UPDATE: 11 p.m.

Tropical Storm Calvin continues to churn westward toward Hawaii island with heavy rain expected beginning Tuesday night.

A tropical storm warning remains in effect for the island. Tropical storm conditions are expected in the warning area within 36 hours.

“Calvin is forecast to pass over or very close to Hawaii County Tuesday night, bringing a period of heavy rain, high surf and locally strong winds,” the Central Pacific Hurricane Center said. “Calvin is expected to weaken as it moves westward to the south of the other Hawaiian Islands Wednesday and Wednesday night, bringing the potential for some peripheral impacts.”

The Big Island could see as much as 10 inches of rain, mainly among the windward areas. Other islands are expected to get between 1 and 4 inches, forecasters said. The rainfall could lead to localized flash flooding, mudslides and damaging winds.

Maximum sustained winds are near 45 mph with higher gusts as it moves west at 22 mph.

As of the 11 p.m. update, Calvin was located about 520 miles east-southeast of Hilo and about 730 miles east-southeast of Honolulu.

Swells generated by Calvin are expected to begin spreading across the Hawaiian Islands late Tuesday. A rapid increase in surf is expected along east-facing shorelines exposed to those swells from Tuesday night into Wednesday.

The next updates will be released at 2 a.m. and 5 a.m.

UPDATE: 8 p.m.

Tropical Storm Calvin continues to moves rapidly westward toward Hawaii island.

A tropical storm warning remains in effect for the Big Island. That tropical storm conditions are expected in the warning area within 36 hours.

As of the 8 p.m. update, Calvin was located about 570 miles east-southeast of Hilo and about 780 miles east-southeast of Honolulu.

Calvin’s maximum sustained winds continued at 45 mph with higher gusts as it moves west at 21 mph.

On its current track, tropical storm conditions are expected to start spreading over Hawaii County starting Tuesday night, with tropical-storm-force winds extending outward up to 105 miles from the center.

The Big Island could see as much as 10 inches of rain, with the other islands getting between 1 and 4 inches.

“This rainfall could lead to localized flash flooding and mudslides,” forecasters said.

Swells generated by Calvin are expected to spread the main Hawaiian Islands tomorrow, with a rapid increase in surf along east facing shorelines exposed to these swells Tuesday and Wednesday.

“This elevated surf will likely cause life-threatening conditions along exposed shorelines.”

Calvin is forecast to gradually weaken during the next several days.

UPDATE: 5 p.m.

Hawaii County is now under a tropical storm warning as Calvin advances in a westward direction.

A tropical storm warning means that tropical storm conditions are expected in the warning area within 36 hours.

As of the 5 p.m. update, Calvin was located about 655 miles east-southeast of Hilo and about 855 miles east-southeast of Honolulu.

Calvin’s maximum sustained winds dropped to 45 mph with higher gusts as it continued moving west at 22 mph.

Tropical storm conditions are expected over Hawaii County beginning Tuesday night, bringing heavy rain, high surf and strong winds. Calvin will gradually weaken as it moves westward to the south of other Hawaiian Islands on Wednesday, forecasters said.

“From Tuesday night 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,” forecasters said. “Storm total rainfall amounts of 1-4 inches are expected elsewhere in the state. This rainfall could lead to localized flash flooding and mudslides.”

Calvin is expected to generate swells that will reach the main Hawaiian Islands over the next couple of days.

“A rapid increase in surf is expected Tuesday and Wednesday. This surf will likely cause life-threatening surf along exposed east-facing shores,” forecasters said.

Tropical-storm-force winds extend outward up to 105 miles from the center.

The next updates will be released at 8 p.m. and 11 p.m.

2 p.m.

Tropical Storm Calvin is moving rapidly westward as it continues to track toward Hawaii island which remains under a tropical storm watch.

A tropical storm watch means tropical storm conditions are possible within the watch area over the next 36 to 48 hours.

As of 2 p.m., Calvin was located about 710 miles east of Hilo and about 920 miles east-southeast of Honolulu.

