Public Tropical Cyclone Advisory
171 WTPA32 PHFO 161454 TCPCP2 BULLETIN Tropical Storm Lala Advisory Number 17 NWS Central Pacific Hurricane Center Honolulu HI CP012026 Issued by NWS National Hurricane Center Miami FL 500 AM HST Sun Aug 16 2026 ...LIFE-THREATENING FLOODING CONTINUES ACROSS PORTIONS OF THE BIG ISLAND OF HAWAII AND MAUI COUNTY... ...HEAVY RAINFALL AND GUSTY WINDS SPREADING OVER OAHU... SUMMARY OF 500 AM HST...1500 UTC...INFORMATION ---------------------------------------------- LOCATION...20.2N 158.1W ABOUT 140 MI...230 KM WNW OF KAILUA-KONA HAWAII ABOUT 75 MI...125 KM S OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...991 MB...29.27 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Hawaii County * Maui County, including the islands of Maui, Lanai, Molokai and Kahoolawe * Oahu * Kauai County, including the islands of Kauai and Niihau A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within 12 to 24 hours. Interests in the Papahanaumokuakea Marine National Monument should monitor the progress of Lala. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 500 AM HST (1500 UTC), the center of Tropical Storm Lala was located near latitude 20.2 North, longitude 158.1 West. Lala is moving toward the northwest near 14 mph (22 km/h) but is expected to turn westward later today. A continued westward motion is forecast through Tuesday night. The core of the storm is forecast to remain south of the smaller main Hawaiian Islands and the easternmost Northwestern Hawaiian Islands during the next couple of days. Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Slight additional weakening is expected during the next day or so. Some restrengthening is forecast by midweek. Tropical-storm-force winds extend outward up to 140 miles (220 km) from the center. A weather station (Ilio 1) on the northwestern portion of Molokai at an elevation of 175 ft recently reported a sustained wind of 53 mph (85 km/h) and a gust of 69 mph (111 km/h). The estimated minimum central pressure is 991 mb (29.27 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Lala can be found in the Tropical Cyclone Discussion under AWIPS header HFOTCDCP2 and WMO header WTPA42 PHFO. WIND: Tropical storm conditions continue across portions of the Big Island of Hawaii and Maui County, with the strongest winds occurring in areas of higher terrain. Tropical storm conditions will spread across Oahu this morning and Kauai County later today. Wind speeds atop mountains and on the windward and leeward slopes are often up to 30 percent stronger than the near-surface winds indicated in this advisory, and in some elevated locations could be even greater. RAINFALL: Lala is expected to produce additional rainfall of 1 to 3 inches across windward portions of the the Big Island and windward Maui, with maximum storm total of 30 to 35 inches over the windward Big Island. Across the remainder of the island chain total rainfall of 2 to 6 inches is expected, with the highest totals over windward Kauai. This rainfall may produce life-threatening flooding and mudslides, especially in areas of steep terrain. For a complete depiction of forecast rainfall associated with Lala, please see the National Weather Service Storm Total Rainfall Graphic available at hurricanes.gov/graphics_cp2.shtml?rainqpf For a list of rainfall observations and wind reports associated with Lala, see the companion storm summary at WBCSCCNS2 with the WMO header ACUS42 KWBC or at the following link: www.wpc.ncep.noaa.gov/discussions/nfdscc2.html. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... Oahu...1-2 ft Kauai...1-2 ft The deepest water will occur along the immediate coast, where the surge will be accompanied by large and dangerous waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. For a complete depiction of areas at risk of storm surge inundation, please see the National Weather Service Peak Storm Surge Graphic, available at hurricanes.gov/graphics_cp2.shtml?peakSurge. SURF: Swells generated by Lala will continue to build westward across the exposed windward waters today. Swells will also build over the exposed leeward waters as Lala passes south of the islands. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 800 AM HST. Next complete advisory at 1100 AM HST.