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January 31-February 2 MAJOR Winter Storm


Powerball

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I can't like you for 6 hrs NAM.. That shift it was I get for saying I liked the NAM for this storm.. lol. Hopefully just a blip.. WAA snows look nice but who knows how that sets up. Gawd I just want like 6" or so somehow so we can take the snowmobiles out and not have to go to the chiro the next day.

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HPC agrees with the Euro/UKMET:

12Z MODEL EVALUATION INCLUDING THE NEW ECMWF AND FINAL PREFERENCES

...UPPER TROUGH FORMING ACROSS THE INTERMOUNTAIN WEST/ROCKIES

THROUGH THE PERIOD...

PREFERENCE: MIDWAY BETWEEN THE UKMET/ECMWF

THE NAM AND GFS HAVE POTENTIALLY SIGNIFICANT INITIALIZATION ERRORS

OVER BRITISH COLUMBIA...

WITH THE NAM TOO WEAK AND NORTHEAST WITH THE CENTER OF THE

DEVELOPING SHORTWAVE TROUGH...

AND GFS TOO STRONG AND SOUTH...WHILE THE UKMET/ECMWF INITIALIZE

THE BEST. THESE ERRORS APPEAR TO CONTRIBUTE TO GROWING DIFFERENCES

OVER TIME...WITH THE NAM MOVING TOWARD THE DEEP EDGE OF THE

GUIDANCE AS THE LOW BEGINS TO CUTOFF OVER MONTANA WHILE THE GFS

MOVES PROGRESSIVELY TOWARD THE FAST EDGE OF THE GUIDANCE.

MEANWHILE...THE NEW ECMWF AND UKMET APPEAR TO BE CONVERGING TOWARD

EACH OTHER...AND GIVEN COMPARABLE INITIALIZATIONS...ALONG WITH

THEIR RELATIVE POSITIONS WITHIN THE SOLUTION ENVELOPE WHICH WHEN

AVERAGED REPRESENT THE CONSENSUS...THE RECOMMENDATION IS FOR A

SOLUTION ABOUT MIDWAY BETWEEN THE UKMET/ECMWF.

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Green Bay... Not sure why I'm posting it.. Guess becasue of LES potential

LONG TERM

SUNDAY NIGHT THRU NEXT SATURDAY. MAIN FORECAST

CONCERNS ARE LAKE EFFECT SNOW POTENTIAL MON NIGHT/TUESDAY...THEN

TRACK OF MAJOR STORM SYSTEM MID-WEEK.

FIRST CONCERN WILL BE DEALING WITH SNOW CHANCES/AMOUNTS FROM

MONDAY THRU TUESDAY. BAROCLINC ZONE WILL REMAIN SITUATED ACROSS

THE SOUTHERN GREAT LAKES...AS A UPPER TROF DIGS INTO THE SOUTHERN

PLAINS. THE WESTERN GREAT LAKES WILL BE IN THE RRQ OF A DEPARTING

JET ACROSS SOUTHERN CANADA...THEN IN THE LFQ OF A JET NOSING IN

FROM PLAINS. THIS WILL ENHANCE LARGE SCALE LIFT...AND ISENTROPIC

LIFT AND WARM AIR ADVECTION NORTH OF THE WARM FRONT WILL CREATE A

WIDESPREAD AREA OF LIGHT SNOW. VERY DEEP DENDRITIC GROWTH REGION

SETS UP ACROSS THE AREA ON MONDAY AS WELL...POSSIBLY ENHANCING

SNOW RATIOS. ONE NEGATIVE WILL BE THE DRY AIR CAMPED OUT OVER

ONTARIO WHICH WILL TRY TO FEED INTO THE AREA ON THE NE WIND. THINK

FAR NE WI WILL BE AFFECTED BY THIS THE MOST...SO WILL KEEP POPS

AND QPF AMOUNTS LOWER THAN THE REST OF THE AREA. WILL BUMP UP POPS

ACROSS CENTRAL AND EAST CENTRAL WI ON MONDAY AND MONDAY NIGHT AS

ALL THE INGREDIENTS COME TOGETHER HERE. THIS WILL BE A PROLONGED

LIGHT SNOW EVENT...WITH THE ONLY CHANCE FOR HEAVIER SNOW CONFINED

TO THE LAKESHORE WITH LAKE BAND.

