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This page was last loaded at 11:28 am HST May 25, 2015 (2128 GMT May 25, 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: May 25, 2015 8:30 AM HST

Based on data through 8:00 am May 25 2015 HST

As of 800 am HST, water vapor satellite imagery showed an upper low centered near 30°N 140°W, with a trough extending south to 20°N 140°W. A cold front associated with this upper feature extended south and southwest from 30°N 138°W to around 22°N 140°W. Layered clouds associated with this system were shown east of 140°W and north of 24°N with mainly a narrow low-level cloud band extending south-southwest to 20°N between 145°W and 140°W. Cloud tops along this band or west of 140°W were less than 10 thousand feet. Overall motion of these clouds were toward the east around 20 mph north of 24°N and nearly stationary farther south and southwest along the boundary.

Broken to overcast low clouds were shown across Niihau and Kauai with additional coverage approaching from the north. Mostly clear skies were shown over Oahu with the exception of a few low clouds shown over and around the koolaus. Similar conditions were shown across much of Molokai, Maui and Lanai with the exception of a batch of broken to overcast stratocumulus along the northern coasts of Molokai and Maui. Over the Big Island, overcast low clouds were over the Hamakua coast and the southeast coast with mostly clear skies elsewhere or from the summits to the leeward areas.

Far S of the islands, numerous thunderstorms was observed within the intertropical convergence zone between the equator and 10°N from 140°W to 175°W. Cloud tops ranged from 50 to 60 thousand feet.

Hawaii Visible 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 MON MAY 25 2015

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

A nearly-stationary area of low pressure located about 1600 miles
west-southwest of the southern tip of Baja California is producing
a concentrated area of disorganized thunderstorms well away from
the low's circulation center. Satellite data indicate that the
circulation has become less defined since yesterday, and
environmental conditions are expected to continue to become less
conducive for development.
* Formation chance through 48 hours...low...20 percent
* Formation chance through 5 days...low...20 percent

An area of disturbed weather has formed several hundred miles south
of the coast of Mexico. Environmental conditions appear conducive
for gradual development of this system during the next several
days, and a tropical depression is likely to form after mid-week
while the disturbance moves slowly west-northwestward to
* Formation chance through 48 hours...low...near 10 percent
* Formation chance through 5 days...high...70 percent

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


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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 111-129 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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