National Weather Service
National Oceanic and Atmospheric Administration
Wednesday, Feb 22, 2023
A cutoff low will continue to track south along the coast into the weekend pulling cold air west of the Cascades bringing dangerously cold
temperatures and varying snow accumulations across the area. Forecast confidence remains high (>95% chance) that temperatures will become cold tonight and last through Saturday morning. Wrap around moisture within the low will increase snow across much of the area, but confidence remains low when it comes to the exact snow amounts and location of the precipitation through Thursday morning.
The highest snowfall totals are expected across the Portland/Vancouver Metro & the I-5 Corridor in SW Washington. Temperatures are going to continue to fall this afternoon and evening and result in water and slush on surfaces freezing. Below freezing temperatures will take longer to reach areas from Salem southward, which will likely freeze after midnight.
KEY POINTS
– High confidence (>95% chance) we will experience colder temperatures across the region today through Saturday morning.
– Coldest temperatures expected Wednesday night – Saturday morning, but east winds will make it feel colder.
– Snow will diminish across the area overnight into Thursday
– Wind Chills tonight and Thursday night will cause temperatures feel very cold.
CHANGES FROM PREVIOUS BRIEFING
• Updated snowfall amounts/probabilities and temperatures
• Added Wind Chill
