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Hurricane Douglas Advisory Number 18
NWS Central Pacific Hurricane Center Honolulu HI EP082020
1100 AM HST Fri Jul 24 2020
...MAJOR HURRICANE DOUGLAS CONTINUES TO TRACK TOWARD THE HAWAIIAN
...HURRICANE WATCH ISSUED FOR THE BIG ISLAND AND MAUI COUNTY...
SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION
ABOUT 785 MI...1260 KM ESE OF HILO HAWAII
ABOUT 985 MI...1585 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H
PRESENT MOVEMENT...WNW OR 295 DEGREES AT 18 MPH...30 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 Big Island of Hawaii and
for Maui County, including Maui, Lanai, Molokai and Kahoolawe.
SUMMARY OF WATCHES AND WARNING IN EFFECT...
A Hurricane Watch is in effect for...
* Big Island of Hawaii
* Maui County, including Maui, Lanai, Molokai and Kahoolawe
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 Hawaiian Islands 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
DISCUSSION AND OUTLOOK
At 1100 AM HST (2100 UTC), the center of Hurricane Douglas was
located near latitude 17.0 North, longitude 143.5 West. Douglas is
moving toward the west-northwest near 18 mph (30 km/h). This
motion is expected to continue for the next two days, 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 on Sunday and Monday.
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 and steady 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 115 miles
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.
SURF: Large swells generated by Douglas are expected to begin
affecting portions of the Hawaiian Islands on Saturday. 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 intermediate advisory at 200 PM HST.
Next complete advisory at 500 PM HST.