Christmas here in Tucson started out cool (low here at house 38F) and sunny. But by early afternoon the day had become very cloudy and dreary, as heavy, thick cirrus spread over southern Arizona from the Pacific - above image of campus and the Catalinas was at 2 pm.
The 500 mb pattern was much like the mid-range forecasts highlighted in earlier posts. Strong, negatively-tilted short-wave trough digging into north Texas (12 UTC analysis above) was main weather maker for the day. NWS watches and warnings for Christmas are shown below. Heavy snows from eastern Oklahoma into northern Arkansas occurred, with a severe thunderstorm outbreak over the lower Mississippi Valley (second graphic below).
This morning (Wednesday the 26th) the storm is impacting the Ohio Valley and heading for the east coast. The web cam image below shows early morning conditions in Indianapolis, Indiana, which was reporting heavy snow and 30 mph winds at the time of the image (about 7 am CST). Unsettled weather continues over the West and I'll take a look at the forecasts a bit later.
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