Flash Flood Watch and Warning
The National Weather Service in Honolulu has issued a Flash Flood Warning for the island of Oahu until 11:45 PM. A Flash Flood Watch remains in effect for all other Hawaiian Islands tonight, through 6am HST Sunday Morning.
An unseasonably cold low in the middle and upper atmosphere is making for unstable conditions over the islands. The low will linger near the islands through tonight before weakening and moving east of the area on Sunday.
Unstable conditions will combine with moisture brought in on the trade flow to produce the threat of widespread heavy rainfall.
A Flash Flood watch means that conditions may develop that lead to flash flooding. Residents of Hawai`i are advised to monitor later forecasts to be prepared to take action should a Flash Flood Warning be issued.
Marine Weather Statement
The NWS has also issued a Marine Weather Statement for the waters of Hawai`i.
The upper level low is expected to bring scattered thunderstorms to Hawaiian waters tonight. Thunderstorms will generally drift west and northwest, but may also move erratically at times. Thunderstorms will produce frequent dangerous cloud-to-surface lightening strikes. Locally heavy downpours will reduce visibility. Gusty winds, increased seas and isolated waterspouts are possible.