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Tropical Storm Olivia Intermediate Advisory Number 46A
NWS Central Pacific Hurricane Center Honolulu HI EP172018
800 PM HST Tue Sep 11 2018
...OLIVIA SLOWS DOWN BUT STILL MOVING TOWARD MAUI COUNTY AND THE BIG
SUMMARY OF 800 PM HST...0600 UTC...INFORMATION
ABOUT 85 MI...135 KM NE OF HILO HAWAII
ABOUT 230 MI...370 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...SW OR 235 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Kauai County...including the islands of Kauai and Niihau
* Maui County...including the islands of Maui, Molokai, Lanai, and
* Hawaii County
Interests in the Northwest Hawaiian Islands should monitor the
progress of Olivia.
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere in the warning area within 36 hours.
For storm information specific to your area, please monitor
products issued by the National Weather Service office in
DISCUSSION AND OUTLOOK
At 800 PM HST (0600 UTC), the center of Tropical Storm Olivia was
located near latitude 20.8 North, longitude 154.4 West. Olivia's
forward speed has slowed once again, and it is moving toward the
southwest near 8 mph (13 km/h). A general west-southwest motion and
a gradual increase in forward speed is expected overnight as the
center of Olivia approaches Maui and the Big Island. After Olivia
moves past the islands, a somewhat faster west-southwest motion is
expected to resume and continue for the next couple of days.
Maximum sustained winds are near 50 mph (85 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
main Hawaiian Islands.
Tropical-storm-force winds extend outward up to 105 miles (165 km),
mainly to the north of the center.
The estimated minimum central pressure is 1003 mb (29.62 inches).
HAZARDS AFFECTING LAND
WIND: Tropical storm conditions are expected over portions of
Maui County and the Big Island starting tonight. Tropical
storm conditions are expected to begin over Oahu early Wednesday.
Tropical storm conditions are expected over Kauai County starting
later Wednesday. Remember that wind gusts can be much stronger near
higher terrain, particularly through gaps between mountains and
where winds blow downslope.
RAINFALL: Showers will continue to increase over portions of the
main Hawaiian Islands tonight and Wednesday. 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 complete advisory at 1100 PM HST.