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Jan 21 Event


Poimen

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The 0z runs of the RGEM, UK and GGEM all agree with GFS. In about 90 mins the Euro will join the camp. Really the only discussion is who jackpots, DT or JI, my money is on JI, it always snows for him We may see flurries,

 

Honestly its looking more and more likely while nam is the outlier.  Go figure. :unsure:  :wacko:

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Gfs is accurate spring-fall. Seems to never verify when its by itself in winter

Oh, I guarantee you it will verify with Tuesday's snow.

We have got to have southern system for us to have a half a chance of a winter storm, just wait till a nice gulf low forms there want be a temp below freezing in the lower 48. Lol

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I hope he is wrong, i want some dang snow!!!!

Same here.

 

All those folks going crazy in the mid atlantic posting GFS,CMC,RGEM maps and its alot further north I will admit that. 

 

But this s/w is gonna have to make a hell of U turn to crank up and hit them. I could understand if it was dropping out of Montana but its not.

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The 0z euro looks similar to the 0z gfs.  This is looking like a light event for NC...Yawn!

 

It looks pretty similar to recent runs. It never showed this being huge, but has shown accumulating snowfall across northern and eastern NC (which it still does).  It isn't as bullish as the GFS with snowfall up towards DC, either, with a 2-5" stripe stretching from Blacksburg over towards south of DC over towards central Delaware.

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For those of you in GSP's CWFA here is last nights disco on this event.

 

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
AS OF 300 AM MONDAY...ARCTIC FRONT PUSHES INTO THE AREA TUESDAY.
ASSOCIATED SHORTWAVE WILL DIG THRU THE MEAN ERN CONUS TROUGH AS
WELL...DEPARTING THE CWFA FAIRLY QUICKLY TUE EVENING. NW FLOW SNOW
SHOULD ALREADY BE UNDERWAY AT DAYBREAK TUE AND ACTIVITY WILL PEAK AS
THE FRONT PUSHES ACRS THE MTNS AROUND MIDDAY. GIVEN THE STRENGTH OF
THE SYSTEM AND ORIENTATION OF THE FRONT...PRECIP DOES NOW LOOK
POSSIBLE OVER MUCH OF THE PIEDMONT AS WELL.

DIFFERENCES CONTINUE TO BE NOTED IN THE MODELS AS TO THE SWD REACH OF
THE FRONT AND THE UPPER WAVE...AND ACCORDINGLY THE LOCATION OF
GENESIS OF THE SFC CYCLONE WHICH DEVELOPS OVER THE ERN CAROLINAS
BEFORE LIFTING UP THE MID ATLANTIC COAST. WHILE THE POSITIONING OF
THE SFC LOW IS PRETTY CLOSE BETWEEN THE NAM/GFS/EC/SREF MEMBERS...
MINOR DIFFERENCES COULD HAVE A SIGNIFICANT IMPACT ON QPF AWAY FROM
THE NW FLOW AREAS.
WITH TEMPERATURES PLUMMETING LATE IN THE
EVENT...THIS IN TURN SUGGESTS UNCERTAINTY AS TO SNOWFALL AMOUNTS.
NAM IS WETTER THAN THE GFS/EC...WITH THE NAM LENT CONFIDENCE BY THE
SREF MEANS
. BASICALLY THE GFS/EC ARE SLIGHTLY FURTHER NORTH WITH THE
BEST FORCING AND MOISTURE. HOWEVER...RUN TO RUN CONSISTENCY IS
REASONABLY GOOD FOR EACH MODEL CAMP.
NW FLOW SETUP FEATURES A DEEP
SATURATED LAYER WITH WINDS BEING WELL ORIENTED FOR A FEW HOURS
ESPECIALLY AROUND MIDDAY. GFS FEATURES A LLVL PV ANOMALY...AND BOTH
NAM/GFS SUGGEST SOME EPV COULD BE AT PLAY DURING THE EVENT EAST OF
THE MTNS.
SO QPF WAS KEPT ON THE HIGH SIDE OF AN AVERAGE OF THE
GUIDANCE.

