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Hurricane Douglas Intermediate Advisory Number 25A
NWS Central Pacific Hurricane Center Honolulu HI   EP082020
800 AM HST Sun Jul 26 2020
 
...DANGEROUS HURRICANE DOUGLAS CLOSING IN ON THE HAWAIIAN ISLANDS...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
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LOCATION...20.9N 155.0W
ABOUT 90 MI...145 KM E OF KAHULUI HAWAII
ABOUT 185 MI...300 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...987 MB...29.15 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
None.
 
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
 
A Tropical Storm Watch is in effect for...
* Portions of the Papahanaumokuakea Marine National Monument from
Nihoa to 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 within the
next 12 hours.
 
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 800 AM HST (1800 UTC), the center of Hurricane Douglas was
located near latitude 20.9 North, longitude 155.0 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 90 mph (150 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 30 miles (45 km) from
the center and tropical-storm-force winds extend outward up to 105
miles (165 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 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 from early this
morning 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
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Next complete advisory at 1100 AM HST.
 
$$
Forecaster Wroe
 
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