The dominant theory appears to be slightly less weird, if only just; the Republican National Committee's "rapid response director" rapid-responsed his own theory that the photo, taken last Tuesday, was not tweeted on that day because the Iranian military had just launched multiple missiles at U.S. troop in Iraq. "So the WH just saved the tweet for tonight," he tweeted.
So the White House was not reporting the weather; it was just running a weather rerun, so to speak, as news and government outlets are known for doing because it creates absolutely no public problems at all.
This too, however, remains only a theory. The White House, which has no apparent remaining press staff and no apparent ability to clarify what the flying bumplebump goes on even when it comes to decisions to assassinate foreign leaders, much less things like this, a few hours later seemingly attempted to clarify things with a new tweet linking to the White House Flickr page, which more accurately described the picture, but then The Washington Post reports they deleted that clearer tweet in what appears to be an intentional effort to, well, troll the nation because screw you, that's why.
The Post also reports that the White House didn't respond to their request for comment. Whether that is because the White House staff just can't be bothered to return reporter calls or because they are already huddling to figure out what rote task they can weirdly botch next is, as always, unclear.