Temperatures continue to steadily fall during the daytime
tomorrow, with temps falling below zero along the coast during
the afternoon hours and wind chills in the -20s. Temps near -20
with wind chills around -40 expected across northern areas
during this timeframe.
Temperatures continue to fall tomorrow night as the cold
becomes downright dangerous. The center of the polar vortex is
expected to cross the area late tomorrow evening and shortly
after midnight, with temperatures dropping through after
midnight.
An unusual phenomena for our area is possible tomorrow night,
with guidance indicating that the tropopause could dip below the
peak of Mount Washington tomorrow night. While extremely rare,
the impact of this is that winds are likely to increase during
the overnight as the the wind becomes more compressed through
the lowest levels of the atmosphere. Combined with the bitterly
cold temperatures, wind chill values likely fall to as low as
-60 across northern areas, and -40 to -45 along the coastline.
Although unofficial, from the records we have been able to
gather, the coldest wind chill in Portland since 1948 was -43
degrees in 1971, so we are nearing wind chills values that most
have not seen in their lifetime.
this is a message from the NWS in Gray. The troposphere might dip below the summit of Mt Washington. The stratosphere is literally going to be kissing the ground! That’s how wild this arctic blast is for the ne
