A sharp cold front is ushering in some of the coldest temperatures on record for the month of May in the southern Plains and into Texas, with temperatures plummeting from the mid-90s on Tuesday in Amarillo, Texas, to the upper 20s on Wednesday night.
Houston may be in line to set a record for the coldest May day on record if the low temperature on Friday or Saturday morning falls to 43°F.
These before and after images showing the profound temperature change as the cold air sags south, toward the Gulf of Mexico. Thee images come from computer-model projections: