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January 12-14 Potential Winter Weather Event


Hoosier

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After a warm start to the weekend, there are growing indications of a wave of low pressure developing along the cold front and providing snow/sleet/freezing rain. There are some slight differences as to where this will set up but the threat appears to be legit. An early look at the new 00z NAM reveals a wintry mess for the region.

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This storm is starting to look better and better for Chicago.

Being in the NAM jackpot at 84 hours ftl.

But in all seriousness, the general solution is not way out of line from previous runs of other models. NAM certainly looks beefy with qpf on the cold side though.

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That is typically the favored track for good snows here on the GFS.. Just not quite cold enough till near the end.

The GFS looks good for pretty much the region that has been screwed all winter. Lock it in! I am guessing the low cant go too far SE with the ridge..although the Canadian is taking the whole event waaaaay southeast.

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12z GFS says no accumulating snow for Chicago. A little bit of wintry mix and snow in southern Wisconsin. Probably will see a shift in the model solution as usual (especially at this range), but for now this strikes me as too warm to do any good, as you'd expect with a deep trough pumping air directly from the eastern Pacfic to the Midwest. 

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Several 0z GFS members further NW with more cold sector QPF but also several that are weaker like the Euro.

 

Yep, 8/12 have precip this far NW, with most of those being primarily snow; overall most of them are probably a mix of rain/ice/snow in the Chicago area, with a couple mostly or all snow, but more overall precip on average since they are further south.

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LOT

 

SATURDAY NIGHT AND SUNDAY...THINGS GET MORE COMPLICATED THIS PERIOD
AND OVERALL CONFIDENCE IN LIMITED IN THE SPECIFICS. THE SATURDAY
COLD FRONT WILL SLOW AND STALL OUT TO THE SOUTHEAST OF THE AREA
SATURDAY EVENING AS THE PARENT SURFACE LOW RACES INTO NORTHERN
QUEBEC. THE BIG WESTERN TROUGH WILL HAVE SHIFTED SLIGHTLY EAST BUT
THERE IS CONSENSUS ON ANOTHER WAVE ROUNDING ITS BASE AND LIFTING
NORTHEASTWARD ALONG THE NEWLY ESTABLISHED LOW/MID LEVEL BAROCLINIC
ZONE RESULTING FROM THE STALLING FRONT. SURFACE LOW PRESSURE LOOKS
TO DEVELOP ALONG THE STALLED FRONT IN RESPONSE TO THE UPPER WAVE.
THIS ALL PROVIDES FORCING FOR ASCENT ALONG ITS TRACK WHICH STILL HAS
ROOM FOR ADJUSTMENTS. PRECIP TYPE AND COVERAGE IS THE MAIN ISSUE
WITH THE PLACEMENT OF THE BAROCLINIC ZONE AND ULTIMATELY THE TRACK
OF THE SURFACE LOW DIRECTLY AFFECTING THESE ISSUES. LOW/MID LEVEL
COLD ADVECTION STRENGTHENS FROM THE NORTHWEST SATURDAY EVENING ON
NORTHWESTERLY FLOW WHILE MILDER AIR REMAINS ALOFT AHEAD OF IT.
GUIDANCE SEEMS TO BE COMING INTO BETTER AGREEMENT ON A TRACK
NORTHWEST OF WHAT IT INDICATED THE LAST 2 NIGHTS WHICH PUTS MUCH OF
THE CWA WITHIN THE EXPECTED PRECIP AREA. FREEZING RAIN/SLEET ARE
CONCERNS WITH SHALLOW COLD AIR IN PLACE OVER A PORTION OF THE AREA WITH
WARMER AIR STILL ALOFT. SNOW MAY ALSO OCCUR IN THE MIX. AFTER THAT
ITS A MATTER OF DETERMINING WHICH TYPE FALLS WHERE. BASED ON LATEST
THINKING THE FAR SOUTHEAST CWA LOOKS TO REMAIN MAINLY RAIN GIVEN
THAT THEY WILL COOL LEAST DURING THE DAY SATURDAY. JUST TO THE
NORTHWEST THERE LOOKS TO BE A NARROW CORRIDOR WITH SLEET AND
FREEZING RAIN POTENTIAL...WITH A CORRIDOR OF SLEET AND SNOW
POTENTIAL JUST NORTHWEST OF THAT...THEN PROBABLY A CORRIDOR OF ALL
SNOW. EACH OF THESE CORRIDORS MAY BE RATHER NARROW BUT THE MAIN AREA
OF CONCERN FOR MIXED PRECIP TYPES IS MAINLY FROM ALONG AND EAST OF A
LINE FROM CHICAGO SOUTHWESTWARD WITH THE FAR SOUTHEASTERN CWA
LOOKING TO TURN FROM RAIN TO SNOW TO SNOW AS COLDER AIR ARRIVES LATE.
AGAIN THIS IS DEFINITELY SUBJECT TO CHANGE. LIQUID EQUIVALENT
AMOUNTS LOOK TO BE AROUND A HALF INCH FOR MUCH OF THE AREA WITH NONE
TO A FEW TENTHS FAR NORTHWEST. DEFINITELY SOMETHING TO KEEP AN EYE
ON IF YOU TRAVELING ANYWHERE IN THE AREA SATURDAY NIGHT AND EARLY
SUNDAY MORNING. ANY PRECIP IS EXPECTED TO END BY MIDDAY SUNDAY OR SO
WITH HIGH PRESSURE ARRIVING FROM THE WEST.

 

 

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