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JAN. 6-9 LES Set up


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I'm going to remain cautiously optimistic with this one also...I never recalled seeing more than 2" from LE, but it should be interesting to see what may occur. At least these bands can make for a quick dusting in a matter of minutes.

If you get under 2 inches I'll bring the snow from my lawn over :)

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When I was living in Ann Arbor 4 years ago, DTX issued a very rare Lake Effect Snow Advisory for Washtenaw and Livingston Counties. They were honking the event for days and it looked great on the models right up until the event. What happened? A trace to half inch at best.

It's extremely difficult to forecast LES for SE Mich that's Lake Michigan induced. So many wrenches into the equation that pinpointing an exact spot is impossible. I don't know how many times I've heard the blanket, "between I-94 and I-69 corridor" phrase from DTX, but really, that's the best you can do.

Do you happen to remember if there was ANY synoptic impact? With all those little Ls, shortwaves, whatever rotating around, they should give a little boost to the LES.

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST

MICHIGAN.

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

AN EXTENDED PERIOD OF COLD AND MOIST CONDITIONS WILL ALLOW SNOW

SHOWERS TO DEVELOP ACROSS SOUTHEAST LOWER MICHIGAN OVER THE NEXT

SEVERAL DAYS. THE POTENTIAL EXISTS FOR SEVERAL INCHES OF

ACCUMULATION TO OCCUR BETWEEN THURSDAY EVENING AND SATURDAY. A

PERIOD OF MORE INTENSE SNOWFALL WILL BE POSSIBLE DURING THIS TIME

AS ORGANIZED LAKE EFFECT BANDS MOVE OFF LAKE MICHIGAN.

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Hmmm..?? 06-07? Sounds like the event i mentioned earlier that gave me my first LES warning here. I know it made it to Jackson but unsure/forget what happened further east?

Yeah. It was 06/07, if memory serves me correctly it was during the weekend sometime in late January or February.

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Yeah. It was 06/07, if memory serves me correctly it was during the weekend sometime in late January or February.

That would be it. That was one heck of a sweet band. They had to close i94 from Marshall on west with that. Complete whiteout and accidents galore.

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Very nice surprise to wake up to, nearly an inch of fluffy snow! Didnt expect that much overnight, all is white again (except grass tips). Through 8am had 0.9" snow with 0.05" water content. DTW had 0.7" thru 7am. Will be interesting to see how the next few days pan out, looks like several waves of snow showers. Despite this mornings surprise, dont wanna get too excited yet, though DTX forecast disc was very nice and very detailed!

SHORT TERM...TODAY AND TONIGHT

NUMEROUS SHORT WAVES CONTINUE TO TRAVERSE THE REGION WITHIN THE

NORTHWESTERLY FLOW NOW IN PLACE ACROSS THE GREAT LAKES. ADEQUATE

MOISTURE ADVECTION LAST NIGHT ALONG WITH LARGE SCALE ASCENT FROM MID

LEVEL FEATURES AND PERIODIC LOW LEVEL CONVERGENCE FEATURES WILL

SUPPORT OCCASIONAL SNOW SHOWERS THROUGH MOST OF THE SHORT TERM.

THE CURRENT REGIONAL RADAR LOOPS SHOW LIGHT SNOW MOVING ACROSS

LOCATIONS MAINLY SOUTH OF THE I 69 CORRIDOR. THIS SNOW HAS DEVELOPED

WITHIN A REGION OF MOIST ISENTROPIC ASCENT AHEAD OF A WEAK MID LEVEL

TROUGH NOW EXTENDING FROM SW LOWER MI THROUGH INDIANA. THIS FEATURE

AND ITS ASSOCIATED LARGE SCALE DYNAMICS HAVE TRACKED A LITTLE

FARTHER SOUTH THAN EXPECTED IN EARLIER FORECASTS. THUS IT APPEARS

THAT SOME MINOR ACCUMULATIONS EARLY THIS MORNING /AROUND AN INCH OR

LESS/ WILL BE FOCUSED MAINLY ACROSS THE DETROIT/ANN ARBOR METRO

AREAS AND POINTS SOUTH.

