Tuesday, January 26, 2021

Significant Precipitation - Finally

View from campus a bit after 8:00 am MST shows snow cover over the foothills this morning. Both the airport and DM observed light snow after midnight. Not sure if there were any flakes mixed in here at house.

The 500 mb analysis (above) shows the main trough is still off to the west and that temperatures are very cold, -32 C here at Tucson. While most of the precipitation is now off to our south and east, the cold temperatures aloft could still support some showers before the trough is kicked off to east by next digging short wave. The GFS 500 mb forecast below is valid at 5:00 pm this afternoon and moves the trough rapidly across the state today.

Morning special graphic above from the NWS for rest of day, and also alerts for a very cold night tonight.

ALERT precipitation observations for 24-hours ending at 6:00 am this morning above and below. Second below shows ALERT totals over metro area for the event. Totals here at house went: 0.21" in gauge yesterday am; another 0.09" by 5:00 pm; and another 0.33" during the night; total for event as of 8:00 am this morning was 0.63" - making this the biggest precipitation event here at house since July 23rd.

There were thunderstorms yesterday - mostly west to north of metro area, as per plot of detected CGs (above, from Atmo and Vaisala) for 24-hours ending at midnight last night. Photo below shows severe hail that fell in Phoenix area with sizes slightly greater than inch. There were also numerous reports of damaging winds in the greater Phoenix area from the severe thunderstorms.

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