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November 2013 pattern and discussion


WxJordan

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. It's really getting good now!!!! The first DGEX map posting of the year!! I'm not sure what year it was, 2000 , if I recall, had several snow/ winter precip events through about the whole month of November, anybody remember this?

 

Was just about to post the same thing, you beat me to it.  It's officially winter storm tracking season when DGEX porn starts getting posted, haha!

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I would be lying if I said I was not a bit excited, but I’m also extremely pessimistic. It is really hard to get accumulating snow outside the mountains this time of year. If this was one month later I would be really excited, but we need to acknowledge the time of year. Even if the models keep showing the snow right up to the event, I’ll be surprised if it actually snows. Not trying to be a downer but just being realistic.   

 

It has happened before (2000 I think) but even then the snow had to fight warm ground temps. We did end of with a couple of inches but the roads were never a problem. I remember walking down the street thinking “man it just snowed and there still isn’t Christmas lights up yet”.       

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Well here's RAH's discussion from last night:

 

FOR TUESDAY THROUGH WEDNESDAY: THE CALM WEATHER APPEARS TO BE COMING
TO AN END BY MIDWEEK AS BOTH THE GFS AND ECMWF SHOW A TREND TOWARD
UNSETTLED WEATHER. THE POLAR COLD FRONT CONTINUES TO PUSH SOUTHWARD
TOWARD NC TUESDAY... LIKELY PUSHING THROUGH THE STATE TUESDAY
EVENING OR NIGHT... PROPELLED BY A STRONG SHORTWAVE TROUGH DROPPING
SOUTH THROUGH THE UPPER MIDWEST. LOW LEVEL THICKNESSES OVER NC ARE
EXPECTED TO PLUNGE BEHIND THE FRONT WITH A CHILLY AIR MASS BUILDING
IN... FALLING AT GSO TO 1305 M ON THE 00Z/07 GFS AND TO A
BONE-CHILLING 1275 M ON THE 00Z/07 ECMWF (WHICH SEEMS FAR TOO LOW
FOR THIS TIME OF YEAR). THESE LATEST MODEL RUNS ARE INDICATING THIS
MID LEVEL SHORTWAVE ENERGY DROPPING THROUGH THE MID MISS VALLEY
BEFORE CLOSING OFF A LOW OVER THE OH VALLEY... WHICH WOULD PROMPT
INCREASING FORCING FOR ASCENT OVER THE SRN APPALACHIANS THROUGH THE
MIDATLANTIC AND NRN NC. AS THE MID LEVEL LOW INCREASES IN DEPTH DOWN
TO 700-850 MB... STRENGTHENING SW FLOW AND LOW LEVEL MOISTURE RETURN
AHEAD OF THE FRONT ALOFT MAY BRING A GOOD CHANCE OF PRECIP TUESDAY
NIGHT INTO WEDNESDAY AND POSSIBLY BEYOND. IT`S HARD TO IGNORE THAT
PROJECTED PARTIAL THICKNESSES ON BOTH THE GFS AND ECMWF DO BRING
ABOUT A CONCERN FOR POSSIBLE WINTRY PRECIP IN OUR FAR NRN AND NW
SECTIONS... ALTHOUGH THE 00Z/07 ECMWF IS AT SUCH AN EXTREME (AND
MUCH STRONGER/COLDER THAN ITS PREVIOUS RUN)... WITH ITS 850 MB TEMPS
FALLING WELL BELOW ZERO (TO -9C AT GSO) AND A PARTICULARLY INTENSE
MID LEVEL VORTEX OVER WV BY THURSDAY MORNING... THAT IT`S TOUGH TO
BUY INTO IT. SINCE THE NEW ECMWF IS SO MUCH MORE DRAMATIC THAN ITS
PREVIOUS RUN AND WITH LITTLE TO NO SUPPORT FROM ITS WASHED-OUT ECMWF
ENSEMBLE MEAN... FOR NOW WILL GO WITH CHILLY (BUT ABOVE-FREEZING)
TEMPS TUESDAY NIGHT INTO WEDNESDAY WITH A CHANCE OF RAIN. BUT THIS
STORM SYSTEM WILL CERTAINLY BEAR WATCHING. DESPITE THE DIFFERENCES
IN THERMAL STRUCTURE... IMPOSSIBLE TO RESOLVE AT THIS RANGE...

