and in a curved band of thunderstorms from west to north to east. In those areas, cloud top temperatures were as cold as minus 70 degrees Fahrenheit (minus 56.6 Celsius). Credit: NASA/NRL
NASA’s Terra satellite used infrared light to analyze the strength of storms in the remnants of Tropical Storm Faxai. Infrared data provides temperature information, and the strongest thunderstorms that reach high into the atmosphere have the coldest cloud top temperatures.
On Sept. 5 at 8:15 a.m. EDT (1215 UTC), the Moderate Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Terra satellite found strongest thunderstorms had cloud top temperatures as cold as or colder than minus 70 degrees Fahrenheit (minus 56.6 Celsius). Those temperatures were in cloud tops of storms around the low-level center of circulation and in a thick band of thunderstorms that wrapped around the storm from west to north to east. Cloud top temperatures that cold indicate strong storms with the potential to generate heavy rainfall.
The imagery also showed the southwestern side was cloud free, and that is because of sinking air, or subsidence, which prevents the development of thunderstorms. It is being caused by an elongated area of low pressure located to the south of the storm and a Tutt Cell to the north. A Tutt Cell is a Tropical Upper Tropospheric Trough (elongated area of low pressure).
On Sept. 5 at 11 a.m. EDT (1500 UTC), Tropical Storm Faxai, formerly known as 14W, was located near 20.8 degrees north latitude and 154.0 degrees east longitude. That is about 742 nautical miles east-southeast of Iwo To island, Japan. Faxai was moving to the north-northwest and had maximum sustained winds 40 knots (46 mph/74 kph).
The Joint Typhoon Warning Center (JTWC) expects Faxai will move west-northwest across the Northwestern Pacific Ocean and turn north after three days. It is expected to make landfall near Tokyo at 80 knots on Sunday, Sept. 8.
Sep. 05, 2019 – Satellite Finds a “Hook” of Heavy Rainfall in Hurricane Juliette
From its vantage point in orbit around the Earth, when the Global Precipitation Measurement mission or GPM core satellite passed over the Eastern Pacific Ocean, it gathered data on rainfall rates occurring in Hurricane Juliette. The areas of strongest rainfall resembled a hook.
The GPM core satellite passed over Juliette on Sept. 5 at 8:46 a.m. EDT (1246 UTC). GPM found the heaviest rainfall (purple) in the northwest of thunderstorms circling the center where it was falling at a rate of over 36 mm (about 1.4 inch) per hour. Heavy rainfall of about 25 mm (1 inch per hour) (in yellow and orange) stretched east and south in that same band circling the eye of the storm, giving the appearance of a hook around the storm’s eye. Credit: NASA/JAXA/NRL
The GPM satellite passed over Juliette on Sept. 5 at 8:46 a.m. EDT (1246 UTC). GPM found the heaviest rainfall in the northwest of thunderstorms circling the center where it was falling at a rate of over 36 mm (about 1.4 inch) per hour. Heavy rainfall of about 25 mm (1 inch per hour) stretched east and south in that same thunderstorm band circling the eye of the storm, giving the appearance of a hook around the storm’s eye. GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.
At 5 a.m. EDT (2 a.m. PDT) on Sept. 5, the National Hurricane Center (NHC) noted, “Juliette’s cloud pattern has changed little during the past several hours. If anything, the spiral bands appear to have improved a bit in the western portion of the cyclone.” At that time, the center of Hurricane Juliette was located near latitude 20.2 degrees north and longitude 119.1 degrees west. That’s about 620 miles (995 km) west-southwest of the southern tip of Baja California, Mexico.
Juliette is moving toward the northwest near 9 mph (15 kph). The hurricane is expected to move to the west-northwest at a slightly faster forward speed on Friday and should continue this motion through Saturday. Maximum sustained winds remain near 90 mph (150 kph) with higher gusts. The estimated minimum central pressure is 976 millibars.
Gradual weakening is forecast to resume today [Sept. 5] as the storm is expected to move over cooler sea surface temperature and encounter dry air and outside winds (vertical wind shear). Further weakening is expected during the next several days. Juliette should weaken to a tropical storm on Friday.
