Station Name: Kaumalapau Southwest, Lanai, HI (239)
Station Type: Buoy
Data Source: National Data Buoy Center

Elevation Above Sea Level: 0 feet

Nearest Address:
Offshore
Lanai City, HI 96763
Maui County

GPS Coordinates: 20.75, -157.003

Nearby Water Temperatures

Hydrologic Outlook issued April 4 at 8:55AM HST by NWS Honolulu HI

Effective: Sat April 4, 2026, 8:55 AM
Expires: Tue April 7, 2026, 6:00 PM

ESFHFO Southerly winds associated with low pressure developing northwest of the islands will draw a very moist tropical airmass northward early next week. This will bring periods of heavy rain and a risk of flash flooding. The most likely period for significant impacts is Wednesday night through Thursday night. However, afternoon shower development over island interiors on Tuesday may be heavy as well. The duration of flooding potential remains less certain than usual as deep moisture remains over the state into the middle of April leading to potential for additional waves of heavy rain next weekend or beyond. Now would be a good time to clear storm drains, culverts, and other drainage areas of debris to help reduce localized flooding. This outlook will be updated daily or sooner if needed. Stay up to date with the latest forecast information through weather.gov/hawaii, local media, social media, or NOAA Weather Radio broadcasts.

Flood Watch issued April 7 at 3:08AM HST until April 10 at 6:00PM HST by NWS Honolulu HI

Effective: Tue April 7, 2026, 3:08 AM
Expires: Tue April 7, 2026, 5:15 PM

...FLOOD WATCH FOR ALL ISLANDS IN THE STATE OF HAWAII... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...The island of Kauai, Niihau, Oahu, Maui, Molokai, Lanai, Kahoolawe, and the Big Island. * WHEN...From Wednesday morning through Friday afternoon. * IMPACTS...Significant flooding may occur due to excessive rainfall and overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain. * ADDITIONAL DETAILS... - A deep layered trough will develop west of the islands and draw abundant moisture northward as it strengthens on Tuesday. Instability and upward forcing will enhance the available moisture and bring the potential for heavy rain and thunderstorms leading to flash flooding across all islands in the state of Hawaii.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

High Surf Advisory issued April 7 at 7:40PM HST until April 9 at 6:00AM HST by NWS Honolulu HI

Effective: Tue April 7, 2026, 7:40 PM
Expires: Wed April 8, 2026, 8:45 AM

...HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL HAWAIIAN ISLANDS... .Surf along south facing shores will steadily rise tonight and peak on Wednesday above advisory thresholds. * WHAT...Large breaking waves of 7 to 10 feet with occasional higher sets to 12 feet. * WHERE...South facing shores of Niihau, Kauai, Oahu, Molokai, Maui, Lanai, Kahoolawe, and the Big Island. * WHEN...Until 6 AM HST Thursday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous.

Heed all advice from ocean safety officials. When in doubt, don't go out.

Flash Flood Warning issued April 7 at 6:57PM HST until April 7 at 9:15PM HST by NWS Honolulu HI

Effective: Tue April 7, 2026, 6:57 PM
Expires: Tue April 7, 2026, 9:15 PM

FFWHFO The National Weather Service in Honolulu has issued a * Flash Flood Warning for... The island of Maui in Maui County * Until 915 PM HST. * At 657 PM HST, radar indicated persistent heavy rain mainly between Hana and Hamoa. Rain was falling at a rate of 2 to 4 inches per hour with the heaviest rain along the slopes of east Maui. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by heavy rain. SOURCE...Radar. IMPACT...Flooding in drainages, streams, rivers, roads, properties, and other low-lying areas. Public road closures possible in some areas. Landslides are possible in steep terrain. * Some locations that will experience flash flooding include... Hana, Kipahulu and Hamoa.

Stay away from streams, rivers, drainage ditches, and culverts, even if they are currently dry.

Flood Watch issued April 7 at 2:45PM HST until April 10 at 6:00PM HST by NWS Honolulu HI

Effective: Tue April 7, 2026, 2:45 PM
Expires: Thu April 9, 2026, 6:15 PM

...FLOOD WATCH FOR ALL HAWAIIAN ISLANDS... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...All Hawaiian islands. * WHEN...From Wednesday morning through Friday afternoon. * IMPACTS...Significant flooding may occur due to excessive rainfall and overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain. * ADDITIONAL DETAILS... - Low pressure will develop west of the islands and draw abundant moisture northward as it strengthens during the next couple of days. This will bring potential for heavy rain and thunderstorms leading to flash flooding over all Hawaiian islands.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.