Calvin was packing maximum sustained winds of 50 mph with higher gusts as it moved toward the west near 22 mph.

A weakening Calvin is expected to bring high surf, heavy rain and gusty winds to the Hawaiian Islands on Tuesday.

Tropical-storm-force winds extend outward up to 125 miles from the center.

The next forecast update is expected at 5 p.m. today.

11 a.m.

A tropical storm watch remains in effect for the Big Island as Calvin is expected to bring rainfall to the windward areas of Hawaii County and other Hawaiian Islands starting Tuesday.

Calvin was located about 790 miles east of Hilo and 990 miles east-southeast of Honolulu as of 11 a.m.

A tropical storm watch means tropical storm conditions are possible within the watch area over the next 36 to 48 hours.

“From Tuesday night into Thursday, storm total rainfall amounts of 4-8 inches are possible along windward areas of the Big Island of Hawaii, with lower amounts (1-4 inches) expected elsewhere in the state. This rainfall could lead to localized flash flooding and mudslides,” forecasters said.

Calvin was packing maximum sustained winds of 50 mph with higher gusts as it moved toward the west near 21 mph. Calvin is forecasted to continue in the same motion and gradually weaken as it moves westward to the south of the other Hawaiian Islands on Wednesday.

“On the forecast track, Calvin is expected to approach the main Hawaiian Islands on Tuesday, with tropical storm conditions possible over some areas starting Tuesday night,” forecasters said.

In addition to heavy rain and strong winds, Calvin is expected to generate swells that will reach the main Hawaiian Islands over the next couple of days.

“A rapid increase in surf is expected Tuesday and Wednesday. This surf will likely cause life-threatening surf along exposed east-facing shores,” forecasters said.

Tropical-storm-force winds extend outward up to 125 miles from the center.

PREVIOUS COVERAGE

A tropical storm watch was issued this morning for Hawaii island and its surrounding waters as Calvin becomes the first tropical cyclone in the Central Pacific of the 2023 hurricane season.

A watch means that tropical storm conditions are possible within the next 36 to 48 hours.

The National Weather Service has also issued a flood watch for Maui County and Hawaii island from Tuesday evening through Wednesday afternoon.

Before 5 a.m. today, the Central Pacific Hurricane Center on Oahu said Tropical Storm Calvin had maximum sustained winds of 50 mph and was about 920 miles east of Hilo and 1,120 miles east-southeast of Honolulu, moving west at 18 mph. This general motion is expected in the next few days, officials said. Tropical storm-force winds extend up to 105 miles from the center.

“Calvin is expected to approach the main Hawaiian islands on Tuesday and early Wednesday,” the CPHC said this morning.

According to the latest five-day track, Calvin will move near or pass just south of the Big Island early Wednesday, with maximum sustained winds of 40 mph, then pass south of the other islands as a weakening tropical depression into early Thursday.

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Forecasters said that total rainfall amounts of 4 to 7 inches are possible along windward areas of the Big Island from Tuesday night into Thursday, with 1 to 4 inches expected elsewhere in the state. “This rainfall could lead to localized flash flooding and mudslides,” officials said.

Calvin “will produce periods of heavy rainfall over all islands in Maui and Hawaii counties from Tuesday evening through Wednesday afternoon. Excessive rainfall may lead to flooding conditions and landslides over steep terrain, especially along east- and southeast-facing slopes,” officials said.

In addition, swells generated by Calvin are expected to begin reaching the main islands over the next couple of days, causing life-threatening surf, they said.

In the Hawaii island tropical storm watch, officials said the public can expect:

>> Rapidly building surf Tuesday night through Wednesday, with surf heights reaching advisory levels for most windward coasts and warning levels (greater than 15 feet) along eastern shores.

>> Locally strong winds may begin as early as Tuesday evening across parts of the Big Island, with north winds shifting to the northeast and east as Calvin moves westward.

Winds will primarily be northeasterly over the smaller islands, with the strongest throughout Wednesday. Mountainous terrains can also produce localized enhanced winds, far from the tropical cyclone center, officials said.