Flash Flood Watch for Ni‘ihau, Kaua‘i, O‘ahu

There is a Flash Flood Watch in Effect for the western half of the state from tonight through Wednesday afternoon.

Forecasters with the National Weather Service say “deep tropical moisture, combined with increasing instability” will result in periods of heavy showers and a few thunderstorms over Kauaʻi, Niʻihau and Oʻahu.

Satellite imagery (6.24.19) PC: NOAA/NWS.

According to the agency’s area synopsis issued early this morning, “a wet pattern is unfolding across the western end of the state due to an out of season upper low and surface front positioned to the west-northwest.”

The agency says “warm and humid conditions with increasing rain chances” are expected through Tuesday as the system drifts toward the islands.

“Although the main threat for heavy rain will initially focus over the western end of the state, a gradual eastward shift down the island chain will become a possibility by midweek.”

A return of a more typical trade wind is expected late Thursday through the upcoming weekend.