WTPA31 PHFO 011756
TCPCP1
 
BULLETIN
Hurricane Walaka Intermediate Advisory Number 8A
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
800 AM HST Mon Oct 01 2018
 
...WALAKA REACHES CATEGORY 4 STATUS FAR SOUTHWEST OF HAWAII...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...12.6N 168.9W
ABOUT 290 MI...465 KM S OF JOHNSTON ISLAND
ABOUT 940 MI...1510 KM SW OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...145 MPH...235 KM/H
PRESENT MOVEMENT...WNW OR 295 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...935 MB...27.61 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
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 800 AM HST (1800 UTC), the center of Hurricane Walaka was located
near latitude 12.6 North, longitude 168.9 West. Walaka is moving
toward the west-northwest near 10 mph (17 km/h). A turn toward the
northwest is expected to begin later today, followed by a turn
toward the north late tonight through Tuesday night with a gradual
increase in forward speed.
 
Maximum sustained winds are near 145 mph (235 km/h) with higher
gusts.  Walaka is a category 4 hurricane on the Saffir-Simpson
Hurricane Wind Scale. Rapid intensification is expected to continue
today into tonight, with little change in intensity forecast Tuesday
and Tuesday night.
 
Hurricane-force winds extend outward up to 35 miles (55 km) from
the center and tropical-storm-force winds extend outward up to 140
miles (220 km).
 
The estimated minimum central pressure is 935 mb (27.61 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical Storm force winds are expected across Johnston Island
starting late tonight or early Tuesday, with Hurricane conditions
expected by Tuesday afternoon.
 
SURF: Large surf will affect the Johnston Atoll reefs and shorelines
starting later today.
 
RAINFALL: Heavy rainfall associated with Walaka is expected to reach
Johnston Atoll late today or tonight.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM HST.
 
$$
Forecaster Kodama