From Belmopan... 11:30 BZT
The wind bringing or making the cloud over Belize is coming from North Guatamala. . . . .Even though the surface wind is from the Caribbean East.
Clouds often builds up in the late afternoon, as temperatures drop, particularly along the Guatemalan Pacific coast line. . . . .. .But this close is different, I strongly suspect it is being formed from, or caused by the fire smoke in North Guatamala.