SUBSIDENCE BEHIND THE AFORMENTIONED SHORT WAVE WILL NOT BE TOO

TERRIBLY STRONG BUT SHOULD LOWER MOISTURE DEPTHS A BIT LATER THIS

MORNING BASED ON MODEL SOUNDINGS. THE SURFACE LOW NOW LOCATED OVER

EASTERN LAKE SUPERIOR IS FORECAST TO TRACK SE INTO GEORGIAN BAY

TODAY...WHICH WILL DRAG AN ASSOCIATED COLD FRONT ACROSS SE MI

GENERALLY IN THE 15Z TO 18Z TIME FRAME. BOUNDARY LAYER CONVERGENCE

ALONG THIS FEATURE WILL PROVIDE CONTINUED SUPPORT FOR ADDITIONAL

SNOW SHOWERS. SNOWFLAKE SIZE MAY BE COMPROMISED A BIT BY THE MORE

SHALLOW MOISTURE. A SECONDARY SHORT WAVE NOW OVER MINNESOTA IS

FORECAST TO QUICKLY PUSH INTO INDIANA AND OHIO THIS AFTERNOON. THIS

FEATURE WILL BOOST MOISTURE DEPTH AND PROVIDE SOME WEAK LARGE SCALE

ASCENT...WHICH ALONG WITH COLD AIR ADVECTION AND INCREASING LAKE

EFFECT CONTRIBUTIONS SHOULD LEAD TO MORE INTENSE SNOW SHOWER

ACTIVITY LATER THIS AFTERNOON. OVERALL...PLAN TO KEEP SNOW

ACCUMULATIONS FROM 12Z THROUGH 00Z AN INCH OR LESS. THERE IS

INDICATIONS FROM BOTH THE NAM AND 4KM WRF IN AN ENHANCED REGION OF

LOW LEVEL CONVERGENCE DEVELOPING ALONG THE I 94 CORRIDOR THIS

AFTERNOON. IF THIS DOES DEVELOP...SNOWFALL ACCUMULATIONS MAY HAVE TO

BE INCREASED ALONG A LINE FROM ANN ARBOR TO DETROIT.

THE ELONGATED UPPER LOW NOW OVER NW ONTARIO WILL BE DRIVEN ACROSS

LOWER MI TONIGHT IN RESPONSE TO THE RETROGRESSION OF THE EASTERN

CANADIAN UPPER LOW NOW OVER SOUTHERN QUEBEC. THE LOW LEVEL FLOW IS

FORECAST TO BACK MORE NORTHWESTERLY. SO THE MORE INTENSE LAKE

ENHANCED ACTIVITY SHOULD BE FOCUSED TO THE WEST OF THE DTX FORECAST

AREA. THE LARGE SCALE DYNAMICS AND STEEPENING SFC TO 700MB LAPSE

RATES WILL HOWEVER CONTINUE TO SUPPORT WIDESPREAD SNOW SHOWERS

TONIGHT. AT THIS STAGE IN THE FORECAST...WILL KEEP ACCUMULATIONS AN

INCH OR LESS. IF HOWEVER SOME PROLONGED LOW LEVEL CONVERGENCE CAN BE

SET UP...ACCUMULATIONS IN SOME LOCALS MAY BE HIGHER.

LONG TERM...FRIDAY THROUGH WEDNESDAY

FIRST HALF OF THE EXTENDED FORECAST CENTERS AROUND LAKE EFFECT AND

LAKE ENHANCED SNOW POTENTIAL THROUGH SATURDAY NIGHT...AND POTENTIAL

FOR ACCUMULATIONS.

