NASA looks at Tropical Storm Guillermo closing in on Hawaii

August 05, 2015

NASA's Terra satellite and RapidScat provided forecasters with information about Tropical Storm Guillermo, revealing that the strongest winds were on the northern and eastern sides.

A tropical storm watch is in effect for Hawaii county, and Maui county, including the islands of Maui, Molokai, Lanai and Kahoolawe. Those areas can expect rainfall totals of 1 to 3 inches, locally up 7 inches in higher terrain. In addition, east facing shores of the Hawaiian Islands will see large surf through the rest of the week.

From its perch on the International Space Station, the RapidScat instrument gathered surface wind data on the Central Pacific Ocean's Tropical Storm Guillermo on August 4 at 9 a.m. EDT as it neared Hawaii. RapidScat data showed the strongest winds on the northern and eastern sides, while winds on the western side of the storm were much weaker. Strongest sustained winds were between 24 and 27 meters per second (53.6 mph/ 86.4 kph and 60.4/97.2 kph). Tropical storm force winds extend outward up to 185 miles (295 km) from the center, mainly to the north of the center.

On August 4 at 20:50 UTC 4:50 p.m. EDT NASA's Terra satellite captured a visible image of Tropical Storm Guillermo. In the image thunderstorms surround the center of the circulation but area also pushed to the northeast of the center from wind shear. RapidScat data confirmed that the northeastern quadrant is where the strongest winds were occurring.

At 11 a.m. EDT (5 a.m. HST/1500 UTC) on August 5, the center of tropical storm Guillermo was located near latitude 20.5 North and longitude 151.2 West. It was about 260 miles (415 km) east-northeast of Hilo, Hawaii. Maximum sustained winds are near 60 mph (95 kph) but the National Hurricane Center expects steady weakening over the next couple of days.

Guillermo is moving toward the west-northwest near 9 mph (15 kph) and is expected to continue in that direction. The center of Guillermo is expected to pass about 160 miles north-northeast of the big island late tonight, August 5, and 90 miles north-northeast of Maui on Thursday, August 6. The estimated minimum central pressure is 999 millibars.

NOAA's Central Pacific Hurricane Center forecast calls for Guillermo to move northwest over the next several days, moving almost parallel the Hawaiian Islands. For updated forecasts, visit: http://www.prh.noaa.gov/hnl/cphc/

The storm is moving into an area of increasing vertical wind shear and is expected to weaken to a depression by August 6.
-end-


NASA/Goddard Space Flight Center

Related Wind Shear Articles from Brightsurf:

NASA imagery reveals Tropical Storm Gamma battered by wind shear
NASA's Terra satellite obtained visible imagery of Tropical Storm Gamma being battered by outside winds in the south central Gulf of Mexico.

NASA finds wind shear displacing Lowell's strongest storms
NASA's Aqua satellite provided an infrared view of Tropical Storm Lowell that revealed the effects of outside winds battering the storm.

NASA finds Dolphin swimming against wind shear
NASA's Terra satellite provided a visible image of a slightly elongated Tropical Storm Dolphin as it battled wind shear upon its approach to east central Japan.

NASA finds wind shear not letting up on Tropical Storm Vicky
NASA's Terra satellite obtained visible imagery of Tropical Storm Vicky as it continued moving through the eastern North Atlantic Ocean fighting strong wind shear.

NASA finds Tropical Storm Rene less affected by wind shear
NASA's Terra satellite obtained visible imagery of Tropical Storm Rene is it continued moving north though the central North Atlantic Ocean.

NASA's Aqua Satellite finds wind shear not letting up on Omar  
Tropical Depression Omar is one stubborn storm. Since it developed early in the week, it was being affected by wind shear.

NASA's Terra Satellite provides clear picture of wind shear battering Omar
NASA's Terra satellite provided a visible image that showed Tropical Storm Omar had weakened to a depression as it continued to be battered by strong upper level winds.

NASA sees wind shear still battering tropical storm Iselle
NASA infrared imagery shows wind shear continued to batter Tropical Storm Iselle in the Eastern Pacific Ocean for the second day.

NASA finds new Tropical Storm Iselle already battling wind shear
NASA infrared imagery shows that newly formed Tropical Storm Iselle is already battling for its life under wind shear.

NASA finds wind shear affecting Tropical Storm Josephine
NASA-NOAA's Suomi NPP satellite provided forecasters with a visible image of Tropical Storm Josephine east of the Lesser Antilles island chain.

Read More: Wind Shear News and Wind Shear Current Events
Brightsurf.com 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 Amazon.com.