Below is the HRRR analysis for 1300 UTC (0600 MST) this morning showing the remarkable structure of the current cold surge interaction with the high topography near and along the Continental Divide. Analyzed surface temperatures are below -12ºF across much of central Wyoming and southwest Montana. The strong pressure gradient associated with this cold airmass is driving easterly and northeasterly flow into the Columbia Basin, Snake River Plain, and northern Utah. In the case of the latter, one can see how the Uinta Mountains splits the cold flow, with easterlies pushing across Evanston to the Wasatch Mountains and northeasterlies pushing across Dinosaur National Monument into the Uinta Basin.
|HRRR 1300 UTC 12 November 2014 surface temperature (ºF, color fill), wind vectors, and sea-level pressure (contours)|
|RRR 1300 UTC 12 November 2014 surface wind speed (miles per hour, color fill) and vectors|