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December 20th-22nd Major Winter Storm Part II


andyhb

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So lake temps only really factor in with some sort of easterly wind... makes sense.

Here's hoping the models are wrong and BowMe gets a foot :)

Once lake temperatures get below 40° overall, mixing is a lot less likely especially if you don't have a marginal situation where you have SE or E winds. Mid 30s pretty much no affect at all up this way at least.

BowMe will get 6"! :mapsnow:

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update from LSE

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE LA CROSSE WI

1046 AM CST WED DEC 19 2012

.SHORT TERM...

1046 AM CST WED DEC 19 2012

WITH THE LATEST 19.12Z NAM/GFS SOLUTIONS COMING IN WITH MORE STORM

TOTAL PRECIPITATION AND FURTHER NORTHWEST...WILL UPDATE THE

ADVISORY AREA TO WARNING BY NOON TODAY. WILL ALSO INCREASE SNOW

AMOUNTS AREA WIDE...AND EXTEND THE WARNINGS TO MIDNIGHT THURSDAY AS

THE WINDS WILL CONTINUE THE IMPACTS INTO THURSDAY EVENING.

THIS STORM WILL CAUSE MAJOR IMPACTS ACROSS EXTREME NORTHEAST IOWA

AND SOUTHWEST INTO CENTRAL WI. IN THE BLIZZARD WARNING...THIS IS A

LIFE-THREATENING STORM FOR THOSE THAT ARE OUTDOORS. DRIFTS OF 2-4

FEET...CLOSED ROADS/DRIVEWAYS...WHITEOUT CONDITIONS ALL ARE

LIKELY. EMERGENCY SERVICES WILL LIKELY NEED TO STOP FOR A PERIOD

LATE TONIGHT THROUGH THURSDAY AT THE HEIGHT OF THE STORM IN THE

BLIZZARD WARNING AREA. TRAVEL MUST BE HIGHLY DISCOURAGED AS ROAD

CREWS WILL NOT BE ABLE TO KEEP UP WITH THE SNOW RATE AND WIND

RECOVERING OF THE ROAD WITH SNOW. IMPACTS WILL NOT BE AS GREAT

FURTHER NORTHWEST OUT OF THE BLIZZARD WARNING BUT IT WILL STILL BE

SIGNIFICANT. ANY HELP LOCAL MEDIA CAN PROVIDE TO THIS EFFECT WILL

BE HELPFUL.

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First MCD for our storm.

mcd2176.gif

MESOSCALE DISCUSSION 2176

NWS STORM PREDICTION CENTER NORMAN OK

1047 AM CST WED DEC 19 2012

AREAS AFFECTED...NERN/E-CNTRL CO...NWRN/W-CNTRL/N-CNTRL

KS...SWRN/S-CNTRL/CNTRL NEB

CONCERNING...BLIZZARD

VALID 191647Z - 192245Z

SUMMARY...BLIZZARD CONDITIONS WILL DEVELOP AFTER 19Z ACROSS PARTS OF

CO/NEB/KS...AND SPREAD EWD/ENEWD INTO THE EVENING.

DISCUSSION...DURING THE NEXT FEW HOURS...STRONG SFC CYCLOGENESIS

WILL OCCUR OVER SWRN KS AND THE OK PANHANDLE AS STRONG DCVA LEADING

AN APPROACHING PV MAX OVERTAKES A BROAD AREA OF LOW-LEVEL

BAROCLINICITY. THE DEVELOPING SFC LOW WILL TRACK EWD NEAR OR JUST

NORTH OF THE KS/OK BORDER THROUGH THIS EVENING...WHILE A VERY TIGHT

SFC PRESSURE GRADIENT W/NW OF THE CENTER OF THE LOW SUPPORTS

NNWLY/NLY WINDS OF 25 TO 40 MPH WITH GUSTS OF 45 TO 60 MPH. THESE

WINDS WILL SPREAD EWD/ENEWD ACROSS THE DISCUSSION AREA AFTER 19Z.

