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BULLETIN
Tropical Storm Walaka Intermediate Advisory Number 4A
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
800 AM HST Sun Sep 30 2018
 
...WALAKA INTENSIFIES WELL SOUTHWEST OF THE MAIN HAWAIIAN ISLANDS...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
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LOCATION...11.7N 164.6W
ABOUT 490 MI...790 KM SE OF JOHNSTON ISLAND
ABOUT 800 MI...1290 KM SSW OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...W OR 275 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Hurricane Watch is in effect for...
* Johnston Atoll
 
A Hurricane Watch means that hurricane conditions are possible in
the watch area. A watch is typically issued 48 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 800 AM HST (1800 UTC), the center of Tropical Storm Walaka was
located near latitude 11.7 North, longitude 164.6 West. Walaka is
moving toward the west near 16 mph (26 km/h). This motion is
expected to continue through tonight with a decrease in forward
speed, followed by a turn toward the northwest on Monday and a turn
toward the north on Tuesday.
 
Maximum sustained winds are near 60 mph (95 km/h) with higher
gusts. Rapid intensification is forecast over the next couple days,
with Walaka expected to become a hurricane later today.
 
Tropical-storm-force winds extend outward up to 70 miles (110 km)
from the center.
 
The estimated minimum central pressure is 998 mb (29.47 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical Storm force winds are possible across Johnston
Island starting early Tuesday, with Hurricane conditions possible
starting late Tuesday or Tuesday night.
 
SURF: Large surf will affect the Johnston Atoll reefs and shorelines
starting late Tuesday.
 
RAINFALL: Heavy rainfall associated with Walaka may reach Johnston
Atoll by Monday or Monday night.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM HST.
 
$$
Forecaster Powell

 
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