Heidi Androl, a reporter on the UFC’s telecast, says organizers are closely monitoring a line of thunderstorms moving toward Washington, with weather officials focused less on rain than on the threat of high winds and lightning.

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“It is not rain that they are concerned with. It is high winds and lightning. I am told that if that happens, a shelter in place will be initiated.”

According to Androl, UFC security officials have designated shelter locations for every department, with personnel on the South Lawn set to move into the Eisenhower Executive Office Building, which also houses the fighters’ locker rooms.

She added that any shelter-in-place order would be lifted “within 30 minutes of the last lightning strike within a six-mile radius”, though forecasters currently expect conditions to clear by around 9pm.