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January Pattern and Storm Discussion II


Cold Rain

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Well you gotta love that we have this possible solution on the table only 4/5 days out instead of 7/8.  Will be fun to watch this week.

New NAM is out and it is not on-board at all. Shows the ULL much stronger and farther north. Also shows the SE ridge much stronger than the GFS....but it's the NAM at 84 hours so take it for what it is worth......(not much).

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RAH is still in a watch mode in this afternoon's long range discussion:

 

.LONG TERM /THURSDAY THROUGH SUNDAY/...
AS OF 325 PM SUNDAY...

THE SOUTHERN PORTION OF THE POSITIVELY-TILTED TROUGH ALOFT IN THE
MEAN...IN THE FORM OF A S/W TROUGH AMPLIFYING THROUGH NEVADA THIS
AFTERNOON...WILL SHEAR EASTWARD IN STRONG CYCLONIC FLOW AT THE BASE
OF A DEVELOPING NEGATIVE HEIGHT ANOMALY INVOF HUDSON BAY/SE CANADA.
THOUGH FORECAST CONFIDENCE OF TIMING AND AMPLITUDE OF THIS S/W IS
ONLY AVERAGE...CONFIDENCE IS HIGH THAT THE ASSOCIATED SURFACE
REFLECTION WILL BE SUPPRESSED OUT TO SEA AND NOT GAIN LATITUDE UP
THE EAST COAST...GIVEN THE PRESENCE OF THE AFOREMENTIONED SE CANADA
VORTEX. WHILE SUCH A SCENARIO WILL FREE MUCH OF THE MIDDLE ATLANTIC
AND NORTHEAST OF ANY COASTAL STORM THREAT...IT WILL SPREAD A SWATH
OF PRECIPITATION ACROSS THE GULF COAST AND SOUTHEAST STATES --
INCLUDING THE CAROLINAS -- THU-FRI...THE NORTHERN PERIPHERY OF WHICH
WOULD BE IN THE FORM OF WINTRY PRECIPITATION
. CURRENT 20-30 POP
ACROSS THE NC SOUTHERN TIER THU NIGHT AND FRI WILL NEED UPWARD
ADJUSTMENTS AS DETAILS BECOME CLEARER.

ANOTHER ARCTIC FRONT WILL MAKE A RUN INTO THE MIDDLE ATLANTIC...BUT
SHY OF NC LATE IN THE WEEKEND. TO GET THIS ARCTIC AIR TO OUR
LATITUDE...HOWEVER...IT WILL TAKE UPSTREAM FLOW AMPLIFICATION THAT
THE MEDIUM RANGE GUIDANCE HAS INSISTED WILL OCCUR WITH THE
DEVELOPMENT OF STRONG WESTERN NOAM RIDGING (POSITIVE PNA) EARLY-MID
WEEK.

 

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New NAM is out and it is not on-board at all. Shows the ULL much stronger and farther north. Also shows the SE ridge much stronger than the GFS....but it's the NAM at 84 hours so take it for what it is worth......(not much).

 

It doesn't matter because it's the 84 NAM but at 84 hours and 84 hours on the Euro it actually lines up pretty well just from my amateur eyes

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GSP acknowledges potential...

 

 

THE REAL PROBLEM COMES TO LIGHT THURSDAY NIGHT AND INTO FRIDAY ASTHE LONG WAVE UPPER TROF DEEPENS OVER EASTERN NORTH AMERICA. BOTHTHE GFS AND ECMWF HAVE SOME MEASURE OF A SOUTHERN STREAM ORPHANUPPER SYSTEM OVER THE SRN PLAINS ON THURSDAY...WHICH DAMPENS AS ITIS BEING REABSORBED INTO THE MEAN UPPER TROF BY FRIDAY. AS THESYSTEM COMES ACROSS THE SOUTHEAST...FAVORABLE MID/UPPER SUPPORT ANDMOISTURE WOULD FORCE PRECIP DEVELOPMENT IN AN ENVIRONMENT THAT HASFAVORABLE THICKNESS AND PROFILES ACROSS THE WRN CAROLINAS AND NEGEORGIA SUCH THAT ANY PRECIP WOULD BE SOMETHING OTHER THAN RAIN. THEGFS APPEARED TO BE SOMEWHAT OF AN OUTLIER UNTIL THE 12Z RUN OF THEECMWF CAME ON BOARD WITH THE SAME GENERAL IDEA. BECAUSE THIS IS ARELATIVELY NEW DEVELOPMENT AND THERE IS CONSIDERABLE UNCERTAINTYWITH STRENGTH AND TIMING OF A WEAKENING SYSTEM...THINK IT BEST FORNOW TO NOT INTRODUCE ANY CHANCE OF A WINTER WEATHER EVENT FOR THISCYCLE. IF THE MODELS REMAIN CONSISTENT...THEN WE CAN HOP ON BOARDWITH THE NEXT CYCLE.
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It doesn't matter because it's the 84 NAM but at 84 hours and 84 hours on the Euro it actually lines up pretty well just from my amateur eyes

