HIRSC - Weather Team continues to watch Tropical Cyclone Douglas (currently a category 1 hurricane/tropical cyclone) with winds of 90 mph and approximately 240 miles East of Hilo, Hawaii Island moving to the west-northwest at 16 mph.
Tropical Cyclone Douglas center is expected to continue to pass to the north of Hawaii Island. Tropical Storm Warning, Flash Flood Watch, and Hurricane Watch remain in effect for Island until further notice.
Hawaii Island Weather: Tonight, humid conditions along with isolated showers and slightly breezy conditions in various parts of Hawaii Island. Tomorrow (July 26th), we can expect to see some breezy winds (30 to 45 mph) in various parts of Hawaii Island. Parts of the island could see moderate to heavy showers with the possibility of thunderstorms. Rainfall accumulations up to 4 inches have been forecasted and could be higher where heavy rain/thunderstorms occur. Weather conditions are expected to slowly improve going into Monday (7/26). Forecast also available in the post.
Since the latest forecast and outcome, HIRSC - Hawaii Island Team has since demobilized emergency operations and action plans and is expected to return normal operations beginning Sunday afternoon.
We will continue to monitor conditions and provide updates on all major events that occur on the Island.
Published by: HIRSC - Weather Team
Tropical Cyclone Douglas Advisory as of 8 am HST - 7/25/2020
Hurricane Douglas Advisory Number 24 NWS Central Pacific Hurricane Center Honolulu HI EP082020 1100 PM HST Sat Jul 25 2020 ...DANGEROUS HURRICANE DOUGLAS DRAWING CLOSER TO HAWAII... ...HURRICANE WARNING ISSUED FOR KAUAI COUNTY... SUMMARY OF 1100 PM HST...0900 UTC...INFORMATION ----------------------------------------------- LOCATION...20.4N 152.8W ABOUT 240 MI...390 KM E OF KAHULUI HAWAII ABOUT 335 MI...540 KM E OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 16 MPH...26 KM/H MINIMUM CENTRAL PRESSURE...983 MB...29.03 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... The Tropical Storm Warning for Kauai County has been upgraded to a Hurricane Warning. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A Hurricane Warning is in effect for... * Oahu * Kauai County, including the islands of Kauai and Niihau A Tropical Storm Warning is in effect for... * Hawaii County * Maui County, including the islands of Maui, Lanai, Molokai and Kahoolawe A Hurricane Watch is in effect for... * Hawaii County * Maui County, including the islands of Maui, Lanai, Molokai and Kahoolawe A Tropical Storm Watch is in effect for... * Portions of the Papahanaumokuakea Marine National Monument from Nihoa to French Frigate Shoals. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, in this case within the next 24 to 36 hours. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within the next 24 to 36 hours. A Hurricane Watch means that hurricane conditions are possible within the watch area, in this case within the next 12 to 24 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area within the next 48 hours. Interests elsewhere in the Papahanaumokuakea Marine National Monument should monitor the progress of this system. For storm information specific to your area, please monitor products issued by the National Weather Service office in Honolulu Hawaii. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM HST (0900 UTC), the center of Hurricane Douglas was located by reconnaissance aircraft near latitude 20.4 North, longitude 152.8 West. Douglas is moving toward the west-northwest near 16 mph (26 km/h), and this general motion is expected to continue for the next couple of days. On the forecast track, Douglas will pass dangerously close to the main Hawaiian Islands on Sunday. Maximum sustained winds are near 90 mph (150 km/h) with higher gusts. Some slow weakening is forecast during the next 48 hours, but Douglas is forecast to remain near hurricane intensity as it passes the islands, necessitating a Hurricane Warning for Kauai County. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 105 miles (165 km). The estimated minimum central pressure is 983 mb (29.03 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Hurricane conditions are expected on Oahu on Sunday and on Kauai and Niihau Sunday night, and remain possible across Maui County and the Big Island on Sunday. Tropical Storm conditions are expected across the Big Island and Maui County beginning early Sunday. SURF: Large swells generated by Douglas will affect the Hawaiian Islands into Monday, producing life-threatening and potentially destructive surf along exposed shores. STORM SURGE: The combination of higher than predicted water levels, dangerous storm surge, and large breaking waves will raise water levels by as much as 3 feet above normal tides near the center of Douglas. RAINFALL: Heavy rainfall associated with Douglas is expected to affect portions of the main Hawaiian Islands from early Sunday into Monday. Total rain accumulations of 5 to 10 inches are possible from Maui County westward to Kauai County, with the greatest amounts in elevated terrain. This rain may result in life-threatening flash flooding and land slides, as well as rapid water level rises on small streams. Douglas could produce 2 to 5 inches of rainfall over the northern half of the Big Island. Key messages for Douglas can be found in the Tropical Cyclone Discussion under AWIPS header HFOTCDCP2 and WMO header WTPA32 PHFO. NEXT ADVISORY ------------- Next intermediate advisory at 200 AM HST. Next complete advisory at 500 AM HST.
