|Courtesy of Environment Canada|
Thursday, March 14, 2013
Windy and Colder...or Warmer
Colder air began pouring into the Fairbanks area Wednesday afternoon. The 4am Thursday surface analysis shows big high pressure extending from the Beaufort Sea southeast through the Yukon and western Northwest Territories, and broad low pressure in the Gulf of Alaska. Northeast winds gusted to 41 mph at the Fairbanks area during the late afternoon and early evening Wednesday.
The winds diminished mid-evening but never went calm overnight. This
prohibited any inversion from forming, as seen in the sounding plotted
on the left. The wind speeds above the ground, plotted on the right side
of the lower chart, are not excessive. Rather, with enough sunshine now
to completely break the valley based inversion, once the winds started
up Wednesday afternoon the winds were strong enough (enough momentum transport) to keep an
inversion from developing, even under completely clear skies.