On Tuesday, Redskins officials cited the “threat of inclement weather” in announcing they’re rescheduling Friday’s media session, which was to follow a full rookie-minicamp session that’s open to reporters and photographers, to Saturday. With lightning forecast on Friday, there’s no guarantee the team can safely conduct a full on-the-field workout.

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Redskins spokesman Tony Wyllie said that a new indoor facility will be in place this summer. Asked what had caused the delay, Wyllie said, “We don’t know.”

Others with knowledge of the project explained that construction was to have started Monday but was postponed by a 14th consecutive day of rain. The new target for completion, one person said, is June 1 at the latest.

The Redskins’ much-ballyhooed indoor practice facility was added to their Loudoun County complex during Coach Mike Shanahan’s tenure in January 2012. Even before the four-year-old structure collapsed, the Redskins lagged behind many NFL teams and a virtually every major Division I college football team in terms of facilities.

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According to an investigation by The Post’s Will Hobson and Steven Rich, indoor practice facilities were rarities in college football in the 1980s. But in the past 20 years, they’ve become standard amenities among Division I schools with championship aspirations — even those in the south, such as Florida State and the University of Florida.

Maryland soon will join their ranks, embarking on a $155 million project that will convert former basketball arena Cole Field House into an indoor football practice facility, with new locker rooms, football offices, training center for all athletes and an “Academy of Innovation and Entrepreneurship” for students. The project is deemed essential to ensuring that Maryland football is competitive in the Big Ten.

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But even Maryland’s lavish project lacks the amenities of the $55 million complex Clemson is constructing next to its existing indoor practice facility. Plans for Clemson’s project include a miniature golf course, laser tag, bowling lanes, sand volleyball courts and barber shop — enticements that boosters believe will help the public university win the high-stakes recruiting battles.

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That’s a far cry from the Redskins’ indoor practice facility, which doesn’t even include indoor plumbing. Players and coaches share use of a lone Porta John just outside the front door. Nonetheless, the team officials are confident that the new facility, to be constructed on the same site atop the existing artificial turf field, will be plenty to keep the NFC East-champion Redskins competitive.

The Redskins are the NFL’s third-most-valuable NFL franchise, worth $2.8 billion, according to Forbes’ 2015 annual list of team valuations. Only Dallas ($4 billion) and New England ($3.2 billion) are worth more.