NASA-NOAA’s Suomi NPP satellite passed over the eastern Atlantic Ocean and infrared data revealed that the storm was being adversely affected by wind shear, pushing its strongest storms northeast of its center.
NASA-NOAA’s Suomi NPP satellite passed over Tropical Storm Gabrielle and the VIIRS instrument aboard captured this image of the storm on Sept. 5 at 12:18 a.m. EDT (0418 UTC). Suomi NPP found strongest thunderstorms north of the center had cloud top temperatures as cold as minus 70 degrees Fahrenheit (minus 56.6 Celsius). Credit: NASA/NOAA/NRL
NASA-NOAA’s Suomi NPP satellite used infrared light to analyze the strength of storms in the remnants of Tropical Storm Gabrielle. Infrared data provides temperature information, and the strongest thunderstorms that reach high into the atmosphere have the coldest cloud top temperatures.
On Sept. 5 at 12:18 a.m. EDT (0418 UTC), the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard Suomi NPP found strongest thunderstorms northeast of the center had cloud top temperatures as cold as minus 70 degrees Fahrenheit (minus 56.6 Celsius). Cloud top temperatures that cold indicate strong storms with the potential to generate heavy rainfall. The southern quadrant of the storm appeared to be almost devoid of clouds because of outside winds blowing from the southwest, or southwesterly vertical wind shear.
In general, wind shear is a measure of how the speed and direction of winds change with altitude. Tropical cyclones are like rotating cylinders of winds. Each level needs to be stacked on top each other vertically in order for the storm to maintain strength or intensify. Wind shear occurs when winds at different levels of the atmosphere push against the rotating cylinder of winds, weakening the rotation by pushing it apart at different levels.
NOAA’s National Hurricane Center (NHC) noted in the discussion on Sept. 5, “Although Gabrielle could experience some intensity fluctuations during the next 24 hours, the cyclone should remain in a rather harsh environment during the next 36 to 48 hours, due to south to southwesterly vertical [wind] shear, some dry air in the middle portions of the atmosphere, and oceanic sea surface temperatures on the order of 25 to 26 Celsius.” Afterward, gradual strengthening is forecast as Gabrielle moves into a more favorable environment.
At 5 a.m. EDT (0900 UTC) NOAA’s National Hurricane Center (NHC) said the center of Tropical Storm Gabrielle was located near latitude 21.9 degrees north and longitude 35.0 degrees west. That’s about 825 miles (1,330 km) west-northwest of the Cabo Verde Islands. Gabrielle is moving toward the northwest near 8 mph (13 kph), and this motion is expected to continue for the next few days with an increase in forward speed. Maximum sustained winds remain near 50 mph (85 kph) with higher gusts. The estimated minimum central pressure is 1002 mb (29.59 inches).
The NHC said, “Little change in strength is forecast during the next couple of days. Afterward, some slow strengthening is expected to begin by this weekend.”
Sep. 05, 2019 – NASA Finds a Few Strong Storms Left in Fernand’s Remnants Over Northeastern Mexico
Tropical Storm Fernand made landfall in northeastern Mexico and began dissipating. However, infrared imagery from NASA’s Aqua satellite shows that there are still fragmented strong storms left in the tropical cyclone’s remnants. Those storms have the potential to generate heavy rainfall and there were warnings posted on Sept. 5.
On Sept. 5 at 4:20 a.m. EDT (0820 UTC) the MODIS instrument that flies aboard NASA’s Aqua satellite showed strongest storms (red) in fragmented thunderstorms in the remnants of Fernand over northeastern Mexico. There, cloud top temperatures were as cold as minus 70 degrees Fahrenheit (minus 56.6 Celsius). Credit: NASA/NRL
NASA’s Aqua satellite used infrared light to analyze the strength of storms in the remnants of Tropical Storm Fernand. Infrared data provides temperature information, and the strongest thunderstorms that reach high into the atmosphere have the coldest cloud top temperatures.
On Sept. 5 at 4:20 a.m. EDT (0820 UTC), the Moderate Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Aqua satellite found strongest thunderstorms had cloud top temperatures as cold as minus 70 degrees Fahrenheit (minus 56.6 Celsius). Cloud top temperatures that cold indicate strong storms with the potential to generate heavy rainfall.
