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Feb 13: The little storm that could (for some)


Ian

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I think this might be OK for DCA to BWI and NW. At some point between 42 and 48 we flip to snow and what falls afterwards is money. Certainly not a doomsday scenario and the best look in a while, I think.

In a marginal setup like this it is unlikely that DCA does as well as BWI and north.

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Mitch, extrapolate the NAM right now to PD3.

well, OK

here's the 84 hr NAM 700mb RH

http://mag.ncep.noaa.gov/Image.php?model=nam&area=namer&param=700_rh_ht&cycle=00ℑ=nam%2F00%2Fnam_namer_084_700_rh_ht.gif

here's the 90 hr GFS from 18z run

http://mag.ncep.noaa.gov/Image.php?model=gfs&area=namer&param=700_rh_ht&cycle=18ℑ=gfs%2F18%2Fgfs_namer_090_700_rh_ht.gif

 

looks pretty similar down in OK and KS, which is where the GFS had the slp forming

 

you asked, I performed

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You are wrong.

Really? Maybe I was looking at the older run..if so my bad!

 

Edit: just checked again on Raleigh...lookin' at 2m temps at 54 and the 32 line is well NW of DC and then at 60 it has just passed SE of DC...am I looking at the wrong map?

 

http://raleighwx.americanwx.com/models/nam/00znampmsl10mwinds2mtemps060.gif

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Really? Maybe I was looking at the older run..if so my bad!

 

Edit: just checked again on Raleigh...lookin' at 2m temps at 54 and the 32 line is well NW of DC and then at 60 it has just passed SE of DC...am I looking at the wrong map?

 

http://raleighwx.americanwx.com/models/nam/00znampmsl10mwinds2mtemps060.gif

You need to look at soundings and also realize it can snow at 33-34 degrees. Happens all the time.

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Ah I don't have access to soundings...well that's good news I guess.

 

Everyone has access ;) - they are public - just need to find a website. We've seen it snow at 38 or 39 plenty of times if it's cold aloft. Not all about one layer of the atmosphere!

remember it's not just about surface - you need to factor in all the important levels (surface, 950, 850 are the biggies)

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