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This page was last loaded at 1:15 am HST Sep 1, 2014 (1115 GMT Sep 01, 2014)

Central Pacific (140W to 180) xml button

Tropical Outlook Sea Surface Temperatures CPAC Satellite EPAC Satellite Widgets Satellite Message Forecast Discussion

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Issued: Aug 31, 2014 7:00 PM HST

Based on data through 7:00 pm Aug 31 2014 HST

Except for the high upper slopes and summits of Mauna Kea and Mauna Loa, the Big Island is blanketed with low cloudiness this early evening. Broken convective low clouds from daytime heating have also been affecting the higher elevations and interior sections of the other isles, though much of this cloudiness has begun to dissipate as the evening hours progress. Low cloud motion is from the east near 15 mph across the aloha state.

A large area of broken low and middle clouds exists in the waters surrounding the Big Island as of bulletin time, and southeast and south of Maui. More broken low clouds are evident north of Maui county, and west and northwest of Kauai. Skies are otherwise clear to scattered over the adjacent coastal waters.

Aloft above 25 thousand feet, a low is more than 1400 miles west of Kauai and has been heading south at 10 to 15 mph. The low is in the base of a trough whose axis extends northeast from the low through 24°N 180° to 30°N 173°W. The trough has been pushing east to southeast near 15 mph. Isolated thunderstorms associated with the system have been igniting from time to time in the area from 23°N to 29°N between 172°W and 179°E. And near the islands, an upper high remains anchored in their vicinity with a vast area of dry air surrounding the feature.

Convection has become more prominent along the intertropical convergence zone far south of Hawaii compared to 24 hours ago. Most of the showers and thunderstorms have been firing from 04.5°N to 10°N east of 161°W, from 09°N to 12°N between 164°W and 174°W, and from 03°N to 06°N west of 175°W.

Hawaii Infrared Satellite image for 0430 UTC


Western Pacific (West of 180)

Monitored by the:
Joint Typhoon Warning Center
Japan Meteorological Agency

Eastern Pacific (East of 140W) xml button

Eastern Pacific Graphical Tropical Weather Outlook

1100 PM PDT SUN AUG 31 2014

For the eastern North Pacific...east of 140 degrees west longitude:

A trough of low pressure located a few hundred miles south of the
southwestern coast of Mexico is producing a large area of
disorganized showers and thunderstorms. Environmental conditions
are expected to be conducive for gradual development of this
disturbance during the next several days while it moves slowly
northward to northwestward.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 5 days...high...70 percent.

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

State of Hawaii Civil Defense
Oahu Department of Emergency Management
Kauai Civil Defense
Maui Civil Defense
Hawaii (Big Island) Civil Defense

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Saffir-Simpson Scale
  • Tropical Storm - winds 39-73 mph (34-63 kt)
  • Category 1 - winds 74-95 mph (64-82 kt)
  • Category 2 - winds 96-110 mph (83-95 kt)
  • Category 3 - winds 111-129 mph (96-112 kt)
  • Category 4 - winds 130-156 mph (113-136 kt)
  • Category 5 - winds 157 mph and up (137+ kt)
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