SPEAKING OF LAKE EFFECT POTENTIAL...SETUP IS LOOKING FAVORABLE

FOR A PROLONGED LAKE EFFECT SNOW EVENT ACROSS THE LAKE MICHIGAN

SHORELINE MONDAY AFTERNOON THRU TUESDAY MORNING. WINDS START OFF

OUT OF THE ENE/E MONDAY MORNING...WHICH IS NOT A FAVORABLE

FETCH...BUT WINDS WILL BACK TO THE NE OVERNIGHT AND INTO TUESDAY

MORNING...PRODUCING A LONGER FETCH AND MORE FAVORABLE CONDITIONS

FOR A LAKE BAND TO SETUP. LAKE TEMPS ARE HOVERING AROUND 2-4C

ACROSS MID-LAKE...COMBINED WITH 850MB TEMPS GENERALLY BETWEEN -14C

AND -16C...WILL CREATE DELTA T/S IN THE 15-20 RANGE. AREA AT MOST

RISK WILL BE KEWAUNEE AND MANITOWOC COUNTIES...WHEN THE NE WIND

SETS UP. WILL HIGHLIGHT THIS THREAT IN THE HWO...BUT WILL NOT

ISSUE ANY HEADLINES WITH THIS FORECAST PACKAGE...BUT AN ADVISORY

TYPE EVENT IS LIKELY STARTING MONDAY. BLOWING AND DRIFTING SNOW

COULD BECOME A PROBLEM AS NE WINDS RAMP UP MONDAY NIGHT AND

TUESDAY...ESPECIALLY NEAR THE LAKESHORE.

WHILE LAKE EFFECT CONCERNS ARE ONGOING...THE MAIN SYSTEM WILL

EJECT OUT OF THE PLAINS TUESDAY...AND WORK INTO THE OHIO VALLEY

ON WEDNESDAY. MODEL CONSENSUS CONTINUES TO KEEP THE MAJORITY OF

THE SYNOPTIC SNOWFALL SOUTH OF THE CWA...HOWEVER ANY JOG TO THE

NORTH WILL CAUSE THE HEAVY SNOW BAND TO SHIFT INTO NE WI.

SOMETHING TO KEEP AN EYE ON WITH NEW MODEL RUNS AND THIS SYSTEM

GETS BETTER SAMPLED BY THE RAOB NETWORK. FOR NOW WILL KEEP 30/40

POPS ACROSS CENTRAL AND EAST CENTRAL WI...WITH HIGHER POPS NEAR

THE LAKESHORE.

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Yeah agreed--the huge shift is due to the northern stream tracking E faster--and it looks suspect on the NAM. I would tend to throw it out--but the southern stream PV max is more realistic. This storm is amazing either way we look at it.

I know some think this is bunk but i strongly believe that the quicker the NAO/AO rise the better the odds are that this comes further nw. Keep in mind of how they ( especially the AO ) relate to that PV/Northern stream.

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La Crosse and just some WAA talk.

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE LA CROSSE WI

235 PM CST SAT JAN 29 2011

SHORT TERM

TONIGHT THROUGH TUESDAY

SHORT TERM FORECAST FOCUS IS ON A SNOW EVENT TO START UP AROUND

MIDNIGHT SUNDAY...PERSISTING THROUGH MONDAY NIGHT. SEVERAL

INCHES OF ACCUMULATION LIKELY.

ON MONDAY...THE 12Z GFS/NAM POINT TO AN ELONGATED PIECE OF UPPER

LEVEL ENERGY STRETCHING FROM THE NORTHERN PLAINS INTO SOUTHERN

CANADA...WITH SOME HINTS THAT BITS OF SHORTWAVE ENERGY WOULD

SPIN OUT OF A DEEPER TROUGH OVER THE ROCKIES...TO ACROSS IA BY

MONDAY EVENING. OVERALL...THE SHORTWAVE FORCING LOOKS RELATIVELY

MEAGER FOR THE LOCAL AREA IN THIS TIME FRAME. HOWEVER...A BIT

FARTHER A LOFT...THE RIGHT ENTRANCE REGION OF A JET STREAK IS

PROGGED TO BE ACROSS THE REGION BY 00Z TUE. THIS WOULD ENHANCE ANY

AVAILABLE LIFT...AND THERE DOES APPEAR TO BE LIFT...