THE STRONGEST WINDS ARE FORECAST TO EXTEND FROM E-CNTRL/NERN CO EWD

ACROSS NWRN/W-CNTRL/N-CNTRL KS AND SWRN/S-CNTRL NEB. SUPPORT FOR

THESE WINDS WILL EMANATE FROM 40-50 KT OF 0-1-KM MEAN FLOW PER

FORECAST SOUNDINGS AMIDST STEEP SFC-1-KM-AGL LAPSE RATES DRIVEN BY

INCREASING COLD ADVECTION WITH HEIGHT JUST ABOVE THE SFC.

STRONG 850-500-MB FRONTOGENESIS OCCURRING WITHIN THE DEFORMATION

ZONE OF THE CYCLONE WILL SUPPORT ASCENT OVERLAPPING WITH THE

DENDRITIC GROWTH ZONE TO YIELD AN EWD/ENEWD-DEVELOPING BAND OF HEAVY

SNOW WITH RATES OF 1-1.5 IN/HR. THE LATEST SHORT-RANGE GUIDANCE

SUGGESTS THAT THIS BAND WILL DEVELOP EWD/ENEWD FROM PARTS OF NERN CO

INTO NWRN/N-CNTRL KS AND ACROSS SWRN/S-CNTRL NEB. WEAK ELEVATED

BUOYANCY MAY SUPPORT AN ISOLATED LIGHTNING STRIKE OR TWO WITHIN THE

HEAVIEST SNOW BURSTS.

THE AFOREMENTIONED FACTORS WILL SUPPORT BLIZZARD CONDITIONS

ASSOCIATED WITH VISIBILITIES BELOW ONE-QUARTER MILE AND BLOWING SNOW

ACROSS THE DISCUSSION AREA. THE AREA OF GREATEST CONCERN FOR

BLIZZARD CONDITIONS LIES WITHIN THE OVERLAPPING AREAS OF HIGHEST

CONFIDENCE FOR 1-1.5-IN/HR SNOW RATES AND STRONGEST WINDS -- I.E.

FROM NERN CO ENEWD INTO S-CNTRL NEB.

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you have to imagine the watches are 99% related to a potential brief period of +SN and high winds and not accumulations.

Their AFD states that to be true

HAVE EXPANDED THE WINTER STORM WATCH TO INCLUDE NORTH OF THE I-80

CORRIDOR...INCLUDING CHICAGOLAND AND FAR NORTHWEST INDIANA. THIS

WATCH IS MUCH MORE TOWARD IMPACT-BASED BETWEEN THE COMBINATION OF

SNOWFALL RATES AND WIND DURING THURSDAY EVENING AS OPPOSED TO

ACTUALLY SNOWFALL AMOUNTS. THE FORECAST ESSENTIALLY HAS REMAINED

THE SAME.

With more erotic writing that follows:

COBB DATA FROM BOTH THE

NAM AND GFS INDICATE A FEW HOUR WINDOW OF EXPLOSIVE SNOWFALL RATES

/2 PLUS INCHES PER HOUR/ MOVING GRADUALLY FROM WEST TO EAST OVER

NORTHERN IL FROM 3-10 PM...MOVING ACROSS CHICAGO DURING THE LATTER

PART OF THAT TIME. THIS COALESCES WITH THE STRONGEST WIND

PERIOD...WHICH STILL ON THE 12Z GUIDANCE FAVORS 50+ MPH GUSTS FOR A

SEVERAL HOUR window. BECAUSE OF THESE HIGHER END SNOWFALL RATES

AND WINDS...HAVE EXPANDED THE WATCH EAST AND SOUTH. AT LEAST A

HIGHER END ADVISORY LOOKS LIKELY...BUT THE POTENTIAL FOR MORE

SIGNIFICANT IMPACTS IS THERE...INCLUDING TEMPORARY BLIZZARD

CONDITIONS IN THE WESTERN PORTION OF THE WATCH AND WITHIN THE

CURRENT WARNING.

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DTX still thinking 1-2" wraparound for SE MI. Euro, NAM, GEM would agree...GFS not so much.

I think we live in a snow hole...... I will be glad just to get out there and play in the snow all the less. As for ground temps and freeze ups I think DTX area will be safe until Friday evening at dusk.

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