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BULLETIN
Tropical Storm Calvin Intermediate Advisory Number 30A
NWS Central Pacific Hurricane Center Honolulu HI   EP032023
800 PM HST Tue Jul 18 2023
 
...TROPICAL STORM CALVIN APPROACHING THE BIG ISLAND...
...IMPACTS IN HAWAII COUNTY ARE IMMINENT...
 
 
SUMMARY OF 800 PM HST...0600 UTC...INFORMATION
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LOCATION...17.8N 154.1W
ABOUT 150 MI...240 KM SSE OF HILO HAWAII
ABOUT 350 MI...565 KM SE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...W OR 275 DEGREES AT 21 MPH...33 KM/H
MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
 
A Tropical Storm Warning is in effect for...
* Hawaii County
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
 
Interests elsewhere in Hawaii should monitor the progress of
Calvin.
 
For storm information specific to your area, please monitor
products issued by the National Weather Service office in
Honolulu Hawaii.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 800 PM HST (0600 UTC), the center of Tropical Storm Calvin was
located near latitude 17.8 North, longitude 154.1 West. Calvin is
moving toward the west near 21 mph (33 km/h), and this general
motion is expected to continue over the next few days. On the
forecast track, tropical storm conditions are imminent and will 
spread over Hawaii County this evening.
 
Maximum sustained winds are near 60 mph (95 km/h) with higher
gusts. Calvin is expected to remain a tropical storm over the next
36 hours, and then will weaken quickly afterward.
 
Tropical-storm-force winds extend outward up to 140 miles (220 km)
from the center.
 
The estimated minimum central pressure is 1003 mb (29.62 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Calvin can be found in the Tropical Cyclone
Discussion under AWIPS header TCDCP1 and WMO header WTPA41 PHFO.
and on the web at hurricanes.gov/text/HFOTCDCP1.shtml
 
WIND: Tropical storm conditions are expected within the warning
area starting this evening. Preparations for tropical storm
force wind impacts should already be completed for persons
in Hawaii County.
 
RAINFALL: Storm total rainfall amounts through Thursday are
forecasted to be 4-8 inches, with maximum amounts of 10 inches
possible, mainly along the windward slopes and southeast flank of
the Big Island of Hawaii. Storm total rainfall amounts of 3-6 inches
are expected on the windward areas of Maui, and 2-4 inches elsewhere
in the state. This rainfall could lead to localized flash flooding
and mudslides.
 
SURF: Swells generated by Calvin are expected to begin spreading
across the main Hawaiian Islands tonight. This will lead to a rapid
increase in surf along east facing shores, with high surf continuing
into Wednesday. This elevated surf will likely cause
life-threatening conditions along exposed shorelines. Please consult
products from your local weather office for details.
 
 
NEXT ADVISORY
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Next complete advisory at 1100 PM HST.
 
$$
Forecaster Powell
 
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