Sunday, February 15, 2015

A Dreary Sunday Morning

Sunrise yesterday (Valentine's Day) painted the eastern sky an appropriate red. Photo above was from Santa Rita Abbey northwest of Sonoita, looking toward the east.

This morning, skies are dreary with a overcast of middle-level clouds (view of Catalinas below from about 7:30 MST) associated with the 500 mb closed low off of central Baja. That feature will pull eastward and weaken later today and tonight, while brutal winter weather continues over much of the central and eastern U.S.

Precipitable water (PW) has increased to around an inch over lower elevations of southern Arizona. The 13 UTC blended analysis from CIRA at Colorado State (above) indicates values well over an inch over the northern GoC and along the Borderlands. The sounding below (fromTWC at 12 UTC this morning) indicates little resistance to vertical motion above 700 mb. So sprinkles and light showers will be the weather word for today and tonight. Some spots may get measurable amounts, especially along the Borderlands, perhaps as far north as eastern Pima County. 

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