The Servicio Meteorológico Nacional (SMN) is Mexico’s national weather organization. On Sept. 5, SMN issued several warnings for rainfall from Fernand’s remnants. SMN forecasters expect rainfall will total up to 15 inches over northeastern Mexico. In Tamaulipas less than one additional inch is expected. However, in central and southern Nuevo Leon, another 3 to 6 inches is expected. In northern Nuevo Leon and southern Coahuila, 2 to 5 inches are forecasts, and south Texas and the lower Texas coast can expect between 1 to 2 inches, totalling 6 inches in that area.
NOAA’s National Hurricane Center (NHC) issued the final advisory on the remnants of Fernand at 0300 UTC on Sept. 5 (11 p.m. EDT on Sept. 4). At that time, the remnants were centered near 23.0 degrees north latitude and 99.0 degrees west longitude. That’s about 130 miles west-southwest of the mouth of the Rio Grande River. The remnants were moving to the west-northwest and the remnants had maximum sustained winds near 30 knots (34.5 mph/55.5 kph).
Fernand is expected to dissipate over the next day or two.
Sep. 05, 2019 – Update #2 – NASA Measures Dorian’s Heavy Rainfall from Bahamas to Carolinas
Hurricane Dorian continues to generate tremendous amounts of rainfall, and has left over three feet of rain in some areas of the Bahamas and is now lashing the Carolinas. NASA’s IMERG product provided a look at those rainfall totals.
By September 5, Hurricane Dorian had dumped heavy rain on coastal South Carolina. An even greater accumulation of over 10 inches was occurring off shore along the path of Dorian’s inner core. In part because of Hurricane Dorian’s forward motion during the past two days, the recent rainfall totals have remained below the 36-inch accumulation observed when Dorian was stalled over the Bahamas. The graphic shows the distance that tropical-storm force (39 mph) winds extend from Hurricane Dorian’s low-pressure center as reported by the National Hurricane Center. The Saffir-Simpson intensity category is the number following the “H” in the label on the image. Credit: NASA Goddard.
By Thursday morning, September 5, Hurricane Dorian had dumped heavy rain on coastal South Carolina. An even greater accumulation of over 10 inches was occurring off shore along the path of Dorian’s inner core. In part because of Hurricane Dorian’s forward motion during the past two days, the recent rainfall totals have remained below the 36-inch accumulation observed when Dorian was stalled over the Bahamas.
NASA has the ability to estimate the rainfall rates occurring in a storm or how much rain has fallen. Rainfall imagery was generated using the Integrated Multi-satEllite Retrievals for GPM or IMERG product at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. These near-realtime rain estimates come from the NASA IMERG algorithm, which combines observations from a fleet of satellites in the GPM or Global Precipitation Measurement mission constellation of satellites, and is calibrated with measurements from the GPM Core Observatory as well as rain gauge networks around the world. The measurements are done in near-real time, to provide global estimates of precipitation every 30 minutes.
The storm-total rainfall at a particular location varies with the forward speed of the hurricane, with the size of the hurricane’s wind field, and with how vigorous the updrafts are inside the hurricane.
This false-colored infrared image taken from NASA’s Aqua satellite on Sept. 4 at 2:29 p.m. EDT (18:29 UTC) shows Dorian after it re-strengthened into a Category 3 hurricane off the Georgia and South Carolina coast. The image shows a clear eye in the storm. Intense storms capable of generating heavy rainfall appear in purple. Credit: NASA JPL/Heidar Thrastarson
Warnings and Watches on Sept. 5
NOAA’s National Hurricane Center noted the following warnings and watches on Sept. 5. A Storm Surge Warning is in effect from the Savannah River to Poquoson, VA, Pamlico and Albemarle Sounds, Neuse and Pamlico Rivers and Hampton Roads, VA. A Hurricane Warning is in effect from the Savannah River to the North Carolina/Virginia border and for the Pamlico and Albemarle Sounds. A Tropical Storm Warning is in effect from the North Carolina/Virginia border to Chincoteague, VA, and for the Chesapeake Bay from Smith Point southward. A Tropical Storm Watch is in effect for north of Chincoteague VA to Fenwick Island, DE and the Chesapeake Bay from Smith Point to Drum Point, the Tidal Potomac south of Cobb Island, Woods Hole to Sagamore Beach, MA, Nantucket and Martha’s Vineyard, MA.
