Tag: Man-yi 2018

November 27, 2018 – NASA-NOAA Satellite Finds Man-yi Becoming Extra-tropical

Tropical Cyclone Man-yi appeared elongated on satellite imagery as it continued moving in a northeasterly direction in the Northwestern Pacific Ocean. Man-yi was being affected by wind shear and was becoming an extra-tropical cyclone.

On Nov. 27, the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA’s Suomi NPP satellite analyzed Tropical Cyclone Man-yi. A visible image showed that wind shear was affecting the storm and it was elongated from southwest to northeast.

In general, wind shear is a measure of how the speed and direction of winds change with altitude. Winds at different levels of the atmosphere push against the cylindrical circulation center and weaken the storm’s rotation.

On Nov. 27, the Joint Typhoon Warning Center issued the final warning on Man-yi.

At 10 a.m. EDT (1500 UTC) Man-yi’s maximum sustained winds were near 30 knots (34.5 mph/55.5 kph). It was located near 24.1 degrees north latitude and 133.8 degrees east longitude. That’s approximately 351 nautical miles east-southeast of Kadena Air Base, Okinawa, Japan. Man-yi was moving northeastward.

Man-yi already started the process into an extra-tropical transition. That happens when a tropical cyclone has lost its “tropical” characteristics. The National Hurricane Center defines “extra-tropical” as a transition that implies both poleward displacement (meaning it moves toward the north or south pole) of the cyclone and the conversion of the cyclone’s primary energy source from the release of latent heat of condensation to baroclinic (the temperature contrast between warm and cold air masses) processes. It is important to note that cyclones can become extratropical and still retain winds of hurricane or tropical storm force.

On Nov.27, Man-yi is expected to complete extra-tropical transitioning in the next day.

By Rob Gutro
NASA’s Goddard Space Flight Center

November 26, 2018 – NASA’s GPM Shows Small Area of Heavy Rain in Tropical Storm Man-yi

Once a typhoon, Man-yi has weakened to a tropical storm as it continues to track through the Northwestern Pacific Ocean, far to the east of Taiwan. The GPM core satellite provided a look at the rain rates throughout the storm and found heaviest rain displaced to the northeast of the center.

The Global Precipitation Measurement mission or GPM core observatory satellite is a joint satellite mission between NASA and the Japan Aerospace Exploration Agency called JAXA. GPM provided an analysis of rainfall within Man-yi on Nov. 26 at 11:41 a.m. EST (1641). Microwave Imager (GMI) instruments revealed heaviest estimated precipitation was falling at a rate of greater than 30 mm (1.2 inches) per hour northeast of the center of circulation.

That heaviest rainfall was displaced from the center because of moderate vertical wind shear pushing it from the center. In general, wind shear is a measure of how the speed and direction of winds change with altitude. Wind shear can tear a tropical cyclone apart or weaken it.

At 10 a.m. EST (1500 UTC) on Nov. 26, Man-yi was a weak tropical storm with maximum sustained winds near 35 knots (40 mph/74 kph). It was centered near 21.4 north latitude and 132.1 east longitude, about 406 nautical miles southeast of Kadena Air Base, Okinawa Island, Japan. Man-yi has tracked north-northwestward.

Man-yi is expected to maintain strength for another day and then be absorbed by the mid-latitude westerlies (winds) and begin extra-tropical transition. Man-yi is expected to be fully transitioned into an extra-tropical cyclone by Nov. 28.

That means that a tropical cyclone has lost its “tropical” characteristics. The National Hurricane Center defines “extra-tropical” as a transition that implies both poleward displacement (meaning it moves toward the north or south pole) of the cyclone and the conversion of the cyclone’s primary energy source from the release of latent heat of condensation to baroclinic (the temperature contrast between warm and cold air masses) processes. It is important to note that cyclones can become extratropical and still retain winds of hurricane or tropical storm force.

By Rob Gutro
NASA’s Goddard Space Flight Center

November 23, 2018 – NASA Finds a Cloud-filled Eye in Typhoon Man-yi

Visible imagery from NASA’s Aqua satellite revealed Typhoon Man-yi’s eye had become cloud-filled.

On Nov. 23 the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA’s Aqua satellite provided a visible image of Typhoon Many-yi in the Northwestern Pacific Ocean. The MODIS image showed that clouds had filled in over the eye, and the storm had become elongated. The elongation indicates that the storm is being affected by outside winds and will likely weaken.

