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12/3-12/6 MW/GL snow event?


Thundersnow12

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my few fine flakes have turned into a more sold light snow now

but looks like it will move off to the ENE for both of us

some 5 inch amounts now reported in MN

I'm not sure how quickly this band is going to drift northeast. You can see another fine edge developing in Muscatine County now. This may just sit in place for long enough to give us 3" or so before lifting out.

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still like my 3-6" call for here, 18z NAM did come in a bit wetter fwiw.

Yeah I was debating between 2-4" or 3-5" but I decided on the latter given the somewhat prolonged nature of the event and at least a chance of decent ratios along with some potential heavier banding.

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What was my call this morning 2-5", 3-5" or something? I can't remember.

Either will work.

Yup one of those two. My 1-2" call looking fine although I still worry I don't even verify the 1"

Don't forget about putting your cam up so $, me and eastern MI can see what steady snow falling looks like.

File.png

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

348 PM CST FRI DEC 3 2010

DISCUSSION

348 PM CST

TONIGHT THROUGH SATURDAY NIGHT...

APOLOGIZE FOR THE LATE AFD...BEEN RUNNING BEHIND ALL DAY DUE TO BIG

DATA OUTAGE TODAY. GOING FORECAST FOR UPCOMING STORM IS PRETTY MUCH

RIGHT ON TRACK WITH JUST SOME MINOR TWEAKS TO TIMING OF HEADLINES TO

COINCIDE WITH EXPECTED TIMING OF SNOWFALL.

INTENSE VERTICAL CIRCULATION ASSOCIATED WITH NARROW MID-LEVEL

FRONTOGENETIC BAND HAS SATURATED COLUMN FROM TOP DOWN WITH A NARROW

BAND OF SOME RESPECTABLE SNOW MARCHING EAST INTO NW IL AT MID

AFTERNOON. THIS BAND WILL RESULT IN A BIT EARLIER ARRIVAL TIME FOR

SNOWFALL OVER OUR WESTERN CWA THIS EVENING AND HAVE ADJUSTED THE

START TIME OF THE ADVISORY UP A FEW HOURS THERE TO ACCOUNT FOR THIS.

RUC/WRF-NAM SUGGEST THIS BAND WILL SLOWLY TRANSLATE EASTWARD INTO

NORTH CENTRAL ILLINOIS WHILE SLOWLY WEAKENING THIS EVENING.

HOWEVER...AS THIS OCCURS EXPECT DEEP ISENTROPIC LIFT TO INCREASE AS

LOW/MID LEVEL FLOW BACKS IN ADVANCE OF THE SHORTWAVE RESULTING IN AN

EXPANDING AREA OF LIGHT TO MODERATE SNOW.

EVENT LOOKS TO BE ROUGHLY A 12 HOUR LONG PERIOD OF ACCUMULATING SNOW

WITH IT WINDING DOWN FROM NORTHWEST TO SOUTHEAST SATURDAY MORNING

INTO THE EARLY AFTERNOON HOURS ACROSS THE CWA. HAVE MAINTAINED

HIGHEST FORECAST SNOWFALL TOTALS OVER OUR WESTERN CWA WHERE THIS

INITIAL FRONTOGENETIC BAND WILL PROBABLY NUDGE TOTALS UPWARD AN INCH

OR TWO. GENERALLY EXPECT SNOWFALL TOTALS TO END UP IN THE 3-5 INCH

RANGE THOUGH CANT TOTALLY RULE OUT ISOLATED 6-7 INCH TOTALS OVER

WESTERN CWA.

