Hurricane Guillermo continues to move west-northwest, beginning to weaken

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Hurricane Guillermo continues to move toward the west-northwest and is beginning to weaken, according to the Central Pacific Hurricane Center.

As of 11 a.m. Sunday, the storm is located 790 miles east-southeast of Hilo with maximum sustained winds now at 90 mph (previously at 105 mph) with higher gusts.

A turn toward the northwest is expected Sunday with a continued motion toward the northwest expected on Monday.

Steady weakening is expected during the next couple of days. Increasing northwesterly upper level winds have begun to affect Guillermo and its satellite presentation has become increasingly ragged Sunday morning.

Models Saturday showed the eye of Guillermo passing to the north of the islands, but the effects will still be felt as early as Tuesday night on Hawaii Island and lasting through Friday over the smaller islands as the storm moves west.

Heavy rainfall and gusty winds between 35 and 40 mph are forecast for Wednesday and Thursday.

Summary of 11 a.m. information

  • Location: 15.2N 144.1W
  • About 790 miles ESE of Hilo
  • Maximum sustained winds: 90 mph
  • Present movement: WNW at 10 mph
  • Minimum central pressure: 978 mb

Large swells traveling ahead of Hurricane 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.

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

NOAA Pacific Radar



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