Tropical Storm Calvin strengthened Tuesday as it continued to approach Hawaii’s Big Island

Packing winds of 45 mph, Calvin was about 170 miles southwest of Hilo on Wednesday morning

The storm threatens to deliver strong winds and heavy rainfall that could result in flash flooding and mudslides

Between 4 and 8 inches of rain are expected, with some areas seeing up to 10 inches, mainly along the windward

“Calvin is forecast to pass south of Hawaii County tonight, bringing a period of flash flooding, dangerous surf and damaging winds

Rainfall of 3 to 6 inches are expected on the windward areas of Maui, and 2 to 4 inches of rain could fall elsewhere in the state.

Gov. Josh Green declared a state of emergency Tuesday for the Big Island, where government offices are expected to close Wednesday.