Hawaiians are already reeling from the impact of Lane, which battered the islands with torrential rain over the weekend.
The storm causing record levels of flash flooding with almost 45 inches of rain falling in some parts of Big Island.
Weather forecasters have predicted Miriam will become a Category-2 hurricane with 100mph (160kph) winds before the end of the week.
Miriam has grown “a little stronger” with maximum wind speeds to 65 mph, the National Oceanic and Atmospheric Administration (NOAA) said in its latest update.
The storm was located 1,165 miles east of Hilo Hawaii, at 10am BST (2am Hawaii time), moving at 13mph.
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It is expected to miss Hawaii but may bring choppy seas to the east side of Hawaii’s islands.
Will tropical storm Norman become a hurricane?
Even more worrying than Miriam is tropical storm Norman following directly behind.
“Rapid strengthening is forecast during the next 48 hours, and Norman is expected to become a hurricane later today, and possibly a major hurricane on Thursday,” NOAA warned in its latest update at 10am BST.
Located about 480 miles (770km) south of Baja, California, Norman registered 60mph winds.
It is on a westward or west-southwestward motion over the next few days and is moving at 10mph.
Is it still raining in Hawaii?
Rainfall was still high on Kaui, falling at a rate of 23.79 inches in Mount Waialeale over a 30 hour period between August 27 and 28.
Flash flood warnings were lifted earlier today but were in place across Kauai and Oahu yesterday.
Oahu is Honolulu’s capital and is home to 70 percent of Hawaii’s residents.
An estimated 1.4 million people live there.
Flood responses were ongoing and roads continued to be impacted by flooding and landslides, The Hawaii Department of Transportation said it its latest update.
Kauai resident Micco Godinez said he found the only route out of Hanalei where he lives, blocked by police on Tuesday.
Godinez said he expected to locked in for another day, saying: “I can’t get out at all.
“Our little community of Hanalei is isolated and then west of us is even more isolated,” he said.