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Forecasting the chance of thunderstorms dumping water on the UFC Freedom 250 event to be held outside the White House on June 14 requires a simple exercise, according to Jennifer Gray of the Weather Channel.“It's like a flip of a coin at this point. Or maybe 40 (percent),’’ Gray told USA TODAY Sports on Sunday, June 7. “I'm looking at my maps right now. Starting around Wednesday into Thursday, we really keep storms in place across the East every single day through at least Saturday night. And I don't see anything that would really stop that from happening on Sunday.’’Gray said the forecast will be more accurate by the middle of next week. “But as of right now, I couldn't promise you clear skies and comfortable temperatures for Sunday (June 14) because I'm just not super confident that that's how it's going to play out.’’The fights at UFC Freedom 250 are scheduled to start at 8 p.m. ET at the temporary venue outside the White House. As for the roughly 4,000 people expected to assemble there, Gray said, “Hopefully they'll have a plan to get them to shelter if need be, because we do know that these thunderstorms can turn dangerous very quickly.’The arena, which has been assembled on the South Lawn of the White House, will be topped by a canopy, according to ESPN and multiple other published reports. About 85,000 people are expected to watch the fights on large screens at the Ellipse, a national park across the street from the White House.Alex DaSilva of AccuWeather said the current forecast for Jun 14 in Washington D.C. is “dry.’’ Nonetheless, he said he thinks there’s a 20% to 30% chance of rain.“The forecast models that I'm looking at this very moment show that D.C. is clear on Sunday,'' DaSilva said. "But considering how we've been hot and stormy and the heat's been fueling these summertime storms, can't rule it out either.’’But DaSilva also said, “It doesn't look like it's going to be a washout or anything like that. But there definitely is that risk of an afternoon thunderstorm coming by.’’As for temperature when the fights start, Gray said, “Temperatures won't be in the mid-90s, but it could be pretty sticky and humid still during that time.’’