NHC: Dorian’s Status on Sept. 5
This near visible image taken from NASA’s Aqua satellite on Sept. 4 at 2:29 p.m. EDT (18:29 UTC) shows Dorian after it re-strengthened into a Category 3 hurricane off the Georgia and South Carolina coast. Credit: NASA JPL/Heidar Thrastarson
NHC’s latest bulletin at 8 a.m. EDT (1200 UTC) noted the eye of Hurricane Dorian was located near latitude 32.1 degrees North, longitude 79.3 degrees West. That puts the eye of Dorian about 70 miles (115 km) south-southeast of Charleston, South Carolina. Dorian is now moving toward the north-northeast near 8 mph (13 kph). Maximum sustained winds are near 115 mph (185 km/h) with higher gusts. Dorian is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some fluctuations in intensity are expected this morning, followed by slow weakening through Saturday. However, Dorian is expected to remain a hurricane for the next few days. Hurricane-force winds extend outward up to 60 miles (95 km) from the center, and tropical-storm-force winds extend outward up to 195 miles (315 km). Charleston International Airport recently reported a wind gust of 61 mph (98 kph). The estimated minimum central pressure based on Air Force Reserve Hurricane Hunter data is 959 millibars.
Dorian’s Forecast Path
The National Hurricane Center forecast calls for Dorian to turn toward the northeast by tonight, and a northeastward motion at a faster forward speed is forecast on Friday. On the forecast track, the center of Dorian will continue to move close to the coast of South Carolina today, and then move near or over the coast of North Carolina tonight and Friday. The center should move to the southeast of extreme southeastern New England Friday night and Saturday morning, and approach Nova Scotia later on Saturday.
The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite captured this nighttime composite image as the storm approached the coast at 3:42 a.m. Eastern Time (07:42 UTC) on September 5, 2019. Credit: NASA/NOAA
After devastating the Bahamas and grazing Florida and Georgia, Hurricane Dorian rebounded and raked the coast of South Carolina with strong winds, heavy rains, and a storm surge. Wind, falling trees, and flooding damaged power infrastructure in coastal areas of the southeast U.S.
The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite captured this nighttime composite image as the storm approached the coast at 3:42 a.m. Eastern Time (07:42 UTC) on September 5, 2019. At the time, Dorian packed maximum sustained winds of 115 miles (185 kilometers) per hour and was moving north at 8 miles per hour.
The VIIRS sensor observed thick cloud bands circulating around Dorian’s large eye, the part of the storm with mostly calm weather and the lowest atmospheric pressure. Hurricane eyes average about 20 miles (32 kilometers); the National Hurricane Center reported Dorian’s eye had a diameter of 50 miles (80 kilometers) around the time this image was acquired. Thinner clouds—part of the storm’s higher-level outflow—extended well inland across Georgia, South Carolina, and North Carolina.
The VIIRS image was captured by the sensor’s day-night band, which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe signals such as gas flares, city lights, and reflected moonlight. Infrared observations from VIIRS were used to enhance the visibility of clouds. Optical MODIS satellite data was layered into the image to make it easier to distinguish between ocean and land surfaces.
As of 2 p.m. on September 5, several utility companies and Poweroutages.us were reporting more than 240,000 outages in South Carolina. The hardest hit area was Charleston County, where companies were reporting more than 130,000 outages. Credit: PowerOutage.us
It is not possible to identify the locations of power outages based on the VIIRS night light image alone. However, as of 2 p.m. on September 5, several utility companies and Poweroutages.us were reporting more than 240,000 outages in South Carolina. The hardest hit area was Charleston County, where companies were reporting more than 130,000 outages.
In the coming days, forecasters expect Dorian to move near or over the coast of North Carolina and then toward New England and Nova Scotia.
