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Winter 2013-14 Pattern Discussion III


Marion_NC_WX

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how about the mtns. from the system on the 17-18 next week?  

Because of the track of the low off the coast of wilmy and going NE, not cutting up the coast, the moisture in the mountains is limited.

 

I haven't really been following things since I am more ready for spring now than seeing more snow. Is this for the St Patrick's Day system? Is the Euro the only one showing snow here now?

 Yes St. Patricks Day system, but the models differ in timing so calling it that is kinda premature. It could be a 3/18 or even a 3/19 system. New 00z CMC has a sub 998mb low off the coast of HAT, so I guess you could say it's the only model showing 850's cold enough for snow but most models have the system. Like I said a few posts earlier, screams of a cold chasing moisture setup but some members/runs are showing snow or mix.

 

not to many folks talking much Brick.  I don't know if the 17th storm is still showing or not.  Just looked at Roberts facebook and he doesn't sound to bullish on any freezing precip for anyone in NC.  :snowing:

It is.

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You talking about between 144 and 168? That's the only thing I can see on eWall that looks close. Everything else looks like garbage.

 

 

 Yes exactly that. Verbatim it's a far northern/NE county VA/NC border event. 850's suck, which climo speaking doesn't surprise, but it's cold enough RDU north.

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Latest from RAH

 

CONFIDENCE DECREASES EVEN FURTHER FOR VERY END OF THE WEEKEND AND
INTO EARLY NEXT WEEK...BUT THE GENERAL CONSENSUS IS THAT A NORTHERN
STREAM TROUGH WILL DIG INTO THE SOUTHEAST...WITH YET ANOTHER COASTAL
LOW IMPACTING THE REGION AS SOUTHERN STREAM ENERGY MOVES EAST.
HOWEVER...THERE IS LARGE MODEL SPREAD...WITH THE GFS DIGGING THE
NORTHERN STREAM LOW INTO THE CENTRAL/SOUTHERN GULF...SUPPRESSING THE
STORM TO THE SOUTH AND EAST OF CENTRAL NC AS THE RESULTANT SURFACE
LOW TRACKS WELL OFFSHORE. THE ECMWF IS NOT AS SUPPRESSED AND THE
RESULTANT SURFACE LOW TRACKS CLOSER TO THE COAST...THUS SPREADING
PRECIP INTO THE REGION. FOR NOW WILL SHOW INCREASING PRECIP CHANCES
LATE SUNDAY INTO MONDAY...WITH NEAR NORMAL TEMPS.

 

and long term from yesterday from Blacksburg, VA which I think has a good "what if" disco...

 

.LONG TERM /SATURDAY THROUGH MONDAY/...
AS OF 300 PM EDT MONDAY...

NEXT SYSTEM COMING THROUGH THE NORTHERN STREAM STAYS NORTH OF THE
FORECAST AREA. SURFACE LOW WITH THIS SYSTEM WILL PUSH A COLD FRONT
THROUGH THE REGION ON SATURDAY. ANY THREAT OF PRECIPITATION WILL BE
CONFINED TO THE NORTHWEST COUNTY WARNING AREA.

LONG RANGE MODELS BECOME SIGNIFICANTLY DIFFERENT WITH THE UPPER
PATTERN ON SUNDAY AND MONDAY. WILL BE LEANING TOWARD THE SPLIT
FLOW OF THE ECMWF WHICH HOLDS AN UPPER TROF OVER THE GREAT LAKES
AND CLOSES OFF AN UPPER LOW OVER THE SOUTHERN PLAINS ON MONDAY.

BY DAY 7...MONDAY...THE ECMWF IS STARTING TO SUGGEST THE
POTENTIAL FOR A SURFACE LOW OFF THE CAROLINA COAST. IF THE LARGE
HIGH THAT THE MODEL HAS OVER THE GREAT LAKES IS ABLE TO WEDGE DOWN
THE EAST SIDE OF THE APPALACHIANS...THERE MAY BE A POTENTIAL FOR
WINTER PRECIPITATION MONDAY NIGHT.

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Newest WPC images

 

aHy12L9.gif

 

 

o5Bv7hx.gif

 

Latest from RAH

 

CONFIDENCE DECREASES EVEN FURTHER FOR VERY END OF THE WEEKEND AND

INTO EARLY NEXT WEEK...BUT THE GENERAL CONSENSUS IS THAT A NORTHERN

STREAM TROUGH WILL DIG INTO THE SOUTHEAST...WITH YET ANOTHER COASTAL

LOW IMPACTING THE REGION AS SOUTHERN STREAM ENERGY MOVES EAST.

