HIRSC - Weather Team continues to have watchful eyes on Hurricane Douglas (A category 2 hurricane) with winds of 110 mph.
All based on Weather Team assessments on the potential impacts for Hawaii Island and the island is expected to see some strong winds along with moderate to heavy showers with the possibility of thunderstorms in parts of Hawaii Island. The island should start seeing some effects beginning Saturday afternoon and evening moving into Sunday.
Tropical Storm Warning and Flash Flood Watch has been issued for the Island of Hawaii and remains in effect until further notice.
Closures have been announced and listed in the post.
Just as a reminder to all of our followers, now is the time to be completing preparation work and having all supplies ready for the potential of weather impacts related to Douglas closely approaching the state.
HIRSC - Hawaii Island Emergency Operations and Action Plans are in place and will out in the field beginning Saturday providing updates of events and things happening around the island ahead of the potential weather impacts related to Douglas' approach. Live Update is scheduled for 9 pm Saturday evening.
Published by: HIRSC - Weather Team and Utah (Springdale) Team
Tropical Cyclone Douglas Advisory as of 11 pm HST - 7/24/2020
Hurricane Douglas Advisory Number 20 NWS Central Pacific Hurricane Center Honolulu HI EP082020 1100 PM HST Fri Jul 24 2020 ...DOUGLAS WEAKENS SLIGHTLY BUT STILL HEADING TOWARD HAWAII... ...TROPICAL STORM WARNING ISSUED FOR HAWAII COUNTY AND MAUI COUNTY... SUMMARY OF 1100 PM HST...0900 UTC...INFORMATION ----------------------------------------------- LOCATION...18.5N 146.7W ABOUT 555 MI...890 KM E OF HILO HAWAII ABOUT 750 MI...1210 KM ESE OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...110 MPH...175 KM/H PRESENT MOVEMENT...WNW OR 295 DEGREES AT 18 MPH...30 KM/H MINIMUM CENTRAL PRESSURE...972 MB...28.71 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... A Tropical Storm Warning has been issued for Hawaii County and Maui County, including the islands of Maui, Lanai, Molokai and Kahoolawe. SUMMARY OF WATCHES AND WARNING IN EFFECT... 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 * Oahu A Tropical Storm Warning means that tropical storm conditions are expected somewhere withing the warning area within 36 hours. A Hurricane Watch means that hurricane conditions are possible within the watch area, in this case within 36 to 48 hours. Interests elsewhere in the main Hawaiian Islands, and 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 near latitude 18.5 North, longitude 146.7 West. Douglas is moving toward the west-northwest near 18 mph (30 km/h). This motion is expected to continue through Saturday, followed by a slight decrease in forward speed and a turn toward the west. On the forecast track, Douglas will be near the main Hawaiian Islands Saturday night through Sunday night. Maximum sustained winds are near 110 mph (175 km/h) with higher gusts. Douglas is a category 2 hurricane on the Saffir-Simpson Hurricane Wind Scale. Gradual weakening is expected to continue through the weekend. However, Douglas is still forecast to be near hurricane strength when it nears the islands. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical-storm-force winds extend outward up to 115 miles (185 km). The estimated minimum central pressure is 972 mb (28.71 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Hurricane conditions are possible across portions of the main Hawaiian Islands late Saturday night through Monday. Tropical Storm conditions are expected across Hawaii County and Maui County beginning Saturday night or Sunday. SURF: Large swells generated by Douglas are expected to affect the Hawaiian Islands this weekend. These swells are likely to cause life-threatening surf and rip current conditions for a couple of days. RAINFALL: Heavy rainfall associated with Douglas is expected to affect portions of the main Hawaiian Islands from late Saturday night through Monday. Total rain accumulations of 5 to 10 inches with locally higher amounts will be possible on the smaller islands, especially across elevated terrain. This rain may result in life-threatening flash flooding and land slides, as well as rapid water level rises on small streams. 3 to 6 inches of rainfall are possible on the Big Island, with locally higher amounts. Key messages for Douglas can be found in the Tropical Cyclone Discussion under AWIPS header HFOTCDCP2 and WMO header WTPA32 PHFO.
East Pacific Basin Outlook as of 7/24/2020:
Tropical Weather Outlook NWS National Hurricane Center Miami FL 1100 PM PDT Fri Jul 24 2020 For the eastern North Pacific...east of 140 degrees west longitude: 1. An area of low pressure could form south of the southern coast of Mexico later this weekend or early next week. Any development of this system thereafter should be slow to occur while it moves generally west-northwestward. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...10 percent.
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