Sep. 04, 2019 – NASA Catches the Eye of Typhoon Lingling
Typhoon Lingling continues to strengthen in the Northwestern Pacific Ocean and NASA’s Terra satellite imagery revealed the eye is now visible.
On Sept. 4 at 1:20 a.m. EDT (0520 UTC) the MODIS instrument that flies aboard NASA’s Terra satellite showed powerful thunderstorms circling Typhoon Lingling’s visible eye. Credit: NASA/NRL
On Sept. 4 at 1:20 a.m. EDT (0520 UTC) the Moderate Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Terra satellite showed powerful thunderstorms circling Typhoon Lingling’s visible 15 nautical-mile wide eye. The Joint Typhoon Warning Center (JTWC) noted, “Animated enhanced infrared satellite imagery depicts tightly-curved banding wrapping into a ragged eye.” In addition, microwave satellite imagery showed a well-defined microwave eye feature.
At 11 a.m. EDT (1500 UTC), the Joint Typhoon Warning Center or JTWC said that Typhoon Lingling, known locally in the Philippines as Liwayway, had moved away from the Philippines enough that warnings have been dropped.
Lingling was located near 23.0 degrees north latitude and 125.4 degrees east longitude. That is 247 nautical miles southwest of Kadena Air Base, Okinawa, Japan. Lingling was moving to the north-northeast and maximum sustained winds had increased to near 80 knots (75 mph/120.3 kph).
JTWC forecasters said that Lingling is moving north and is expected to intensify to 105 knots (121 mph/194 kph) upon passing between Taiwan and Japan.
Sep. 04, 2019 – NASA Finds Strongest Storms Off-Center in Tropical Storm 14W
NASA’s Terra satellite provided an infrared view and temperature analysis of Tropical Storm 14W’s cloud tops. Terra satellite showed some powerful thunderstorms in the storm were east of the center.
On Sept. 4 at 7:40 a.m. EDT (1130 UTC ).the MODIS instrument that flies aboard NASA’s Terra satellite showed strong storms (yellow) around 14W’s center where cloud top temperatures were as cold as minus 80 degrees Fahrenheit (minus 62.2 Celsius). Credit: NASA/NRL
On Sept. 4 at 7:40 a.m. EDT (1130 UTC), the Moderate Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Terra satellite used infrared light to analyze the strength of storms within the 14W. NASA researches these storms to determine how they rapidly intensify, develop and behave.
The Joint Typhoon Warning Center noted that, “Satellite imagery shows a partially exposed low-level circulation center with an area of deep convection (thunderstorms) offset to the east of the center.” Just as on Sept. 3, the low-level circulation center of the storm remained exposed to outside westerly winds so the strongest thunderstorms continue to be pushed to the eastern side of the storm.
Tropical cyclones are made of up hundreds of thunderstorms, and infrared data can show where the strongest storms are located. They can do that because infrared data provides temperature information, and the strongest thunderstorms that reach highest into the atmosphere have the coldest cloud top temperatures.
MODIS found those strongest storms were around the center of circulation where cloud top temperatures were as cold as minus 80 degrees Fahrenheit (minus 62.2 Celsius). NASA research has found that cloud top temperatures that cold indicate strong storms with the potential to generate heavy rainfall.
The Joint Typhoon Warning Center (JTWC) noted on Sept. 4 at 11 a.m. EDT (1500 UTC), Tropical Storm 14W still had maximum sustained winds near 35 knots (40 mph/65 mph). 14W is far from land areas and is about 1,429 nautical miles southeast of Yokosuka, Japan. 14W is moving to the west.
JTWC said 14W will move west-northwest across the Pacific Ocean and gradually intensify to 90 knots after five days.
Sep. 04, 2019 – GPM Finds a Band of Heavy Rainfall in Tropical Storm Gabrielle
The Global Precipitation Measurement mission or GPM core satellite provided information about the rate in which rain was falling within the Eastern Atlantic Ocean’s latest tropical storm, Gabrielle.
