Dramatic Low Level Cooling

The boundary layer cooled dramatically Thursday, probably in response to weak vertical motion from a Gulf of Alaska storm that has spread high clouds across the area.

While valley temperatures have been very slowly rising all day, temperatures having been falling at elevation. Here on Keystone Ridge it's been down by 12 below, while at the RAWS Caribou Peak was at +6F as late as 7am, while by 4pm it was down to -6F.