HOWEVER...THERE IS LARGE MODEL SPREAD...WITH THE GFS DIGGING THE

NORTHERN STREAM LOW INTO THE CENTRAL/SOUTHERN GULF...SUPPRESSING THE

STORM TO THE SOUTH AND EAST OF CENTRAL NC AS THE RESULTANT SURFACE

LOW TRACKS WELL OFFSHORE. THE ECMWF IS NOT AS SUPPRESSED AND THE

RESULTANT SURFACE LOW TRACKS CLOSER TO THE COAST...THUS SPREADING

PRECIP INTO THE REGION. FOR NOW WILL SHOW INCREASING PRECIP CHANCES

LATE SUNDAY INTO MONDAY...WITH NEAR NORMAL TEMPS.

 

and long term from yesterday from Blacksburg, VA which I think has a good "what if" disco...

 

.LONG TERM /SATURDAY THROUGH MONDAY/...

AS OF 300 PM EDT MONDAY...

NEXT SYSTEM COMING THROUGH THE NORTHERN STREAM STAYS NORTH OF THE

FORECAST AREA. SURFACE LOW WITH THIS SYSTEM WILL PUSH A COLD FRONT

THROUGH THE REGION ON SATURDAY. ANY THREAT OF PRECIPITATION WILL BE

CONFINED TO THE NORTHWEST COUNTY WARNING AREA.

LONG RANGE MODELS BECOME SIGNIFICANTLY DIFFERENT WITH THE UPPER

PATTERN ON SUNDAY AND MONDAY. WILL BE LEANING TOWARD THE SPLIT

FLOW OF THE ECMWF WHICH HOLDS AN UPPER TROF OVER THE GREAT LAKES

AND CLOSES OFF AN UPPER LOW OVER THE SOUTHERN PLAINS ON MONDAY.

BY DAY 7...MONDAY...THE ECMWF IS STARTING TO SUGGEST THE

POTENTIAL FOR A SURFACE LOW OFF THE CAROLINA COAST. IF THE LARGE

HIGH THAT THE MODEL HAS OVER THE GREAT LAKES IS ABLE TO WEDGE DOWN

THE EAST SIDE OF THE APPALACHIANS...THERE MAY BE A POTENTIAL FOR

WINTER PRECIPITATION MONDAY NIGHT.

Thanks Jon, looks like still a good chance for some in nc according to these maps.  hope the cold high can wedge down into the apps.  some may get snow for monday night. looks like a great track if it holds.

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Jon - WPC has moved the low farther south (just updated)...this matches the move south on the Euro Ensemble.  It's a good looking setup, but temps will be questionable as usual.

 

Nice, thanks.

 

Updated Disco to go with:

EXTENDED FORECAST DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

1159 AM EDT TUE MAR 11 2014

 

ALONG THE EAST COAST...MODELS GENERALLY ALLOW ENOUGH

EAST-SOUTHEASTWARD PUSH OF THE NORTHERN STREAM OUT OF SOUTHEAST

CANADA TO DRIVE A LAYER OF COLDER AIR THROUGH THE SOUTHEAST...THEN

ATTEMPT TO PRODUCE SOME ILL-DEFINED WAVINESS ALONG THIS MODIFIED

BOUNDARY. CYCLOGENESIS LOOKS TO BE ACCOMPLISHED INVOF THE GULF

STREAM AND JUST EAST OF THE CAROLINAS THIS PERIOD.

 

EARLY NEXT

WEEK... THREAT WILL REMAIN FOR THE POSSIBLE COASTAL SYSTEM MOVING

OUT OF THE SOUTHEAST. POTENTIAL EXISTS FOR A WIDESPREAD MODEST TO

LOCALLY HEAVY RAINFALL EVENT WITH AMPLE GULF MOISTURE SPREADING

NORTHWARD AND EASTWARD. TRANSITION TO SNOW IS LIKELY ON THE NORTH

SIDE OF THE PRECIP SHIELD BUT THAT IS DEPENDENT ON DETAILS WHICH

ARE FAR FROM KNOWN. FROPA SHOULD BRING ANOTHER ROUND OF COOLER AIR

TO THE SOUTHEAST AND FLORIDA BY TUE/D7 EAST OF THE SFC HIGH.

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That high on those maps looks stout! Pretty nice set up at about 7 days out, maybe it can trend colder and let some people outside of NC get some snow. I don't think this would be an ice set up, it looks like rain or snow. I'll take my chances with 35 and snow, instead of 30 and some freezing rain/ sleet, despite what happened about a week ago!

