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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: May 28, 2016 8:30 AM HST

Based on data through 8:00 am May 28 2016 HST

Water vapor imagery reveals an upper level trough with its axis running from 40°N 157°W to 27°N 159°W to 18°N 174°W. The upper trough as well as ample moisture is helping to support a surface front from 40°N 149°W to 26°N 160°W. North of 30°N, the layered cloud band associated with the front is approximately 250 miles wide with tops to 40 thousand feet. Between 30°N and 26°N, the frontal band tapers to a 125 mile wide band near 30°N to a 50 mile wide band near 26°N. Clouds tops also gradually lessen, from 40 thousand feet near 30°N to 20 thousand feet near 26°N. South of 26°N, the front transitions to a nearly stationary surface trough, running from 26°N 160°W to 22°N 163°W.

Low level satellite derived winds place the center of a surface high near 37°N 137°W with its associated ridge extending southwest to 24°N 157°W, or about 200 miles north of Oahu. East of 150°W, broken stratocumulus /sc/ are generally moving to the west between 15 and 25 mph. Between the area north of the main Hawaiian island, the front, and 150°W, overall cloud motion is to the northwest and north. Elsewhere in the area, scattered sc and cumulus /cu/ are moving to the west between 15 and 25 mph.

Over the main Hawaiian islands this morning, low level showery clouds linger along the north and east slopes of Oahu Molokai and Big Island. On Maui and Kauai, low clouds are lingering along the southeast shores and slopes. Other areas on the Big Island have broken clouds, but keeping the summits clear. The remaining areas on the smaller island have few level clouds.

A long swath of cirrus /ci/ is being pulled north and eastward from scattered thunderstorm convection along the inter-tropical convergence zone /itcz/ found south of 10°N. The 400 mile wide band of CI runs from 10°N 163°W to 19°N 140°W, passing over the Big Island.

Hawaii Visible Satellite image for 1800 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 AM PDT SAT MAY 28 2016

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

Tropical cyclone formation is not expected during the next 5 days.

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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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 111-130 mph (96-113 kt)
  • Category 4 - winds 131-155 mph (114-135 kt)
  • Category 5 - winds 156 mph and up (135+ kt)
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