Friday, December 27, 2019

Rainy/Snowy Morning Again

A dark and rainy morning here in Tucson. Amounts at low elevations range 0.20 to 0.40 inches currently, with rain still falling. View of Flagstaff at bottom is from about an hour ago - plenty of snow up there.

The NWS KEMX radar composite image above indicates echoes mainly around 25 to 30 dBZ. But this is a bit misleading since the radar elevation is over 5,00 ft MSL. The freezing level is very low (the 12 UTC TWC sounding below indicates the freezing level is right around 850 mb), so the echoes are mainly in the ice and the rain is below the elevation of the radar beam. Also, the snow level is quite low on the mountains.

The PHX radar second below is sampling both rain and ice because of its lower elevation (about 4,00 ft lower than Tucson radar).

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