Guillermo maintains strength, continues to move northwest

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As of 11 a.m. Tuesday, Tropical Storm Guillermo has maintained 70 mph winds with a forecast track farther north of the islands.

Little change in strength is expected through Wednesday morning, with slow but steady weakening anticipated thereafter. Tropical storm force winds extend outward up to 175 miles from the center.

A tropical storm watch, as well as a flash flood watch, is in effect for Hawaii Island and the island of Maui.

Forecasters say it is important not to focus on the exact forecast track. Forecast movement, direction and speed are only estimates, and even small shifts in the track can mean major differences in where the worst conditions will occur. Damaging effects can extend far from the center.

While the forecast track keeps the center of Guillermo northeast of the main Hawaiian islands, a significant deviation to the left of the track would have the potential to bring tropical storm conditions to the Big Island or Maui County.

Summary of 11 a.m. information

  • Location: 20.2N 149.0W
  • About 396 miles E of Hilo, 580 miles ESE of Honolulu
  • Maximum sustained winds: 70 mph
  • Present movement: NW at 10 mph
  • Minimum central pressure: 990 mb

The storm is about 396 miles east-southeast of Hilo, and 580 miles east-southeast of Honolulu, with maximum sustained winds at 70 mph with higher gusts.

The storm system is moving northwest at 10 mph. The center of Guillermo is expected to pass approximately 215 miles northeast of Hawaii Island on Wednesday and about 165 miles northeast of Maui Wednesday night.

The threat of sporadic heavy rains will linger while the storm moves parallel to the islands, about one to three inches of rain could fall for most areas, with more near the mountains.

Large surf could spread from east to west over the islands this mid-week for east-facing shores. As the storm moves closer to Hawaii, the National Weather Service may issue a high surf advisory for east facing shores of most islands.

It is still too soon to determine which islands will experience the greatest impacts from Guillermo.

An east swell from tropical storm Guillermo will remain moderate in size through today, rise rapidly Wednesday, then taper off quickly Thursday.

The “hurricane hunters” of the U.S. Air Force 53rd Weather Reconnaissance Squadron conducted its first reconnaissance early Sunday at 4 a.m. as they flew through the storm. Crews dropped special sensors known as dropsondes into the storm to measure wind speeds, pressure and temperature.

The squadron will do observations every 12 hours, and as Guillermo gets closer to Hawaii, a plane will leave every nine hours.

guillermo aug. 4 11am


NOAA Pacific Radar



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