An unusually strong upper level disturbance moving over the state will support strong to severe thunderstorms, which could produce damaging winds and large hail. The greatest chance for severe thunderstorms will occur through the day today, with the threat slowly diminishing from west to east tonight through Saturday. For details on the potential for flash flooding, please see the Flood Watch (FFAHFO) that remains in effect for the entire State of Hawaii through 6 AM Saturday.

HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL HAWAIIAN ISLANDS UNTIL 6 PM HST TODAY. .A long-lived south swell will affect the islands into the weekend, keeping south shore surf at the High Surf Advisory threshold of 10 feet through this afternoon. * WHAT. Large breaking waves of 7 to 10 feet along south-facing shores. * WHERE. South-facing shores of all Hawaiian Islands. * WHEN. Until 6 PM HST this afternoon. * IMPACTS. Moderate. Strong breaking waves and strong currents will make swimming dangerous.

FLOOD WATCH FOR THE STATE OF HAWAII THROUGH 6 AM SATURDAY. * WHAT. Flash flooding caused by excessive rainfall remains possible. * WHERE. All the main Hawaiian islands. * WHEN. Through late tonight. * IMPACTS. 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. Remember, flash flooding can occur well downstream. * ADDITIONAL DETAILS. - The threat for strong to severe thunderstorms and heavy rainfall will continue across the state through tonight as a strong upper level disturbance settles southward over the area. Conditions will steadily improve from west to east later tonight through Saturday as this upper disturbance drifts eastward.