Saturday, November 29, 2008

Forecast...

Side note this forecast was issued @ 5 am this morning...So the current conditions will be off!!
Also radar is showing snow increasing in coverage arcoss MN @ 7:51 am this morning....


Forecast problems short term none...Long term temps,and precip chances...

Current Conditions...
Temps are uniformed across the FA this morning....Mainly in the middle to upper teens...Skies in MN for the most part are mostly cloudy while in WI skies are clear to partly cloudy.IR satellite concurs....Winds rather light at this hour..Radar is showing an area of light snow up in the Itasca and Cass Counties..DBZ is null with this area,so thinking is it's not reaching the ground...Radar trends have this areas dissipating as it was moving East Northeast...Taking a fast look at the regional radars..We find not much out there at this hour...
SFC Analysis...
This morning's SFC map shows an area of week low pressure over Far Western MN...MBS around 1012...This low is forecasted to move Southeast into South Central MN around 18z today...By 00z Sunday the low should be just South of the Twin Cities area..By 06z Sunday said low is forecasted to drop into MO..At the same time we find another weaker short wave dropping out of Canada both of these features will drag a cold front through the area..
Today through Sunday night...
Clouds will be on the increase for those areas currently under partly to clear skies...Low pressure will slide off to our Southwest ...Moisture is null for this system,however some lift showing up in our Southern zones...These areas have the best chance at seeing some light snow...I'm not to trilled about accumulations...If I was to hedge a guess less than 1/2 inch...However will not add that into the forecast with dry air over head,as what little moisture around will go into getting the air saturated...Will keep snow going through Sunday do to the mass of system taking shape to our South/Southeast...This system could push some wrap around snow into the area,highly unlikely attm,however we do see some weak systems getting pushed South into our area before they wrap up with the upper level,and SFC low in the OH Valley area....
Sunday through Monday night...
Will have to keep snow alive over our far Northern areas of WI do to some light LES with winds flowing over the lake...I also have kept some snow going over far Northeastern MN as a weak system will be close to this area..Other than that have went with partly cloudy to mostly sunny skies across the remainder of the FA....
Tuesday through Wednesday night...
Main problems creep up big time in this time frame...
Computer models showing a 1000 MB low pressure over Northern Alberta Canada on Monday...This low is forecasted to move almost do East by 12z Tuesday,and deepen to around 992..By 12z Wednesday we find the low sitting just North of the FA in Southern Canada...This low pressure will drag a cold front into and through the area....Tuesday SFC temps would show mainly snow across the area,However at the 925 MB height we see a warm push of air 0c..This will aid in the production of a wintry mix across much of the FA..Sleet/freezing rain/snow....In our Central and Southern zones we may only find rain and snow...This could just be all rain by afternoon,before mixing and changing to all snow Tuesday night..Will keep the wintry mix going in the Northern areas of MN,and WI until the cold front pushes through these areas.Pressure gradients increases as this system pulls away from the area..So Wednesday late afternoon and maybe into Thursday winds could also become a problem....Should see all snow on Wednesday into Wednesday night...Depending on how fast this system moves through and how much moisture it can retain or tap..This could be our best shot at seeing some accumulations snows through out the FA...This will have to watched through the weekend....I won't even take a stab at how much snow might fall,as there are to many uncertainness with the models as of right now...One thing is common on the models is colder air will pour into the area for the remainder of the work week..
Longer term(Dec 7 through Dec 15)
Still looks like no big snow storms through this time frame as the main Southern jet remains to the South...Keeping all of the storms to our South and East...Thanks to the same old pesky Northwest flow that has been camping here since October..We will have a shot at some snow through out this time frame...As systems move down into the area from the Northwest...
So to sum it all up below norms in the temps and precip dept.