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January Pattern and Storm Discussion II


Cold Rain

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I don't look at the NAM for 5+ day threats. It is better 1-2 days out IMO.

You're kidding right?  LOL, someone needs a lesson on Sarcasm.   

 

I saw the EPS run of the Euro and it did shift it south.   I think you NC, TN, KY folks are in the game on this one, unfortunately I think us GA,SC,AL folks maybe out of this one.  

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We were always out of this one unless a second wave of low pressure develops in the northern gulf and hangs up the front long enough to get moisture on top of the cold. We should move on, nothing to see here...

You're kidding right?  LOL, someone needs a lesson on Sarcasm.   

 

I saw the EPS run of the Euro and it did shift it south.   I think you NC, TN, KY folks are in the game on this one, unfortunately I think us GA,SC,AL folks maybe out of this one.  

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It's just very hard to get excited about a low coming through TN. Just check the Euro EPS control run and it does shift snow south of I-40....guess we will wait and see. 

I agree.  These clipper/miller B type events never really produce for us here in the SE.  

 

Does this storm have more potential to dig farther S, and tap into the Gulf?  Or is that not possible due to weak ridging out in the W? 

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We were always out of this one unless a second wave of low pressure develops in the northern gulf and hangs up the front long enough to get moisture on top of the cold. We should move on, nothing to see here...

 

 

I agree, I'm close enough though I would chase to the mountains if it were feasible.   But that's not looking to good either  (talking about north GA mtns).  I know the Euro gave a little blip of an inch in Extreme NE GA, but not liking the chances.  

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I agree.  These clipper/miller B type events never really produce for us here in the SE.  

 

Does this storm have more potential to dig farther S, and tap into the Gulf?  Or is that not possible due to weak ridging out in the W? 

There's probably only so far south the wave can dig due to the ridge out west. It's not very sharp or tall, which is probably due to the PV hanging out just east of Alaska. Doesn't mean the models are exactly right with their placement and orientation of PVs/ridges/shortwaves 4-5 days out, but generally, you'll want to watch for a sharper, taller ridge out west and a little more confluence in the NE. There's still plenty of time for things to change more favorably...or for the worse.

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RAH is still waiting to see what model has the best grasp of the situation:

 

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
AS OF 300 PM MONDAY...

NORTHERN STREAM SHORTWAVE TROUGH OVER THE NORTHERN ROCKIES/PLAINS ON
THURSDAY IS FORECAST TO AMPLIFY OVER THE PLAINS ON FRIDAY AS IT
PROGRESSES EASTWARD...MEETING UP WITH THE LINGERING COLD UPPER
TROUGH OVER THE EASTERN US. PRECIP WITH THE SYSTEM WILL INITIALLY BE
SPARSE...BEFORE A DEVELOPING SURFACE CYCLONE ALONG THE SOUTHERN
PLAINS/MID MS VALLEY WILL GIVE RISE TO AN EXPANDING(MORE ORGANIZE)
PRECIP SHIELD. THE SURFACE LOW WILL TRACK EAST-NORTHEASTWARD INTO
THE MID-ATLANTIC REGION...DRAGGING A COLD FRONT THROUGH THE AREA
LATE FRIDAY AFTERNOON/FRIDAY NIGHT.

MODEL SPREAD REMAINS LARGE WITH THE TIMING...STRENGTH/TRACK OF THE
SYSTEM...RESULTING IN BELOW AVERAGE CONFIDENCE WITH THIS SYSTEM.
THE
MULTI-DAY TREND HAS BEEN FOR A SLOWER-MORE SOUTHERN SOLUTION...WHICH
WOULD DELAY PRECIP GETTING INTO THE AREA UNTIL AFTER 12Z FRIDAY
BUT ALSO RESULT IN MUCH COLDER TEMPERATURES WITH THE POTENTIAL FOR A
DAMMING EVENT TO ENSUE ON FRIDAY WITH POSSIBLE P-TYPE IMPLICATIONS

AS WARM AIR CONVEYOR FEED ALOFT OVERSPREADS THE ANTECEDENT COLD
ARCTIC AIR IN PLACE. THIS PART OF THE FORECAST WILL REQUIRE
MONITORING OVER THE NEXT COUPLE OF DAYS...WITH THE EVENTUAL TRACK OF
THE LOW PRESSURE AREA PIVOTAL IN DETERMINING P-TYPE ACROSS CENTRAL NC
FRIDAY AND FRIDAY NIGHT. CASE IN POINT...THE LATEST 12Z/21 EC HAS
SHIFTED SIGNIFICANTLY FARTHER SOUTH...NOW TRACKING THE SURFACE
LOW ACROSS THE CAROLINAS...WHILE THE GFS TRACKS THE LOW THROUGH THE
VIRGINIA/DISTRICT OF COLUMBIA.  NOMOGRAM PLOTS BASED ON THE EC WOULD
SUPPORT A WINTRY MIX OVER THE WEST OF THE TRIANGLE...WHILE THE GFS
WOULD SUPPORT A COLD RAIN. WILL ADVERTISE A COLD RAIN FOR NOW(ALTHOUGH
THAT COULD CHANGE IN THE NEXT DAY OR TWO)...WITH POPS INCREASING
FROM THE WEST DURING THE LATE MORNING HOURS...MAXIMIZED BETWEEN TO
03Z...AND EXITING EASTERN AREAS BETWEEN 06 TO 12Z SATURDAY.