THERMODYNAMICALLY. LOOKING AT THE 850-700 MB LAYER A BROAD WEST-EAST

REGION OF WARM AIR ADVECTION SETS UP ACROSS SOUTHERN MN/IA INTO WI

AND ILL FROM 06Z MON-00Z TUE. A SIMILAR SWATH OF LONG LIVED

ISENTROPIC UPGLIDE ON THE 280-295 K SFCS IS ALSO INDICATED IN THE

SAME LOCATION/TIME FRAME. THE FORCING ISN/T OVERLY STRONG...BUT

ENOUGH TO PRODUCE SOME PCPN WITH DEEP ENOUGH MOISTURE. WEST-EAST

RUNNING X-SECTION SHOWS AN INCREASING SATURATED ATMOSPHERE BY 06Z

MON...HOLDING ACROSS THE REGION THROUGH TUES. AMPLE FOR SNOW

PRODUCTION...AND A LONG-LIVED SNOW EVENT LOOKS LIKELY FROM LATE

SUNDAY NIGHT THROUGH MON NIGHT.

OF PARTICULAR INTEREST WITH THIS SYSTEM IS THE THERMAL PROFILE IN

THE VERTICAL. 12Z BUFKIT GFS AND NAM SOUNDINGS DURING THIS SNOW

EVENT SIT SQUARELY IN THE FAVORABLE DENDRITIC GROWTH ZONE REGION OF

-12 TO -18 FROM NEAR THE SFC TO AS MUCH AS 12 KFT. AN INCREDIBLY

DEEP LAYER FOR PRODUCING DENDRITES...WHICH LEAD TO GREATER

ACCUMULATIONS. WINDS THROUGH 5 KFT DO INCREASE FOR THIS SAME PERIOD

THOUGH...WHICH COULD SERVE TO BREAK APART LARGER FLAKES...AND

PERHAPS LIMIT THE AGGREGATION POTENTIAL. IF THE FORCING WAS

STRONGER...ESPECIALLY IF THERE WAS AN INDICATION OF STRONG

FRONTOGENETIC BANDING...HEAVY SNOW WITH SIGNIFICANT AMOUNTS COULD BE

COUNTED ON. HOWEVER...THAT ISN/T THE CASE...AT THE MOMENT.

STILL...SEVERAL INCHES OVER 24-30 HOURS LOOKS REASONABLE...WITH COBB

OUTPUT OF 4 TO 6 INCHES. SOME 8 INCH AMOUNTS APPEAR POSSIBLE FOR

SOUTHEAST MN/NORTHEAST IA...ALTHOUGH MORE IN THE 30 HOUR PERIOD.

THIS WOULD PUT IT OUTSIDE OF WARNING CRITERIA...ALTHOUGH SOME

CONSIDERATION IS GIVEN TO THE POTENTIAL FOR A WATCH FOR THESE AREAS.

MORE LIKELY...SEE THE NEED FOR A WINTER WEATHER ADVISORY FOR

SOMETHING AROUND THE 06Z MON - 12Z TUES TIME FRAME. WILL GIVE IT

ONE...TWO MORE SHIFTS TO REFINE THE SCIENCE AND MODEL SOLUTIONS...

BUT SOME SORT OF HEADLINE DOES LOOK PROBABLE WITH THIS SNOW EVENT.

LIGHT SNOW COULD LINGER ON TUESDAY...BUT BELIEVE THE BULK OF THE

ACCUMULATIONS WILL BE FROM OVERNIGHT SUNDAY THROUGH MONDAY

EVENING.

LONG TERM

TUESDAY NIGHT THROUGH SATURDAY

THE MAIN CONCERN IN THE LONG TERM PORTION OF THE FORECAST IS A

SIGNIFICANT STORM SYSTEM PROGGED TO SWING EAST OUT OF THE

ROCKIES...ACROSS THE SOUTHERN PLAINS...AND THEN OVER THE OH RIVER

VALLEY ON WED. GOOD SURGE OF MOISTURE AHEAD AND INTO THE

SYSTEM...AND THE GFS/EC HAS THIS SYSTEM PACKING A PRETTY GOOD PUNCH.

