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December 16/17 threat


stormtracker

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post-1837-0-76703200-1292258143.jpg

But there is still a disconnect between the 500h trough (way north and weak) and the surface wave. That makes me think the lighter GFS is probably more right than the NAM for precip amounts especially up near dc. I could see a dusting to an inch but doubt much more than that for DCA and my house.

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Afternoon AFD from LWX

I`VE INTRODUCED MENTION OF SN INTO THE FCST FOR THU AS LOW PRES

DVLPS OVR KY AND MOVES INTO THE MID ATLC RGN THU AFTN. THERE IS

SOME DIFFERENCE IN THE MDLS REGARDING THE XACT TRACK OF THE

LOW...BUT IT LOOKS LK THE TRACK WL BE FAR ENOUGH TO THE S THAT LWX

CWA SHOULD BE IN THE COLDER AIR - ALL SIGNS ARE 850 TEMP WL BE BLO

FRZG SO SN LOOKS TO THE P-TYPE. WE`RE STILL 3 DAYS AWAY....BUT THE

TRACK IS SUCH THAT A COUPLE OF INCHES COULD FALL OVR PARTS OF THE

CWA. FOR NOW HV INSERTED CHC POPS FOR THU AFTN. LATER SHIFTS CAN

EXPAND/REFINE AS NEEDED.

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Guest someguy

But there is still a disconnect between the 500h trough (way north and weak) and the surface wave. That makes me think the lighter GFS is probably more right than the NAM for precip amounts especially up near dc. I could see a dusting to an inch but doubt much more than that for DCA and my house.

FOR DC I strongly agree

the Massive vortex / cold air ensured that for DC may not get into IT

earlier today I got into big debate with some RIC TV mets that even for RIC this might not be any sleet and the bigger issue would be more to the south and a flatter wave

thats is huge friggin vortex over Maine ....

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It does but it is all by itself.

Looks like the 6Z nam on the 700 mb humidity tries to link up the weekend storm with the back edge of precip from the clipper on Friday. Nam looks good at 500 mb and 700 mb at 84 hours it would appear, as the northern vort seems to be showing signs of dropping in. Who knows with the 84 hour NAM though.

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Guest someguy

Our qpf is .10-.25, i would take that as an appetizer before hopefully our Sat night Sunday storm.

I would be surprised if thursday if you got that Much

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Looks like the 6Z nam on the 700 mb humidity tries to link up the weekend storm with the back edge of precip from the clipper on Friday. Nam looks good at 500 mb and 700 mb at 84 hours it would appear, as the northern vort seems to be showing signs of dropping in. Who knows with the 84 hour NAM though.

Well the 12z 84 hr nam now agrees with Ukie, but that and a dollar will get you a can of soda.

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12z GFS 700mb RH maps at 48 would suggest at least some fluries/snsh...

Rgr - 12z GFS remains bullish on this through 60hrs. Main question as far as GFS goes remains the temps - although I still suspect the NAM is more realistic in squashing things towards the south.

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