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Feb. 13-15TH Potential Winter Storm


PatrickSumner

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I know, I know, it is very early in the ball game, but the GFS and EURO both show a storm. The EURO seems to be slightly faster which is surprising because it likes to hold energy back in the southwest.  It has been trending west the past couple of runs now thus this thread. The 12Z GFS run is below (Hours 186 and 189 respectively)

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I'm gonna guess this is an East Coast'er and maybe a Mid Atlantic system. The cold which may be diving into the middle of the nation will likely cause a system to spin up well East of the lakes. I think this may very well be the big storm of the Winter out East. As far as the Midwest-Lakes-Ohio Valley goes, I think we may be in the game for something around the 17th-22nd. I think the pattern could favor a snow storm or a healthy icing event.

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GFS with a better pv "look" tonight, but the s/w is so far south, the arctic jet would have to dig just about into the gulf to find it lol.

Yes...the threat for this time frame is still alive and well. May have to change the date to the 10-11TH instead of all the way through the 13TH. Will not play around with it right now.

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I'm gonna guess this is an East Coast'er and maybe a Mid Atlantic system. The cold which may be diving into the middle of the nation will likely cause a system to spin up well East of the lakes. I think this may very well be the big storm of the Winter out East. As far as the Midwest-Lakes-Ohio Valley goes, I think we may be in the game for something around the 17th-22nd. I think the pattern could favor a snow storm or a healthy icing event.

The GFS and the GGEM do show something around the 15th-16th for the region.

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Only thing special happening in this thread is a Blue light special at k-mart. Pretty soon this will be pushed back to the deedler storm thread.

18Z GFS makes this a Great Lakes event. Not a massive amount of moisture, but would throw down a easy 2-4 along and north of I80 with more possible with lake enhancement. Things could still change either way going forward.

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This morning's ILX forecast discussion--possibly an WWA in store for my area for tomorrow?

000

FXUS63 KILX 121138

AFDILX

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE LINCOLN IL

538 AM CST SUN FEB 12 2012

.DISCUSSION...

ISSUED 318 AM CST SUN FEB 12 2012

AMPLIFIED FLOW OVER THE ERN HALF OF THE CONUS THIS

MORNING...PUSHING MUCH COLD ARCTIC AIR INTO THE MIDWEST WITH MORE

NORTHERLY FLOW. HIGH PRESSURE RIDGE AT THE SFC TAKING UP THE

MIDDLE OF THE COUNTRY STRETCHING OVER THE PLAINS. ANOTHER UPPER

LOW DIGGING IN OVER THE SWRN CONUS...AS A SFC LOW SLOWLY DEVELOPS.

ISSUES WITH THE FORECAST ARE THE NEXT COUPLE OF SHOTS AT PRECIP

AS WAVES ROLL OUT OF THE SWRN US. FIRST EVENT STARTS OFF THE WEEK

WITH MEASURABLE SNOW FRI AFTERNOON AND IN THE OVERNIGHT. SOME

MINOR ISSUES WITH TIMING...MOSTLY AFFECTING WHEN THE HEAVIER SNOW

WILL ACTUALLY GET GOING ON MONDAY AFTERNOON. NEXT HINT OF PRECIP

IN THE FORECAST IS MID WEEK. BOTH GFS AND ECMWF ARE IN AGREEMENT

OVER THE HANDLING OF THE SYSTEM WED NIGHT/THU...WITH THE LAST BITS

OF THE NAM COMING TO THE SAME SOLN. MORE OF A DISCONNECT ON THE

NEXT WAVE OUT OF THE SW LATER IN THE WEEK.

SHORT TERM...TODAY AND TOMORROW...

AS THE SFC RIDGE SLOWLY DRIFTS EASTWARD...AND THE NORTHERLY WINDS

ALOFT SHIFT AS WELL...THE SFC WINDS BECOME MORE

WESTERLY...ALLOWING A BIT OF A WARM UP OVER YESTERDAYS HIGHS IN

THE 20S...THOUGH STAYING MOSTLY BELOW FREEZING. CLOUDS MOVING IN

TONIGHT IN ADVANCE OF THE NEXT WAVE MOVING THROUGH AND BRINGING

SNOW FOR MONDAY. GFS WAS A BIT FASTER THAN THE NAM...THOUGH THE

LAST SYNOPTIC RUNS HAD A LITTLE LESS OF A DIFFERENCE. THE 06Z NAM

AND THE 00Z GFS HOLD OFF ON THE HIGHER ACCUMULATIONS UNTIL AFTER

18Z IN THE WEST...KEEPING THE SNOW GOING THROUGH THE

OVERNIGHT...WITH AMOUNTS MOSTLY IN THE ONE TO TWO INCH RANGE.

HOWEVER...THE SW HAS A CHANCE TO SEE AN EARLIER ONSET OF SNOW WITH

A HIGHER SLR...AND CLOSER TO THE STRONGER DYNAMICS IN PROXIMITY TO

THE WAVE...AND HAS MORE OF A 2 TO 3 RANGE. HPC QPF WAS BUMPED UP A

BIT WITH THE 06Z ISSUANCE...PUTTING ILX SWRN COUNTIES CLOSE TO

ADVISORY CRITERIA. WITH THE DISCONNECT BETWEEN START TIME AND

POTENTIAL ACCUMULATION MISS BEFORE 18Z...HAVE PULLED BACK SOMEWHAT

OVERALL...WILL DEFER TO NEXT SYNOPTIC RUN FOR ANY MAJOR DECISIONS.

