Some color before sunrise this morning, as middle and high clouds move northward across Tucson. Down at bottom is image of the Tetons bathed in moonlight (moon is now in a waning phase, but is still nearly full).
By the end of the week models forecast that a deep, 500 mb trough will re-established itself across the West (forecast above from 06 UTC GFS valid at noon next Saturday, the 7th).
Forecast plumes from the same run of the GEFS below indicate ( top to bottom) that: PW will plummet as the trough sets up; winds will be strong and gusty after Thursday; and that temperatures will become markedly cooler over the weekend. However, model forecasts little chance for rainfall at this time - will watch how this evolves next few days.
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