Guillermo now a tropical storm, continues to weaken

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Tropical Storm Guillermo continues to steadily weaken as it moves west-northwest toward the main Hawaiian Islands, according to the Central Pacific Hurricane Center.

The latest models bring the storm near or possibly directly over the islands on Wednesday and Thursday. Heavy rainfall and gusty winds between 35-40 mph are forecast for those days.

As of 11 a.m. Monday, the storm is about 565 miles east-southeast of Hilo, and 775 miles east-southeast of Honolulu with maximum sustained winds at 65 mph with higher gusts.

The storm system is moving northwest at 12 mph. The center of Guillermo is expected to pass approximately 150 miles northeast of Hawaii Island on Wednesday. Tropical storm force winds extend outward up to 140 miles from the center.

As the storm moves closer to Hawaii, the National Weather Service may issued 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.

Large swells traveling ahead of Guillermo will spread from east to west over the Hawaiian Islands through Monday. Surf will steadily build along east-facing shores and will likely become large and potentially life-threatening starting on Monday.

Summary of 11 a.m. information

  • Location: 17.5N 146.8W
  • About 565 miles ESE of Hilo, 770 miles ESE of Honolulu
  • Maximum sustained winds: 65 mph
  • Present movement: NW at 12 mph
  • Minimum central pressure: 991 mb

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 round-the-clock observations every 12 hours, and as Guillermo gets closer to Hawaii, a plane will leave every nine hours.

NOAA Pacific Radar

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