Last Updated on Wednesday, 30 July 2014 01:50
Issued: Jul 30, 2014 8:30 AM HST
Water vapor imagery indicates an upper level low pressure trough resides along an axis from 30°N 149°W to Oahu to 13°N 180°E while a weak northeast to southwest oriented upper level ridge is centered near 16°N 137°W.
Closer to the surface, a stationary front is located along a curve from 30°N 177°W to 27°N 180°E with cumulus and isolated towering cumulus clouds within 100 miles of the front. Within the inter tropical convergence zone, ITCZ, which is meandering along 10°N west of 150°W and up to 16°N east of 150°W, there are a few areas of sustained convection.
The most significant is tropical depression Genevieve. The Central Pacific Hurricane Center is issuing advisories on tropical depression Genevieve. The system is located about 560 miles southeast of Hilo, and is moving W around 7 mph. This system has winds of 35 mph gusting to 45 mph. Layered and cumulonimbus clouds associated with Genevieve cover much of the area between 10.3°N to 15.3°N and 148.4°W to 152.8°W, with cloud tops ranging from 50 to 58 thousand feet. For further information about tropical depression Genevieve, please see bulletins under WMO header WTPA32 PHFO or AWIPS header HFOTCPCP2.
The second area of sustained convection is centered near 12°N 164°W. The cumulonimbus clouds extend out 200 miles from its center. This area of convection is moving slowly to the west with cloud tops rising to near 51 thousand feet. A third area of convection has just entered the area in the last few hours and is centered near 16°N 140°W. It is more compact compared to the other two areas with cumulonimbus clouds extending out about 100 miles from its center with cloud tops rising to around 54 thousand feet.
Also associated with the ITCZ are the cirrus clouds being advected to the northeast. They are south of a curve from 14°N 180°E to 16°N 170°W to 18°N 160°W to 20°N 150°W to 25°N 140°W.
In the vicinity of the main Hawaiian islands, scattered stratocumulus and cumulus clouds have pushed up against some of the windward slopes this morning with tops between 6000 and 9000 feet. To the northeast of the islands a large area of cloud cover is moving toward the state. The clouds are rising to heights around 12000 feet and are moving to the west-southwest around 15 miles per hour. At 1800 UTC, Niihau and Kahoolawe are sunny. Kauai, Oahu and the Big Island are mostly cloudy along windward slopes and coasts, and mostly sunny leeward. Molokai, Maui and Lanai are mostly cloudy on windward slopes and mostly sunny elsewhere.