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BULLETIN
Hurricane Walaka Intermediate Advisory Number 15A
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
200 AM HST Wed Oct 03 2018
 
...DANGEROUS HURRICANE WALAKA INTENSIFIES AS IT MOVES RAPIDLY 
NORTH TOWARD THE PAPAHANAUMOKUAKEA MARINE NATIONAL MONUMENT...
...JOHNSTON ATOLL REMAINS IN THE SOUTH QUADRANT OF WALAKA...
 
 
SUMMARY OF 200 AM HST...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...18.9N 169.8W
ABOUT 150 MI...240 KM N OF JOHNSTON ISLAND
ABOUT 410 MI...660 KM SW OF FRENCH FRIGATE SHOALS
MAXIMUM SUSTAINED WINDS...140 MPH...225 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 14 MPH...23 KM/H
MINIMUM CENTRAL PRESSURE...944 MB...27.88 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
* Papahanaumokuakea Marine National Monument from French Frigate
Shoals to Maro Reef
 
A Tropical Storm Warning is in effect for...
* Papahanaumokuakea Marine National Monument from Nihoa to French
Frigate Shoals
 
A Hurricane Warning indicates that hurricane conditions are expected
in the warning area starting later today or tonight.
 
A Tropical Storm Warning indicates that tropical storm conditions
are expected within the warning area starting later today or
tonight.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 200 AM HST (1200 UTC), the center of Hurricane Walaka was located
near latitude 18.9 North, longitude 169.8 West. Walaka is moving
toward the north near 14 mph (23 km/h), and it is expected to turn
toward the north-northeast with a faster forward motion later today
and tonight. Walaka is forecast to turn toward the north with a
slower forward speed starting Thursday. On this forecast track, the
center of Walaka will likely reach the Papahanaumokuakea Marine
National Monument tonight.
 
Maximum sustained winds are now near 140 mph (225 km/h) with higher
gusts. Walaka remains a dangerous category 4 hurricane on the
Saffir-Simpson Hurricane Wind Scale. Some gradual weakening is
possible starting from today or tonight through Thursday, but Walaka
is forecast to remain a powerful hurricane when it crosses the
Papahanaumokuakea Marine National Monument tonight.
 
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 944 mb (27.88 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
WIND: Hurricane conditions will persist on Johnston Atoll this
morning, with conditions gradually improving later today. Tropical
storm force winds are expected across the Papahanaumokuakea Marine
National Monument from Nihoa to French Frigate Shoals to Maro Reef
beginning this afternoon, with hurricane conditions expected over
portions of the area between French Frigate Shoals and Maro Reef
starting later today or tonight.
 
SURF: Large surf associated with Walaka will continue to affect
Johnston Atoll today. Large surf will likely begin to impact the
Papahanaumokuakea Marine National Monument in a few hours. These
large waves will likely inundate some of the low-lying atolls,
especially from French Frigate Shoals to Maro Reef.
 
RAINFALL: Torrential rainfall associated with Walaka will continue
across Johnston Atoll this morning, and will likely begin to
spread across the Papahanaumokuakea Marine National Monument from
Nihoa to French Frigate Shoals to Maro Reef later today, and
continue through tonight.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 500 AM HST.
 
$$
Forecaster Houston
 
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