Hmmm. I was just extrapolating the NAM, and I could not imagine that we could have a snowstorm with the 582dm height up that far north in advance of the storm. It must really crash in the next few frames.

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I don't blame GSP for being conservative, they don't want to get burned... again

RAH is doing the same thing. I don't blame; as long as they state the chance in the discussions it covers them in case it does happen, The official release forecast will not mention wintery precip. That's fine for the 99% of the people looking at next weeks forecast. The 1% (us weenies & weather sensitive organizations) are being satisified with the mention of the possibilities. I have a hard time at work telling people that there is chance of snow when the offical NWS forecast has rain at 40 degrees.  

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New NAM is out and it is not on-board at all. Shows the ULL much stronger and farther north. Also shows the SE ridge much stronger than the GFS....but it's the NAM at 84 hours so take it for what it is worth......(not much).

 

The NAM has showed a much stronger ULL for several runs now. If the NAM went past hour 84 it looks like the ULL would hold together alot better on its trek eastward.

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No Wilkes, Cold Rain needs to do the hononrs......How many more runs before we start a dedicated storm thread? :P

 

Me personally...I would wait another 24 hours before starting a thread specific to the Thurs/Friday threat. Start it Tuesday morning after the 0z suite. For now keep the conversation in here.

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No Wilkes, Cold Rain needs to do the honors......How many more runs before we start a dedicated storm thread? :P

 

 

you are $&%! right about that!

 

hence, why I chose the board name I did

 

also, 18z goof is more stout with our 500mb system @ 72-84 compared to the 12z was at the same times

 

I have a feeling this upper low ends up tracking slightly farther north and NC scores Thursday night... hopefully the ULL can produce some -2 to -3Cs within the cold core at 5,000ft... we would also sustain some heavier rates with more lift if this thing can stay stronger longer / somewhat bundled at 500mb longer

 

it is going to take heavy, consistent precip rates to overcome low-level warmth and soil temps

 

edit:  now that I've seen the news frames - stronger surface system draws a bit warmer air at 925mb and even 850mb... this is so marginal it will go back and forth on each model run I bet

 

catch 22 again... we either want this to stay weak and go right over our heads or trend stronger and further south, but I doubt the upper energy can go much further south can happen based on the flow upstream

