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1/25-1/26 Snow Threat


DDweatherman

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If you blend the Euro/GGEM/NAM/GFS, take 75% of it for QPF overinflation, pixie dust, non accumulating front end. and use 11:1 ratios, we still get over 4"

We might still be on last year's heater.
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Or we might strike out as we get closer :(

A bit close for their usefull range but there was maybe 1-2 euro ens members with more than .25. The mean was around .10.

Gfs and nam have done better leading into ns vorts so I'm not that concerned about the euro yet. All the ingredients are there for at least a moderate event.

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A bit close for their usefull range but there was maybe 1-2 euro ens members with more than .25. The mean was around .10.

Gfs and nam have done better leading into ns vorts so I'm not that concerned about the euro yet. All the ingredients are there for at least a moderate event.

 

I'm more weary of a north trend

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What a pretty map. Wes would be one happy dude if it verifies. 

 

attachicon.gifhappyhour.JPG

 

This sort of clipper -- considering the strength/amplitude of the upper shortwave, is essentially a northern Miller B.  We just have to hope the surface low tracks far enough south to lock in the cold air and keep us out of any dry slotting, but not too far south where we get moisture starved. What's interesting about this clipper is that because the upper shortwave is as amplified as progged (taking on a more negative tilt), the models maintain a discernible surface low throughout the process -- i.e. not like you're typical Miller B that weakens over the OH Valley and re-forms along the mid Atlantic coast.  That could be key in terms of maintaining the swath of at least moderate CCB precip east of the mountains -- if the surface low can stay to our south (while the 850 mb low remains closed off), we've got ourselves a real good shot here.  Areas just north of the 850 mb low would most probably hit the jackpot -- especially if we can get any closure at 700 mb.  Tthis would only help to deepen the moist easterly fetch/isentropic lift into a nice compact deformation band/comma head.

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21z SREF mean for DC is 0.25"+ and it looks to be all snow, with surface temps below freezing.  Closest 0.5" contour is offshore.

actually, I believe it's more than what may initially appear since the snow falls for >24 hours

we should take the 12 hr. map ending 63 hours and add to it the 24 hr. map ending 87 hrs.; they are below

http://mag.ncep.noaa.gov/Image.php?fhr=063ℑ=data%2Fsref%2F21%2Fsref_namer_063_precip_p12.gif&model=sref&area=namer&param=precip_p12&group=Model+Guidance&preselected_formatted_cycle_date=20150123+21+UTC&imageSize=&ps=model

http://mag.ncep.noaa.gov/Image.php?fhr=087ℑ=data%2Fsref%2F21%2Fsref_namer_087_precip_p24.gif&model=sref&area=namer&param=precip_p24&group=Model+Guidance&preselected_formatted_cycle_date=20150123+21+UTC&imageSize=&ps=model

 

 

 

EDIT: not that .25+ isn't correct, but I think it's closer to .35-.4" when both maps are considered

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actually, I believe it's more than what may initially appear since the snow falls for >24 hours

we should take the 12 hr. map ending 63 hours and add to it the 24 hr. map ending 87 hrs.; they are below

http://mag.ncep.noaa.gov/Image.php?fhr=063ℑ=data%2Fsref%2F21%2Fsref_namer_063_precip_p12.gif&model=sref&area=namer&param=precip_p12&group=Model+Guidance&preselected_formatted_cycle_date=20150123+21+UTC&imageSize=&ps=model

http://mag.ncep.noaa.gov/Image.php?fhr=087ℑ=data%2Fsref%2F21%2Fsref_namer_087_precip_p24.gif&model=sref&area=namer&param=precip_p24&group=Model+Guidance&preselected_formatted_cycle_date=20150123+21+UTC&imageSize=&ps=model

 

 

 

EDIT: not that .25+ isn't correct, but I think it's closer to .35-.4" when both maps are considered

 

That's a really good point, actually - thanks for catching that.  You must have taken your V8 today! :)

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