UPPER VORTEX WILL SLOWLY SINK SOUTH INTO MICHIGAN ON FRIDAY AND THEN

INTO NEW ENGLAND ON SATURDAY. FIRST BIG VORTICITY MAX WILL PIVOT OUT

OF MICHIGAN EARLY FRIDAY MORNING. THERE THEN REMAINS STRONG MODEL

CONSENSUS WITH BRINGING THE SECOND BIG VORT MAX ACROSS WESTERN

MICHIGAN ON SATURDAY. (THE 00Z NAM WAS A SLOWER OUTLIER.) THIS WILL

LIKELY HELP RETROGRADE AN AREA OF LOW PRESSURE FROM GEORGIAN BAY

BACK INTO LAKE HURON FRIDAY NIGHT. THIS SURFACE LOW IS THEN EXPECTED

TO TRACK SOUTHEAST INTO NEW ENGLAND ON SATURDAY ALONG WITH THE

VORTEX. TEMPERATURES THROUGH THIS PERIOD WILL BE BELOW NORMAL WITH

HIGHS JUST BARELY ABOVE 20 ON FRIDAY AND ONLY WARMING INTO THE MID

20S OVER THE WEEKEND. CLOUDS...SNOW...AND SOME WIND WILL PREVENT

LARGE DIURNAL SWINGS IN TEMPERATURE AND KEEP OVERNIGHT LOWS FROM

BECOMING TOO FRIGID HOWEVER. LOWS FRIDAY NIGHT THROUGH SATURDAY

NIGHT SHOULD BOTTOM OUT IN THE TEENS.

A DEEP COLUMN OF COLD AIR SHIFTING INTO THE REGION WITH BOTH SURFACE

AND UPPER LEVEL LOW PRESSURE WILL CREATE STRONG INSTABILITY OVER THE

AREA FRIDAY THROUGH SATURDAY NIGHT...WITH FAIRLY STEEP LOW AND MID

LEVEL LAPSE RATES. THIS COLD AIR STREAMING OVER THE RELATIVELY WARM

LAKE WATERS WILL CREATE STRONG INSTABILITY...RESULTING IN HEALTHY

LAKE EFFECT SNOW DEVELOPMENT. FORECAST CHALLENGE THEN TURNS TO

TRAJECTORY AND HOW FAR INLAND ACCUMULATING SNOW WILL PENETRATE.

WHILE THERE IS POTENTIAL FOR AT LEAST LIGHT ACCUMULATIONS OF SNOW

ACROSS THE ENTIRE AREA FRIDAY AND FRIDAY EVENING...FOCUS FOR

ACCUMULATIONS WILL CENTER AROUND NORTHWEST FLOW FROM OFF LAKE

MICHIGAN. WILL ALSO SEE SOME ENHANCEMENT TO SHOWER ACTIVITY AS THE

UPPER SHORTWAVE WORKS ACROSS THE AREA. BEST CONVERGENCE...AND

THEREFORE BEST ACCUMULATION POTENTIAL...LOOKS TO BE SOUTH OF

M-59...POSSIBLY MORE TOWARDS THE I-94 CORRIDOR. SNOW AMOUNTS ARE A

LITTLE UNCERTAIN GIVEN DISTANCE FROM THE LAKE...BUT THINK WE COULD

SEE 1 TO 3 INCHES SOUTH OF M-59 BETWEEN FRIDAY MORNING AND LATE

FRIDAY NIGHT. MODELS ARE NOW SHOWING A SECOND AREA OF GOOD

CONVERGENCE STRETCHING FROM NORTH OF TRAVERSE CITY SOUTHEAST ACROSS

SAGINAW BAY AND THE THUMB ON FRIDAY. THIS AREA WOULD BE AIDED BY

LIFT AND FLOW AROUND THE SURFACE LOW AS IT PUSHES BACK INTO LAKE

HURON...AND WOULD INCLUDE A FETCH ACROSS BOTH LAKE SUPERIOR AND LAKE

MICHIGAN. WHILE IT DOES HAVE A SLIGHTLY DIFFERENT SYNOPTIC

SET-UP...DID SEE BANDS DO THIS EARLIER IN THE WINTER. WILL WATCH

THIS POTENTIAL OVER THE NEXT FEW MODEL RUNS...BUT AMOUNTS SHOULD BE

LIGHTER THAN THOSE SOUTH OF M-59 AS LOW-LEVEL FLOW ACROSS NORTHERN

LAKE MICHIGAN FRIDAY EVENING BECOMES LIGHTER AND TURNS MORE TO THE

NORTH/NORTHWEST IN RESPONSE TO THE SURFACE LOW SINKING SOUTH.

