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Feb. 19th-22nd Winter Storm Part 2


wisconsinwx

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Yeah unless the other models trend toward it, I would lean towards it being crap, especially since the GGEM was south by a considerable margin.

Well to be fair the 0Z GGEM also tracks the low along the MN border, but yeah, hard to believe it at this point. That northern vortex looks too strong to allow that type of development. The 0Z GFS op was one of the farther S solutions--interested to see what the 06Z does. GFS has been pretty good with this storm--IMO--the last two days in terms of overall consistency and has kept all its solutions through Iowa.

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Prins, do you think that would be rain here? Or would it be snow? Hard to tell.

probably a mix for a time...hell, if the rgem is anywhere close than my area would be in the mix. Probably be all different on the 12z run. The 0z ggem was riding the mn/ia border too i thought...gotta go back and look. I can't believe i stay up for this stuff...lol

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Well to be fair the 0Z GGEM also tracks the low along the MN border, but yeah, hard to believe it at this point. That northern vortex looks too strong to allow that type of development. The 0Z GFS op was one of the farther S solutions--interested to see what the 06Z does. GFS has been pretty good with this storm--IMO--the last two days in terms of overall consistency and has kept all its solutions through Iowa.

Yeah, this is one of the types of setups where I shy away from the GEM both R and G due to it being mostly southern stream dominant energy.

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Same here, just waiting for the new MKE AFD (should be out by 4 AM hopefully) and the 6z GFS. Crazy what a storm like this could do to you.

Also, a good movie helps pass the time by.

Yeah, earlier today I watched Twister in HD for the first time (I know welcome to 2008). But man that movie is about 1000x better in HD.

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La Crosse going with 8-15 for their area. Milwaukee upgraded the southern counties to the WSW.

...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING

THROUGH LATE SUNDAY NIGHT...

A WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING

THROUGH LATE SUNDAY NIGHT.

* TIMING...SUNDAY MORNING THROUGH SUNDAY NIGHT. SNOW MAY MIX WITH

FREEZING RAIN SOUTH OF A PORT WASHINGTON TO BARABOO LINE IN THE

AFTERNOON.

* TOTAL SNOW ACCUMULATIONS...6 TO 12 INCHES...THE HIGHEST AMOUNTS

NORTH OF A PORT WASHINGTON TO BARABOO LINE.

* WINDS...EAST 10 TO 15 MPH...BECOMING NORTHEAST 10 TO 20 MPH

SUNDAY NIGHT.

* IMPACTS...TRAVEL COULD BECOME DIFFICULT ACROSS THE AREA...WITH

DECENT SNOW ACCUMULATIONS LIKELY. VISIBILITIES MAY BE REDUCED TO

1/4 MILE AT TIMES IN HEAVIER SNOW.

La Crosse:

...WINTER STORM WARNING IN EFFECT FROM 6 AM SUNDAY TO 6 AM CST

MONDAY...

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A WINTER

STORM WARNING FOR HEAVY SNOW AND SLEET...WHICH IS IN EFFECT FROM

6 AM SUNDAY TO 6 AM CST MONDAY. THE WINTER STORM WATCH IS NO

LONGER IN EFFECT.

* SNOW WILL DEVELOP BY SUNDAY MORNING AND WILL BE HEAVY AT TIMES.

SOME MIX OF FREEZING RAIN OR SLEET IS ALSO EXPECTED.

PRECIPITATION WILL BE ENTIRELY SNOW BY SUNDAY NIGHT AS COLDER

AIR MOVES IN.

* TOTAL SNOWFALL ACCUMULATIONS OF 8 TO 15 INCHES ARE POSSIBLE.

* VERY POOR VISIBILITIES ARE LIKELY ON SUNDAY WHEN THE HEAVIEST

SNOW IS EXPECTED.

* THE SNOW WILL MAKE FOR TREACHEROUS DRIVING CONDITIONS. IN

ADDITION...LOOK FOR THE SNOW TO BE WET AND HEAVY...MAKING IT

SLIPPERY AND MORE DIFFICULT TO MOVE.

