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Hawaii Island Weather Outlook for January 25th, 2021

All Flood Advisories and Warnings for Hawaii Island have been canceled, however, the Flash Flood Watch for Hawaii Island remains in effect for Hawaii Island through Tuesday evening (January 26th) as unsettle weather conditions will persist over the island, bringing the possibility of moderate to heavy rainfall into Tuesday.

Published by: HIRSC - Weather Team


The Flash Flood Watch continues for

* The Big Island.

* Through Tuesday afternoon

* Deep moisture within an unstable east to southeast flow will
  produce a threat for flash flooding through Tuesday. While the
  primary flood threat will be over windward slopes, all areas of
  may experience flash flooding. Soils in the Kau, Puna, and Hilo
  Districts are saturated from recent heavy rainfall, and any
  additional heavy showers could lead to rapid flash flooding.

* Flood prone roads and other low lying areas may be closed due to
  elevated runoff and overflowing streams. Urban areas may receive
  more significant flooding and property damage due to rapid runoff.


Be prepared to take action if a Flash Flood Warning is issued. If
you experience heavy rain or rising waters, head to higher ground

A Flash Flood Watch means that conditions are favorable for flash
flooding. Flash Flooding is LIFE THREATENING. Do not cross fast
flowing water in your vehicle or on foot.


Area Forecast Discussion for Hawai'i as of 9:00 pm Monday evening: Synopsis A strong high-pressure system far north of the islands and a disturbance passing south of Oahu and Kauai this evening will keep moderate to breezy east to southeast winds, wet weather with heavy showers, thunderstorms, and the potential for flash flooding in the forecast through Tuesday. Shower coverage will diminish from east to west on Wednesday. Breezy trade winds and will focus showers over windward areas from Thursday through the weekend. Discussion A strong high-pressure system far north of the Hawaiian Islands will produce breezy east to southeast winds over the state through Tuesday. An upper-level low passing south of Oahu and Kauai this evening will continue to slowly drift northwestward, moving away from the islands on Wednesday. Unstable air around this low will combine forces with the breezy east to southeast winds to produce numerous rain showers, heavy at times, across the state. Local radar imagery showed wind convergence plumes forming west of Molokai and Lanai earlier today that produced significant rainfall and flash flooding as they moved over the island of Oahu. An elevated flash flood threat will continue across the state through Tuesday and a Flash Flood Watch remains in effect for all islands. Drier trends will return to the region with diminishing threats for heavy showers starting on Wednesday as the upper low continues to drift northwestward away from the island chain. A strong high pressure far north of the state will keep moderate to breezy easterly trade winds in the forecast through the weekend. Passing trade wind showers will favor windward and mountain areas with an increase in shower activity possible on Friday and Friday night. Short-range global model guidance remains in good agreement with this drying trend as an upper-level ridge keeps more stable weather conditions in place through Thursday. Medium range guidance for this weekend is trending towards more unsettled showers mainly affecting windward and mountain areas.

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