LOCALLY...THE CONCERN IS HOW FAR NORTH IT WILL TRACK...AND WILL IT

HAVE AN IMPACT ON THE LOCAL AREA. TRENDS WOULD KEEP THE HEAVIER

BANDS OF SNOW ON THE NORTH SIDE OF THE LOW ACROSS MO/IA/ILL. THE EC

IS THE FARTHER NORTH OF THE TWO MODELS...AND THUS SHOWS A GREATER

POTENTIAL FOR ACCUMULATIONS...POSSIBLY SIGNIFICANT...ACROSS

PORTIONS OF NORTHEAST IA/SOUTHWEST WI. WILL LIKELY HOLD WITH THE

MODEL CONSENSUS SOLUTION FOR NOW.

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from MPX :thumbsup:

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN

328 PM CST SAT JAN 29 2011

...LONG DURATION SNOWFALL EXPECTED SUNDAY EVENING THROUGH MONDAY

NIGHT FROM WEST CENTRAL TO SOUTH CENTRAL MINNESOTA...

.A WINTER STORM WATCH IS IN EFFECT FROM SUNDAY EVENING UNTIL

MONDAY NIGHT FOR AREAS IN WEST CENTRAL TO SOUTH CENTRAL MINNESOTA.

BETWEEN 6 AND 8 INCHES OF SNOW COULD FALL IN LOCATIONS GENERALLY

NEAR OR SOUTHWEST OF A LINE FROM MORRIS...TO WILLMAR...TO

FARIBAULT OVER A 24 HOUR PERIOD. A WINTER SYSTEM WILL TAKE SHAPE

IN THE NORTHERN PLAINS SUNDAY AFTERNOON AND SPREAD SNOW INTO WEST

CENTRAL MINNESOTA SUNDAY EVENING. STEADY MODERATE TO HEAVY SNOW IS

EXPECTED TO CONTINUE INTO MONDAY BEFORE TRANSITIONING TO LIGHT

SNOW MONDAY NIGHT.

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Norman AFD is some good :weenie: porn. :popcorn:

COLD SFC HIGH HAS BUILT NICELY OVER CANADA AND WILL PROVIDE THE

COLD AIR THROUGH MONDAY TO SET UP A POTENTIAL MAJOR MESS MONDAY

NIGHT AND TUESDAY. WINTER STORM WATCH IS INEVITIBLE BUT WE WILL

HOLD OFF FOR NOW DUE TO THE WORST OF THE EVENT LIKELY UNFOLDING IN

PERIODS 5/6. STILL MANY VARIABLES AND UNCERTAINTIES REGARDING

PRECIP TYPE AND AMOUNTS - ANOTHER REASON WE ARE HOLDING OFF ON

HEADLINES FOR THE TIME BEING. IT LOOKS LIKE A TRANSITION FROM

RA/DZ TO ICE TO SNOW WILL BE RATHER SWIFT AS THE COLD AIR POURS IN

MONDAY NIGHT AND TUESDAY MORNING. LARGE-SCALE PATTERN FAVORS HEAVY

SNOW SOMEWHERE ACROSS THE AREA BUT TRACK OF UPPER SYSTEM IS

UNCERTAIN AND THEREFORE SO IS THE LOCATION OF THE HEAVIEST

ACCUMULATIONS. STRONG WINDS LEADING TO BLOWING/DRIFTING SNOW AND

POSSIBLY BLIZZARD OR NEAR-BLIZZARD CONDITIONS SOME AREAS BY

TUESDAY... AND DANGEROUS WIND CHILLS -10 TO -20 BY WED MORNING.

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Wow, you would rather have a big, large, devestating ice storm over plain rain? Seriously?

MKE going with 3-6 here for the WAA snows.

If i had no power lines/power poles so close to my house i wouldn't mind seing such a Ice storm as well. Thus i would take it over the rain IF that were the case. As IS...NO.