Weather Forecast for Hawaii Island on 7/26/2020 (Courtesy of Wunderground PWS Network):
Hilo: 60% Precip. / 0.10in - Windy. Showers early with clearing later in the day. High 87F. Winds S at 20 to 30 mph. Chance of rain 60%.
Honoka'a: 90% Precip. / 0.84in - Cloudy with showers. High around 85F. WSW winds shifting to E at 15 to 25 mph. Chance of rain 90%.
Waimea (Kamuela): 50% Precip. / 0.34in - Considerable cloudiness with occasional rain showers. High around 90F. Winds SW at 15 to 25 mph. Chance of rain 50%.
Kapa'au: 90% Precip. / 0.42in - Tropical storm conditions possible. Showers, with winds diminishing in the afternoon. High 86F. Winds WSW at 20 to 30 mph. Chance of rain 90%.
Puako: 50% Precip. / 0.31in - Cloudy with occasional rain showers. High near 90F. Winds SW at 15 to 25 mph. Chance of rain 50%.
Waikoloa Village: 90% Precip. / 0.51in - Considerable cloudiness with occasional rain showers. High 82F. Winds WSW at 10 to 20 mph. Chance of rain 90%.
Kailua-Kona: 40% Precip. / 0.10in - Rain showers early with increasing winds and cloudy skies later in the day. High around 85F. Winds SSW at 20 to 30 mph. Chance of rain 40%.
Holualoa: 40% Precip. / 0.10in - Rain showers early with increasing winds and cloudy skies later in the day. High around 85F. Winds SSW at 20 to 30 mph. Chance of rain 40%.
Captain Cook: 40% Precip. / 0.12in - Cloudy with occasional rain showers. High 83F. Winds SW at 15 to 25 mph. Chance of rain 40%.
Ocean View: 70% Precip. / 0.16in - Overcast with rain showers at times. High 77F. Winds S at 15 to 25 mph. Chance of rain 70%.
Na'alehu: 60% Precip. / 0.18in - Overcast with rain showers at times. High 81F. Winds SSW at 15 to 25 mph. Chance of rain 60%.
Volcano: 60% Precip. / 0.23in - Rain showers along with windy conditions. High 74F. Winds SSW at 20 to 30 mph. Chance of rain 60%.
Kea'au: 40% Precip. / 0.06in - Overcast with showers. Becoming windy in the afternoon. High near 85F. Winds S at 20 to 30 mph. Chance of rain 40%.
Pahoa: 40% Precip. / 0.07in - Windy with some rain showers. High 84F. Winds S at 20 to 30 mph. Chance of rain 40%.
Kalapana: 50% Precip. / 0.08in - Rain showers along with windy conditions. High 82F. Winds SSW at 20 to 30 mph. Chance of rain 50%.
Closures List for Hawaii Island:
From 7 pm Friday 7/24/2020 until further notice, All-East Hawaii Beach Parks from Keokea Beach Park in North Kohala to Whittington Beach Park in Ka'u will be closed.
At 2 PM Saturday 7/25/2020: All backcountry areas of Hawaii Volcanoes National Park will be closed and all visitors in those areas need to exit by 2 pm Saturday. All backcountry and camping permits have been canceled for this weekend.
Kaloko-Honokohau National Historical Park will be closed all day Sunday 7/26/2020
All Eastside State Parks from MacKenzie SP to Kalopa SP will be CLOSED 7/25 until an all-clear has been given and storm damage assessments have been conducted.
Waipio Valley Road will be closed to the general public begin 7 am Saturday morning (7/25/2020) until further notice.
Hawaii County Preparation Guide