Forecast verification updated 7:00pm EST - 12 Jan 2011
The forecast for the heavy snowfall in the northeast match what happened. There is strong vorticity advection in the area which factoring into such strong winter weather patterns. The forecasted and actual 500mb heights, vorticity and vorticity advection maps matched up very well have shown to be accurate via the radar imagery and the snowfall amounts. In the midwest again forecast matched very well, but some lake effect or lake enhance was hard to predict and had erratic patterns not typical of lake effect snowfall. Once again the forecast for the Pacific northwest is holding true compared to what actually happened today. Extreme rainfall is happening due the vorticity forcing and seems to have become stationary with only more rain coming from warm moist air off the Pacific.
today's forecast verification graphic was produced by Talon Atwell and Brian Doogs
Radar Imagery at 2337 UTC on 12 Jan
24hr Precipitation totals as of 1200 UTC 12 JAN
500mb height, vorticity and vorticity advection as of 1200UTC 12 JAN