There's an increased chance of heavier showers and thunderstorms for the Big Island and Maui tonight and Friday, prompting the National Weather Service to issue a Flash Flood Watch through late Friday night.
A Flash Flood Watch means that conditions could develop that may lead to dangerous flash flooding.
The same storm system may drop six to 12 inches of snow on the summit areas of Mauna Kea and Mauna Loa above 11,000 feet. Those areas are under a Winter Storm Warning, effective from 6 p.m. Thursday to 6 p.m. Friday.
There's an area of instability that will enhance an incoming pool of moisture from the east, bringing a threat of heavy showers. Most of those showers will be focused on windward slopes, but afternoon heating could also cause heavy showers to develop leeward.
Persons on the Big Island and Maui should avoid camping and hiking near streams and low-lying areas that are prone to flooding. You also monitor the latest forecasts and be prepared to take action if flash flooding occurs.
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