FOCUS WILL THEN SHIFT TO FLOW OFF LAKE HURON LATE ON FRIDAY NIGHT AS

WINDS TURN MORE TO THE NORTH AND NORTHEAST. THIS COULD POTENTIALLY

BRING SOME MODERATE ACCUMULATIONS OF SNOW TO THE THUMB FRIDAY NIGHT

AND SATURDAY...AND MAY NEED TO CONSIDER SOME TYPE OF WINTER WEATHER

HEADLINE. SURFACE LOW OVER THE LAKE WILL TRACK SOUTHEAST INTO

ONTARIO LATE FRIDAY NIGHT. LAKE EFFECT BANDS ACROSS THE NORTHERN AND

CENTRAL PORTIONS OF THE LAKE SHOULD BE TEMPORARILY INTERRUPTED BY

THE LIGHT AND VARIABLE WIND FIELD UNDER THE CENTER OF THE LOW.

MODELS HOWEVER NEVER DROP THIS FEATURE FAR ENOUGH ACROSS SOUTHERN

LAKE HURON TO CUT OFF THE LAKE EFFECT BANDS. GFS NOT ONLY SHOWS

NORTHERLY FLOW BRINGING LAKE=EFFECT INLAND LATE FRIDAY NIGHT...BUT

GENERATES A LOT OF LIFT OVER THE THUMB AS THE LOW BRUSHES

BY...BRINGING POTENTIALLY HEAVY LAKE-ENHANCED SNOW. MODELS THEN ALL

INCREASE THE NORTH-NORTHEAST SURFACE-850MB WINDS LATE FRIDAY NIGHT

AND CONTINUE THEM INTO SATURDAY. LAKE EFFECT LOOKS VERY FAVORABLE

ACROSS SOUTHERN LAKE HURON FRI NIGHT THROUGH SATURDAY WITH FORECAST

SOUNDINGS FROM THE NAM AND GFS INDICATING STEEP LAPSE RATES AND A

SATURATED AIRMASS UP THROUGH AT LEAST 12000 FT (00Z GFS UP TO 18000

FT!). THESE PARAMETERS DO START TO BECOME LESS FAVORABLE BY LATE

SATURDAY AFTERNOON AS THE COLD CORE PUSHES WELL TO OUR EAST AND AS

WIND FIELD BEGINS TO TURN MORE NORTHWEST. CURRENT FORECAST WAS A

LITTLE CONSERVATIVE WITH THE SNOW AMOUNTS OFF LAKE HURON CONSIDERING

WE ARE STILL 48-60 HOURS OUT...AND GIVEN CONTINUED INCONSISTENCIES

WITH HOW THE MODELS HANDLE THE TRACK OF THE SURFACE LOW. THIS EVENT

MAY EVENTUALLY REQUIRE A WATCH/ADVISORY/WARNING FOR AT LEAST

HURON...SANILAC...AND PORTIONS OF ST CLAIR COUNTIES...WITH CURRENT

FORECAST HAVING ABOUT 6 INCHES ALONG THE EASTERN SHORELINE OF THE

THUMB (FROM LATE FRIDAY NIGHT THROUGH SATURDAY EVENING). AM PACKAGE

ALSO HAS AT LEAST AN INCH OF SNOW AFFECTING THE FORECAST AREA EAST

OF A LINE FROM SAGINAW BAY TO DETROIT ...WITH HEAVIER TOTALS AS YOU

MOVE TOWARDS THE THUMB.

