I think you're on the right track that it's a timetable. Things to watch for… a countdown.
CENTCOM posted the bunker story on Facebook on Mar 24.
Not sure about Forest, a few ideas have been posted.
Blue = FLOTUS tweet
1, 2, 3 - then april showers? Trump clearly emphasized "starting April 3" the other day.
If this is correct then all the clues will be the same pattern - official tweets/posts by military or high ranking gov officials.