(AP) — Tropical Storm Cristobal could soon renew its strength by uniting with another storm system coming from the west to form one giant cyclone, forecasters say.
After drenching much of the South, forecasters expect the remnants of Cristobal to bring fierce winds, heavy rain and thunderstorms to much of the Midwest by Tuesday.
A very strong storm system sweeping out from the Rocky Mountains is expected to meld with Cristobal in the next couple of days, said Greg Carbin, who oversees forecasts at the Weather Prediction Center in College Park, Maryland.
"The two will eventually merge into a large cyclone," Carbin said. "It's a pretty fascinating interaction we'll see over the next couple of days."
Wind gusts of up to 45 mph are expected in Chicago by Tuesday night, the National Weather Service said. Boaters are being warned of gale-force winds on nearby Lake Michigan on Tuesday and Wednesday.
High winds could be felt from Nebraska to Wisconsin, forecasters said. In parts of Iowa, Minnesota and South Dakota, the gusty winds and low humidity will bring the threat of wildfires in areas with dry grass, National Weather Service forecasters warned. Any blazes that start will spread rapidly, they said.
Cristobal weakened into a depression early Monday after inundating coastal Louisiana and ginning up dangerous weather along most of the U.S. Gulf Coast, sending waves crashing over Mississippi beaches, swamping parts of an Alabama island town and spawning a tornado in Florida.
In Louisiana, two boaters were found Monday afternoon in good condition after their boat sank in a deep-water strait near Slidell on Sunday, authorities said.
They told deputies they survived in the water by clinging to one life jacket Sunday afternoon and Sunday night before they were able to reach the shore Monday morning, St. Tammany Parish sheriff's Sgt. Suzanne Carboni said.
They then swam across a marshy area and were found sitting on the porch of a camp, Carboni said.
Heavy rainfall and a storm surge continued threatening a wide area of the Gulf Coast after Cristobal made landfall Sunday afternoon packing 50-mph winds between the mouth of the Mississippi River and the since-evacuated barrier island resort community of Grand Isle.
At 5 p.m. EDT Monday, the storm was centered about 110 miles north of Monroe, Louisiana, with top winds of 35 mph. It was moving north at 18 mph.
Cristobal's remnants could be a rainmaker for days. Its forecast path takes it into Arkansas and Missouri Tuesday, then through Illinois and Wisconsin to the Great Lakes.
"It's very efficient, very tropical rainfall," National Hurricane Center Director Ken Graham said in a Facebook video. "It rains a whole bunch real quick."
In an update on Cristobal from the hurricane center, forecasters said up to 15 inches of rain could fall in some areas, and could cause significant river flooding across the mid and upper Mississippi Valley.
Coastal Mississippi news outlets reported stalled cars and trucks as flood waters inundated beaches and crashed over highways. On the City of Biloxi Facebook page, officials said emergency workers helped dozens of motorists through flood waters, mostly on U.S. 90 along the coast.
In Alabama, the bridge linking the mainland to Dauphin Island was closed much of Sunday but was reopened Monday. Police and state transportation department vehicles led convoys of motorists to and from the island when breaks in the weather permitted.
"The storm could have been a lot worse, I'm very thankful to say. We were largely spared," Louisiana Governor John Bel Edwards said.
Cristobal provided the state with "a good test" of overall hurricane response and preparedness, particularly combined with ongoing Covid-19 response efforts, the governor said.
In Florida, a tornado — the second in two days in the state as the storm approached — uprooted trees and downed power lines Sunday afternoon south of Lake City near Interstate 75, the weather service and authorities said. There were no reports of injuries. The storm also forced a waterlogged stretch of Interstate 10 in north Florida to close for a time Sunday.
By JEFF MARTIN
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