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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 31, 2014 7:00 PM HST

Based on data through 7:00 pm Jul 31 2014 HST

Low ceilings, and any accompanying showers, are favoring windward and mauka sections on the individual isles this early evening. This is especially the case on the Big Island, where high clouds moving from the south have also been generating ceilings over its eastern two thirds. Also on the Big Island, the leeward slopes of Mauna Kea and Mauna Loa in south Kohala and Kona have been blanketed by lower cloudiness. Leeward areas on the other isles are mainly clear to partly cloudy as of bulletin time. Low cloud movement is from the east to east-northeast between 15 and 20 mph across the aloha state.

Over the adjacent coastal waters, low cloudiness is predominantly scattered. However, patches of scattered to broken showery low clouds exist north clockwise through east of the state and are heading west on the prevailing trade flow. A much larger area of broken low clouds is in the offshore waters east of the Big Island and pushing west toward the state.

Far northwest of the state is a weakening front near Midway atoll. Isolated thunderstorms have been occurring north of 28°N between 169°W and 178°W, and in the area just southwest from Midway.

Remnant low Genevieve is approximately 500 miles south-southeast of South Point on the Big Island and has been pushing west at less than 10 mph. Isolated thunderstorms have been occasionally firing to the west and southwest of the circulation center. Another tropical disturbance is around 850 miles southwest of Honolulu and has been moving west slowly. Convection associated with this feature has been more intense, with some cells topping out above 50 thousand feet. Most of the showers and thunderstorms with the system have been igniting from 10°N to 12°N between 163°W and 166°W.

Hawaii Infrared Satellite image for 0430 UTC


Western Pacific (West of 180)

Monitored by the:
Joint Typhoon Warning Center
Japan Meteorological Agency

Eastern Pacific (East of 140W) xml button

Active Systems

xml button  Tropical Storm ISELLE Forecast Advisory Number 3
Issued at 0900 UTC FRI AUG 01 2014

Eastern Pacific Graphical Tropical Weather Outlook

500 AM PDT FRI AUG 1 2014

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

The National Hurricane Center is issuing advisories on Tropical
Storm Iselle, located more than a thousand miles west-southwest of
the southern tip of the Baja California peninsula.

A tropical wave is producing disorganized showers and thunderstorms
several hundred miles south-southwest of Manzanillo, Mexico.
Environmental conditions are conducive for gradual development of
this system during the next several days while it moves westward at
10 mph.
* Formation chance through 48 hours...medium...30 percent.
* Formation chance through 5 days...high...70 percent.

An area of low pressure located about 1275 miles east-southeast of
the Big Island of Hawaii is producing minimal shower activity.
Upper-level winds are currently not conducive for development, but
they could become a little more favorable in a few days while the
low moves westward at around 10 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...medium...30 percent.

Public Advisories on Iselle are issued under WMO header WTPZ34 KNHC
and under AWIPS header MIATCPEP4. Forecast/Advisories on Iselle are
issued under WMO header WTPZ24 KNHC and under AWIPS header

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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