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SPECIAL WEATHER STATEMENT...CORRECTED

NATIONAL WEATHER SERVICE ST LOUIS MO

257 PM CST SAT JAN 29 2011

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-

034>036-041-042-047>052-059>065-072>075-084-085-099-301015-

GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-

MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-

CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO-

LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-

AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-

LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-

ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-

WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-

MADISON MO-REYNOLDS MO-

INCLUDING THE CITIES OF...LITCHFIELD...VANDALIA...SALEM...

CHESTER...QUINCY...EDWARDSVILLE...BELLEVILLE...HANNIBAL...

BOWLING GREEN...COLUMBIA...MEXICO...JEFFERSON CITY...ST CHARLES...

UNION...ST LOUIS...FARMINGTON

257 PM CST SAT JAN 29 2011

...SIGNIFICANT ACCUMULATIONS OF ICE AND SNOW POSSIBLE MONDAY

THROUGH WEDNESDAY...

THE LATEST RUNS OF THE COMPUTER MODELS CONTINUE TO SHOW THAT A

MAJOR WINTER STORM WILL LIKELY BRING AN EXTENDED PERIOD OF

ACCUMULATING ICE AND SNOW TO THE REGION EARLY NEXT WEEK. THERE

CONTINUES TO BE DIFFERENCES BETWEEN THE COMPUTER MODELS ON THE

EXACT STRENGTH AND TRACK OF THIS STORM SYSTEM. THESE DIFFERENCES

WILL ULTIMATELY DETERMINE WHETHER THE PRECIPITATION WILL FALL AS

FREEZING RAIN...SLEET OR SNOW AND HOW MUCH OF EACH.

AT THIS TIME...LIGHT FREEZING DRIZZLE IS EXPECTED TO DEVELOP OVER

CENTRAL AND NORTHEAST MISSOURI ON SUNDAY NIGHT WELL AHEAD OF THE

SYSTEM WITH A MIX OF WINTRY PRECIPITATION SPREADING ACROSS MUCH

OF THE AREA MONDAY AND MONDAY NIGHT. SOME LIGHT SNOW ACCUMULATION

IS EXPECTED ALONG AND NORTH OF INTERSTATE 70 ALONG WITH SOME LIGHT

ICE ACCUMULATION ALONG AND SOUTH OF INTERSTATE 70.

THE PRECIPITATION WILL BECOME STEADY AND HEAVY AT TIMES DURING

THE DAY TUESDAY. NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS WILL

LIKELY SEE ALL SNOW...WHILE LOCATIONS IN SOUTHEAST MISSOURI AND

SOUTHERN ILLINOIS WILL TEND TO SEE A MIX OF SLEET AND FREEZING

RAIN. THE HEAVIEST PRECIPITATION APPEARS LIKELY TO OCCUR ON

TUESDAY AND TUESDAY NIGHT AND WILL RESULT IN A RAPID ACCUMULATION

OF HEAVY SNOW AND ICE. PRECIPITATION WILL GRADUALLY CHANGEOVER TO

ALL SNOW TUESDAY NIGHT AND TAPER TO FLURRIES ON WEDNESDAY.

NORTHERLY WINDS WILL INCREASE TUESDAY INTO WEDNESDAY WHICH MAY

CAUSE SOME BLOWING AND DRIFTING SNOW. IN ADDITION...BITTERLY COLD

AIR WILL MOVE INTO THE REGION WITH LOW TEMPERATURES DIPPING INTO

THE SINGLE DIGITS BOTH WEDNESDAY AND THURSDAY NIGHT WITH BELOW

ZERO WIND CHILLS.

THERE CONTINUES TO BE SOME UNCERTAINTY WITH HOW MUCH AND WHAT TYPE

OF PRECIPITATION WILL FALL AT ANY GIVEN LOCATION. HOWEVER IT DOES

LOOK LIKELY THAT A MAJOR WINTER STORM WILL IMPACT THE AREA EARLY

NEXT WEEK. WINTER STORM WATCHES AND WARNINGS WILL LIKELY BE ISSUED

FOR THIS STORM LATER TONIGHT OR ON SUNDAY. STAY TUNED TO NOAA

WEATHER RADIO OR YOUR LOCAL MEDIA FOR THE LATEST FORECAST.

$$

BRITT

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If i had no power lines/power poles so close to my house i wouldn't mind seing such a Ice storm as well. Thus i would take it over the rain IF that were the case. As IS...NO.