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Thread title change accomplished. Snow is starting here at Elkhart. Can still see grass in spots but is now predominantly white once again. Extra surge of cold air should really get the LES going by Friday according to IWX.

I am a bit surprised at how quick it developed in the past hour. Has me wondering a bit about the rest of today? Has slackened off slightly the past few minutes but still flying at a decent clip. Seems that most agree that tomorrow looks to be primetime for this event especially up this way. Tomorrow night depends on how quick the flow bends to the nnw and or more northerly which is when things should drop off here once it does bend nnw. Assuming it does that is.

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DTX has bumped up totals for today/this evening there as well.

.UPDATE...

SOME LOW-LEVEL CONVERGENCE ALONG THE COLD FRONTAL BOUNDARY HAS

LED TO SOME INCREASED UPWARD MOTION...ALLOWING A BRIEF INCREASE IN

SNOWFLAKE SIZE AND SNOWFALL RATES. ENOUGH COLD AIR IS PRESENT AND

THE COLUMN IS QUITE SATURATED THROUGH THE DENDRITIC GROWTH ZONE.

THIS HAS LED TO INCREASED SNOWFALL AND AN END TO THE THREAT FOR

FZDZ. VISBYS HAVE DROPPED TO NEAR 1 MILE IN MANY AREAS WITH THE

SNOW. ALSO LOOKING AND AN ELONGATED SHORTWAVE APPROACHING

TONIGHT...SO HAVE SLIGHTLY INCREASED SNOW TOTALS FOR TODAY AND

TONIGHT. NOT THINKING ADVISORY SNOW RATES FOR TODAY...BUT SOME

AREAS OF SE MI COULD SEE OVER 2 INCHES OF SNOW IN THE NEXT 12

HOURS. HAVE INCREASED POPS AND SNOW AMOUNTS IN THE GRIDS.

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yea but i was referring to LES for Harry. I think he was ready to throw in the towel on synoptic and LES because he was thinking the DEC pattern was going to repeat.

It seems ma nature is out to teach me a lesson. :P Very rare to see this type of LES event here as anyone from around here will tell you. So yeah i guess ma nature is out to prove me wrong. :lol: Has a little ways to go though to get me on the +side of normal. :scooter:

SHORT TERM...(345 PM EST THU JAN 6 2011)

(TONIGHT THROUGH SATURDAY NIGHT)

ONE SHORTWAVE IS CURRENTLY EXITING THE AREA TO THE EAST... BUT THE

NEXT WAVE IS FAST APPROACHING FROM THE NORTHWEST. THIS NEXT WAVE IS

STRONGER/MORE AMPLIFIED THAN THE CURRENT ONE AND WILL BRING DOWN

COLDER AIR ALOFT... FURTHER STEEPENING THE LAPSE RATES.

WOULD THEREFORE EXPECT SOME RATHER INTENSE LAKE ENHANCED CONVECTION

AS THIS FEATURE PASSES THROUGH BETWEEN 00Z AND 06Z. COVERAGE OF

CONVECTION MAY NOT BE PARTICULARLY GREAT... BUT THE SNOW SHOULD BE

QUITE HEAVY WHERE IT/S AT.

THE PASSAGE OF THAT WAVE MAY LEAD TO A SLIGHT LULL LATE TONIGHT INTO

FRIDAY MORNING. YET ANOTHER STRONG PV ANOMALY PIVOTS AROUND THE

UPPER LOW AND IMPACTS THE AREA FROM 18Z FRIDAY TO 06Z SATURDAY. THE

LOW LEVEL FLOW IS MORE WESTERLY AT THIS TIME AND THE ARCTIC AIR IS

FIRMLY IN PLACE. WILL HIT ACCUMULATIONS HARD DURING FOR AREAS

ALONG/SOUTH OF I-96 AND ALONG/WEST OF HWY 131.

