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WxChallenge 2013-14


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Went 34/25/17/0.15"

 

Models appear to be too quick in bringing in the cold air this evening...I see them struggling to dip much below 30 tonight. The north winds slacken by morning and there should be a few hours before any precip moves in so I have them warming up a few degrees in the morning. After the precip moves out tomorrow evening I don't think skies will clear particularly fast and there won't be any strong CAA or anything of that nature, so I went much closer to the NAM MOS for the low which should be a 6z low tomorrow night. Winds picked up for the 0z ob but will probably peak a bit before 6z, so we'll see how that goes. Precip is a crap shoot. On one hand just about all global models show Atlanta near the northern edge of but solidly in the precip shield tomorrow...but it's close. The NAM is wetter than the Euro but close to the GFS with around 0.20" of QPF for ATL. It'll be a sharp cutoff near or just north of ATL and the NAM suggests the best lift occurring just south of Atlanta, so I went a bit drier than the NAM/GFS.

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Went with 33/27/18/0.10"... I think my 33F is already shot (won't get up that high in the afternoon), and my 27F seems to be in danger. Didn't think they'd be this cold already.

 

I do think they'll have a harder time falling tomorrow evening, still, but they'll probably see a morning low below my forecast low.

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Went 29/12/16/0

 

Feel good about the winds and precip. As for the low, temperatures have been slowly falling all afternoon, and with continued NNW winds and mid level temperatures cooling several more degrees tonight...to go along with some clearing late...I think they can drop another 9 degrees overnight. It's a gamble, but I'm pretty sure we'll at least get colder than the consensus low of 17. With some clouds, a continued NNW flow and some snow cover I undercut guidance for the high as well, which I don't think is as big of a gamble as the low. With 850mb temps struggling to warm above -8 to -10C, a NNW flow and snow cover I personally doubt they get to freezing and it could stay in the 20's.

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Went 37/14/11/0

 

Wasn't sure what to do with the low...they should be in a favorable environment for radiational cooling most of the night with snow cover to boot, so went with the colder GFS MOS...dews are sitting at 2 right now which is much lower than what the NAM suggests. But it is Atlanta and they don't radiate as well as some other places...we'll see. For the high undercut MOS by a few degrees. The models suggest an inversion may be in place most of the day limiting how much mixing can occur...and there will still be some snow on the ground. Went a bit high on winds, they've over-performed everyday so far.

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