What if your home is all electric like mine...no gas! No thanks, I'll take the plain rain over that!

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Wow, you would rather have a big, large, devestating ice storm over plain rain? Seriously?

at this point, yes. I will take my chances. If it is ice so be it, but I want it to come SE. That's the risk ya take here if you want snow lol

I liked it better when there was just an Ohio thread.

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ARX hit the potential for the farther northwest areas (wherever they may end up being in this storm). Just a huge DGZ depicted on the 12z Bufkit soundings (400+ mb deep!). Even the lighter QPF on the far southeast solutions yield several inches of snow, because of the extreme ratios this DGZ would tend to produce. Another factor to why the northwest cut off to snow accumulations should not be as great with this storm.

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ARX hit the potential for the farther northwest areas (wherever they may end up being in this storm). Just a huge DGZ depicted on the 12z Bufkit soundings (400+ mb deep!). Even the lighter QPF on the far southeast solutions yield several inches of snow, because of the extreme ratios this DGZ would tend to produce. Another factor to why the northwest cut off to snow accumulations should not be as great with this storm.

Good to hearthumbsupsmileyanim.gif

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An ice storm would destroy the community, be bad for the economy etc. I've been through .35-.4 inch of ice or so, and it shut the city down for a few days. I couldn't imagine over 2 inches of ice.

Ive been there done that. Dec 2004 was a devastating ice storm, this one looks like it could be worse.

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Wow, you would rather have a big, large, devestating ice storm over plain rain? Seriously?

MKE going with 3-6 here for the WAA snows.

Not sure how MKE can have High Confidence in anything let alone the long range and storm.

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

336 PM CST SAT JAN 29 2011

SHORT TERM

TONIGHT-FORECAST CONFIDENCE MEDIUM

A SHORT WAVE TROUGH OVER SOUTHEAST SD WILL TRACK ACROSS NORTHERN IA

LATE THIS AFTERNOON/EARLY EVENING...AND WEAKEN AS IT GETS TO

NORTHERN IL TONIGHT. A SWATH OF LIGHT SNOW ASSOCIATED WITH THIS

SHORTWAVE STRETCHED FROM SOUTHERN MN TO NORTHEAST IOWA. THERE HAVE

BEEN A FEW REPORTS OF FREEZING DRIZZLE AND FLURRIES JUST NORTH OF

THIS SNOW SWATH...SO KEPT FREEZING DRIZZLE POTENTIAL IN THE

SOUTHWEST COUNTY WARNING AREA /CWA/ THROUGH LATE AFTERNOON. RUC

MODEL SNDGS SUPPORT FREEZING DRIZZLE SOUTHWEST OF MSN THIS

AFTERNOON.

AS COLDER AIR WORKS INTO THE REGION FROM THE NORTH...THE FREEZING

DRIZZLE POTENTIAL GOES AWAY FOR THE EVENING HOURS. BY THE

EVENING...THINKING THAT THE SNOW ASSOCIATED WITH THE SHORTWAVE WILL

CLIP THE SOUTHERN COUNTIES THIS EVENING AND BE OUT OF THE AREA BY

MIDNIGHT. SNOW AMOUNTS SHOULD REMAIN LESS THAN ONE HALF INCH...WITH

ANOTHER EVENT STRUGGLING TO MEASURE QPF WISE.

ORIGINALLY IT LOOKED LIKE A DECENT LAKE EFFECT POTENTIAL FOR AT

LEAST SHEBOYGAN THIS AFTERNOON...AND POSSIBLY SPREADING SOUTHWARD

INTO MKE. LAKE TEMPS ARE AROUND 36 TO 38 DEGREES /2-4C/...AND 850MB

TEMPS NEAR SBM ARE AROUND -10C...SO MARGINAL DELTA-T FOR LAKE

EFFECT...BUT WIND DIRECTION REMAINS THE PROBLEM. BASED ON GREEN BAY

RADAR AND SURFACE OBS TO THE NORTH...THE LAKE EFFECT SNOW IS NOT

DEVELOPING AND WINDS ARE GENERALLY NORTHWEST ALONG THE LAKESHORE.