STRONG CANADIAN HIGH BUILDING EASTWARD OUT OF THE CENTRAL
US WILL USER IN ANOTHER CP AIRMASS SOUTHEASTWARD ON SATURDAY...
SUPPORTING TEMPERATURES WELL BELOW NORMAL SATURDAY AND SUNDAY.
TEMPERATURES SHOULD BEGINNING TO MODERATE EARLY NEXT WEEK AS EASTERN
US TROUGH LIFTS OUT WITH S/W RIDGING ALOFT BUILDING EASTWARD OVER
THE REGION.

&&
 

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This whole storm threat is being driven by a northern stream wave. We would need that to dig south of the Carolinas for this to be anything more than a brief mix at the onset. With the PNA ridge breaking down color me unexcited about the prospects for that type of digging to.actually occur.

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It;s important to remember the Euro ensembles at 0z Saturday a.m. painted a strip of 1-2 inches across northern NC. So it's not like the Euro operational has had some major hiccup. In fact it's go more consistent support from it's ensembles than the GFS IMO up to this point. For all the cold chasing rain never works argument crowd(myself primarly) we just had the cold chase the rain Thursday and win out for once for alot of us.

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It;s important to remember the Euro ensembles at 0z Saturday a.m. painted a strip of 1-2 inches across northern NC. So it's not like the Euro operational has had some major hiccup. In fact it's go more consistent support from it's ensembles than the GFS IMO up to this point. For all the cold chasing rain never works argument crowd(myself primarly) we just had the cold chase the rain Thursday and win out for once for alot of us.

 

It was a bust for most outside the Triad and northern NC apps. Anyway I am still not on board for very much from this.

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it was also not a case of cold chasing moisture really. 

I'll give you that, since it was coming from top-down(dynamical cooling). I'm by no means a cold chasing precip fan. The difference we have with this possible setup is the cold air we 'll have been firmlly entrenched in NC. I'm more optimistic the NC CAD areas will see winter precip and I lean way more toward sleet/frzng rn as oppossed to all snow or all rain. Cold air is dense and sometimes fliys under the radar so to speak in model world because it's so shallow. I don't see this event as a wet one on this side of the apps and really would be suprised to get more than .25-.40. I'd be more concerned with getting dryslotted(carolina split) the way things stand now compared to just cold rain. Who knows the outcome, i'm just tossing out opinions into the mix of all the pros and cons while we chase. MO is the other models will come around to the euro/euro ensemble camp.

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Not much was said about the 18z GFS...but it did trend better from 12z. Do any of the members look good for us?

 

 

One thing I did notice it 500 keeps ticking better. Just a hunch but I have a feeling the gfs will start trending south with the surface low tonight. It's showing up in the approach and pass of the ull energy. These comparisons show what I'm talking about (12z on left - 18z on right):

 

 

 

attachicon.gif 12-18zgfs5h.JPG

 

attachicon.gif 12-18z500.JPG

 

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One thing I did notice it 500 keeps ticking better. Just a hunch but I have a feeling the gfs will start trending south with the surface low tonight. It's showing up in the approach and pass of the ull energy. These comparisons show what I'm talking about (12z on left - 18z on right):

 

 

 

attachicon.gif 12-18zgfs5h.JPG

 

attachicon.gif 12-18z500.JPG

 

Nice post man.

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There only 2 18z GEFS members that were Euro like, rest had fairly good agreement to the Op (with some close degree of variability).  The GFS has been fairly good this winter, IMO....
 

Although when looking at the snowfall accum. maps it appears there are a couple more that give N-NC snow.

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For what it's worth, Accuweather puts the end of the work week "storm" on a track that puts the east coast south of DC in the rain.

 

Just covering all the tracks. Frank acknowledges potential.

 

 

New vlog! http://t.co/GsOXMIeU Chance my "1 more #snow this year" forecast for @aaliyah_hailey works out by Friday night.
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A little confused...some here are saying clipper or cold front. I usually refer to clippers as dry cold snow. Fronts as wetter rain chasing snow etc. or wintry mix whatever the case may be.

 

Accuweather is showing two pieces of energy that will merge, which is what I am seeing. So this is likely not a potential cold dry snow from a clipper am I right? I expect storms/moisture from the GOM...etc.

 

I know some earlier were questioning the validity of getting winter precip coming from the north, which is why I ask.

 

400x266_01211657_stormmerge.jpg

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