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This page was last loaded at 9:04 pm HST May 23, 2015 (704 GMT May 24, 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 7:30 PM HST

Based on data through 7:00 pm May 23 2015 HST

Water vapor satellite imagery showed an upper low far NE of the main Hawaiian islands with a trough axis extending south to about 100 miles E of the Big Island. A dissipating surface cold front extends in a similar orientation as the upper trough, from 30.0°N 145.3°W to 24.1°N 147.8°W to the Big Island. Layered clouds and lines of cumulus clouds along and ahead of the frontal boundary cover the area between 25.0°N to 30.0°N and 140.0°W to 145.0°W, with highest cloud tops near 42 thousand feet. The trough/front complex is gradually migrating ESE at around 20 mph, except for the remnant portion of the front closest to the Big Island which remains nearly stationary.

Across the aloha state, broken to overcast low clouds still cover most of the Big Island below 8 thousand feet with a few lingering showers over the SE slopes of Mauna Loa from Mountain View to Naalehu. On Maui county, broken to locally overcast low clouds remain across all windward areas, the interior and leeward slopes of Haleakala, and over the interior W Maui mountains. A few showers linger over the E half of Molokai. On Oahu, scattered to locally broken low clouds remained aligned along the Koolau mountains and over portions of the Waianae range. Mainly scattered low clouds prevail elsewhere across Oahu. On Kauai county, locally broken patches of low clouds linger over interior areas around Kokee state park, while mainly scattered low clouds prevail elsewhere.

Broken stratocumulus and cumulus clouds cover most of the area N of the aforementioned cold front and N of 18°N from the Big Island to the 180 line, with cloud motion generally to the S and SW at 10 to 20 mph. Elsewhere, low cloud coverage remains mainly scattered N of 10°N with cloud motion to the N and NE between 140°W and 147°W, turning NW and W from 147°W to 180.

Far S of the islands, clusters of thunderstorms can be observed near the intertropical convergence zone between the equator and 10°N from 140°W to 165°W with cloud tops ranging from 45 to 55 thousand feet.

Hawaii Infrared Satellite image for 0500 UTC

Central Pacific Infrared Satellite image for 0500 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 SAT MAY 23 2015

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

A broad and elongated area of low pressure located about 1450 miles
southeast of the Big Island of Hawaii has remained poorly defined
over the past several hours. Shower activity is currently limited,
and development of this system is becoming less likely. The
disturbance is expected to move slowly west-northwestward to
westward, and it could cross 140W longitude and into the Central
Pacific basin on Sunday.
* Formation chance through 48 hours...medium...60 percent
* Formation chance through 5 days...medium...60 percent

Another broad and elongated area of low pressure located about 1500
miles west-southwest of the southern tip of Baja California is
moving west-northwestward at 10 to 15 mph. Although shower activity
remains disorganized, some slow development of this system could
occur during the next day or so. After that time, however, the
disturbance is expected to move over cooler water and into a region
of less favorable upper-level winds, which should inhibit
* Formation chance through 48 hours...medium...50 percent
* Formation chance through 5 days...medium...50 percent

An area of low pressure could 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
system while it moves west-northwestward to northwestward.
* 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

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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