IN ADDITION... THE COLDER SFC AIR SNEAKING AROUND THE BOTTOM OF THE

LAKE AND CURLING AROUND INTO FAR SRN LWR MI SHOULD ENHANCE LOW LEVEL

FGEN ON FRIDAY INTO FRIDAY EVENING. THIS IN COMBO WITH ELONGATED

AREA OF SFC CONVERGENCE COULD YIELD SOME IMPRESSIVE SNOW AMOUNTS

EVEN AS FAR EAST AS LAN/JXN... WHICH IS WHY THE LAKE EFFECT

HEADLINES ARE WIDER IN THE SRN CWFA THAN IN THE NORTH.

That is rare to see that far east. Basically to the DTX zones. They bumped up totals again as well for here. 7-14" zone and 12" point and click. They even have 5-10" for Jackson/Lansing..

So far about 2" inches.

Despite radar look the snow is coming down at a decent clip.

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Which means when this thing really gets cranking the snow is going to be coming down in boatloads, because right now the radar doesn't look that great and yet ground truth says otherwise.

Yeah, it's no longer a quesiton of if, but when and especially where.

The biggest change over the last 24 hours has been a delay in the worst of the snowfall until Friday evening. At least for us where the "snow is going to be coming coming down in boatloads" is the million dollar question, and is probably why DTX is keeping their totals somewhat subdued and broadbrushed.

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Yeah, I've got about 2" or more here so far. Point and click also give me 12". I don't know, im kinda skeptical about those amounts, but I guess we'll see.

I hear you. Once i see things really picking up and holding on i'll feel better about the amounts they are forecasting for here. I know areas on the south side by/just south of i94 got that with the 06-07 event but other then that one has to go back to Late Dec 2001 event for a 12+ LES event here. Ofcourse that was exceptional and this probably wont come close to it as that had the advantage of lasting a few extra days then this. Per models everything is there for 12 ( Or even more we get the i94 band set up ) or so here but we know how it goes with what models show and what happens.

Right now the flow appears to be a little to nw ( and or too much of a northerly component vs west ) for my liking but yeah i know it is supposed to back towards the west again as the night goes on.

Personally i am impressed with the call in Jackson/Lansing. Wonder what the most is they have gotten from a LES event? Imagine this has to be up there for them if all pans out?

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My point forecast for the next 36 hours:

Tonight: Snow showers. Low around 14. West northwest wind between 8 and 10 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of around 3 inches.

Friday: Snow showers. High near 21. West wind between 7 and 10 mph. Chance of precipitation is 100%. New snow accumulation of around 4 inches.

Friday Night: Snow showers, mainly before 1am. Low around 15. West wind between 6 and 9 mph. Chance of precipitation is 90%. New snow accumulation of around 5 inches.

We have about 3 or 4 inches on the ground and it has been snowing intermitently (spelling) all day. Probably picked up about an inch. It is nice to be in the snow belt again, especially after watching my 12in. snowpack in Chicago melt on new years. Here's to hoping this works, sounds like MI has had a pretty dull winter so this could easily be the largest event.

Edit: I should mention I am in GR. For now the band has definitely quieted down a lot and most of the best stuff has been to the south of us today. Let's see what happens tonight. Here's to somebody in MI getting nailed!

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LES in Most of Mich looks like it pretty much tapering off a bit except in Isolated areas in SWMI and NWMI

Yep and pretty much as expected. The next wave is now just dropping in. Thus we *should* see a ramp up in a short bit and or next hour or 2. Thats what GRR has been saying anyways. Guess we will see. Then another lull is expected till Friday afternoon which is when the main show arrives.

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Total so far today here is 1.5" of fluffy snow, thats measuring every 6 hours, actual depth from settling is a little less, just a tad over 1". Nevertheless, its a sparkly wintry evening. Snowing off and on all day basically, the short-tip grass is almost covered, and even though the longer grass areas still have very noticeable pickers (especially in non-residential areas), it looks like winter again after a 5-day hiatus!

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