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Tropical Storm Olivia Advisory Number 47
NWS Central Pacific Hurricane Center Honolulu HI EP172018
1100 PM HST Tue Sep 11 2018
...SLOW-MOVING OLIVIA LURKING JUST EAST OF MAUI...
SUMMARY OF 1100 PM HST...0900 UTC...INFORMATION
ABOUT 125 MI...200 KM E OF KAHULUI HAWAII
ABOUT 215 MI...345 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...WSW OR 250 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warning for Kauai and Niihau is discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* 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.
For storm information specific to your area, please monitor
products issued by the National Weather Service office in
DISCUSSION AND OUTLOOK
At 1100 PM HST (0900 UTC), the center of Tropical Storm Olivia was
located near latitude 20.8 North, longitude 154.6 West. Olivia is
moving toward the west-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 45 mph (75 km/h) with higher gusts.
Some weakening is forecast during the next 48 hour, but Olivia is
expected to remain a tropical storm for the next day or so.
Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center, mainly to the north of the center.
The estimated minimum central pressure is 1005 mb (29.68 inches).
HAZARDS AFFECTING LAND
WIND: Tropical storm conditions are expected over portions of
Maui County and the Big Island overnight and Wednesday. Tropical
storm conditions are expected to begin over Oahu early Wednesday.
Remember that wind gusts can be much stronger near higher terrain,
and in the upper floors of high-rise buildings. Winds can also be
especially gusty through gaps between mountains and where winds blow
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 intermediate advisory at 200 AM HST.
Next complete advisory at 500 AM HST.