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BULLETIN
Hurricane Walaka Intermediate Advisory Number 12A
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
800 AM HST Tue Oct 02 2018
 
...WALAKA WEAKENS SLIGHTLY BUT REMAINS A DANGEROUS CATEGORY 4
HURRICANE HEADING TOWARD JOHNSTON ATOLL...
 
 
SUMMARY OF 800 AM HST...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...15.1N 170.1W
ABOUT 115 MI...185 KM SSW OF JOHNSTON ATOLL
ABOUT 905 MI...1455 KM WSW OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...150 MPH...240 KM/H
PRESENT MOVEMENT...N OR 355 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...932 MB...27.52 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 Watch is in effect for...
* Papahanaumokuakea Marine National Monument from Nihoa to French
Frigate Shoals to Maro Reef
 
A Hurricane Warning means that hurricane conditions are expected in
the warning area within 36 hours.
 
A Hurricane Watch means that hurricane conditions are possible
within the watch area within 48 hours.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 800 AM HST (1800 UTC), the center of Hurricane Walaka was located
near latitude 15.1 North, longitude 170.1 West. Walaka is moving
toward the north near 10 mph (17 km/h). This general motion is
expected to continue through Wednesday night with a steady increase
in forward speed. On the forecast track, the center of Walaka is
expected to pass just to the west of Johnston later today.
 
Maximum sustained winds are near 150 mph (240 km/h) with higher
gusts.  Walaka is a category 4 hurricane on the Saffir-Simpson
Hurricane Wind Scale. Little change in intensity is expected through
tonight, with rapid weakening expected Wednesday and Wednesday
night.
 
Hurricane-force winds extend outward up to 40 miles (65 km) from
the center and tropical-storm-force winds extend outward up to 185
miles (295 km).
 
The estimated minimum central pressure is 932 mb (27.52 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Tropical storm force winds are already occurring across
Johnston Island, with hurricane conditions expected to begin this
afternoon and last through this evening. Tropical storm force winds
are possible across the Papahanaumokuakea Marine National Monument
from Nihoa to French Frigate Shoals to Maro Reef beginning late
Wednesday, with hurricane conditions possible Wednesday night.
 
SURF: Large surf associated with Walaka will continue to affect the
Johnston Island reefs and shorelines through Wednesday. Large surf
will affect the Papahanaumokuakea Marine National Monument from
Nihoa to French Frigate Shoals to Maro Reef beginning early
Wednesday.
 
RAINFALL: Heavy rainfall associated with Walaka will continue
across Johnston Island through early Wednesday, and may reach
rainfall may reach the Papahanaumokuakea Marine National Monument
from Nihoa to French Frigate Shoals to Maro Reef late tonight or
Wednesday.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM HST.
 
$$
Forecaster Wroe
 
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