ZCZC HFOTCPCP1 ALL
TTAA00 PHFO DDHHMM
 
BULLETIN
Tropical Storm Walaka Advisory Number   4
NWS Central Pacific Hurricane Center Honolulu HI   CP012018
500 AM HST Sun Sep 30 2018
 
...WALAKA INTENSIFIES WELL SOUTHWEST OF THE MAIN HAWAIIAN ISLANDS...
 
 
SUMMARY OF 500 AM HST...1500 UTC...INFORMATION
----------------------------------------------
LOCATION...11.7N 163.9W
ABOUT 510 MI...820 KM SE OF JOHNSTON ISLAND
ABOUT 770 MI...1245 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:
 
A Hurricane Watch has been issued for Johnston Atoll.
 
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 500 AM HST (1500 UTC), the center of Tropical Storm Walaka was
located near latitude 11.7 North, longitude 163.9 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 intermediate advisory at 800 AM HST.
Next complete advisory at 1100 AM HST.
 
$$
Forecaster Jelsema
 
NNNN