HURRICANE DOUGLAS Oahu Outdoor Warning Siren activated (11AM July 26, 2020)


BULLETIN

Hurricane Douglas Advisory Number 26

NWS Central Pacific Hurricane Center Honolulu HI EP082020

1100 AM HST Sun Jul 26 2020

...DANGEROUS HURRICANE DOUGLAS NEAR MAUI...

SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION

-----------------------------------------------

LOCATION...21.2N 155.7W

ABOUT 55 MI...90 KM ENE OF KAHULUI HAWAII

ABOUT 140 MI...230 KM E OF HONOLULU HAWAII

MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H

PRESENT MOVEMENT...WNW OR 290 DEGREES AT 16 MPH...26 KM/H

MINIMUM CENTRAL PRESSURE...987 MB...29.15 INCHES

WATCHES AND WARNINGS

--------------------

CHANGES WITH THIS ADVISORY...

A Tropical Storm Warning has been issued for portions of the

Papahanaumokuakea Marine National Monument from Nihoa to French

Frigate Shoals.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

A Hurricane Warning is in effect for...

* 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 is in effect for...

* Hawaii County

* Portions of the Papahanaumokuakea Marine National Monument from

Nihoa to French Frigate Shoals

A Tropical Storm Watch is in effect for...

* Portions of the Papahanaumokuakea Marine National Monument from

French Frigate Shoals to Maro Reef

A Hurricane Warning means that hurricane conditions are expected

somewhere within the warning area, in this case within the next

24 hours.

A Tropical Storm Warning means that tropical storm conditions are

expected somewhere within the warning area, in this case imminently

on Hawaii County and within the next 36 hours over portions of the

Papahanaumokuakea Marine National Monument from Nihoa to French

Frigate Shoals.

A Tropical Storm Watch means that tropical storm conditions are

possible within the watch area, in this case within the next 36 to

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 AM HST (2100 UTC), the center of Hurricane Douglas was

located near latitude 21.2 North, longitude 155.7 West. Douglas is

moving toward the west-northwest near 16 mph (26 km/h), and this

motion is expected to continue over the next couple of days. On the

forecast track, Douglas will pass near, or over, the islands from

Maui to Kauai today and tonight.

Maximum sustained winds are near 85 mph (140 km/h) with higher

gusts. Gradual weakening is forecast during the next 48 hours, but

Douglas is expected to remain a hurricane as it moves through the

islands.

Hurricane-force winds extend outward up to 35 miles (55 km) from the

center and tropical-storm-force winds extend outward up to 115 miles

(185 km).

The estimated minimum central pressure is 987 mb (29.15 inches).

HAZARDS AFFECTING LAND

----------------------

WIND: Hurricane conditions are expected in portions of Maui County

today, on Oahu by this afternoon, and on Kauai and Niihau tonight.

Tropical Storm conditions are imminent across portions of the Big

Island. Due to the steep terrain of the islands, hurricane-force

wind gusts are possible even within the tropical storm warning area.

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 today into Monday.

Total rain accumulations of 5 to 10 inches are possible from Maui

County westward to Kauai County, with the greatest amounts up to 15

inches 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 an additional 2 to 4 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 PM HST.

Next complete advisory at 500 PM HST.

$$

Forecaster Wroe


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