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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: Jul 28, 2016 2:30 PM HST

Based on data through 2:00 pm Jul 28 2016 HST

Visible satellite imagery shows a large field of stable stratocumulus /sc/ clouds moving over the main Hawaiian islands from the east, carried westward by a sturdy trade wind flow. As is typical for this type of shallow cloud type, cloud cover over water has decreased since this morning in response to diurnal warming of the cloud tops. Meanwhile, over the islands, cloud cover has also decreased in most areas since this morning, and mostly sunny and dry conditions prevail around the state this afternoon. Low clouds near the islands continue to move toward the west at speeds between 20 and 25 mph, except through the Alenuihaha channel, where low cloud motions are accelerated to near 30 mph.

A close-up look of the islands reveals mostly sunny skies over Kauai and Niihau and adjacent waters, although few to scattered low clouds are over interior portions of Kauai. The wave clouds observed over Oahu and near shore leeward waters this morning have since dissipated, and most coastal areas on the island are under mostly sunny skies. A few low clouds are over near shore waters of the north shore, with scattered to broken low clouds over and just west of the Koolau range. Cloud cover on Molokai has decreased since this morning, with sunny skies prevailing island wide, aside from small sc and cumulus /cu/ over the northeast slopes. A similar pattern has developed on the other islands of Maui county, with nearly cloud-free skies noted over Lanai, Kahoolawe and Maui. The exceptions on Maui include scattered to locally broken low clouds that are banked up along the lower windward slopes of the windward west Maui mountains and along windward Haleakala.

Water vapor imagery shows that an area of light winds aloft is over the islands, with ridges aloft located northeast and southwest of the islands, and troughs located northwest and southeast of the islands. The trough to the east and southeast features a westward-moving closed low aloft centered near 23°N 145°W, or about 850 miles east of Oahu. This low aloft has a weak surface reflection, with a poorly-defined low-level surface trough along 144°W from about 20°N to 26°N.

Scattered moderate thunderstorms are located over the northwestern portion of the Papahanaumokuakea marine national monument, just southeast of Midway atoll. These thunderstorms are developing in response to a weak, northeast to southwest oriented, surface trough which contains the remnants of post- tropical cyclone Darby as it interacts with a weak trough aloft.


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 PM PDT THU JUL 28 2016

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

The National Hurricane Center has issued the final advisory on
Post-Tropical Cyclone Frank, located about 1000 miles west of the
southern tip of the Baja California peninsula.

A broad and elongated area of low pressure located about 700 miles
south of the southern tip of the Baja California peninsula is
producing disorganized showers and a few thunderstorms. Upper-level
winds are forecast to become more conducive for development during
the next day or two, and a tropical depression is likely to form
over the weekend or early next week while the low moves west-
northwestward at 10 to 15 mph.
* Formation chance through 48 hours...medium...50 percent
* Formation chance through 5 days...high...80 percent

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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

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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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