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This page was last loaded at 5:45 pm HST Jul 31, 2014 (345 GMT Aug 01, 2014)

Central Pacific (140W to 180) xml button

Active Systems
xml button  Post-Tropical Cyclone GENEVIEVE Advisory Number 21
Issued at 1100 AM HST THU JUL 31 2014
Location: 13.0N 151.1W
Maximum sustained winds: 35 MPH...55 KM/H
Present movement: W or 270 degrees AT 7 MPH...11 KM/H
Minimum central pressure: 1009 MB...29.80 INCHES

Tropical Outlook Sea Surface Temperatures CPAC Satellite EPAC Satellite Widgets Satellite Message Forecast Discussion

xml button

Issued: Jul 31, 2014 2:30 PM HST

Based on data through 2:00 pm Jul 31 2014 HST

An area of overcast low clouds extends from 140°W to 155°W between 10°N and 25°N. These low clouds are moving west at 15 to 20 mph. Clouds transitions from overcast to scattered west of 155°W as low stratocumulus /sc/ and stratus morph into sc and cumulus. Near the dateline, low clouds veer to the NW as they near a weak cold front oriented from 30°N 172°W to 26°N and the dateline. Along the front, towering cumulus and isolated thunderstorms are forming with highest cloud tops reaching 40 thousand feet.

Over the state of Hawaii, trade winds are pushing low clouds into windward slopes and coasts bringing partly to mostly cloudy skies while leeward locations of the smaller islands have partly cloudy skies. The leeward Big Island lower slopes have overcast low clouds while mostly clear skies prevail over the summits.

Former tropical depression Genevieve is located about 525 miles SSE of Hilo. They low is generating layered clouds up to 25 thousand feet and isolated thunderstorms west of the center of circulation.

Another tropical low located near 12°N 165°W.OR about 850 miles SW of Oahu, is generating layered clouds up to 30 thousand feet with a small area of consistent thunderstorms near the center of circulations. Highest cloud tops are reaching are reaching 54 thousand feet. This low is moving 10 mph toward the west.

Hawaii Infrared Satellite image for 0000 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

Active Systems

xml button  Tropical Storm ISELLE Forecast Advisory Number 2
Issued at 0300 UTC FRI AUG 01 2014

Eastern Pacific Graphical Tropical Weather Outlook

500 PM PDT THU JUL 31 2014

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

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

An area of low pressure located about 1350 miles east-southeast of
the Big Island of Hawaii is producing disorganized shower and
thunderstorm activity. Upper-level winds are only marginally
favorable, and any development of this system should be slow to
occur while it moves westward at around 10 mph during the next few
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...low...20 percent.

Disorganized showers and thunderstorms continue in association with
a tropical wave located several hundred miles south-southwest of
Acapulco, Mexico. Some gradual development of this system is
possible during the next few days while it moves westward at 10 to
15 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...medium...40 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

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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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