Freezing fog across the Pacific Northwest
MODIS fog/stratus product + METAR surface reports
AWIPS images of the 1-km resolution MODIS fog/stratus product (above) showed areas of freezing fog that were persisting across parts of the Pacific Northwest region of the US during the pre-dawn hours on 10 December 2011. This freezing fog was causing a few traffic accidents on roadways across the region.
On the previous day (09 December), an NPP VIIRS true color image (below; courtesy of Liam Gumley, CIMSS) showed the daytime coverage of the fog and stratus features that were trapped beneath a strong temperature inversion with stagnant high pressure in place over the region.
NPP VIIRS true color image (courtesy of Liam Gumley, CIMSS)