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CAD storms thread.


dsaur

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Well I'm in Nashville until next weekend so hopefully ill be able to report the cold air is pushing further south and east. Looks like ill be right on the line for getting anything note worthy here so like everyone else on here I'm rooting for.a stronger push of the HP!

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From Memphis:

249 AM CST WED DEC 4 2013

...WINTER STORM WATCH IN EFFECT FROM THURSDAY EVENING THROUGH
FRIDAY AFTERNOON...

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A WINTER STORM
WATCH...WHICH IS IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY
AFTERNOON.

* SNOW/SLEET/ICE ACCUMULATIONS...A HALF TO THREE QUARTERS OF AN
  INCH OF ICE ACCUMULATION. ONE TO TWO INCHES OF SNOW AND SLEET
  ACCUMULATION.

* TIMING...FROM 9PM THURSDAY EVENING TO 6PM FRIDAY EVENING.

* IMPACTS...VERY HAZARDOUS TRAVEL...DOWN TREE BRANCHES AND POWER
  LINES...AND THE POTENTIAL FOR MAJOR AND PROLONGED POWER OUTAGES.

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Read the Little Rock AFD from this morning... it's long and even they say so!

http://www.daculaweather.com/4_afd_lzk.php

 

"IF A CHANGEOVER TO FREEZING RAIN OCCURS SOONER THAN EXPECTED...A SIGNIFICANT ICE

STORM COULD UNFOLD. ICE ACCUMULATIONS OF AN INCH OR MORE WOULD BE POSSIBLE IN SUCH A SCENARIO."

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THe GFS and Euro not showing cold enough temps. I still think we need to track this because, as others have stated, the models may not be handeling the low level cold very well. We do have the NAM on board showing 32 degree dew points entering NW NC at hour 84. I know this is the NAM(at 84hr) but it may be correct in this case.  

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There is no way the cold is getting over the mountains. Its not even going to make it over the Cumberland plateau, much less the mountains.. The freezing line will likely be further south and east than currently modeled.

 

And those of you trying to hitch your wagons to the NAM. It was the warmest model until 0z yesterday. So - take that for what it is. The NAM is horrible outside 24 hours and just bad inside 24 hours.

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There is no way the cold is getting over the mountains. Its not even going to make it over the Cumberland plateau, much less the mountains.. The freezing line will likely be further south and east than currently modeled.

 

And those of you trying to hitch your wagons to the NAM. It was the warmest model until 0z yesterday. So - take that for what it is. The NAM is horrible outside 24 hours and just bad inside 24 hours.

 

Why would the freezing line be further south and east than modeled if the cold air isn't going to make it over the mountains?

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Yeah it's a pretty solid CAD setup, but the cold air never pushes far enough to the southeast prior to the CAD configuration taking shape...western trough / SE ridging (-PNA), +NAO doesn't drive the cold air in

Ok, thanks. Makes sense. I still think the model is in error with that, though. That's some cold air and that high is pretty stout.

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I'm saying that the cold isn't going to proceed east of the Cumberland plateau. If ya'll are talking about the NAM - its not even in the range of the possible CAD event yet, so I'm not sure why its relevant to the conversation.

 

I'm saying the initial push of cold air that's causing the actual winter storm thurs-saturday is not going to make it east of the Cumberland plateau.

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I'm saying that the cold isn't going to proceed east of the Cumberland plateau. If ya'll are talking about the NAM - its not even in the range of the possible CAD event yet, so I'm not sure why its relevant to the conversation.

I'm saying the initial push of cold air that's causing the actual winter storm thurs-saturday is not going to make it east of the Cumberland plateau.

absolutely spot on

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If ya'll are talking about the NAM - its not even in the range of the possible CAD event yet, so I'm not sure why its relevant to the conversation.

 

You are correct not sure why the NAM is being brought up. Check back on the NAM in another day or two when it will actually show the cad event.

 

The only model showing anything sig. is the one of the models I don't bother to watch. The CMC. That is the model people need to discuss if you are going against the euro/gfs.

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the 0z gfs is coming in colder. models prolly starting to see the cad effects fully now.  

 

You mean 12z and its been out. It did this yesterday showing a 1 maybe 2 degree cooling difference before warming back up at 0z.

 

This run glazes the trees on the VA border counties before going to rain at 1pm Sunday.

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You mean 12z and its been out. It did this yesterday showing a 1 maybe 2 degree cooling difference before warming back up at 0z.

 

This run glazes the trees on the VA border counties before going to rain at 1pm Sunday.

im talking about the mean model's as a whole. models as a whole have began to cool from their warm scenarios. there might be a few runs that have high temps though, i acknowledge that. but yea, this deff wont be a major ice storm for NC. cool to track though. 

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im talking about the mean model's as a whole. models as a whole have began to cool from their warm scenarios. there might be a few runs that have high temps though, i acknowledge that. but yea, this deff wont be a major ice storm for NC. cool to track though. 

I definitly would not bet(anything valuable) on a major ice event; but I still think it could happen (maybe 20% chance). Lets see how the next model runs look.   

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You are correct not sure why the NAM is being brought up. Check back on the NAM in another day or two when it will actually show the cad event.

 

The only model showing anything sig. is the one of the models I don't bother to watch. The CMC. That is the model people need to discuss if you are going against the euro/gfs.

 

The Canadian(especially the RGEM) is actually an excellent CAD model.

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The models don't seem to want freezing rain during the afternoon. Cold gets kicked out Sunday morning. I would be stunned at this point if it turned into a ice storm lasting into Monday south of the VA border.

There are a lot of things that scream NO ICE STORM! I would have to say at this point most people in NC will only see cold rain. But we do need to continue to track the placement of the cold and the source high. As others have stated the models can have difficulty with these CAD situations. And we are now looking at a difference of 1-3 degrees being huge.  

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