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Hurricane Douglas Advisory Number  19
NWS Central Pacific Hurricane Center Honolulu HI   EP082020
500 PM HST Fri Jul 24 2020
 
...MAJOR HURRICANE DOUGLAS STILL MOVING TOWARD HAWAII...
...HURRICANE WATCH ISSUED FOR OAHU...
 
 
SUMMARY OF 500 PM HST...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...17.9N 145.1W
ABOUT 665 MI...1070 KM E OF HILO HAWAII
ABOUT 865 MI...1390 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H
PRESENT MOVEMENT...WNW OR 295 DEGREES AT 20 MPH...31 KM/H
MINIMUM CENTRAL PRESSURE...967 MB...28.56 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
A Hurricane Watch has been issued for the island of Oahu.
 
SUMMARY OF WATCHES AND WARNING IN EFFECT...
 
A Hurricane Watch is in effect for...
* Hawaii County
* Maui County, including the islands of Maui, Lanai, Molokai and
Kahoolawe
* Oahu
 
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 500 PM HST (0300 UTC), the center of Hurricane Douglas was
located near latitude 17.9 North, longitude 145.1 West. Douglas is
moving toward the west-northwest near 20 mph (31 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 115 mph (185 km/h) with higher
gusts.  Douglas is a category 3 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 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 967 mb (28.56 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND:  Hurricane conditions are possible on the Big Island late
Saturday night and Sunday, with tropical storm conditions possible
by Saturday evening. Hurricane conditions are possible over Maui
County Sunday, with tropical storm conditions possible beginning
late Saturday night. Hurricane conditions are possible on Oahu
Sunday night, with tropical storm conditions possible 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 Hawaiian Islands from late Saturday night
through Monday. Total rain accumulations of 6 to 10 inches with
isolated maximum totals of 15 inches are possible, especially
in higher terrain. This rain may result in life-threatening
flash flooding and land slides.
 
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 800 PM HST.
Next complete advisory at 1100 PM HST.
 
$$
Forecaster Birchard
 
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