Sunday, March 8, 2009

Major snowstorm update

I had to show the models and their thinking just to show the none forecasters or the ones who think then can walk the walk and talk the talk. But really can't.(Little forecasting skills)..How hard it is to come up with a forecast...

Update on the Major winter storm to effect the FA....

Major winter storm to effect the FA with rain,freezing rain,rain/snow mix,and thunderstorms,along with very windy conditions...
Lets break this all down by models.....

GEM/GLB....

12z Mon this model has as 1008 low pressure system over Northern KS/Southern NE..By 12z Tue low is forecasted to be in about the same area,however does deepen to around 1001 MBS....Low pressure than lifts Northeast towards Southern WI,and deepens to about 988 MBS.....Than lifts Northeast into Canada...Meanwhile a strong 1042 MB Arctic high pressure tries to build into the area.Pressure gradients increase,leading to very strong winds...This model did show a slight shift of the track towards the East...

UKMENT.....

12z Mon this model has a 1008 MB low over Western KS...By 12z Tue the low is forecasted to be in North central KS.This model deepens the low to around 997 MBS at this time frame...18z Tue low is forecasted to lift into Central WI..Also strong 1040 MB Arctic high pressure is forecasted to build into the Northern Plains..The pressure gradients will increase.Here again this would lead to very windy conditions...Also this track is a tad more East than previous runs....

ECMWF....

12z Mon 1003 MN low is found over Eastern CO..Low moves into Western KS by 12z Tue and deepens to about 997 MBS...By 18z Tue the low is forecasted to move into Central WI..Very windy conditions shall form as strong Arctic 1042-1043 high pressure build into the Northern Plains...Pressure gradients between said high and said low will tighten up....This track is has slightly shifted towards the South and East....

GFS ......

12z Mon.1004 MB low pressure over Eastern CO/Western KS This model move the low towards IA/MO by 12z Tue..By 00z Wed the low is forecasted to be centered in Western WI..Just South of Eau Claire...This low is forecasted to deepen to about 995 MBS by then...By 06Z Wed low is forecasted to be over Northeastern WI and down to 985 MBS....On this model we see a strong 1042-1043 MB Arctic high pressure trying to build into the..Pressure gradients will increase leading to very strong winds across the area...This track is about the same with a very slight shift to the South and East...

NAM....

I won't even talk about this model,as there is nothing there I can use for this forecast..As this model remains the outlier still..

You ask ok what does this all mean..As you can see from above models there is still some issues in the track and how strong the low will be....Here is where a forecaster's skills kick in as you are about to see....
I will lean more on ECMWF and some of GFS details,blended with GEM and UKMENT models...
Low pressure over Eastern CO is forecasted to move into Eastern KS than take a turn Northeast and move through Eastern Parts of IA then into Southwestern WI between La Cross and Madison...Low is than forecasted to move into Northeastern WI to around the Crandon area...This track would as a rule give all the FA a shot at heavy snow,however warmer air is forecasted to get mixed into the system..So thinking is the heavy snow band will set up in Central to Northern MN where over a foot will be possible...Strong winds will lead to blizzard conditions across this area..Over in Northern WI will see mixed precip change over to all snow here we could see around 6 inches of snow..Points from Central Burnett,Sawyer,and Washburn Counties North wards...Points South of that as right now should see less than 4 inches of snow,as the rain/mixed will hold on longer in these areas..These areas could also see a few thunderstorms as Lapse rates increase and LIS drop to 0 to around 1....After this winter storm moves out Arctic high pressure builds in...Temps go no where but down..Below zero for lows through Friday morning.With highs ranging from the single digits to around 20......