The GPM core satellite passed over Tropical Storm Gabrielle in the eastern North Atlantic Ocean on Sept. 4 at 3:56 a.m. EDT (0756 UTC). GPM found the heaviest rainfall (pink) north and east of the center where it was falling at a rate of over 40 mm (about 1.6 inch) per hour. Lighter rainfall rates (yellow and blue) were measured around that area. Credit: NASA/JAXA/NRL
Tropical Depression 8 formed around 5 p.m. EDT on Tuesday, Sept. 3. Twelve hours later at 5 a.m. EDT on Sept. 4, the storm intensified into a tropical storm and was renamed Gabrielle.
The GPM or Global Precipitation Measurement mission’s core satellite passed over Tropical Storm Gabrielle in the eastern North Atlantic Ocean on Sept. 4 at 3:56 a.m. EDT (0756 UTC). GPM found the heaviest rainfall north and east of the center where it was falling at a rate of over 40 mm (about 1.6 inch) per hour. The National Hurricane Center said of that area, “A large curved band of thunderstorms has become better defined in the northern semicircle.” Lighter rainfall rates were measured around that area.
GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.
NOAA’s National Hurricane Center noted at 11 a.m. EDT (1500 UTC), the center of Tropical Storm Gabrielle was located near latitude 20.5 degrees north and longitude 33.8 degrees west. That’s about 715 miles (1,150 km) west-northwest of the Cabo Verde Islands. Gabrielle is moving toward the northwest near 9 mph (15 kph), and this motion is expected to continue through Saturday, with an increase in forward speed expected late in the week. Maximum sustained winds have increased to near 50 mph (85 kph) with higher gusts. Little change in strength is forecast during the next few days. The estimated minimum central pressure is 1003 millibars.
Hurricane Dorian dropped excessive rainfall on the Bahamas and NASA calculated the rainfall the storm generated.
This image shows NASA IMERG estimated rainfall accumulations for the region of the Bahamas affected by Hurricane Dorian from Aug. 31 to Sept. 4. The imagery shows rainfall exceeded 36 inches in an area that included parts of Grand Bahama Island and Abaco Island. Credit: NASA Goddard
“By Wednesday morning, September 4, the rain accumulation from Hurricane Dorian exceeded 36 inches in an area that included parts of Grand Bahama Island and Abaco Island,” said Owen Kelley, researcher at NASA Goddard. “By that time, the Dorian’s center was north of the Bahamas and was moving further north, approximately parallel to Florida’s east coast.”
NASA Estimating Rainfall
NASA has the ability to peer under the clouds of a tropical cyclone and estimate the rainfall rates occurring in a storm or how much rain has fallen. Rainfall imagery was generated using the Integrated Multi-satEllite Retrievals for GPM or IMERG product at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. These near-realtime rain estimates come from the NASA IMERG algorithm, which combines observations from a fleet of satellites in the GPM or Global Precipitation Measurement mission constellation of satellites, and is calibrated with measurements from the GPM Core Observatory as well as rain gauge networks around the world. The measurements are done in near-real time, to provide global estimates of precipitation every 30 minutes.
The storm-total rainfall at a particular location varies with the forward speed of the hurricane, with the size of the hurricane’s wind field, and with how vigorous the updrafts are inside the hurricane.
During the past day, the maximum sustained surface winds speed (Dorian’s intensity) decreased from category 5 to category 2 on the Saffir-Simpson scale. At the same time, the geographic extent of tropical-storm strength winds increased significantly.
Warnings and Watches on Sept. 4
NOAA’s National Hurricane Center (NHC) posted many warnings and watches as Dorian continues to move north along the U.S. East Coast.
A Storm Surge Warning is in effect for Sebastian Inlet, FL to Surf City, NC. A Storm Surge Watch is in effect from north of Surf City, NC to Poquoson, VA, including Hampton Roads, Pamlico and Albemarle Sounds and the Neuse and Pamlico Rivers.
A Hurricane Warning is in effect for Volusia/Brevard County, FL line to Ponte Vedra Beach, FL and from north of the Savannah River to Surf City, NC. A Hurricane Watch is in effect from north of Ponte Vedra Beach, FL to the Savannah River, from north of Surf City, NC to the North Carolina/Virginia border and for the Albemarle and Pamlico Sounds.
