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Hurricane Douglas Intermediate Advisory Number 21A
NWS Central Pacific Hurricane Center Honolulu HI   EP082020
800 AM HST Sat Jul 25 2020
 
...HURRICANE DOUGLAS CONTINUES TO MOVE WEST-NORTHWEST TOWARD
HAWAII...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...19.1N 149.1W
ABOUT 390 MI...625 KM E OF HILO HAWAII
ABOUT 590 MI...950 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...100 MPH...160 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 18 MPH...30 KM/H
MINIMUM CENTRAL PRESSURE...982 MB...29.00 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
None.
 
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 Watch is in effect for...
* Kauai County, including the islands of Kauai and Niihau.
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
 
A Hurricane Watch means that hurricane conditions are possible
within the watch area, in this case within the next 36 to 48 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 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 800 AM HST (1800 UTC), a U.S. Air Force 53rd Weather 
Reconnaissance aircraft located the center of Hurricane Douglas 
near latitude 19.1 North, longitude 149.1 West. Douglas is moving 
toward the west-northwest near 18 mph (30 km/h). This motion
is expected to continue with a slight decrease in forward speed
today, followed by a slight turn toward the west tonight through
Monday. On the forecast track, Douglas will be near the main
Hawaiian Islands late tonight through Sunday night.
 
Maximum sustained winds are near 100 mph (160 km/h) with higher
gusts. Gradual weakening is expected 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 982 mb (29.00 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND:  Hurricane conditions are possible across portions of the
main Hawaiian Islands late tonight through Sunday night. Tropical
Storm conditions are expected across Hawaii County and Maui County
beginning late tonight or Sunday. Tropical Storm conditions are
possible across Kauai County late Sunday or Sunday night.
 
SURF:  Large swells generated by Douglas are expected to affect
the Hawaiian Islands this weekend, and storm surge of around 2 
feet above normal tides is expected near the center of Douglas. The 
large swells and surge will produce life threatening and 
potentially damaging surf along exposed shores.
 
RAINFALL:  Heavy rainfall associated with Douglas is expected to
affect portions of the main Hawaiian Islands from late tonight
through 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 is expected to
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 AM HST.
 
$$
Forecaster Wroe
 
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