Wednesday, April 10, 2013

***MAJOR WINTER STORM***
 
A major winter storm is on track to slam the forecast area....A band of heavy snow will fall from Southwestern MN up through Northwestern WI...Meanwhile a band of freezing rain will fall from Southeastern MN into parts of Southwestern WI....Just expecting mainly all rain in Southern WI....Yesterday we were concerned about about how much warm air would be around before the CAA kicked in...That no longer looks to be a problem for much of the FA....Still my Southern areas will see more of a mixed of precip....We were also concerned about the drier air that is flowing into the FA....This won't be a factor anymore, but will help boost the snowfall rates as it won't be as strong, and the system will over come the drier air much faster...The somewhat drier air will enhance the lift....We should see another round of thunderstorms with heavy snow, or what we like to call thundersnow.....The only adjustments need to the forecast was to delay the start of the precip....Start it later tonight....The other adjustment that was needed was to take out the sleet wording in my Central and Northern areas....
This major winter storm will have major impacts on travel starting later tonight and lasting through tomorrow....Don't think blowing and drifting snow will be that much of a problem, as it looks like a heavy wet snow, however if we can keep some more drier air around and cool off the middle and lower levels of the atmosphere then we could see near whiteout conditions and blizzard conditions from blowing and drifting snow, along with the heavy snow that is falling.....The way everything is shaping up this looks to be the biggest winter storm that we have seen this winter 2012/2013....For storm totals see map below....
This could be a very dangerous storm....If you must travel from tonight and tomorrow, let someone know your planned route time of departure and estimated time of arrival..Carry a winter safety survival kit in your vehicle, if you become stuck remain with your vehicle and call for help...Best thing one can do is delay your travel plans...
So how much snow are we forecasting...Here is the map....