At 356 PM HST, Doppler radar indicated moderate to locally heavy showers continue over the Koolau Mountains and portions of windward Oahu, with the heaviest rain falling at a rate of 1 to 2 inches per hour. Water levels in the Waiahole and Waikane Streams have declined slightly but remain high enough to support water overflowing onto Kamehameha Highway. HAZARD...Flash flooding caused by heavy rain. SOURCE...Gauges reported. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Honolulu, Kahaluu, Waiahole, Ahuimanu, Waikane, Kaneohe, Kaaawa, Aiea, Kaneohe Marine Base, Halawa, Moanalua and Pearl City.

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...The island of Hawaii in Hawaii County... * WHEN...Until 615 PM HST. * IMPACTS...Minor flooding on roads, poor drainage areas, and in streams. * ADDITIONAL DETAILS... - At 321 PM HST, Doppler radar indicated areas of heavy showers and thunderstorms over interior and northern Big Island. Rain was falling at a rate of 1 to 2 inches per hour, with the heaviest showers upslope of Waimea. - Some locations that will experience flooding include... Kailua-Kona, Captain Cook, Waikoloa Village, Kapaau, Honokaa, Pohakuloa Training Area, Pohakuloa Camp, Puuanahulu, Kamuela, Puako, Kawaihae and Holualoa.

...HIGH SURF WARNING FOR SOUTH FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... ...HIGH SURF WARNING FOR WEST FACING SHORES OF BIG ISLAND THROUGH MONDAY NIGHT... ...HIGH SURF ADVISORY FOR EAST FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... .South swell from Hurricane Lowell is expected to rise rapidly Monday, and peak Monday night bringing warning level surf to exposed shorelines. This swell may shift out of the southwest late Monday night. Due to the track of Lowell, a sharp gradient in swell is expected from west to east. This will bring damaging surf to portions of Kauai County and possibly Oahu. Swell energy is expected to drop off quickly on Tuesday. A large, medium-period east swell from Tropical Storm Karina will also persist through at least Monday, producing advisory level surf along east facing shores. * WHAT...Surf of 7 to 10 feet through Monday morning, rapidly building Monday afternoon and evening up to 12 to 20 feet on Oahu and 12 to 16 feet on Maui County and the Big Island. * WHERE...South facing shores of Kahoolawe, Lanai, Maui, Molokai, Oahu and the Big Island. * WHEN...Until 6 AM HST Tuesday. * IMPACTS...Very High...Expect ocean water surging and sweeping across beaches, coastal benches, and lava flows creating the potential for impacts to coastal properties and infrastructure, including roadways. Powerful longshore and rip currents will be present at most beaches. Large breaking waves and strong currents may impact harbor entrances and channels causing challenging boat handling.

...HIGH SURF WARNING FOR SOUTH FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... ...HIGH SURF WARNING FOR WEST FACING SHORES OF BIG ISLAND THROUGH MONDAY NIGHT... ...HIGH SURF ADVISORY FOR EAST FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... .South swell from Hurricane Lowell is expected to rise rapidly Monday, and peak Monday night bringing warning level surf to exposed shorelines. This swell may shift out of the southwest late Monday night. Due to the track of Lowell, a sharp gradient in swell is expected from west to east. This will bring damaging surf to portions of Kauai County and possibly Oahu. Swell energy is expected to drop off quickly on Tuesday. A large, medium-period east swell from Tropical Storm Karina will also persist through at least Monday, producing advisory level surf along east facing shores. * WHAT...Surf of 7 to 10 feet through Monday morning rapidly building to 20 to 30 feet Monday afternoon and evening. * WHERE...South facing shores of Kauai and Niihau. * WHEN...Until 6 AM HST Tuesday. * IMPACTS...Extreme...Expect ocean water surging and sweeping over beaches, coastal benches, and roadways, creating the potential for significant damage to coastal properties and infrastructure, including roadways. Coastal evacuations and road closures are possible. Large breaking waves may affect harbor entrances and channels with significant damage possible to docks, piers, ramps, and boats. * ADDITIONAL DETAILS...Vulnerable coastal roadways from Poipu to Kekaha are susceptible to overwash, with Lawai road at a particular risk for overwash.

...HIGH SURF WARNING FOR SOUTH FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... ...HIGH SURF WARNING FOR WEST FACING SHORES OF BIG ISLAND THROUGH MONDAY NIGHT... ...HIGH SURF ADVISORY FOR EAST FACING SHORES OF ALL ISLANDS THROUGH MONDAY NIGHT... .South swell from Hurricane Lowell is expected to rise rapidly Monday, and peak Monday night bringing warning level surf to exposed shorelines. This swell may shift out of the southwest late Monday night. Due to the track of Lowell, a sharp gradient in swell is expected from west to east. This will bring damaging surf to portions of Kauai County and possibly Oahu. Swell energy is expected to drop off quickly on Tuesday. A large, medium-period east swell from Tropical Storm Karina will also persist through at least Monday, producing advisory level surf along east facing shores. * WHAT...Surf of 7 to 10 feet through Monday. * WHERE...East facing shores of Oahu, Molokai, Maui, and Big Island. * WHEN...Until 6 AM HST Tuesday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous.