In a hurry this morning to get a few things done before heading to work…I can tell it’ll be a long day. Three things pop out:
1. Snow sometime after 7pm this evening to all areas above 1,000′, probably lower than that far east side of metro area.
Situation this evening is very similar to what occurred November 17th: https://fox12weather.wordpress.com/2010/11/17/a-crazy-weather-night/ This should be fun to watch.
Steady, heavy precipitation as a wave passes by and colder air comes surging in at the surface from the northwest. In fact no southerly wind but a light north-northwest wind. Our RPM model shows a changeover to mostly snow in the air even at the lowest elevations, and sticking for sure on the hills. In this pattern the foothills of the Cascades (and east Valley) are/is favored. It may even stick in Gresham, Troudale, Camas, Estacada. Less likely over in the Tualatin Valley as things dry out. Prime time seems to be 7pm-Midnight. I can already feel the news freakout…praying that it holds off until 9pm or so.
2. Precipitation is very close Thursday morning, closer than in previous model runs…could be a dusting?
3. GFS is swinging dry over the weekend like ECMWF now, we can leave the precipitation out of the forecast.
Chief Meteorologist Mark Nelsen