Hawaiian Islands Satellite Interpretation Message
Wed, 22 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 22 2010.
The presence of a surface high far north of Kauai continued to maintain moderate trade winds across the Hawaiian island chain early this evening. The low-level trade wind flow was transporting broken low clouds and scattered showers associated with the remnants of an old frontal system across the coastal waters adjacent to windward Maui and the Big Island. There were mainly scattered low clouds with embedded isolated showers elsewhere across the Hawaiian coastal waters.
The general motion of the low clouds across the windward Hawaiian coastal waters was toward the west at 15 to 20 mph. The highest tops of the low clouds over the ocean surrounding the Hawaiian islands were estimated to be about 8 thousand feet.
As of 700 pm HST Tuesday, scattered to broken low clouds were over parts of Kauai, as well as along the Koolau and Waianae mountain ranges on Oahu. Scattered to locally broken low clouds were over the eastern tip of Molokai and the eastern coast of Lanai. On Maui, broken to overcast low clouds were above the lower slopes of mount Haleakala, the windward shorelines, the western mountains and the south central valley. Broken to locally overcast low clouds covered nearly all of the lower elevations of the Big Island.
The ragged band of broken clouds and scattered showers associated with the remnants of an old front were within 180 miles south of a line starting from a point 100 miles north of Kahului on Maui to 22°N 152°W to 25°N 147°W. The western edge of this band has shifted westward at about 15 mph during the past 6 hours.
According to loops of water vapor imagery and satellite derived upper level winds, the axis of a relatively weak northeast to southwest oriented upper tropospheric trough extended from a low aloft near 28°N 148°W to 23.5°N 157°W to 24°N 160°W. This trough aloft has moved slowly westward during the past 6 hours. This feature has not been having a significant impact on island weather this evening. However, the trough may be supporting the ragged band of low clouds and showers associated with the remnants of the former front adjacent to Maui and the Big Island.
An area of disorganized showers and scattered thunderstorms was centered about 530 miles south southeast of Hilo.
An area of showers and thunderstorms centered about 500 miles south southeast of Hilo. Continues to show signs of improved organization. However, the coverage and intensity of the thunderstorms within this area has been fluctuating during the past 12 hours. Gradual development of this feature is possible as it continues moving slowly toward the west northwest at about 10 mph during the next couple of days. The clouds and deep convection associated with this system were in the area from 10°N to 15°N between 150°W and 155°W. The highest tops of the cumulonimbus clouds associated with this feature were estimated to be about 43 thousand feet.
Elsewhere in the deep tropics far south of the Hawaiian islands, a surface trough extended from near 10.5°N 140°W to 10°N 145°W to 11°N 149.5°W. Isolated moderate thunderstorms were within 80 miles south of this trough. The intertropical convergence zone, or ITCZ, extended from near 10.5°N 157.5°W to 09°N 173°W to 07°N 180°W. Scattered moderate to locally strong thunderstorms were within 150 miles of the ITCZ west of 170°W, while isolated thunderstorms were within 80 miles of the ITCZ east of 170°W. The highest tops of the cumulonimbus clouds associated with the ITCZ were estimated to be about 52 thousand feet.
HOUSTON
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