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Mpx forecast for Mankato. :popcorn: Hopefully no major shifts from now on.

Tonight- A chance of snow and light freezing rain in the evening...then snow and light freezing rain after midnight. Snow accumulation of 1 to 2 inches. Ice accumulation up to one tenth of an inch. Lows 20 to 25. East winds 5 to 15 mph.

Sunday- Breezy...snow. Areas of blowing and drifting snow. Snow may be heavy at times in the morning. Snow accumulation of 7 to 9 inches. Highs 25 to 30. Northeast winds 15 to 25 mph.

Sunday Night- Breezy. Snow in the evening...then snow likely after midnight. Areas of blowing and drifting snow through the night. Snow accumulation around 3 inches. Storm total snow accumulation of 11 to 14 inches. Lows around 15. North winds 15 to 25 mph.

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nws buffalo thinks qpf amounts are overdone :unsure:

MAIN FOCUS THROUGH THE SHORT TERM PERIOD WILL REVOLVE AROUND A

FAIRLY POTENT SYSTEM FOR SUNDAY NIGHT AND MONDAY MORNING. 00Z MODEL

GUIDANCE SUITE CONTINUES TO CONVERGE ON A COMMON SOLUTION WITH THIS

SYSTEM...WITH THE NAM/GFS/GEM ALL VERY SIMILAR WITH THE LARGE SCALE

FEATURES. LEE CYCLOGENESIS WILL TAKE PLACE ON THE COLORADO PLAINS

TONIGHT...AND THE SUBSEQUENT LOW WILL TRACK EAST ACROSS THE MID

SECTION OF THE NATION BEFORE CROSSING NORTHERN INDIANA/OHIO LATE

SUNDAY NIGHT AND CENTRAL OR NORTHERN PENNSYLVANIA MONDAY MORNING.

THE MID LEVEL CLOSED LOW ASSOCIATED WITH THIS FEATURE WILL RAPIDLY

OPEN UP AND WEAKEN AT THE EXPENSE OF A SHARPENING MID LEVEL TROUGH

OVER QUEBEC. THE MAIN FORCING MECHANISM THEN WILL BE A BROAD AREA OF

MODERATE ISENTROPIC UPGLIDE SUPPORTED BY A DIFFERENTIAL THERMAL

ADVECTION PATTERN AS WARMER AIR OVER THE OHIO VALLEY TRIES TO PUSH

NORTH ALOFT...WHILE A MUCH COLDER AIRMASS ADVANCES SOUTH OUT OF

CANADA IN THE LOW LEVELS. EMBEDDED WITHIN THIS LARGE AREA OF LIFT

WILL LIKELY BE ONE OR TWO BANDS OF STRONG MESOSCALE ASCENT SUPPORTED

BY STRETCHING DEFORMATION AND FRONTOGENESIS IN THE 850-700MB LAYER.

EXPECT SNOW TO OVERSPREAD THE AREA SUNDAY EVENING FROM WEST TO EAST

AND CONTINUE THROUGH THE NIGHT...BEFORE TAPERING OFF FROM NORTH TO

SOUTH DURING THE DAY ON MONDAY. DIFFICULT CALL ON PRECIP TYPE WITH

THE GFS AND CANADIAN GEM BRINGING A WARM LAYER ALOFT INTO THE

SOUTHERN TIER OVERNIGHT INTO MONDAY MORNING...WHILE THE NAM IS

COLDER. PAST HISTORY WITH THIS TYPE OF SYSTEM HAS SHOWN THAT WARM

AIR SPREADS NORTH FASTER AND FARTHER THAN FORECAST THE VAST MAJORITY

OF THE TIME. WITH THIS IN MIND...WILL ALLOW WARM AIR ALOFT TO SPREAD

EVEN FARTHER NORTH THAN THE NORTHERNMOST MODEL GUIDANCE. EXPECT SNOW

TO MIX WITH SLEET OVERNIGHT AS FAR NORTH AS THE NY THRUWAY...WITH

SLEET AND FREEZING RAIN SOUTH OF THAT AND A CHANGE TO MAINLY

FREEZING RAIN ACROSS THE WESTERN SOUTHERN TIER. BEST CHANCE TO STAY

ALL SNOW WILL BE IN THE ROW OF COUNTIES ALONG THE SOUTH SHORE OF

LAKE ONTARIO AND OF COURSE THE NORTH COUNTRY. BY EARLY AFTERNOON

WEDNESDAY STRONG COLD AIR ADVECTION WILL TAKE HOLD...CHANGING ALL

THE PRECIP BACK TO SNOW BEFORE TAPERING OFF FROM NORTH TO SOUTH.

