Water vapor images showed a broad area of low pressure in the middle atmosphere over, and to the southwest through west, of the main Hawaiian islands. High to middle cloud layers formed under this feature within 75 miles of the curve from 24°N 160°W to 21°N 159°W to 19°N 160°W. The low also pulled high to middle cloud layers out of the ITCZ further south, partly to mostly obscuring lower features roughly within the area north of 10°N and east of 161°W.
To the northwest, low to middle cloud layers associated with a front covered Hawaiian waters northwest of the line from 30°N 174°W to 27°N 180. This feature moved northwest slowly. Thinner high to middle cloud layers originally associated with the front now partly to mostly obscured lower features within 150 miles of the curve from 30°N 162°W to 25°N 167°W to 21°N 180.
To the south, light thunderstorm activity continued in the ITCZ from 09°N to 02°N. Layered debris clouds from this and earlier convection mostly to partly obscured lower features from 12°N to the equator, and also wrapped around the mid-level low further north as described in the first paragraph.
Otherwise, cloud cover across Hawaiian waters consisted mainly of moderately to densely packed marine stratocumuli and cumuli merging into areas of nearly solid low stratus overcast. Individual small cumuli also were present throughout. These clouds were greatest in areal coverage north of 20°N and east of 160°W. They generally rose to heights of 8000 to 10000 feet, and moved toward the west southwest at around 20 miles an hour.
Across the main Hawaiian islands, high to middle cloud layers associated with the mid-level low mostly to partly obscured lower features over Kauai county, Maui county, and Oahu. Where it was visible, lower cloud cover consisted mostly of marine stratocumuli moving ashore along slopes facing east. Afternoon cumulus buildups with their layered debris clouds also were significant, especially along middle slopes of Kau, south Kona, and north Kona districts on the Big Island. These lower clouds generally rose to heights of 6000 to 9000 feet. Radar data from near the islands showed scattered showers offshore to the southeast of the Big Island, but isolated showers at most elsewhere.