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This page was last loaded at 4:54 am HST May 23, 2015 (1454 GMT May 23, 2015)

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 23, 2015 2:30 AM HST

Based on data through 2:00 am May 23 2015 HST

Water vapor satellite imagery shows an upper level low far NE of the main Hawaiian islands, with an associated trough axis extending from 30.0°N 150.0°W to 22.2°N 145.6°W. A sfc cold front boundary stretches from 30.0°N 147.9°W to 22.7°N 152.8°W to Maui county. Layered clouds and lines of stratocumulus clouds are pushing ENE ahead and along the front, covering the area between 25.0°N to 30.0°N and 140.0°W to 148.2°W. Highest cloud tops in these layered clouds are near 47 thousand feet.

Closer to the main Hawaiian islands, broken low clouds still cover most of the Big Island below 8 thousand feet with a few showers lingering over the leeward slopes and coastal locations from Kona village resort to Milolii. A line of showers, associated with the aforementioned front, is slowly approaching Upolu Airport from the N. On Maui county, broken to overcast low clouds cover Maui below 7 thousand feet, Lanai and most of Molokai. Showers remain basically anchored across windward areas of Maui and the E half of Molokai. On Oahu, the thick low clouds are slowly thinning out, but still broken to overcast coverage lingers across windward areas and along the Koolau mountains. On Kauai county, broken low clouds cover the N half of Kauai.

Mainly broken cumulus and stratocumulus clouds cover the area N of the sfc cold front and N of 20°N between 147°W to 180°W with cloud motion generally to the s/sw at about 15 mph. Coverage becomes mainly scattered elsewhere N of 10°N with cloud motion to the n/ne between 140°W to 151°W, and turning to the NW and W from 151°W to 180.

Far S of the islands, small clusters of thunderstorms can be observed near the intertropical convergence zone between 05°N to 10°N and 140°W to 150°W with cloud tops ranging from 52 thousand feet.

Hawaii Infrared Satellite image for 1200 UTC

Central Pacific Infrared Satellite image for 1200 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

500 AM PDT SAT MAY 23 2015

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

An elongated area of low pressure located about 1400 miles
southwest of the southern tip of Baja California is producing a
large area of showers and thunderstorms. While this system has
changed little in organization during the past several hours,
environmental conditions appear conducive for gradual development
during the next few days while it moves west-northwestward at 10 to
15 mph.
* Formation chance through 48 hours...medium...60 percent
* Formation chance through 5 days...high...80 percent

Shower activity associated with an area of low pressure located
about 1600 miles southeast of the Big Island of Hawaii has
also changed little in organization during the past several hours.
Some development of this system is possible during the next day or
so while the low remains stationary. After that time, development
is not expected due to the proximity of the disturbance to its
* Formation chance through 48 hours...medium...50 percent
* Formation chance through 5 days...medium...50 percent

An area of low pressure may form early next week several hundred
miles south of the coast of Mexico. Environmental conditions are
expected to be conducive for subsequent slow development of the
* Formation chance through 48 hours...low...near 0 percent
* Formation chance through 5 days...low...20 percent

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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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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