259 WTPA31 PHFO 181440 TCPCP1 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