PROBABLY THE BIGGEST WILD CARD LEADING INTO THIS EVENT IS THE LAKE

EFFECT POTENTIAL. HIGHER RESOLUTION MODELS HAVE FOR THE PAST COUPLE

OF DAYS BEEN DEVELOPING A MESOLOW OVER LAKE MICHIGAN AS GRADIENT

COLLAPSES TONIGHT AND LAND BREEZE DEVELOPS. THERMODYNAMICALLY...THIS

IS HARDLY THAT SPECTACULAR OF A SET UP FOR LAKE EFFECT WITH FAIRLY

MARGINAL INSTABILITY...HOWEVER GIVEN THE CONSISTENCY OF THE VARIOUS

MODELS SUPPOSE THERE IS A GOOD PROBABILITY OF A MESOLOW FEATURE

DEVELOPING OVER SOUTHERN LAKE MICHIGAN TONIGHT. UNFORTUNATELY THE

MOVEMENT OF THESE FEATURES IS ALL THAT PREDICTABLE AND SINCE THEY

TEND TO FOCUS CONVERGENCE AND LEAD TO INTENSE SNOW BANDS IT IS

WORRISOME THAT THE MODELS ALL DEVELOP ONE. PLAN OF ATTACK FOR NOW IS

TO MENTION LOCALLY HIGHER TOTALS NEAR THE LAKE...PARTICULARLY OVER

NW INDY SAT NIGHT WHERE DURATION OF LAKE EFFECT MAY BE LONGER.

DID GIVE SERIOUS CONSIDERATION TO UPGRADING LAKESIDE COUNTIES TO

WARNINGS...BUT MARGINAL THERMODYNAMIC ENVIRONMENT ALONG WITH THE

UNCERTAINTIES REGARDING POSSIBLE DEVELOPMENT OF MESOLOW AND ITS

EVENTUAL MOVEMENT IF IT DOES DEVELOP REALLY GAVE ME HESITATION ON

UPGRADING AT THIS TIME. QUITE POSSIBLE THAT LATER SHIFTS MAY NEED TO

BUMP UP SNOW TOTALS AND UPGRADE TO A WARNING FOR AREAS NEAR THE LAKE

ONCE LAKE EFFECT SHOWS THE WHITES OF ITS EYES.

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

348 PM CST FRI DEC 3 2010

DISCUSSION

348 PM CST

TONIGHT THROUGH SATURDAY NIGHT...

APOLOGIZE FOR THE LATE AFD...BEEN RUNNING BEHIND ALL DAY DUE TO BIG

DATA OUTAGE TODAY. GOING FORECAST FOR UPCOMING STORM IS PRETTY MUCH

RIGHT ON TRACK WITH JUST SOME MINOR TWEAKS TO TIMING OF HEADLINES TO

COINCIDE WITH EXPECTED TIMING OF SNOWFALL.

INTENSE VERTICAL CIRCULATION ASSOCIATED WITH NARROW MID-LEVEL

FRONTOGENETIC BAND HAS SATURATED COLUMN FROM TOP DOWN WITH A NARROW

BAND OF SOME RESPECTABLE SNOW MARCHING EAST INTO NW IL AT MID

AFTERNOON. THIS BAND WILL RESULT IN A BIT EARLIER ARRIVAL TIME FOR

SNOWFALL OVER OUR WESTERN CWA THIS EVENING AND HAVE ADJUSTED THE

START TIME OF THE ADVISORY UP A FEW HOURS THERE TO ACCOUNT FOR THIS.

RUC/WRF-NAM SUGGEST THIS BAND WILL SLOWLY TRANSLATE EASTWARD INTO

NORTH CENTRAL ILLINOIS WHILE SLOWLY WEAKENING THIS EVENING.

HOWEVER...AS THIS OCCURS EXPECT DEEP ISENTROPIC LIFT TO INCREASE AS

LOW/MID LEVEL FLOW BACKS IN ADVANCE OF THE SHORTWAVE RESULTING IN AN

EXPANDING AREA OF LIGHT TO MODERATE SNOW.

