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The first winter storm of the season will arrive late this afternoon, according to forecasters from the National Weather Service office in Tucson.

“By this afternoon we’re going to see the wind pick up, get a little gusty,” says forecaster J.J. Brost. “Temperatures will start to cool off and then the rain is likely to hit. We even have a 100 percent chance of rain for later this evening and very high chances through Friday morning.”

Desert rainfall could total an inch, and up to a foot of snow could fall at elevations above 6,000 feet.

The weather service has issued a winter storm watch for tonight and Friday for elevations above 5,000 feet. Mountain roadways will be slick and snow-covered, and back country roads may become impassable.