Tropical Storm Imelda is strengthening and is expected to become a hurricane by Tuesday as it moves off the Southeast coast, kicking up dangerous surf, rip currents, coastal flooding and beach erosion from Florida through the Carolinas.

Tropical Storm Imelda is not forecast to make landfall on the coast of the southeastern U.S., but it's expected to bring rain and flooding to the region.

At least four people are dead after torrential rainfall and flooding in Arizona that officials described Saturday as catastrophic. Three of the deaths were in the small community of Globe, Gila County emergency manager Carl Medford told NBC News.

In the rural community of Globe, one of Arizona's oldest mining towns, sheriff deputies are looking into reports of people who may be missing.

Local outlet Arizona Family reported that three people have died, and others are missing after flash flooding, with search-and-rescue crews still combing the area for additional victims.

Due to recent flash flooding in the Globe-Miami area, the Arizona Department of Transportation canceled daytime closures on U.S. 60 between mileposts 227 and 243 that were set for Sept. 30 to Oct. 2.

Search and rescue efforts are ongoing in Globe following severe flooding that impacted the area after Friday's storms.

The Globe Police Department is searching for Pete Green, a man who was reported missing by his sister after massive floods hit the area.