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Tropical Storm Olivia Intermediate Advisory Number 44A
NWS Central Pacific Hurricane Center Honolulu HI   EP172018
800 AM HST Tue Sep 11 2018
 
...OUTERMOST SHOWER BANDS ASSOCIATED WITH TROPICAL STORM OLIVIA
GRADUALLY SPREADING ACROSS THE MAIN HAWAIIAN ISLANDS...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...21.6N 151.9W
ABOUT 240 MI...385 KM ENE OF KAHULUI HAWAII
ABOUT 380 MI...610 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...65 MPH...105 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Tropical Storm Warning is in effect for...
* Oahu
* Maui County...including the islands of Maui, Molokai, Lanai, and
Kahoolawe
* Hawaii County
 
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 in the warning area within 36 hours.
 
A Tropical Storm Watch means that tropical storm conditions are
possible in the watch area within 48 hours.
 
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), the center of Tropical Storm Olivia was
located near latitude 21.6 North, longitude 151.9 West. Olivia is
moving toward the west near 10 mph (17 km/h). A turn to the
west-southwest is expected later today, with a slight increase in
forward speed. This general motion will then continue for the next
couple of days. On the forecast track, the center of Olivia will be
moving the main Hawaiian Islands late tonight into Wednesday.
 
Maximum sustained winds are near 65 mph (105 km/h) with higher
gusts. Gradual weakening is forecast during the next 48 hours, but
Olivia is expected to remain a tropical storm as it moves over the
islands.
 
Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.
 
The estimated minimum central pressure is 999 mb (29.50 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical storm conditions are expected over Maui County and
the Big Island starting tonight. Tropical storm conditions are
expected over Oahu starting Wednesday morning. Tropical storm
conditions are possible over Kauai County starting Wednesday
afternoon or evening.
 
RAINFALL: Showers will continue to gradually increase over portions
of the main Hawaiian Islands today ahead of Tropical Storm Olivia.
Olivia is expected to produce total rainfall accumulations of 5 to
10 inches in some areas, with isolated maximum amounts of 15 inches
possible, especially in higher terrain. This rainfall may produce
life-threatening flash flooding.
 
SURF: Large swells generated by Olivia will impact the main Hawaiian
Islands over the next couple of days. This will result in
dangerously high and potentially damaging surf, mainly along
exposed east facing shores.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM HST.
 
$$
Forecaster R Ballard
 
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