ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM 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 ---------------------------------------------- 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 ------------- Next complete advisory at 1100 PM HST. $$ Forecaster Powell NNNN