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BULLETIN
Hurricane Walaka Advisory Number   6
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
500 PM HST Sun Sep 30 2018
 
...WALAKA STRENGTHENS TO A HURRICANE FAR SOUTHWEST OF HAWAII...
 
 
SUMMARY OF 500 PM HST...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...11.9N 166.4W
ABOUT 390 MI...630 KM SSE OF JOHNSTON ISLAND
ABOUT 860 MI...1380 KM SW OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
A Hurricane Warning is now in effect for Johnston Atoll.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Hurricane Warning is in effect for...
* Johnston Atoll
 
A Hurricane Warning means that hurricane conditions are expected in
the warning area. A warning is typically issued 36 hours before the
anticipated first occurrence of tropical-storm force winds,
conditions that make outside preparations difficult or dangerous.
 
Interests in the Papahanaumokuakea Marine National Monument should
monitor the progress of Walaka.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 500 PM HST (0300 UTC), the center of Hurricane Walaka was located
near latitude 11.9 North, longitude 166.4 West. Walaka is moving
toward the west near 12 mph (19 km/h) and this motion is expected to
slow and become northwest on Monday, then north on Tuesday.
 
Maximum sustained winds are near 75 mph (120 km/h) with higher
gusts. Rapid intensification is forecast through Tuesday.
 
Hurricane-force winds extend outward up to 25 miles (35 km) from the
center and tropical-storm-force winds extend outward up to 90 miles
(150 km).
 
The estimated minimum central pressure is 988 mb (29.18 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical Storm force winds are expected across Johnston Island
starting early Tuesday, with Hurricane conditions expected by
Tuesday afternoon.
 
SURF: Large surf will affect the Johnston Atoll reefs and shorelines
starting Tuesday.
 
RAINFALL: Heavy rainfall associated with Walaka may reach Johnston
Atoll by Monday or Monday night.
 
 
NEXT ADVISORY
-------------
Next intermediate advisory at 800 PM HST.
Next complete advisory at 1100 PM HST.
 
$$
Forecaster Powell
 
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