Monday, December 18, 2017

Light Showers This Morning

Light showers around the metro area this morning (above composite radar from 7:15 am MST), with heaviest echoes over or near the airport. The ASOS at the airport seems to have had problems beginning early yesterday - system reports a total of only 0.02" early yesterday am and then nothing since. Was raining lightly here before sunrise.

Above and below show event rainfall totals from ALERT ending at 7:00 am this morning. Generally amounts at lower elevations ranged from a quarter to near half an inch. Heaviest amounts were in southern half of network where 3 sites had more than half an inch. Total amounts unknown at many higher elevation sites because of snow or rain/snow mix.

Our total here at house was 0.38" before the morning showers - that amount is 0.01" greater than the total here since August 13th, which highlights the extended dry period. Most of the rain here (0.35") fell as two morning bands of moderate to heavy showers passed by, ending before noon.

Nogales reported a total of 0.75" with some thunder yesterday. The lightning flash density plot at bottom (from and Vaisala for past 48-hours) indicates some isolated thunderstorms occurred near and east of Tucson.

Global models diverge after mid-week and it's not certain what we may get for weather on Christmas. But, the coming week will continue unsettled and cool, with two fronts probably coming by - one from northwest and then one from the east.

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