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Hurricane Douglas Intermediate Advisory Number 23A
NWS Central Pacific Hurricane Center Honolulu HI   EP082020
800 PM HST Sat Jul 25 2020
 
...HURRICANE DOUGLAS DRAWING CLOSER TO HAWAII...
 
 
SUMMARY OF 800 PM HST...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...20.1N 152.0W
ABOUT 295 MI...475 KM ESE OF KAHULUI HAWAII
ABOUT 390 MI...630 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...90 MPH...145 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...982 MB...29 INCHES
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
None.  
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
 
A Hurricane Warning is in effect for...
* Oahu
 
A Tropical Storm Warning is in effect for...
* Hawaii County
* Maui County, including the islands of Maui, Lanai, Molokai and
Kahoolawe
* Kauai County, including the islands of Kauai and Niihau.
 
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 within 36 hours.
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 
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 800 PM HST (0600 UTC), the center of Hurricane Douglas was
located near latitude 20.1 North, longitude 152.0 West. Douglas 
is moving toward the west-northwest near 16 mph (26 km/h). This 
motion is expected to continue through the next couple of days. On 
the forecast track, Douglas will be near the main Hawaiian Islands 
late tonight and is expected move near, or over, parts of the state
Sunday and Sunday night.
 
Maximum sustained winds are near 90 mph (150 km/h) with higher
gusts. Gradual weakening is expected over the next couple of days.
However, Douglas is still forecast to be near hurricane strength
when it passes near 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 982 mb (29.00 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND:  Hurricane conditions are expected on Oahu on Sunday and are
possible across Maui County and the Big Island on Sunday. Tropical
Storm conditions are expected across Hawaii County and Maui County
beginning late tonight or Sunday and across Kauai County Sunday
night.
 
SURF:  Large swells generated by Douglas are expected to build
tonight and affect the Hawaiian Islands Sunday into Monday, and
storm surge of 2 to 4 feet above normal tides is expected near the
center of Douglas. The large swells and surge will produce life
threatening and potentially destructive surf along exposed shores.
 
RAINFALL:  Heavy rainfall associated with Douglas is expected to
affect portions of the main Hawaiian Islands from late tonight
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 complete advisory at 1100 PM HST.
 
$$
Forecaster Birchard
 
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