A Tropical Storm Warning is in effect from the Sebastian Inlet, FL to the Volusia/Brevard County, FL line and from north of Ponte Vedra Beach, FL to Savannah River. A Tropical Storm Watch is in effect from the North Carolina/Virginia border to Chincoteague, VA and for Chesapeake Bay from Smith Point southward.
NHC: Dorian’s Status on Sept. 4
At 8 EDT (1200 UTC) on Sept. 4, NHC said the center of Hurricane Dorian was located near latitude 29.5 degrees north and longitude 79.6 degrees west. Dorian is about 95 miles (155 km) east-northeast of Daytona Beach, Florida.
Because hurricane-force winds extend outward up to 60 miles (95 km) from the center, and tropical-storm-force winds extend outward up to 175 miles (280 km), Daytona was experiencing those tropical-storm-force winds at 8 a.m. EDT.
Dorian is moving toward the north-northwest near 8 mph (13 kph), and a northwest or north-northwest motion is expected through this morning. Maximum sustained winds are near 105 mph (165 kph) with higher gusts. Some weakening is expected during the next couple of days. However, Dorian is expected to remain a powerful hurricane during the next few days. The minimum central pressure reported by an Air Force Reserve Unit Hurricane Hunter aircraft is 964 millibars.
NOAA’s Forecasts
NHC said, “A turn toward the north is forecast by this evening, followed by a turn toward the north-northeast on Thursday morning. On this track, the core of Hurricane Dorian will move dangerously close to the Florida east coast and the Georgia coast through tonight. The center of Dorian is forecast to move near or over the coast of South Carolina and North Carolina Thursday through Friday morning.”
Sep. 04, 2019 – NASA Catches Hurricane Juliette Over Mexico’s Socorro Island
Although Hurricane Juliette is no longer a major hurricane in the Eastern Pacific Ocean, NASA’s Aqua satellite revealed there are still powerful thunderstorms around its center and captured an image of the storm over Socorro Island, Mexico.
On Sept. 3, at 5:05 p.m. EDT (2105 UTC) the AIRS instrument aboard NASA’s Aqua satellite analyzed cloud top temperatures of Hurricane Juliette in infrared light. AIRS found coldest cloud top temperatures (purple) of strongest thunderstorms were as cold as or colder than minus 63 degrees Fahrenheit (minus 53 degrees Celsius) around the center and in fragmented bands of thunderstorms stretching from the north to the southeast. Socorro Island, Mexico is visible as a small black dot in the storm’s eastern quadrant (right). Credit: NASA JPL/Heidar Thrastarson
Aqua provided forecasters at the National Hurricane Center with infrared data and cloud top temperature information that indicate Juliette’s rainmaking capabilities that affected Socorro Island.
Cloud top temperatures provide information to forecasters about where the strongest storms are located within a tropical cyclone. The stronger the storms, the higher they extend into the troposphere with colder cloud temperatures.
NASA’s Aqua satellite analyzed the storm on Sept. 3, at 5:05 p.m. EDT (2105 UTC) using the Atmospheric Infrared Sounder or AIRS instrument. AIRS found coldest cloud top temperatures as cold as or colder than minus 63 degrees Fahrenheit (minus 53 degrees Celsius) around the center and in fragmented bands of thunderstorms stretching from the north to the southeast. NASA research has shown that cloud top temperatures that cold indicate strong storms that have the capability to create heavy rain. That heavy rainfall was experienced by the small number of residents on Socorro Island.
Socorro Island is a small volcanic island in the Revillagigedo Islands. It is about 373 miles (600 km) west of Mexico’s west coast. The island is only 51 square miles or 132 square kilometers. It is the largest of the four islands of the Revillagigedo Archipelago.
On Sept. 3, NOAA’s National Hurricane Center’s (NHC) noted at 5 a.m. EDT (0900 UTC), the center of Hurricane Juliette was located near latitude 19.1 degrees north and, longitude 116.4 degrees west. The center is about 495 miles (795 km) west-southwest of the southern tip of Baja California, Mexico. Juliette is moving toward the west-northwest near 6 mph (9 kph), and this general motion is expected during the next few days. Maximum sustained winds are near 110 mph (175 kph) with higher gusts. The estimated minimum central pressure is 966 millibars.
NHC said that additional slow weakening is forecast during the next several days.
