Tropical Cyclone Douglas Update # 4 for July 24th, 2020

HIRSC - Weather Team continues to actively monitor Major Hurricane Douglas (Category 3 with winds of 115 mph) and assessing the potential weather impacts on Hawaii Island. Hurricane Douglas is located 985 miles east-southeast of Hilo, Hawaii Island.


Hurricane Watch and Flash Flood Watch has been issued for the Island of Hawaii ahead of Tropical Cyclone Douglas.


Once Again, We want to remind all of our followers that now is the time to get all personal protection and preparation work completed ahead of Tropical Cyclone Douglas.


HIRSC - Hawaii Island emergency action and operations plans have been activated ahead of the potential impacts from Tropical Cyclone Douglas. HIRSC will be doing a live update beginning this evening (Friday, July 24th @ 9:00 pm) on things happening on Hawaii Island.

Published by: HIRSC - Nevada (Henderson), Utah (St. George), and Weather Teams

info@hiradioscannercommunity.com


Weather Bulletin for Hurricane Douglas (As of 11 am HST - 7/24/2020)

BULLETIN
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
ISLANDS...
...HURRICANE WATCH ISSUED FOR THE BIG ISLAND AND MAUI COUNTY...


SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION
-----------------------------------------------
LOCATION...17.0N 143.5W
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
Honolulu Hawaii.


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
(185 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.

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 ADVISORY
-------------
Next intermediate advisory at 200 PM HST.
Next complete advisory at 500 PM HST.

Tropical Cyclone Outlook for the East Pacific Region (As of 11 am PST - 7/24/2020):

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Fri Jul 24 2020

For the eastern North Pacific...east of 140 degrees west longitude:

1. An area of low pressure could form south of the southern coast of 
Mexico over the weekend or early next week. Any development of this 
system thereafter should be slow to occur while it moves generally 
west-northwestward.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...10 percent.

Preparedness Packet from Hawaii County Civil Defense:


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