A flash flood watch is in effect from noon today through late tonight for the islands of Oʻahu, Kauaʻi and Niʻihau.

The National Weather Service says “increased moisture along a weak frontal boundary combined with instability aloft will greatly enhance the chance for heavy rainfall, thunderstorms and flash flooding,” during the watch period.

A Flash Flood Watch means that conditions are favorable for flash flooding. Motorists and pedestrians are reminded not to cross fast flowing water in their vehicle or on foot, as it could be life-threatening.