It’s fitting that this rainy summer will wash out parts of summer’s biggest event.

Metro Atlanta is under a flash flood watch through Friday morning. Not good for the fireworks guys or the backyard party planners.

“It’s a tropical air mass of Caribbean origin,” says WSB meteorologist Kirk Mellish. “It’s linking all the way down past Cuba and lifting moisture into the Atlanta area for the next couple of days.”

With rain almost certain for the Fourth many organizers have already cancelled their events and the AJC Peachtree Road is expected to be a slog.

The rain will move in Wednesday with scattered showers and thunder storms. That will become more widespread and heavier in the afternoon and evening. The good news is it will be a littler cooler with highs around 80.

The rain chance shoots up to 90 percent during the day Thursday and then drops slightly to 80 percent during the evening, says Mellish. Highs will be around 77 and lows near 70.

The rain chance stays at 70 percent for Friday with high temperatures holding near 80.

Mellish says rainfall will average 2 inches with isolated 4 inch totals possible by Friday morning.

The good news is, Mellish expects the rain coverage to diminish on the weekend. There is a 40 percent chance of showers and storms Saturday with highs in the low-80s.

Sunday should be a typical June day. Mellish expects partly cloudy skies and just a 30% chance of a shower or thunderstorm afternoon or evening and highs around 84. So that might be the best time to make up your Independence Day celebration.

Fourth of July events cancelled already

The city of Sugar Hill was one of the first towns to bag their Fourth plans. Their event draws about 10,000 people but officials postponed it because of the threat of severe weather.

"It was just going to be dangers to have 10,000 people in here. You can't move very fast if something happens. It's just going to be a catastrophe," city manager Bob Hail told Channel 2 Action News.

Hail says the event will now take place on Aug. 3 as a back-to-school celebration.

As for the fireworks at Centennial Olympic Park, “we hope to have Fourth of July as planned,” says Joe Skopitz, the Park’s assistant general manager.

Rain now the fireworks are set to go off at 9:45 p.m., but Skopitz admits they might have to change that due to the weather.

“We think we have a window of a half-hour before and after that 9:45 start time that if we did have to work the fireworks we do have a little bit of flexibility,” said Skopitz.

Other jurisdictions that are postponing their celebrations are Covington, Calhoun, Dahlonega, Ellijay, Heard County, Helen, Kennesaw, Lilburn, Oxford and Villa Rica. Click here for more information.

Peachtree Road Race to be wet

Rain hasn’t been a problem for organizers of the AJC Peachtree Road Race in several years. Usually the only moisture in the air is the humidity.

But for the 44th running of the race, organizers are planning for a worst-case scenario.

Race director Tracey Russell says they are in contact with the National Weather Service and emergency management.

"It depends on where in the city it's happening so I think rather than put out too much information, if it ends up raining, we are going to have the event," Russell said.

"Thunder and lightning, inclement weather would cause us to make some changes at the start. Again, all of those decisions will be made collectively," Russell added.

But experienced runners are ready to deal with the rain.

"My new shoes are made just for running puddles, stuff like that. No problem," runner Jaron Brown said.

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