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Summer rains could be boosted by evaporating snow
A National Weather Service graphic shows what a typical post-La Niña monsoon could look like.
By Bob Berwyn
SUMMIT COUNTY — You might want to get your outdoor yah-yahs out of the way early the next few days, as the National Weather Service is predicting an early onset of the monsoon season, with a good chance for afternoon thunderstorms through the rest of the week. Wednesday could be the wettest day, as a plume of subtropical moisture takes direct aim at the high country, but scattered daily rain can be expected right on through next weekend.
Specifically, the National Weather Service says there is a 40 to 50 percent chance of rain through Friday, with highs in the low 70s each day and overnight lows in the mid-40s, fairly close to seasonal averages. The record high for July 5 is 84 degrees, set in 2001. The record low, a chilly 24 degrees, set way back in 1931. Frisco’s all-time record high for July is 89 degrees, a reading that hasn’t been reached since 1939.
The U.S. southwestern monsoon season occurs when winter and spring’s jet stream-driven westerlies retreat to the north. Instead of being dominated by incoming cyclonic storms off the Pacific, the weather in the Southwest and the Rockies is influenced by the clockwise rotation of air around a big area of high pressure parked in the center of the country, often over Texas. The rotation draws moist air northward from the Gulf of Mexico, the Gulf of California and the eastern Pacific. (more…)
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