AS FAR AS AMOUNTS GO...OVERALL MODEL QPF LOOKS OVERDONE. EXPECT MOST

AREAS TO REALIZE LIQUID EQUIVALENTS OF A THIRD TO A HALF INCH...

WHICH IS ABOUT 30 PERCENT OR SO BELOW A GFS/NAM BLEND. THIS WOULD

SUPPORT ADVISORY CRITERIA SNOW IN MOST AREAS...WITH THE LIGHTEST

AMOUNTS ACROSS THE NORTH COUNTRY FARTHER DISPLACED FROM THE STRONGER

FORCING. THAT SAID...THERE MAY BE A BAND OF ENHANCED QPF IF

MESOSCALE BANDING STRUCTURES FORM SUPPORTED BY THE STRONG

FGEN/DEFORMATION SIGNAL. IF THIS OCCURS THERE MAY BE A NARROW AXIS

OF HEAVIER SNOWFALL APPROACHING WARNING CRITERIA...BUT THIS WOULD

PROBABLY ONLY BE ABOUT A COUNTY WIDE AND IMPOSSIBLE TO PINPOINT AT

THIS TIME RANGE. ACROSS THE WESTERN SOUTHERN TIER...THE WINTRY MIX

WILL LIKELY HOLD SNOW AMOUNTS DOWN. IF PTYPE GOES TO FREEZING RAIN

QUICKLY...MAY SEE UP TO A THIRD OF AN INCH OF ICING.

THE BAROCLINIC ZONE WITH THIS SYSTEM IS VERY TIGHT...MEANING THAT

JUST A SMALL CHANGE IN THE SURFACE LOW TRACK WILL PRODUCE A BIG

CHANGE IN THE THERMAL PROFILES AND EXPECTED PRECIP TYPES. OVERALL

HIGH BUST POTENTIAL IN BOTH DIRECTIONS ON PTYPE AND SNOW/ICE AMOUNTS

BECAUSE OF THIS.

FINALLY...ONE OTHER CONCERN IS LAKE ENHANCEMENT MONDAY MORNING. MUCH

COLDER AIR WILL BE CAPTURED BY THE CIRCULATION OF THIS SYSTEM...WITH

NORTHEAST WINDS BECOMING NORTH ALONG THE SOUTH SHORE OF LAKE

ONTARIO. INSTABILITY IS NOT ALL THAT IMPRESSIVE WITH A VERY SHALLOW

COLD AIRMASS INITIALLY...BUT IN A SATURATED LOW LEVEL ENVIRONMENT IT

DOES NOT TAKE MUCH. THIS MAY ADD A FEW INCHES TO THE SNOW TOTALS

ALONG THE SOUTH SHORE OF LAKE ONTARIO FROM NIAGARA TO WESTERN OSWEGO

COUNTY...INCLUDING THE GREATER ROCHESTER AREA.

TEMPS WILL FALL DURING THE DAY MONDAY SUPPORTED BY STRONG COLD AIR

ADVECTION...DROPPING INTO THE LOW TO MID TEENS BY EARLY EVENING AND

SINGLE DIGITS EAST OF LAKE ONTARIO.

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Hopefully we can shake that warm layer (as much as 2-3*C deep) between 850mb and 700mb. That does in fact scream sleet as the NAM suggests.

It doesn't help either that the models continue to gradually remove the omega bullseye from the DGZ. At least in that case the melting process would have helped cooled the colum dynamically.

GFS doesn't have one as deep (0*C to 1*C) thus it gives us 95% snow (other than nearly 1.3" of snow, there's a glazing of .06" freezing rain as well).

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