TEMPS OVER THE PIEDMONT SHOULD BE ABLE TO RISE SOMEWHAT EFFICIENTLY
BEFORE THE FROPA...SO MOST OF THE PRECIP WILL FALL AS RAIN SOUTH OF
I-40.
IT IS NOT REALLY UNTIL PRECIP TRAILS OFF AS THE FRONT SAGS DOWN
AND THE SFC LOW TRACKS EAST LATE TUE AFTN THAT TEMPS BECOME FAVORABLE
FOR WINTRY MIX OR SNOW THAT FAR SOUTH. ONLY SLIGHT CHANCE POPS ARE IN
THE FCST AT THAT TIME...AND ACCUMS ARE MINIMAL OUTSIDE THE
MTNS/FOOTHILLS.
THUS NO HEADLINES WILL BE RAISED OUTSIDE THE NW FLOW
AREAS AT THIS TIME. FOCUSING THE BLENDED QPF ON THE MIDDAY PEAK IN
THE MTNS...AND WITH LIGHT SNOW CONTINUING THERE TUE NIGHT DUE TO
LINGERING LLVL MOISTURE...WARNING CRITERIA ACCUMULATIONS MAY OCCUR IN
PORTIONS OF THE ZONES ALONG THE TENN BORDER. THUS WE WILL RAISE A
WINTER STORM WATCH THERE...EXTENDING IT UNTIL 600 AM WEDNESDAY FOR
WHAT IS LIKELY TO BE PERSISTENT LIGHT SNOW ALONG THE SPINE...AS WELL
AS FOR THE WIND CHILLS WHICH WILL ACCOMPANY THE STRONG POST FRONTAL
WINDS. AT THIS TIME IT LOOKS LIKE WIND GUSTS UP TO 40 KT ARE LIKELY
IN THE HIGHER TERRAIN TUE AFTN/EVENING. WILL WRAP WIND INFO INTO THE
WSW.

LOW TEMPS WED MORNING WILL BE MOSTLY IN THE SINGLE DIGITS IN THE MTNS
AND TEENS FOOTHILLS/PIEDMONT. SAVE FOR SOME LINGERING CLOUDINESS IN
THE UPSLOPE AREAS OF THE MTNS...MOSTLY CLEAR SKIES WED WILL PERHAPS
OFFER SOME RELIEF FROM THE VERY COLD HIGH TEMPERATURES 15-20 DEGREES
BELOW NORMAL. UPPER MOISTURE SPREADS OVER WED NIGHT ALONG WITH THE
RETURN OF SOME VERY WEAK WAA AS WEAK HIGH PRESSURE SETTLES OVER THE
SOUTHEAST. LOWS THU MRNG WILL REBOUND A FEW DEGREES VS WED MRNG.

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I'm not really sure how most of NC will see anything more than flurries or a brief period of light snow leading to maybe a dusting in spots (outside of maybe the boarder counties) with the progged track of the vort. You have to throw the NAM away here. Every time I observe these situations where the NAM paints more QPF than the other models, it's almost always overdone. These things usually trend north. There are exceptions, but they are rare, and this does not look like one of those times.

Not trying to be a negative nancy, but the energy is on shore and should be well modeled now, so any surprises in our favor are very unlikely. The 6z GFS is even drier. The vort tracks along the VA/NC boarder and it's preceded by a weak surface low moving across the state....not a good setup for accumulating snow. I'll bet the 12z runs come in even drier.

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I'm not really sure how most of NC will see anything more than flurries or a brief period of light snow leading to maybe a dusting in spots (outside of maybe the boarder counties) with the progged track of the vort. You have to throw the NAM away here. Every time I observe these situations where the NAM paints more QPF than the other models, it's almost always overdone. These things usually trend north. There are exceptions, but they are rare, and this does not look like one of those times.

Not trying to be a negative nancy, but the energy is on shore and should be well modeled now, so any surprises in our favor are very unlikely. The 6z GFS is even drier. The vort tracks along the VA/NC boarder and it's preceded by a weak surface low moving across the state....not a good setup for accumulating snow. I'll bet the 12z runs come in even drier.

Yep, not looking too promising at the moment.

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The 0z euro looks similar to the 0z gfs. This is looking like a light event for NC...Yawn!

The 3Z SREF puts downs a stripe of .25 qpf across northern NC on a line from northern Wake County to the coast.

I would gladly take a couple of inches of snow. You have to break the drought somehow. This might be all we get this winter, and after the last two, we should be happy to get what we can.

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DT has me in 2-4 and Alan has me in 0.5-1and NWS up to 1 inch ? I say there's a chance I may see an inch out of this?

Allan Huffman @RaleighWx 1h

My first forecast map for Jan 21-22nd event. Will update later today if data warrants changes. #snow pic.twitter.com/4J4oJeNupJ

 
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4:47 AM - 20 Jan 2014 · Details Flag mediaFlagged (learn more)
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Frosty, completely ignore DT's map. Completely ignore it. Allan's guess, while still maybe a bit high, is much better.

I agree 1000% he has never been close with a snow forecast for my area (NEVER) just threw it out for kicks and giggles!  Honestly I would guess I mostly get down sloped and less than an inch if that... :axe:

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