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This page was last loaded at 10:44 am HST Jul 4, 2015 (2044 GMT Jul 04, 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 04, 2015 8:30 AM HST

Based on data through 8:00 am Jul 04 2015 HST

A cold front associated with a low far north near 45°N 166°W was straddling the Midway atoll area this morning. The low was moving north but the front near Midway was progressing eastward at 20 to 25 miles an hour. The frontal cloud band was about 70 miles wide with the leading edge stretching from 30°N 170°W to 26°N 180°E. The band was comprised of broken to overcast low clouds with tops between 13000 and 15000 feet.

Between the front and the main Hawaiian islands, patches and small clusters of scattered to broken low clouds were streaming northward at just over 15 miles an hour.

Near and just east of the Big Island, the trade wind influence was driving patches and small clusters of scattered to broken low clouds westward near 15 miles an hour. Patchy, mostly scattered low clouds were flowing more toward the northwest from Maui to Oahu and toward the north near Kauai.

At 8 am, small areas of broken to overcast clouds were noted over the east half of Kauai and waters immediately south of that island. Similar cloudiness was observed along the south Hilo and Puna coastlines with some smaller areas on the lee side of the Big Island between Kona and the area just northwest of South Point. The rest of the state was mostly sunny except for a few clouds along the mountains. Cloud tops were mainly in the 7000 to 10000 feet range.

Well south of the islands in the tropics, strong, scattered thunderstorms continued to erupt mostly from 02°N to 13°N between 145°W and 165°W. Weak areas of low pressure within this unstable air mass were seen near 10°N 164°W and near 09°N 150°W.

Hawaii Infrared Satellite image for 1800 UTC

Central Pacific Infrared Satellite image for 1800 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 AM PDT SAT JUL 4 2015

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

A small low pressure area located about 1200 miles east-southeast
of the Hawaiian Islands is producing poorly organized shower and
thunderstorm activity. While this low still has some potential for
development, upper-level winds are expected to prevent formation
after the weekend. The low is forecast to move slowly
west-northwestward for the next several days.
* Formation chance through 48 hours...low...20 percent
* Formation chance through 5 days...low...20 percent

Showers and thunderstorms associated with a broad area of low
pressure centered about 1400 miles southwest of Cabo San
Lucas Mexico are showing some signs of organization. Environmental
conditions are conducive for gradual development, and a tropical
depression is likely to form early next 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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