THEREFORE...BACKED OF SIGNIFICANTLY ON LAKE EFFECT SNOW CHANCES NEAR

THE LAKE...KEEPING ONLY A SLIGHT CHANCE OF SNOW SHOWERS ALONG THE

LAKE FOR MUCH OF THE NIGHT. DEPENDING ON IF ANYTHING DEVELOPS LATER

THIS EVENING...WE MAY NEED TO REMOVE ANY MENTION OF SNOW OR FLURRIES

OVERNIGHT. ESPECIALLY IF WINDS ONLY VEER NORTH INSTEAD OF GOING

NORTHEAST.

WITH COLD AIR ADVECTION...TEMPS IN THE NORTHERN CWA MAY DIP INTO THE

MID TO LOWER TEENS. HOWEVER...THE DENSE CLOUD COVER MAY KEEP TEMPS A

LITTLE WARMER THAN EXPECTED.

SUNDAY-FORECAST CONFIDENCE MEDIUM

WINDS WILL FINALLY SWITCH TO THE NORTHEAST AROUND 18Z...SO THERE IS

POTENTIAL FOR A N-S ORIENTED MID LAKE BAND THAT COULD SWING WESTWARD

AND CLIP SOUTHEAST WI IN THE AFTERNOON. OTHERWISE...RH PLOTS SHOW A

BRIEF PERIOD OF DRIER AIR MOVING INTO THE REGION...SO THERE MAY

ACTUALLY BE SOME BREAKS IN THE CLOUDS...ESPECIALLY TOWARD THE

WESTERN CWA. MAX TEMPS WILL BE THE 20S.

SUNDAY NIGHT-FORECAST CONFIDENCE HIGH

POLAR RIDGE AXIS WILL EXTEND FROM WESTERN CANADA INTO THE GREAT

LAKES ASSOCIATED WITH CONFLUENCE ZONE BETWEEN POLAR VORTEX IN

EASTERN CANADA AND DIGGING TROUGH INTO NORTHERN ROCKIES. 850 MB

TEMPERATURES WILL BE ROUGHLY -13 TO -15C IN THE SHEBOYGAN

AREA...WITH EAST TO NORTHEAST FLOW. AN INVERTED LAKE TROUGH IS

SHOWN TO DEVELOP...AND JUST ABOUT EVERY MODEL DEVELOPS A DECENT

AMOUNT OF LAKE EFFECT LATE AT NIGHT AND MOVES IT ON SHORE. MUCH OF

THE GUIDANCE AND ESPECIALLY THE HIGHER RESOLUTION NAM INDICATES

POTENTIAL FOR A PRIMARY BAND ALONG A STRONGER CONVERGENCE ZONE.

THERE WAS CONSIDERATION FOR ISSUING A LAKE EFFECT SNOW WATCH FOR

THE SHEBOYGAN AND OZAUKEE AREA STARTING LATE SUNDAY NIGHT AND

RUNNING INTO MONDAY...GIVEN THREAT OF 6 TO 10 INCHES. NAM MODEL

SOUNDINGS AT KSBM ARE RATHER IMPRESSIVE WITH DELTA TS AROUND 18

AND EVEN UP TO 20 J/KG OF SBCAPE.

MONDAY-FORECAST CONFIDENCE HIGH

PROLONGED SNOW EVENT EXPECTED WITH NICE COUPLED JET CIRCULATION AT

250 MB AS 120 KNOT JET STREAM PULLS ACROSS NORTHERN LAKES INTO

ONTARIO AND ANOTHER 110 KNOT JET MOVES ACROSS KANSAS. SWATH OF

SNOW ALONG 522 DM THICKNESS SUGGESTS HIGH RATIOS ON THE ORDER OF

17:1 TO 20:1 AND MODEL CONSENSUS IS FOR 0.25 TO 0.40" OF LIQUID

OVER A 24 HOUR PERIOD. 4-8 INCHES OF SNOW OVER MORE THAN A 12 HOUR

PERIOD SUGGESTS THAT A HIGH END SNOW ADVISORY WILL BE NEEDED.

AGAIN...LOTS OF COORDINATION ACROSS THE MIDWEST DISCUSSING THE

POSSIBLE NEED FOR A WINTER STORM WATCH TO COVER THIS BEFORE THE

PRIMARY SYSTEM COMES OUT LATER. GIVEN THAT OUR CRITERIA IS 6

INCHES IN 12 HOURS OR 8 INCHES IN 24 HOURS...IT IS A CLOSE CALL.

