Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 346 AM EST Sun Feb 27 2022 Valid 12Z Sun Feb 27 2022 - 12Z Wed Mar 02 2022 ...Northeast... Day 1... A strong arctic front sweeping through the Northeast today is expected to bring occasional snow squalls along and behind its boundary, most favored over central and northern NY and much of central to northern New England. Amounts will generally be light/minor with a couple of inches but the intensity and combination of strong winds will potentially make for hazardous to difficult driving conditions. The latest Key Messages have been updated and are listed below. WPC probabilities for at least 4 inches of snow are low and centered over the Tug Hill region into the northwestern Adirondacks with some upslope enhancement. Day 3... Clipper system will move through the Great Lakes into the Northeast Day 3 with light snow over northern New York eastward into New England. Quick pace will limit amounts despite a brief surge in moisture into Maine as the system zips off to the east. WPC probabilities for at least 4 inches of snow are low (10-30%) over northern NY into Maine. ...Pacific Northwest... Days 1-3... An impressive atmospheric river event setting up for the Pacific Northwest over the next 3 days will bring widespread precipitation to the region. An initial round of precipitation arrives during the day 1 period but the wettest day arrives on Monday associated with PW anomalies up to +3 sigma followed by a continued wet pattern for day 3 as the moisture plume sinks into Oregon. Three-day totals will exceed several inches with some isolated amounts over 8" possible in the highest peaks. This system is relatively warm so snow levels will be quite high (initially lower on day 1), particularly for day 2 with the heaviest precipitation so the greatest snow totals are expected for the highest peaks of the WA Cascades and the peak of the Olympics. Moisture will translate eastward into northern Idaho and northwest Montana with the higher peaks receiving more than 8-12 inches. WPC probabilities are high for 6 inches or more for the WA Cascades and even reach moderate to locally high for portions of the northern Rockies day 2. Fracasso Key Messages: - A strong cold front will sweep through the Northeast this afternoon and evening. - Snow squalls are expected to move from northwest to southeast along and behind the front across northern portions of New York and New England. - Intense but brief snowfall up to 1 inch per hour and wind gusts over 40 mph will be possible with these snow squalls. Visibility can quickly drop and create hazardous travel conditions when combined with new snow on the roads. - Any wet roadways will quickly freeze back over as temperatures drop into the teens and single digits Sunday night.