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This page was last loaded at 7:11 am HST Jul 26, 2014 (1711 GMT Jul 26, 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: Jul 26, 2014 2:30 AM HST

Based on data through 2:00 am Jul 26 2014 HST

The pressure gradient south of a surface ridge located more than 1100 miles north of Honolulu was maintaining moderate trade winds across the main Hawaiian islands early this morning. The low-level trade wind flow was carrying scattered to locally broken low clouds with embedded isolated showers across the windward Hawaiian waters. There were also patches of low clouds and a few showers over the ocean leeward of some of the islands.

The individual low cloud elements over the windward coastal waters were generally moving westward at 15 to 20 mph. The highest tops of the low clouds in the vicinity of the main Hawaiian islands were estimated to be 7 to 8 thousand feet. Upstream from the islands, the leading edge of a large area of mainly broken low clouds with embedded scattered showers was about 70 miles east of Hilo. This leading edge has advanced westward at almost 20 mph during the past 6 hours.

As of 200 am HST Saturday, there were scattered to broken low clouds across parts of Kauai. Broken low clouds were along the windward shoreline and Koolau range of Oahu. There were mainly scattered low clouds elsewhere on Oahu. Skies appeared to be mostly clear on Molokai, while a few low clouds were detected above Lanai. On Maui, broken low clouds were affecting parts of the windward coastal areas, the lower windward slopes of mount Haleakala and the western mountains. Scattered to broken low clouds covered portions of the lower elevations of the windward Big Island.

According to loops of water vapor imagery, the axis of a narrow upper level trough extended from near 30°N 160°W to 19°N 172°W, or about 545 miles west northwest of Lihue. This upper level feature has propagated toward the east southeast at about 10 miles per hour during the past 6 hours. A subtropical jet stream along the southeastern flank of this trough aloft extended from near 20°N 167°W to 25°N 158°W. Southwesterly winds of 55 to 75 miles per hour within the core of the jet stream were carrying a few wisps of cirrus clouds rapidly toward the northeast just to the west of Kauai. Elsewhere, an upper level ridge just east of the Big Island extended northward from an upper level anticyclone centered near 13°N 156°W. The close proximity of this upper level ridge was contributing to the stable conditions across the aloha state early this morning.

In the deep tropics far south of the main Hawaiian islands, the Central Pacific Hurricane Center has been following an elongated surface trough located about 720 miles south southeast of South Point on the Big Island, which has been moving westward at about 10 mph. However, there has been a dramatic decrease in the coverage of showers and thunderstorms associated with this system since early Friday evening. The surface trough extended further east from this disturbance through 10°N 149°W to 12°N 140°W. Isolated moderate thunderstorms were within 200 miles of this section of the trough. The highest tops of these cumulonimbus clouds were estimated to be 53 thousand feet.

Elsewhere, the National Hurricane Center /nhc/ in Miami, Florida is issuing advisories on tropical storm Genevieve, located about 1350 miles east southeast of Hilo. Based on the latest forecast, Genevieve is expected to cross longitude 140°W into the north central Pacific ocean late tonight or early Sunday morning. For additional information on Genevieve, see public advisories issued by NHC under WMO header wtpz32 KNHC and under AWIPS header MIATCPEP2.

Hawaii Infrared Satellite image for 1200 UTC

Central Pacific Infrared Satellite image for 1200 UTC


Wind Speed Probabilities for Tropical Depression Genevieve

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 Depression GENEVIEVE Forecast Advisory Number 6
Issued at 1500 UTC SAT JUL 26 2014

Tropical Depression GENEVIEVE 5-Day Uncertainty Track Image
5-Day Uncertainty Track last updated Sat, 26 Jul 2014 14:33:47 GMT

xml button  Tropical Depression EIGHT-E Forecast Advisory Number 2
Issued at 1500 UTC SAT JUL 26 2014

Eastern Pacific Graphical Tropical Weather Outlook

500 AM PDT SAT JUL 26 2014

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

The National Hurricane Center is issuing advisories on Tropical
Storm Genevieve, located more than a thousand miles east-southeast
of the Big Island of Hawaii, and on newly formed Tropical Depression
Eight-E located a few hundred miles southwest of the southwestern
coast of Mexico.

Shower activity associated with a low pressure area located about
1250 miles west-southwest of the southern tip of the Baja California
peninsula is becoming better organized, and a tropical depression
could be forming. If this trend continues, advisories will be
initiated later today. However, upper-level winds are forecast to
become highly unfavorable tonight or Sunday, and this could halt
additional development of the system as it moves westward at about
10 mph.
* Formation chance through 48 hours...high...70 percent.
* Formation chance through 5 days...high...70 percent.

An area of low pressure is forecast to form well south of southern
Mexico late this weekend. Some gradual development of this system
is possible after that time.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...20 percent.

Public Advisories on Eight-E are issued under WMO header WTPZ33 KNHC
and under AWIPS header MIATCPEP3. Forecast/Advisories are issued
under WMO header WTPZ23 KNHC and under AWIPS header MIATCMEP3.

Eastern Pacific Graphical Tropical Weather Outlook

Monitored by the National Hurricane Center (NHC)


Hurricane Preparedness

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Oahu Department of Emergency Management
Kauai Civil Defense
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)
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  • Category 5 - winds 157 mph and up (137+ kt)
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