EVENT LOOKS TO BE ROUGHLY A 12 HOUR LONG PERIOD OF ACCUMULATING SNOW

WITH IT WINDING DOWN FROM NORTHWEST TO SOUTHEAST SATURDAY MORNING

INTO THE EARLY AFTERNOON HOURS ACROSS THE CWA. HAVE MAINTAINED

HIGHEST FORECAST SNOWFALL TOTALS OVER OUR WESTERN CWA WHERE THIS

INITIAL FRONTOGENETIC BAND WILL PROBABLY NUDGE TOTALS UPWARD AN INCH

OR TWO. GENERALLY EXPECT SNOWFALL TOTALS TO END UP IN THE 3-5 INCH

RANGE THOUGH CANT TOTALLY RULE OUT ISOLATED 6-7 INCH TOTALS OVER

WESTERN CWA.

PROBABLY THE BIGGEST WILD CARD LEADING INTO THIS EVENT IS THE LAKE

EFFECT POTENTIAL. HIGHER RESOLUTION MODELS HAVE FOR THE PAST COUPLE

OF DAYS BEEN DEVELOPING A MESOLOW OVER LAKE MICHIGAN AS GRADIENT

COLLAPSES TONIGHT AND LAND BREEZE DEVELOPS. THERMODYNAMICALLY...THIS

IS HARDLY THAT SPECTACULAR OF A SET UP FOR LAKE EFFECT WITH FAIRLY

MARGINAL INSTABILITY...HOWEVER GIVEN THE CONSISTENCY OF THE VARIOUS

MODELS SUPPOSE THERE IS A GOOD PROBABILITY OF A MESOLOW FEATURE

DEVELOPING OVER SOUTHERN LAKE MICHIGAN TONIGHT. UNFORTUNATELY THE

MOVEMENT OF THESE FEATURES IS ALL THAT PREDICTABLE AND SINCE THEY

TEND TO FOCUS CONVERGENCE AND LEAD TO INTENSE SNOW BANDS IT IS

WORRISOME THAT THE MODELS ALL DEVELOP ONE. PLAN OF ATTACK FOR NOW IS

TO MENTION LOCALLY HIGHER TOTALS NEAR THE LAKE...PARTICULARLY OVER

NW INDY SAT NIGHT WHERE DURATION OF LAKE EFFECT MAY BE LONGER.

DID GIVE SERIOUS CONSIDERATION TO UPGRADING LAKESIDE COUNTIES TO

WARNINGS...BUT MARGINAL THERMODYNAMIC ENVIRONMENT ALONG WITH THE

UNCERTAINTIES REGARDING POSSIBLE DEVELOPMENT OF MESOLOW AND ITS

EVENTUAL MOVEMENT IF IT DOES DEVELOP REALLY GAVE ME HESITATION ON

UPGRADING AT THIS TIME. QUITE POSSIBLE THAT LATER SHIFTS MAY NEED TO

BUMP UP SNOW TOTALS AND UPGRADE TO A WARNING FOR AREAS NEAR THE LAKE

ONCE LAKE EFFECT SHOWS THE WHITES OF ITS EYES.

Gino with a nice write up.

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Just got home from the QC. Had to get new tires put on and had made an appointment for 3. I figured the snow wouldn't start until about 5 or 6. Boy was I wrong lol. Started snowing like hell as soon as I got there. By the time I left around 4:30 they had to be pushing 2". Roads were pretty snow packed and very greasy.

Looks like I've picked up almost an inch and a half so far here. The snow seems surprisingly dry and fluffy. Don't know if that's just because the big dendritic flakes didn't pack down as much or what.

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Just got home from the QC. Had to get new tires put on and had made an appointment for 3.

So how did the new tires hold up in the snow? I love getting a new set of tires and being able to test them out right away!

Things seem to be on target with our system, if not an hour or two ahead of schedule. Looking at the 3-hour qpf accumulation on the 12h panel (06z UTC Saturday) of the 18z NAM, the current radar seems to be following suit, laying down some snow right where it's expected. Looking forward to waking up to some white tomorrow morning!

120310120410snow01.jpg

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So how did the new tires hold up in the snow? I love getting a new set of tires and being able to test them out right away!

They handled pretty well actually. Certainly a whole hell of a lot better than the old ones would have lol. They were getting pretty worn.

Snow picking back up a bit again here after a lull. Just took a measurement, sitting at 1.8".

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