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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: Sep 24, 2016 7:30 PM HST

Based on data through 7:00 pm Sep 24 2016 HST

At sunset, afternoon bourne clouds shrouded the lower slopes of the Big Island while clouds are gradually clearing the higher elevations. Weather radar is picking up a few showers over on the lee side of the island east of the airport and near waikoloa. The rest of the island chain has generally fair skies and dry conditions.

Satellite imagery also show a pool of showery low clouds roughly 85 miles northeast of Maui. The area stretches toward the southeast for about 130 miles. This feature is being carried toward the west and southwest by trades clocked at 15 to 20 mph. Otherwise, low clouds are scattered at best within 600 miles north of the islands, and within 300 miles east of the Big Island. A cumulonimbus cloud /cb/ is noted 220 miles west-southwest of Kauai. Cb activity becomes scattered beyond 300 miles south of the Big Island. In fact, cb's are scattered in the region between 15°N and 06°N from 175°W to 140°W.

About 545 miles northwest of Kauai is a front with the coordinates from 30°N 162°W to 29°N 167°W to 27°N 180°W. The front is about 155 mile wide, and has been pushing south at near 10 mph. Midway atoll is in the midst of this frontal band.

Finally, water vapor imagery shows an upper level low at 21°N 179°W or far west of Kauai. There are no significant weather features in the vicinity of the main Hawaiian islands at the higher levels of the atmosphere. The wind flow at 30k feet above the islands is from the southwest.

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 SEP 24 2016

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

A low pressure system located about 850 miles southwest of the
southern tip of Baja California Sur continues to produce a large
area of showers and thunderstorms. Environmental conditions are
forecast to be conducive for development while the system moves
slowly northward, and a tropical depression is expected to form on
* Formation chance through 48 hours...high...90 percent
* Formation chance through 5 days...high...90 percent

Showers and thunderstorms associated with an area of low pressure
located about 1300 miles east-southeast of the Big Island of Hawaii
have changed little during the past several hours. Any development
of this disturbance should be slow to occur for the next couple of
days. After that time, environmental conditions are forecast to
become more conducive for further development of the low. This
system is expected to move west-northwestward during the next couple
of days, and then turn northward as it approaches the Central
Pacific basin.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...medium...50 percent

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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Tropical Cyclones Centers Worldwide
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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