WILL BE BORDERLINE SITUATION EITHER WAY. SNOW SHOULD BEGIN ITS

RETREAT TUES MORNING. BUFKIT SOUNDINGS HINTING AT THE POTENTIAL

FOR FZDL BEHIND THE SYSTEM...BUT WAVE OVERALL IN A BIT OF A HURRY

IN A MORE PROGRESSIVE WESTERLY PATTERN. HESITATE TO CALL A LOT OF

ATTENTION TO THE BACK SIDE OF A RAPIDLY PROGRESSING SYSTEM WITH

TIMING ISSUES.

LONG TERM...TUESDAY THROUGH SATURDAY...

ANOTHER SYSTEM PUSHES OUT OF THE SWRN US ON WED...AND ALL MODELS

AGREEING MORE THAN USUAL. HOWEVER...STICKING POINT WITH THIS

SYSTEM REVOLVES AROUND THE FACT THAT IN THE WAKE OF THE EARLY WEEK

SYSTEM...THE ATMOSPHERE HAS BEEN SEVERELY MODIFIED AND THE

SOUNDINGS ARE NOT SO UNIFORMLY IN THE FAVOR OF SNOW. SOUTHERN HALF

OF ILLINOIS SLATED FOR RAIN...WITH A MESSY MIX FOR THE NORTH.

LITTLE ACCUMULATION IS ANTICIPATED AS A RESULT. NEXT SYSTEM HAS

MASSIVE TIMING DISAGREEMENT BETWEEN THE ECMWF (SAT) AND THE GFS

(SAT NIGHT/SUN) AND THE HANDLING OF THE EXIT OF THE WAVE OUT OF

THE WEST IN THE FIRST PLACE. ECMWF PUSHES A SLIGHT WAVE AND

STRINGS OUT THE REST...WHILE THE GFS DEEPENS OVER THE COAST BEFORE

PUSHING A MORE MATURE SYSTEM. AS A RESULT...PRECIP IS NOT

MENTIONED IN THE FORECAST BEYOND MIDWEEK UNTIL THE PIC BECOMES

CLEARER. SAFE TO SAY THE FLOW LOOKS TO REMAIN MORE ACTIVE THROUGH

THE END OF THE WEEK.

HJS

&&

.AVIATION...

ISSUED 538 AM CST SUN FEB 12 2012

QUIET AVIATION WEATHER IS EXPECTED ACROSS THE CENTRAL ILLINOIS

TERMINALS THROUGH THE 12Z TAF VALID TIME. A RIDGE OF HIGH PRESSURE

WILL BUILD ACROSS THE REGION...ACCOMPANIED BY A DRY AIRMASS. WEST

NORTHWEST WINDS WILL TREND VARIABLE TONIGHT AS THE HIGH PRESSURE

RIDGE CROSSES THE AREA. MINIMAL CLOUD COVER IS ANTICIPATED...

THOUGH AN INCREASE IN MID/HIGH LEVEL CLOUDINESS IS ANTICIPATED

TONIGHT WITH THE APPROACH OF A STORM SYSTEM. THIS SYSTEM...

EXPECTED TO BE A SNOW PRODUCER LOCALLY...WILL NOT SIGNIFICANTLY

IMPACT THE TERMINALS UNTIL AFTER THE 12Z TAF VALID TIME.

BAK

&&

.ILX WATCHES/WARNINGS/ADVISORIES...

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:D

12z NAM, as per usual, is the "wettest" of the guidance bringing 0.25" QPF amounts through central IL on east through central OH. I'll disregard that, and make a first call of 1-2" for LAF.

I think we could squeeze out a couple inches here. I'm normally not a fan of long duration light events at this time of year due to the increasing sun angle but it looks like the vast majority of this event will come after dark.

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I think we could squeeze out a couple inches here. I'm normally not a fan of long duration light events at this time of year due to the increasing sun angle but it looks like the vast majority of this event will come after dark.

Yeah I can get on board with this line of thinking. Rates look pretty light, so the bulk falling during nighttime will be a bonus.

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:D

12z NAM, as per usual, is the "wettest" of the guidance bringing 0.25" QPF amounts through central IL on east through central OH. I'll disregard that, and make a first call of 1-2" for LAF.

Even with that ratios will be terrible with wet snow, 0.25 would probaly yield less than 2 inches.

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As light as this snow probably will be, this looks to be one of the most widespread snow events anywhere in the country this season. A very large area should see some light snow accumulation. Im thinking a good inch here, but holding my breath for possibly 2". It looks like a vast majority of the precip falls tomorrow night (0.07-0.10") with temps in the 20s, so no problem there...then a few hundredths of probable wasted qpf in the form of wet snow during the day Tues as it warms to maybe the mid-30s. Either way a nice refresher snow looking likely.

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