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This page was last loaded at 6:22 am HST Sep 23, 2014 (1622 GMT Sep 23, 2014)

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 23, 2014 2:30 AM HST

Based on data through 2:00 am Sep 23 2014 HST

To the west, thunderstorms developed along a trough within 75 miles of the line from 20°N 170°W to 20°N 167°W. Layered debris clouds from this convection partly to mostly obscured lower features within the area bounded by the curve from 21°N 170°W to 20°N 166°W to 17°N 168°W to 19°N 173°W.

To the northwest through northeast, stratocumulus and stratus fragments from a dissipated front extended across Hawaiian waters within 100 miles of the line from 24°N 165°W to 24°N 147°W.

To the southeast through southwest, moderate thunderstorm activity continued in the ITCZ from 12°N to 03°N across most of the area, and as far north as 16°N near 150°W. Layered debris clouds from this and earlier convection partly to mostly obscured lower features from 19°N to 01°N.

Otherwise, cloud cover across Hawaiian waters consisted mainly of individual small cumuli, though a few clumps up to 180 miles across also were present. These clouds generally rose to heights of 6000 to 9000 feet, and moved toward the west southwest at around 15 miles an hour.

Across the main Hawaiian islands, cloud cover consisted mostly of marine cumuli and stratocumuli moving ashore along slopes facing east to southeast, especially over the Big Island and Oahu. Layered debris clouds from afternoon cumulus buildups on Monday largely had dissipated. These clouds varied in height from 7000 to 12000 feet. Radar data from near the islands showed scattered showers over and northeast of the Kaiwi Channel, offshore along the coast of Puna district on the Big Island, and offshore in the lee plume to the west southwest of the Big Island, but isolated showers at most elsewhere.

Hawaii Infrared Satellite image for 1130 UTC

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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 AM PDT TUE SEP 23 2014

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

Showers and thunderstorms associated with a low pressure area
located a couple of hundred miles south of Acapulco, Mexico, have
changed little in organization over the last several hours.
Upper-level winds are expected to become more conducive for
development, and a tropical depression is likely to form during the
next day or two while the low moves westward or west-northwestward
at about 10 mph.
* Formation chance through 48 hours...high...70 percent.
* Formation chance through 5 days...high...90 percent.

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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Oahu Department of Emergency Management
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Maui 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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