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Count me as unimpressed regarding GA's chances at sig. wintry precip. at this stage. We could hope for better CAD, but as of now, this doesn't look nearly as impressive as the last storm. The high is not even close to the 1041 mb that existed for the last storm, which had textbook CAD and the most impressive combo of CAD and gulf low in early March I could find for perhaps the last 45+ years. Also, I don't see a Gulf low on model consensus. So, I can't get overly excited about this one unless model consensus changes pretty substantially. At this stage, this looks like a N NC special perhaps, if anything.

 

 Regardless, it is exciting for this subforum to still be discussing wintry possibilities for someone even outside of the mountains.

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Grit.

 

Does the ensembles show a two part system like the operational?

 

I know the op goes from MS/LA to Sav off of Wilmington. Too warm all liquid the first part then a secondary s/w comes through Sunday night/ Monday morning with crashing temps and possible snow along the VA border into VA. I see the northern mountains could benefit from this s/w as well.

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12z Euro ensembles KRDU: 27/50 members have "snow" mean near 1.7"

 

OP is running pretty hot compared to ensembles at 2m temp, FWIW.

The system is faster on the newest ensembles compared to 00z Ensembles, too...
By 12z 1/17....00z low mean was in northern FL, 12z low mean is over Wilmington.

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Grit.

 

Does the ensembles show a two part system like the operational?

 

I know the op goes from MS/LA to Sav off of Wilmington. Too warm all liquid the first part then a secondary s/w comes through Sunday night/ Monday morning with crashing temps and possible snow along the VA border into VA. I see the northern mountains could benefit from this s/w as well.

 

nc - it looks like one storm coming out for Sun night / Mon

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Outside the mountains..not sure what everyone is trying to track.  Even the 00z Euro looks pretty fail to me.  It shows trace-dusting amounts into a lot of NC (with a bit more on the North part).. but as a whole... Winter precipitation is over imo.

 

Can't say I'll miss the cold either.

 

I've read some stupid articles around the net trying to mention the super storm from 93'.  Those people are insane.

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Outside the mountains..not sure what everyone is trying to track.  Even the 00z Euro looks pretty fail to me.  It shows trace-dusting amounts into a lot of NC (with a bit more on the North part).. but as a whole... Winter precipitation is over imo.

 

Can't say I'll miss the cold either.

 

I've read some stupid articles around the net trying to mention the super storm from 93'.  Those people are insane

 

Tell that to Austin Caviness who just showed, on our news, the European model dropping 1.5 inches imby.

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Not a lot of chatter on this, but GFS and Euro both showing 1 to 2 inches of snow for a lot of NC now.

Here you go....you must have missed it:

Outside the mountains..not sure what everyone is trying to track. Even the 00z Euro looks pretty fail to me. It shows trace-dusting amounts into a lot of NC (with a bit more on the North part).. but as a whole... Winter precipitation is over imo.

Can't say I'll miss the cold either.

I've read some stupid articles around the net trying to mention the super storm from 93'. Those people are insane.

 

Tell that to Austin Caviness who just showed, on our news, the European model dropping 1.5 inches imby.

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00z Euro ensembles are down for most places, RDU included, lost most big dog solutions and the individual members with snow has also lowered. 23/50 have snow, highest member is 8", most members are in the T-2" range with a mean of 1"

 

GSO: 2"

CLT: 0.5"

HKY: ~1"

AVL: 1.2"

GSP: too low to see

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Outside the mountains..not sure what everyone is trying to track.  Even the 00z Euro looks pretty fail to me.  It shows trace-dusting amounts into a lot of NC (with a bit more on the North part).. but as a whole... Winter precipitation is over imo.

 

Can't say I'll miss the cold either.

 

I've read some stupid articles around the net trying to mention the super storm from 93'.  Those people are insane.

 

I'm not a big fan of definitive statements like this with regards to the weather.  We have a hard enough time predicting the high temperatures for tomorrow, much less predicting what might happen next week.  When tax day gets here, I might endorse your statement, but before then the weather is much too variable for me to claim to know what it is going to do next.

 

This next part is not solely directed at you, Shawn, but at members in general:  Why do people feel the need to pronounce a death to winter?  Is it somehow cathartic?  The weather does not care whether you or I think winter is over or not.  Whatever will happen will happen, and our opinions on the matter are generally worthless.  Sit back, enjoy the ride, whether it happens to be cold and wintry or warm and spring-like.  They are both awesome scenarios, and I will choose to bask in the glory of whichever hand I happen to be dealt, but I won't claim to know which is going to definitively happen from here on out.

