I'm sitting here sneezing, as the air is full of nasty stuff this morning. The cold front went through the Tucson metro area around 7 am this morning (Wednesday, March 7th). The air is dirty and carrying lots of dust and other chemicals and pollutants from distant locales. Above image is looking south from Kitt Peak and image below is from campus looking toward the Catalinas
The 500 mb analysis (above) this morning indicates the low to be closed off over the Great Basin with the coldest observed temperature being -30C at Las Vegas. Much cooler the next few days. The morning NAM forecast for 500 mb (60-hour forecast valid 5 pm MST on Friday is below) indicates that the tail of this closed low will still be hanging back over southeastern Arizona as the weekend begins.
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