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This page was last loaded at 7:20 pm HST Jul 5, 2015 (520 GMT Jul 06, 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: Jul 05, 2015 2:30 PM HST

Based on data through 2:00 pm Jul 05 2015 HST

A weak upper low about 510 miles northeast of Hilo was moving south around 10 miles an hour this afternoon. No significant weather was attributed to the low which was producing only a few tufts of cirrus just east of its center.

Meanwhile, high pressure in the upper atmosphere Sat between 20°N and 30°N from the Hawaiian islands out to the international date line. A fairly strong northerly wind flow over the islands was keeping the air mass on the stable side across the state.

Patchy scattered cumulus clouds were common around the island chain this afternoon. The low clouds nearby were moving mainly toward the west at between 10 and 15 miles an hour.

At 2 pm, cloud build ups were producing cloudy to mostly cloudy skies over the west half of the Big Island. The east half was partly to mostly cloudy. The other islands were mostly sunny with just some small areas mainly over the mountains and leeward sections.

A stationary frontal boundary Sat well northwest of the area. The 50 to 60 miles wide frontal cloud band was centered along a line through 30°N 168°W to 24°N 175°W to beyond 23°N 180°E. The broken to overcast low cloud band had tops mainly between 11000 and 13000 feet high.

Patches of low clouds north of 24°N between the front and 160°W were moving northward. This was due to their being situated between the front and a surface ridge extending through 30°N 153°W to 24°N 160°W.

Hawaii Visible Satellite image for 0000 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 PM PDT SUN JUL 5 2015

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

An elongated area of low pressure located about 1100 miles
east-southeast of the Hawaiian Islands continues to produce
disorganized showers and thunderstorms. Development of this
disturbance is not expected since upper-level winds are forecast
to become unfavorable in a day or so. The low is expected to drift
westward or west-northwestward over the next several days, and move
into the central Pacific Ocean basin later tonight or on Monday.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...low...10 percent

A large low pressure system centered about 1550 miles southwest
of the southern tip of Baja California Sur is producing an
extensive area of cloudiness and showers. Satellite-derived
surface wind data indicate that the low is gradually becoming
better defined, and environmental conditions are forecast to
become more conducive for development over the next several days.
A tropical depression is expected to form by mid-week while the
system moves west-northwestward at about 15 mph.
* Formation chance through 48 hours...medium...50 percent
* Formation chance through 5 days...high...90 percent

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


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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 111-130 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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