- NEW: Fourth of July will be either hot or wet for two regions of country
- NEW: Extreme heat will continue in Southwest, but rain will drench Southeast
- The Pacific Northwest will get a break from blazing temperatures
- Arizona's massive wildfire could get rain, but also wind gusts and lightning
(CNN) -- It'll be firecracker hot in the Southwest on the Fourth of July, but the Southeast and Ohio River Valley will be so drenched that floods are possible.
Meanwhile, the Northeast will get a reprieve from storms that left knee-deep flooding in some areas.
"The most widespread showers and thunderstorms on Thursday will be from the central Gulf Coast northward into the Ohio River Valley," the National Weather Service said. "There is a slight risk of excessive rainfall/flash flooding across much of the Southeast through Wednesday."
East Coast faces wet and wild Fourth 
Smoke from the Yarnell Hill Fire is visible from a distance on a road to Yarnell, Arizona, on Monday, July 1. The wildfire started Friday, June 28, near Yarnell, apparently because of lightning strikes. Extreme heat is hindering efforts to stop the fire, which has scorched more than 8,400 acres. Nineteen firefighters were killed on Sunday, June 30, battling the blaze. 
Local firefighters embrace July 1 at a Prescott, Arizona, memorial service for the 19 firefighters killed in the Yarnell Hill Fire, northwest of Phoenix. 
A couple embraces during the Prescott memorial service for the fallen fighters on July 1. The elite team members' deaths on Sunday, June 30, marked the deadliest day for firefighters since the 9/11 attacks. 
Members of the community give a standing ovation as local firefighters arrive at the July 1 memorial service at Embry-Riddle Aeronautical University in Prescott. 
Toby Schultz lays flowers on July 1 at the fence of the fire station in Prescott, Arizona, the home base of 19 firefighters who died in the Yarnell Hill Fire. 
Flowers hang on the fence outside the Granite Mountain Hot Shot Crew fire station on July 1. 
Homes burn on Sunday, June 30, in Glenn Ilah, Arizona, near Yarnell. 
A home burns in Yarnell, Arizona, on Sunday, June 30. 
Prescott, Arizona, Fire Chief Dan Fraijo gives a news conference in Prescott confirming that 19 firefighters died while fighting the Yarnell Hill Fire on June 30. 
A wildfire destroys homes in the Glenn Ilah area near Yarnell on June 30. 
A wildfire burns homes near Yarnell on June 30. 
Tanker 910 makes a retardant drop on the Yarnell Hill Fire to help protect the Double Bar A Ranch near Peeples Valley on June 30. 
Firefighters move away from the Yarnell Hill Fire, near the town of Yarnell on June 30. 
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Photos: Arizona wildfire 
When will record-breaking heat wave end? As the wet weather system moves up toward the Midwest, the relatively cool temperatures along the East Coast will give way to more summer-like conditions in the Mid-Atlantic and Northeast.
As temperatures sizzle, fireworks even more risky
Still sweating in the West
But the East Coast warm-up will have nothing on the oppressive heat wave scorching the West Coast.
While the Pacific Northwest will get some relief, "extreme heat will continue across the Western states, especially the Southwest," the weather service said.
Cities in California, Nevada and Arizona have already suffered through heat topping 120 degrees in the past few days.
The heat was so torrid in Idaho that Boise residents could bake cookies without an oven.
CNN affiliate KTVB placed a pan of chocolate chip cookie dough on the dashboard of a car. Within a few hours, the cookies were fully baked -- and even overcooked.
Forecasters in Las Vegas noted that a similar heat wave in 2005 killed 17 people. They urged neighbors and relatives to check on those most susceptible to heat-related illness -- children, the elderly and the chronically ill.
Relief and trouble in Arizona
The extreme heat continues to wreak havoc for firefighters trying to stop Arizona's Yarnell Hill wildfire, which has scorched more than 8,400 acres, about 13 square miles of land.
By Wednesday afternoon, the fire was 8% contained. Officials estimated the blaze might not be contained until July 12.
The fire killed 19 members of an elite firefighting squad on Sunday when fierce, erratic winds whipped flames in different directions. Parched land from Arizona's drought has added fuel to the fire.
The possibility of thunderstorms this week could drizzle much needed rain over the fire. But storms could also bring two serious dangers: wind gusts of up to 20 mph and lightning, the suspected cause of the inferno.
CNN's Tina Burnside and Michael Martinez contributed to this report.
Source: southwest - Google News http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNGdVNYvfjo4JZu98KxBHELfk9mJSQ&url=http://www.cnn.com/2013/07/03/us/extreme-weather/
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