News Column

NASA sees heavy rain in Hurricane Iselle as it heads toward Hawaii

August 20, 2014

By a News Reporter-Staff News Editor at Defense & Aerospace Week -- NASA'sTropical Rainfall Measuring Mission satellite known as TRMM flew directly over the eye of powerful Hurricane Iselle and found extremely heavy rainfall rates occurring there.

On August 4, 2014 at 1037 UTC (6:37 a.m. EDT) when TRMM passed over the storm, Iselle had winds of about 120 knots (about 138 mph) at that time making it a dangerous category four hurricane on the Saffir-Simpson hurricane wind scale. Rainfall from TRMM's Microwave Imager (TMI) and Precipitation Radar (PR) instruments was overlaid on an enhanced infrared image from NOAA's GOES-West satellite that showed cloud extent. The composite image showed the diameter of the storm and the rate in which rain was falling within it. The TRMM PR saw rain falling at a rate of almost 182 mm (about 7.2 inches) per hour in Iselle's eye wall.

TRMM data was also used to create a 3-D image of the storm to help forecasters see cloud heights. At NASA's Goddard Space Flight Center in Greenbelt, Maryland, a 3-D image was produced using radar reflectivity values from TRMM's Precipitation Radar (PR) instrument. The 3-D image showed storms in Iselle's eye wall reaching from 13km (8 miles) to the surface of the ocean below.

Keywords for this news article include: Aerospace, NASA/Goddard Space Flight Center, Government Agencies Offices and Entities.

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Source: Defense & Aerospace Week

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