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Tropical Storm Olivia Intermediate Advisory Number 42A
NWS Central Pacific Hurricane Center Honolulu HI   EP172018
800 PM HST Mon Sep 10 2018
 
...OLIVIA DRAWING CLOSER TO THE MAIN HAWAIIAN ISLANDS...
 
 
SUMMARY OF 800 PM HST...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...22.0N 149.9W
ABOUT 365 MI...585 KM ENE OF HILO HAWAII
ABOUT 515 MI...830 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...991 MB...29.27 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 PM HST (0600 UTC), the center of Tropical Storm Olivia was
located near latitude 22.0 North, longitude 149.9 West. Olivia is
moving toward the west-northwest near 9 mph (15 km/h). A turn to the
west and west-southwest is expected later tonight, with this
general motion continuing for the next couple of days. On the
forecast track, Olivia will be moving over the main Hawaiian Islands
late Tuesday night into Wednesday.
 
Maximum sustained winds are near 70 mph (110 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 across the
islands.
 
Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.
 
The estimated minimum central pressure is 991 mb (29.27 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical storm conditions are expected over Maui County and
the Big Island starting late Tuesday or Tuesday night. Tropical
storm conditions are expected over Oahu starting late Tuesday night
or Wednesday morning. Tropical storm conditions are possible over
Kauai County starting Wednesday afternoon or evening.
 
RAINFALL: Olivia is expected to produce total rainfall accumulations
of 10 to 15 inches, with isolated maximum amounts of 20 inches
possible. This rainfall may produce life-threatening flash flooding.
 
SURF: Large swells generated by Olivia will impact the Hawaiian
Islands over the next couple of days. This will cause surf to
build, mainly along exposed east facing shores, and surf may become
damaging. See the High Surf Warning from National Weather Service
Honolulu for more information.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 PM HST.
 
$$
Forecaster Birchard
 
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