A touch of snow this morning on the ground in Summerhaven.
The snow fell ahead of the sharp trough that moved across Arizona during the past 24-hours. Analysis above is for 12 UTC 250 mb level, showing the very strong jet stream with the trough. Temperatures this morning were the coldest so far this Fall - low temperatures shown across metro area below. Here at house we had our first freeze with the low dropping to 32F.
Two portions of the ALERT network had mostly light precipitation as the trough moved through - one site on the Catalinas had just over half an inch. Here at the house I didn't note any rainfall, but there may have been a light sprinkle which I missed.
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