The Joint Typhoon Warning Center or JTWC noted at 10 a.m. EST (1500 UTC) that Man-yi had maximum sustained winds near 85 knots (98 mph/157 kph). It was centered near 16.9 degrees north latitude and 135.3 degrees east longitude. That’s 729 nautical miles southeast of Kadena Air Base, Okinawa, Japan. Man-yi was moving north-northwest.

JTWC has forecast Man-yi to move northwest and begin weakening. It is expected to make a sharp turn to the northeast. It is expected to pass east of Okinawa Island, Japan.

By Rob Gutro
NASA’s Goddard Space Flight Center

November 21, 2018 – NASA Sees Tropical Storm Man-yi Approaching Typhoon Strength

Tropical Storm Man-Yi continued to strengthen in the Northwestern Pacific Ocean as NASA-NOAA’s Suomi NPP satellite provided a visible image of the storm. Warnings are in effect through the Federated States of Micronesia at the storm continues to affect the region.

The National Weather Service (NWS) in Tiyan, Guam noted several watches and warnings in effect. A Tropical Storm Watch remains in effect for Fais and Ulithi in Yap State. A Typhoon Watch remains in effect for Faraulep in Yap State. A Tropical Storm Warning remains in effect for Satawal and Faraulep in Yap State…and for Guam and Rota in the Mariana Islands.

The Suomi NPP satellite passed over Man-yi on Nov. 21 and the VIIRS instrument provided a visible image. The VIIRS image showed Man-yi was a large and strong tropical storm over the Federated States of Micronesia. Tropical storm force winds extend outward from the center up to 115 miles making the storm about 230 miles in diameter.

At 7 a.m. EST (10 p.m. CHST local time/1200 UTC) the center of Tropical Storm Man-yi was located near latitude 8.9 degrees north and longitude 146.5 degrees east. Man-yi is moving west-northwest at 23 mph. It is expected to maintain this general course and speed over the next 24 hours. Maximum sustained winds remain at 65 mph.

NWS said “Man-yi will track east of Faraulep tonight…then pass about 200 miles southwest of Guam Thursday afternoon…and about 150 miles northeast of Ulithi and Fais Thursday evening, Nov. 22.”

Man-yi is forecast to intensify through Thursday possibly becoming a typhoon as it moves in a northwesterly direction. Maximum sustained winds are forecast to peak near 110 mph on Friday, Nov. 23.

For updated forecasts, visit: http://www.prh.noaa.gov/guam/cyclone.php

By Rob Gutro 
NASA’s Goddard Space Flight Center

November 20, 2018 – NASA Sees Tropical Depression Man-yi, Warnings Triggered

Tropical depression Man-yi for med in the Northwestern Pacific Ocean and NASA captured an image of the storm. Yap state is already under watches and warnings.

The National Weather Service (NWS) in Tiyan, Guam has issued a typhoon watch and Tropical Storm warning on Nov. 20. A Typhoon Watch remains in effect for Faraulep in Yap State and for Puluwat in Chuuk State. A Tropical Storm Warning is in effect for Chuuk Lagoon, Lukunor, Losap, Fananu, Ulul, and Puluwat in Chuuk State and for Satawal in Yap State. A Tropical Storm Watch remains in effect for Guam and Rota.

Tropical Depression Man-yi formed on Nov. 20 and NASA-NOAA’s Suomi NPP satellite passed overhead. The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA’s Suomi NPP satellite provided a visible image of the storm. Man-yi is a large area of low pressure. The image showed powerful thunderstorms around the center of circulation and a large, thick band of thunderstorms feeding into the center from the west were bringing gusty winds and rainfall to the Federated States of Micronesia.

On Nov. 20 at 7 a.m. EST (1200 UTC/10 p.m. CHST local time), the center of Tropical Depression Man-yi was located near Latitude 4.8 degrees north and longitude 154.2 degrees east. Man-yi is moving west at 10 mph. It is expected to make a slight turn toward the west-northwest with an increase in forward speed through Thursday. NWS in Guam said that maximum sustained winds remain at 30 mph. Man-yi is forecast to intensify through Friday possibly becoming a tropical storm Wednesday.

For updated forecasts, visit: http://www.prh.noaa.gov/guam/cyclone.php

By Rob Gutro
NASA’s Goddard Space Flight Center