A Cold Front is continuing to drench the western half of the state and still expected to bring rainfall to the Island of Hawaii later today (Wednesday, February 3rd) and also bringing with it breezy winds ahead of its arrival to the island. Also, Snowfall is still forecasted for the summits of Maunakea and Mauna Loa.
Drier and cooler air mass to take over following the Cold Front departure from the state, bringing possible record lows as well.
Published by: HIRSC - Weather Team
A strong cold front approaching Kauai will bring significant changes to the weather across the islands as it moves down the island chain later today and tonight. Locally windy conditions are expected today. In addition, cloud cover and showers will increase with a threat of locally heavy rainfall. There is also a chance of thunderstorms with gusty winds. Expect the northerly flow behind the front to bring drier and cooler air over the islands from tonight into the weekend.
A strong cold front appears to a short distance northwest of Kauai early this morning. This feature, which has been moving toward the east-southeast at around 15 mph, is accompanied by overcast layered clouds with embedded showers and isolated thunderstorms. The background low-level flow ahead of this feature is from the south to southwest. The winds have increased ahead of the front, so a Wind Advisory has been issued for Kauai County and Oahu. The windy conditions with localized strong gusts will likely be most prevalent over mountain ridges and along the northeast and east sides of the islands. Note that these windy conditions may eventually spread to portions of Maui County later today. Clouds and showers continue to increase over the western islands. As the front nears Oahu later this morning, a sharp upper-level trough digging toward the state is expected to cause increasing atmospheric instability. This scenario would likely enhance precipitation ahead of and along the front. This will likely cause locally heavy rainfall with the potential for water ponding issues on some roadways on Oahu during the morning commute. The leading edge of the front is then expected to move across Maui County during the afternoon. As the front moves through Maui, it is expected to gradually weaken as it approaches the Big Island this evening. Thunderstorms are still possible ahead of and along the front, and the main issues will likely be related to any thunderstorm development. Temperatures will be cold enough for snow over the summits of Mauna Kea and Mauna Loa on the Big Island, and there could be several inches of snow from some time this afternoon into tonight. As a result, Winter Weather Headlines may be needed for the Big Island Summits later today or tonight. The forecast guidance shows surface high-pressure building behind the front. This will produce northerly flow across the entire state. These northerly winds will likely transport significantly cooler and drier air down across all islands. As the dew point temperatures drop into the 50s due to the cool air advection, expect minimum temperatures in the low 60s for many areas, with select locations dropping into the 50s tonight and Thursday nights. Note that record minimum temperatures in some locations, such as on Kauai, are in the 50s, so it is not out of the question that a new record low temperature or two may be set somewhere in the state later this week.