MODELS DO AGREE ON AMPLIFYING TROUGHING OVER THE EASTERN CONUS WITH
AN UNIMPEDED TAP INTO TRUE POLAR AIR INTO THE REGION AND AT LEAST
SOME AMOUNT OF MOISTURE INFLUX. STAY TUNED. -GIH
 

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Folks,

 The 0Z THU doctor is another run going crazy with SE cold..this one 11/13-15 causing hard freezes many areas 11/15!

 

And yet just a couple of days ago the models were predicting a major SE ridge during this time.  That's got to be the biggest flip I've ever seen.

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And yet just a couple of days ago the models were predicting a major SE ridge during this time.  That's got to be the biggest flip I've ever seen.

 

Models don't initially handle the impacts of storms such as this 948 mb storm depicted below very well. It is not surprising that a piece of cold air is going to be flung SE ward landing somewhere in the Eastern U.S.

post-9361-0-69019200-1383828901_thumb.jp

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Interesting pattern and storm to watch for sure; however, I am not totally bought in on the idea yet.  The trend will be very important to watch the next couple of runs to see if the cold air remains or does the solutions begin to push north.

The teleconnections appear to be moving neutral, which would help to push the front through and possibly cause the low to spin up the coast; however, it is not the mostly likely solution right now.  Right conditions must be present to cause the storm to wrap itself up like that, so more time will be needed to accurately determine what will happen with the storm.

It is amazing to be talking about this possible solution at this point of the winter.  Maybe this is a good omen of what is to come.  For the past few years, we have had really cold air modeled only to be replaced by warm air.

This will be interesting to watch; however, it does appear cold air will be making a run at the southeast sometime next week.

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Remarkable agreement all the way out to 180hrs between the operational 00z ECMWF and GFS at 500mb. The 06z GFS did speed up the timing a bit, but also dug the trough a little farther south which would be a substantial hit for a lot of NC. A look at the individual 06z GFS ensemble members reveal that a good number now have a fairly sharp trough in roughly the same position as the operational run at 180hrs, just not as intense.  

 

For now, it does seem safe to say with some confidence that the coldest temperatures of the season are coming next week, and I'd have to argue that the chances for at least a few flakes in the air in northern NC and all of VA are slowly rising as well!!

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12Z solutions will be north and west.  Book it.

 

The one thing I like so far that is real, is that the warm-ups keep getting pushed back or replaced by patterns that produce normal or below normal temps.  The first warm-up was seen in late October to commence in early November.  Then, around of the first of the month, it was supposed to warm up around mid-month.  Now, it looks like that is off.  Maybe late November/early December now?  Anyway, no torches yet.

 

Aleution ridging has been pretty persistent of late.  The GOA vortex this year hasn't been a stationary feature either.  It seems to form and migrate to the SW.  That keeps repeating in the modeling.  Anyway, it certainly looks like a different pattern than the last couple of years.

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I am here Brick. Always will be for interesting weather in our region.

 

Obviously climo argues very strongly against any type of widespread significant wintry weather in mid-November for NC. Greatest snowfall for RDU on record in November is 3.6 incehs on Nov 20th 1914.

 

We did get 2.2 inches of snow on Nov 19th, 2000. And we had measurable snow of 0.4 inches on Nov 21st 2008.

 

It is certainly rare.

 

This pattern would be an odd one to produce a wintry event especially outside the normal climo time with a very +AO/+NAO. The s/w of note looks to move into Alaska tomorrow, so we should see a bit more stability in the modeling solutions, I would think in 24-48 hours.

 

With the setup not ideal synoptically (we depend a lot on timing) and this being mid November, the odds are heavily against something. Keep in mind this is still 6 days out so we have plenty of time for wild model swings.

 

However, the fact tha the op GFS and ECMWF and a fair number of their ens members show it, does raise the alert a bit.

 

It is fun to see and worth following, but dont get too excited yet.

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