THIS IS ALSO A 4TH OR 5TH PERIOD WATCH SO IT WAS DECIDED THAT AN

SPS AND HIGHLIGHTS VIA WEATHER BRIEFING/TOP NEWS ON THE WEB WOULD

BE A GOOD COMPROMISE.

COMPLICATING THIS IS THE LAKE ENHANCEMENT THAT COULD CERTAINLY ADD

A COUPLE MORE INCHES EVEN BEFORE TUESDAY. AGAIN...THIS MAY NEED TO

BE ADDRESSED ON THE MID SHIFT TONIGHT.

TUESDAY AND WEDNESDAY-FORECAST CONFIDENCE HIGH

STRONG UPPER LOW MOVING TOWARD NORTHERN CALIFORNIA COAST AT TIME

IS THE LOOMING BIG STORM FOR THIS PERIOD. ECMWF HAS BEEN VERY

CONSISTENT IN TAKING THIS STORM ON A FAVORABLE TRACK FROM EAST

TX/AR INTO THE OHIO RIVER VALLEY ACROSS CENTRAL OR SOUTHERN

INDIANA. GFS IS CONSISTENTLY SOUTH...WITH THE GFS

ENSEMBLES...CANADIAN...AND NAM IN THE MIDDLE. OFT-IGNORED DGEX IS

ALSO SIMILAR TO ECMWF.

AN INTERESTING TREND THAT CONTINUES ON ALL OF THE MODEL IS THE

NORTHWARD TREND OF THE 500 MB CONFLUENT ZONE...WHICH OFTEN MARKS

THE NORTHERN EDGE OF THE SNOW EVENT. IT CONTINUES TO PULL NORTH

WITH EACH RUN...SHOWING MORE AND MORE EFFECTS OF THE BACKING OFF

OF THE DEEP VORTEX OVER EASTERN CANADA AND THE INCREASED RIDGING

ALONG THE EAST COAST. EVEN THE SOUTHERN TRACK OF THE GFS BRINGS

HALF AN INCH OF LIQUID TO THE SOUTHEAST PART OF THE CWA...GOOD

ENOUGH FOR A LOW END WINTER STORM EVENT.

PROBLEM IS THAT THE CONSISTENT AND OFTEN SUPERIOR NORTHERN TRACK

OF THE ECMWF PROVIDES STORM TOTAL LIQUIDS ON THE ORDER OF 2" OVER

NORTHEAST IL AND 1.5" IN KENOSHA AREA. EVEN NOT COUNTING THE FIRST

SNOW EVENT MONDAY...1.2" IN KENOSHA WITH A 15:1 RATIO IS 18 INCHES

OF SNOW. GIVEN 850 MB TEMPS OF -13 TO -16C AND A LAKE TEMPERATURE

AROUND 3C...WE ARE TALKING ABOUT VERY UNSTABLE CONDITIONS AND

SIGNIFICANT LAKE ENHANCEMENT FOR THIS STORM. PUT ON TOP OF THIS

THE POTENTIAL FOR GALE FORCE NORTHEAST WINDS OFF THE LAKE AND

TEMPERATURES IN THE TEENS AND LOWER 20S...THIS COULD BE A

SIGNIFICANT SNOW STORM OR BLIZZARD FOR THE LAKE SHORE. IMPACTS

WOULD BE ENHANCED BY THE WIND...COLD TEMPERATURES AND INEFFECTIVE

SALT...AND THE LONG DURATION OF THE SNOW EVENT DURING THE WORK

WEEK. SNOW REMOVAL EFFORTS MAY BE ONGOING NEARLY CONTINUOUSLY FOR

ABOUT 48 HOURS.

A CONSENSUS OF MODEL QPF AND RATHER CONSERVATIVE SNOW TO LIQUID

RATIOS IN THE 15:1 TO 18:1 RANGE YIELD STORM TOTALS IN KENOSHA

AREA ON THE ORDER OF 2 FEET BETWEEN MONDAY AND WEDNESDAY. STAY

TUNED.

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