The weather forecast is calling for the first significant rain since the monsoon’s end.
More than an inch of precipitation could fall in the Valley later this week, although meteorologists aren’t yet certain when. But there is a fair chance the annual University of Arizona-Arizona State football game, held this year in Tempe, could be played on a muddy field.
Currently, there is a tropical weather system spinning several hundred miles off the Baja California coast. By the time it begins moving to the northeast, it will have plenty of moisture ready to drop.
That system is expected to collide with cold air from the Pacific Northwest, generating rainfall totals that could reach well in excess of 2 inches in the mountains east of the Valley. Because this is a warm storm, snow is projected only at elevations above 7,000 feet to 8,000 feet.
The National Weather Service’s computer forecasts are offering different arrival times. For now, meteorologists are saying the prime time for rain is late Friday night into Saturday night.
Until then, the Valley will be dry with periods of high clouds through Thursday.
Daytime high temperatures will run up to five degrees above normal, with nighttime temperatures further above average than that.