NASA looks at rainfall in Tropical Storm Harvey

August 18, 2017

Tropical Storm Harvey is now moving into the eastern Caribbean Sea. NASA's GPM core satellite examined the soaking rainfall the new tropical storm was generating along its path.

The National Hurricane Center (NHC) upgraded a tropical disturbance that they were monitoring east of the Lesser Antilles to Tropical Storm Harvey on Aug. 17, 2017 at 5:00 p.m. EDT (2100 UTC).

The Global Precipitation Measurement mission or GPM core observatory satellite flew over newly designated Tropical Storm Harvey on Aug. 17 at 6:21 p.m. EDT (2221 UTC). Easterly vertical wind shear was causing the strongest convection to be pushed to the west of the tropical storm's center of circulation.

GPM's Microwave Imager and Dual-Frequency Precipitation Radar (DPR) found that some of these strong convective storms were dropping very heavy rainfall. DPR measured precipitation in one storm falling at a rate of almost 5.8 inches (147 mm) per hour. The GPM mission is a joint mission between NASA and the Japan Aerospace Exploration Agency.

Using GPM's radar (DPR Ku Band) Maryland a 3-D view of the rainfall structure was created at NASA's Goddard Space Flight Center in Greenbelt, Md. The 3-D image showed powerful convective storms west of Harvey's center of circulation reaching altitudes above 9.8 miles (15.8 km).

By 2 p.m. EDT on Aug. 18 Harvey was moving west and away from the Leeward Islands. Tropical Storm Warnings have been dropped for Martinique, Barbados, St. Vincent, the Grenadines and St. Lucia. The Tropical Storm Watch has been dropped for Dominica.

Despite the warnings and watches being dropped, the National Hurricane Center said that Harvey is expected to produce additional rainfall totals of 1 to 2 inches with locally higher amounts across parts of the Leeward and Windward Islands from Guadeloupe southward to Grenada.

At 2 p.m. EDT (1800 UTC), the center of Tropical Storm Harvey was located near 13.2 degrees north latitude and 62.1 degrees west longitude. That's just 60 miles (95 km) west of St. Vincent and 85 miles (135 km) west-southwest of St. Lucia.

Harvey was moving toward the west near 21 mph (33 kph) and this general motion is expected to continue for the next couple of days. Maximum sustained winds are near 40 mph (65 kph) with higher gusts. Slow strengthening is forecast during the next 48 hours.

On the forecast track, the center of Harvey should move into the central Caribbean Sea on Saturday, Aug 19.
For updated forecasts on Tropical Storm Harvey, visit:

By Hal Pierce/Rob Gutro
NASA's Goddard Space Flight Center

NASA/Goddard Space Flight Center

Related Tropical Storm Articles from Brightsurf:

NASA finds powerful storm's around Tropical Storm Cristina's center
A low-pressure area strengthened quickly and became Tropical Storm Cristina in the Eastern Pacific Ocean and infrared imagery from NASA revealed the powerful thunderstorms fueling that intensification.

NASA satellite gives a hello to tropical storm Dolly
During the morning of June 23, the fourth system in the Northern Atlantic Ocean was a subtropical depression.

NASA follows Tropical Storm Nuri's path
An animation of four days of imagery from NASA's Terra satellite showed the progression and landfall of Tropical Storm Nuri.

NASA finds an elongated Phanfone now a tropical storm
NASA-NOAA's Suomi NPP satellite provided a visible image of Phanfone as it continues moving through the South China Sea.

Tropical Storm Krosa gets a comma shape
Tropical Storm Krosa continued on its journey northward in the Northwestern Pacific Ocean when NOAA's NOAA-20 polar orbiting satellite passed overhead and captured a visible image of the strengthening storm in a classic tropical cyclone shape.

Satellite shows Tropical Storm Flossie holding up
Satellite imagery showed that Tropical Storm Flossie's structure didn't change much overnight from July 31 to August 1.

NASA tropical storm Erick strengthening
Infrared imagery from NASA's Aqua satellite revealed a stronger Tropical Storm Erick in the Eastern Pacific Ocean.

GPM satellite provides a 3D look at Tropical Storm Barry
The Global Precipitation Measurement mission or GPM core satellite provided a couple of views of Tropical Storm Barry that showed its cloud heights and rainfall rates.

NASA looks at Tropical Storm Funani's rainfall
Tropical Storm Funani (formerly classified as 12S) continued to affect Rodrigues Island in the South Pacific Ocean when the GPM satellite passed overhead and analyzed its rainfall.

NASA sees Tropical Storm Man-yi approaching typhoon strength Tropical Storm Man-Yi con
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.

Read More: Tropical Storm News and Tropical Storm Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to