jeudi 1 octobre 2015

Satellites Show Joaquin Become a Category 4 Hurricane














NOAA & NASA - GOES East Mission logo / NASA - Suomi-NPP Mission logo.

Oct. 1, 2015

Joaquin - Atlantic Ocean

Hurricane Joaquin had become a Category 4 hurricane on the Saffir-Simpson Wind Scale by 2 p.m. EDT on Oct. 1. At NASA, satellite imagery from NOAA's GOES-East satellite was compiled into an animation that showed the hurricane strengthening. Earlier in the day, NASA-NOAA's Suomi NPP satellite saw powerful thunderstorms within, indicating further strengthening.

Satellite Movie Shows Hurricane Joaquin in the Bahamas

Animation above: This animation of images captured from September 29 to October 1 from NOAA's GOES-East satellite shows Hurricane Joaquin become a major hurricane in the Bahamas. TRT: 00:32. Animation Credits: NASA/NOAA GOES Project.

The GOES-East satellite is managed by NOAA, and at NASA's GOES Project at the NASA Goddard Space Flight Center in Greenbelt, Maryland, imagery from GOES-East we compiled into an animation. The infrared and visible imagery from Sept. 29 to Oct. 1 from showed Hurricane Joaquin become a major hurricane in the Bahamas.

Earlier in the morning, NASA-NOAA's Suomi NPP satellite passed over Joaquin at 06:10 UTC (2:10 a.m. EDT) as it was strengthening from a Category 2 to a Category 3 hurricane. The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard captured an infrared image that showed cloud top temperatures colder than -63F/-53C, indicative of powerful storms within the hurricane. NASA research has shown that storms with cloud tops that high (and that stretch that high into the troposphere) have the capability to generate heavy rain.

NASA-NOAA GOES-East satellite

On Oct. 1, a Hurricane Warning was in effect for the Central Bahamas, Northwestern Bahamas including the Abacos, Berry Islands, Eleuthera, Grand Bahama Island, and New Providence, The Acklins, Crooked Island, and Mayaguana in the southeastern Bahamas. A Hurricane Watch was in effect for Bimini and Andros Island, and a Tropical Storm Warning was in effect for the remainder of the southeastern Bahamas excluding the Turks and Caicos Islands and Andros Island.


Image above: NASA-NOAA's Suomi NPP satellite passed over Joaquin at 06:10 UTC (2:10 a.m. EDT) on Oct. 1 as it was strengthening from a Category 2 to a Category 3 hurricane. Imagery showed cloud top temperatures colder than -63F/-53C (yellow). Image Credits: NRL/NASA/NOAA.

At 2 p.m. EDT (1800 UTC), the center of Hurricane Joaquin was located near latitude 23.0 North, longitude 74.2 West.  Joaquin was moving generally southwestward at about 6 mph (9 kph), and the National Hurricane Center forecast a turn toward the northwest and north on Friday, Oct. 2. On the forecast track, the center of Joaquin will move near or over portions of the central Bahamas today and tonight and pass near or over portions of the northwestern Bahamas on Friday, Oct. 2.

Reports from an Air Force Reserve Hurricane Hunter aircraft indicated that maximum sustained winds have increased to near 130 mph (210 kph) with higher gusts.  Joaquin is now a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale.  Some additional strengthening is possible during the next 24 hours, with some fluctuations in intensity possible Friday night and Saturday.

NASA-NOAA Suomi NPP satellite

Hurricane force winds extend outward up to 45 miles (75 km) from the center and tropical storm force winds extend outward up to 140 miles (220 km).

The latest minimum central pressure extrapolated from Hurricane Hunter aircraft data is 936 millibars. For effects on the Bahamas, updates to forecasts, watches and warnings, visit the National Hurricane Center website: http://www.nhc.noaa.gov.

The NHC updated forecast takes Joaquin on a more northerly track from Saturday, Oct. 3 through Tuesday, October 6 toward Long Island, New York. Tracks and forecasts are subject to change.

Related links:

NOAA's GOES-East satellite: http://www.ssd.noaa.gov/goes/east/

NASA-NOAA's Suomi NPP satellite: http://npp.gsfc.nasa.gov/

Images, Animation (mentioned), Text, Credits: NASA's Goddard Space Flight Center/NOAA/Rob Gutro.

Greetings, Orbiter.ch

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