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BULLETIN
Tropical Storm Calvin Advisory Number  28
NWS Central Pacific Hurricane Center Honolulu HI   EP032023
500 AM HST Tue Jul 18 2023
 
...TROPICAL STORM CALVIN TAKING AIM AT THE BIG ISLAND OF HAWAII 
WITH IMPACTS STARTING THIS EVENING... 


SUMMARY OF 500 AM HST...1500 UTC...INFORMATION
----------------------------------------------
LOCATION...17.5N 149.5W
ABOUT 395 MI...640 KM ESE OF HILO HAWAII
ABOUT 605 MI...975 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 275 DEGREES AT 22 MPH...35 KM/H
MINIMUM CENTRAL PRESSURE...1002 MB...29.59 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, in this case within 
the next 12 to 24 hours.
 
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 500 AM HST (1500 UTC), the center of Tropical Storm Calvin was
located near latitude 17.5 North, longitude 149.5 West. Calvin is
moving toward the west near 22 mph (35 km/h), and this general 
motion is expected to continue over the next few days. On this 
forecast track, tropical storm conditions will likely begin
spreading over Hawaii County starting this evening.
 
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Deep convection has been developing near Calvin early this morning, 
which may slow the weakening trend today. Calvin is forecast to 
gradually weaken from tonight through Thursday.
 
Tropical-storm-force winds extend outward up to 105 miles (165 km)
from the center.
 
The estimated minimum central pressure is 1002 mb (29.59 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. Persons in Hawaii County should
complete preparations for tropical storm force wind impacts 
during daylight hours prior to the onset of tropical storm
conditions tonight.
 
RAINFALL: From later today into Thursday, storm total rainfall
amounts of 4-8 inches, with maximum amounts of 10 inches are
possible, mainly along the windward areas of the Big Island of
Hawaii. Storm total rainfall amounts of 1-4 inches are expected
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 later today and 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
-------------
Next intermediate advisory at 800 AM HST.
Next complete advisory at 1100 AM HST.
 
$$
Forecaster Houston
 
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