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URGENT - WINTER WEATHER MESSAGENATIONAL WEATHER SERVICE JACKSON MS316 PM CST SUN JAN 13 2013ARZ074-075-LAZ007>009-015-MSZ018-019-025>027-034>036-040>042-140530-/O.NEW.KJAN.WS.A.0001.130114T1200Z-130115T0600Z/ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND-BOLIVAR-SUNFLOWER-LEFLORE-GRENADA-CARROLL-WASHINGTON-HUMPHREYS-HOLMES-ISSAQUENA-SHARKEY-YAZOO-INCLUDING THE CITIES OF...CROSSETT...NORTH CROSSETT...HAMBURG...WEST CROSSETT...DERMOTT...LAKE VILLAGE...EUDORA...BASTROP...OAK GROVE...EPPS...LAKE PROVIDENCE...RAYVILLE...DELHI...CLEVELAND...INDIANOLA...RULEVILLE...GREENWOOD...GRENADA...VAIDEN...NORTH CARROLLTON...CARROLLTON...GREENVILLE...BELZONI...ISOLA...DURANT...TCHULA...LEXINGTON...PICKENS...GOODMAN...MAYERSVILLE...ROLLING FORK...ANGUILLA...YAZOO CITY316 PM CST SUN JAN 13 2013...WINTER STORM WATCH IN EFFECT FROM MONDAY MORNING THROUGHMONDAY EVENING...THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A WINTER STORMWATCH...WHICH IS IN EFFECT FROM MONDAY MORNING THROUGH MONDAYEVENING.* TIMING: FREEZING RAIN LOOKS TO START AROUND MID MORNING MONDAY AND  PERSIST INTO THE EVENING.* MAIN IMPACT: ICE ACCUMULATION OF O.25 TO 0.5 INCH IS EXPECTED WITH  SOME HIGHER ACCUMULATIONS UP TO 0.75 INCH POSSIBLE.* OTHER IMPACTS: SUCH ICING WILL CAUSE VERY DANGEROUS TRAVEL  CONDITIONS AS ELEVATED SURFACES WILL ICE OVER ALONG WITH SOME ICING  ON ROADS. ADDITIONALLY...ACCUMULATING ICE ON TREES AND POWER LINES  WILL CAUSE THEM TO FAIL...RESULTING IN DOWNED LINES AND POWER  OUTAGES.

 

Can;'t believe everyone here leaves Miss out and just talks about IMBY.Unreal for a SE board

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18z has the sustained cold coming in around 192 for those North of I-20 and it stays through 288, there's an actual clipper system that slides down by 288...could put down some rare "clipper snows" in KY, VA, TN maybe parts of NC.

 

It finally moderates @ 312...however truth be known if this does indeed drop down, I'm willing to bet there will be additional pieces dropping out of Canada that's not being picked up in the fantasy range.

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URGENT - WINTER WEATHER MESSAGENATIONAL WEATHER SERVICE JACKSON MS316 PM CST SUN JAN 13 2013ARZ074-075-LAZ007>009-015-MSZ018-019-025>027-034>036-040>042-140530-/O.NEW.KJAN.WS.A.0001.130114T1200Z-130115T0600Z/ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND-BOLIVAR-SUNFLOWER-LEFLORE-GRENADA-CARROLL-WASHINGTON-HUMPHREYS-HOLMES-ISSAQUENA-SHARKEY-YAZOO-INCLUDING THE CITIES OF...CROSSETT...NORTH CROSSETT...HAMBURG...WEST CROSSETT...DERMOTT...LAKE VILLAGE...EUDORA...BASTROP...OAK GROVE...EPPS...LAKE PROVIDENCE...RAYVILLE...DELHI...CLEVELAND...INDIANOLA...RULEVILLE...GREENWOOD...GRENADA...VAIDEN...NORTH CARROLLTON...CARROLLTON...GREENVILLE...BELZONI...ISOLA...DURANT...TCHULA...LEXINGTON...PICKENS...GOODMAN...MAYERSVILLE...ROLLING FORK...ANGUILLA...YAZOO CITY316 PM CST SUN JAN 13 2013...WINTER STORM WATCH IN EFFECT FROM MONDAY MORNING THROUGHMONDAY EVENING...THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A WINTER STORMWATCH...WHICH IS IN EFFECT FROM MONDAY MORNING THROUGH MONDAYEVENING.* TIMING: FREEZING RAIN LOOKS TO START AROUND MID MORNING MONDAY AND  PERSIST INTO THE EVENING.* MAIN IMPACT: ICE ACCUMULATION OF O.25 TO 0.5 INCH IS EXPECTED WITH  SOME HIGHER ACCUMULATIONS UP TO 0.75 INCH POSSIBLE.* OTHER IMPACTS: SUCH ICING WILL CAUSE VERY DANGEROUS TRAVEL  CONDITIONS AS ELEVATED SURFACES WILL ICE OVER ALONG WITH SOME ICING  ON ROADS. ADDITIONALLY...ACCUMULATING ICE ON TREES AND POWER LINES  WILL CAUSE THEM TO FAIL...RESULTING IN DOWNED LINES AND POWER  OUTAGES.

 

Can;'t believe everyone here leaves Miss out and just talks about IMBY.Unreal for a SE board

Its nothing sinister.  There's just a lack of MS posters.

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