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I'm not a big fan of definitive statements like this with regards to the weather.  We have a hard enough time predicting the high temperatures for tomorrow, much less predicting what might happen next week.  When tax day gets here, I might endorse your statement, but before then the weather is much too variable for me to claim to know what it is going to do next.

 

This next part is not solely directed at you, Shawn, but at members in general:  Why do people feel the need to pronounce a death to winter?  Is it somehow cathartic?  The weather does not care whether you or I think winter is over or not.  Whatever will happen will happen, and our opinions on the matter are generally worthless.  Sit back, enjoy the ride, whether it happens to be cold and wintry or warm and spring-like.  They are both awesome scenarios, and I will choose to bask in the glory of whichever hand I happen to be dealt, but I won't claim to know which is going to definitively happen from here on out.

Good post, Calc.

And according to DT, A snowstorm doesn't happen because the GFS shows one.

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I guess ultimately your location and prespective of this plays a huge role and probably with out a doubt winter weather is over south of the GA mountains and well south of the NC/SC line.

 

 

But timing of this is not going to allow this to become a major storm. If the pieces would come together early enough this could be a significant event for much of NC almost border line major on the Euro. There is a potent southern stream s/w that will bring the rain a cold rain at that for most of NC. But the northern stream is lagging behind with no interaction prior to the arrival of s/w in the southern stream which by then is over VA/NC/GA/SC. Pretty much any phasing to occur is last min too late.

 

But on the 0Z operational euro there maybe slight improvements from its 12z counter part. Wetter overall for much of VA. But if the temp crashes are correct then most of NC/VA with be a rain to snow. Even a few northern border counties of SC may see flakage depending on the amount of moisture available.

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RNK

 

.LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/...
AS OF 330 AM EDT WEDNESDAY...

MODELS WERE SHOWING A MORE AMPLIFIED TROF IN THE EAST BY MONDAY
BUT WERE STILL DIFFERENT ON THE TIMING. SIMILARLY...THE
DIFFERENCES IN THE MODELS SHOW UP ON THE SURFACE FORECASTS.
CANADIAN HAS A LOW OVER VIRGINIA BY SUNDAY MORNING WHILE THE 00Z
ECMWF HAS IT IN THE GULF OF MEXICO. COMPROMISE FROM WPC HAS AN
ELONGATED SURFACE LOW FROM GEORGIA TO THE CAROLINA COAST.

850 MB TEMPERATURES DROP BACK DOWN JUST BELOW ZERO BEHIND THE COLD
FRONT SATURDAY NIGHT. FORECAST AREA REMAINS IN THAT AIR MASS THROUGH
MONDAY. STILL THE POTENTIAL FOR A STRIPE OF SNOW OR WINTER
PRECIPITATION ON THE NORTHERN EDGE OF WHEREVER THE PRECIPITATION
SHIELD ENDS UP SUNDAY NIGHT AND MONDAY.

 

GSP

 

THE BIGGER DIFFERENCE IN THE MODELS OCCURS SUN THROUGH TUE WITH THE

EVOLUTION OF THE AFOREMENTIONED SFC BOUNDARY. WHILE THE GFS IS
MAINTAINING NEARLY UNIFORM FLOW THROUGH A DEEP LAYER AND THUS A
NEARLY STATIONARY COASTAL SFC FRONT...THE ECMWF AND CMC DEVELOP A
STRONG ULVL TROF AND COASTAL MILLER/A CYCLOGENESIS SUN NIGHT. THIS
LATTER SCENARIO WOULD BRING IN MUCH GREATER MOISTURE AND ALONG WITH
SOME MEASURE OF LOWERING PARTIAL THICKNESSES AND DIURNAL
COOLING...SN OR A RA/SN MIX SUN AND MON NIGHTS. THIS IDEA WAS GIVEN
A LITTLE MORE WEIGHT THAN THE TOTALLY SUPPRESSED AND DRY GFS SOLN.
THE GOING MID CHANCE POPS STILL LOOK GOOD SUN NIGHT THROUGH MON
NIGHT WITH SNOW ACCUMS ACROSS THE NC MTNS EARLY MON AND PERHAPS LOW
END ACCUMULATING SNOW INTO THE NC FOOTHILLS AND PIEDMONT MON NIGHT.
TEMPS WILL BEGIN THE PERIOD RIGHT AROUND NORMAL AND LIKELY DROP TO
8-10 DEGREES BELOW NORMAL BY MON WITH WINDS SHIFTING NE/LY AS A
CANADIAN HIGH BUILDS TO THE NORTH AND A BROAD ULVL TROF DEVELOPS
OVER THE ERN CONUS.

 

 

 

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