Western Whatcom County
... Coldest night since November 2010 expected tonight...
... Freezing drizzle possible over the interior lowlands on Tuesday
An intensely cold air mass is in place over western Washington.
With clear skies... dry air... and light wind tonight... low
temperatures will be in the teens... with the coldest outlying
locations flirting with single digit temperatures late tonight.
A little light snow is possible on Sunday over the northwest
olympic peninsula... where up to one inch of snow is possible in
places like Forks... La Push and Neah Bay.
Weak onshore flow will kick in on Monday night... marking the
beginning of western Washington's transition away from the
modified Arctic air mass. As shallow Pacific moisture moves inland
on Monday night... there is a chance of light snow or freezing
drizzle on Tuesday morning for locations inland from the
coast... including the I-5 corridor from the Canadian border down
past Chehalis. By Tuesday afternoon... lowland temperatures should
rise comfortably above freezing... ending any concerns related to
light snow or freezing drizzle. It should be emphasized that any
precipitation would be light... amounting to just a few hundredths
of an inch... but it only takes a little ice accumulation to make
roadways and sidewalks slippery and hazardous.
Sources of forecast uncertainty regarding Tuesday morning include
where temperatures will remain below freezing... as well as
determining exactly where precipitation will and will not occur.
Check back tomorrow and Monday for the latest forecasts stemming
from our transition out of the cold air mass.
... Record low temperature set at Seattle WFO yesterday...
A record low temperature of 20 degrees was set at Seattle WFO on Dec
7th. This breaks the old record of 21 set in 2009.