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January: Medium/ Long Range: May the Force be with Us....


Weather Will
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1 minute ago, bncho said:

This winter was expected to be a bum. Now we might be looking at AN snowfall and BN temps.

It is absolutely too early to be discussing seasonal temp results when astronomical winter started like 11 days ago. And seasonal precip too for that matter. 

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30 minutes ago, WEATHER53 said:

If this pans and roads are decent we gotta do a meet up. Ebbits doesn’t do the half price anymore and do any of you guys have a favored raw bar close to city but not necessarily in it?

I can pick you up if needed and would be a pleasure !

We actually haven't found a new hangout yet.  We need to find a new wx nerd HQ and I'm in!

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Euro is most important today as other models have been trending towards it. Important to see if it holds serve or starts trending a dif direction. Last night you guys were hugging the gfs at midnight now you could careless cause its not good for your backyards. You guys are funny when it comes to snow.

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1 minute ago, jlewis1111 said:

Euro is most important today as other models have been trending towards it. Important to see if it holds serve or starts trending a dif direction. Last night you guys were hugging the gfs at midnight now you could careless cause its not good for your backyards. You guys are funny when it comes to snow.

Well one, the gfs is the worst model currently and two its own ens don’t really agree with it. 

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1 minute ago, Weather Will said:

Refresh my memory on when we should stop looking at ensembles.... I generally would stop leaning on them inside five days.

Probably not till like 72hrs out. You don’t stop looking at them inside 5 days lol. 

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19 minutes ago, yoda said:

Quite the temp gradient on the 12z UKIE right after the storm; on monday night, DCA is 22 while CHO is 3

Same thing Tuesday night... DCA 27, EZF 11, CHO -5

Fresh snow + new artic airmass = undercut low temps.

9 minutes ago, Weather Will said:

Refresh my memory on when we should stop looking at ensembles.... I generally would stop leaning on them inside five days.

I stop relying on ensembles within 48 hours before an event.

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55 minutes ago, yoda said:

@Terpeast @MillvilleWx

Question - 12z CMC shows sleet nearby.  However, checking the column/soundings, only the 750mb to around 800mb level (maybe 825mb) goes above 0c.  EZF at 120 has it around 1C.  Is that enough to wreck snow accumulation?  The warm zone is so small that I don't think it would make a big deal?

The model very likely has a small decision tree approach when it comes to ptype dissemination, so any nose above the 0°C threshold will ultimately shift the ptype to a more mixed variety. Pending the depth of the omega between 850-600mb and the intensity of the precip, the result could still yield snowfall, albeit more clumped aggregates and lower ratios. The warm advection regime within the boundary layer will ultimately cause a changeover somewhere with the current southerly flow magnitude being progged. Climo suggests those Fredericksburg on south would have the highest potential with Southern MD likely to be next on any northerly adjustment. I think those that are along and north of Rt50 should stay all snow with this one with realistically the zone north of Fairfax/Northern Prince William/Charles counties probably maintaining most, if not all snow. Would need this storm to cut further north to threaten those zones.
 

Best accums will be within the 7H and 85H FGEN areas with the northern periphery seeing best ratios to offset the “lighter” precip potential. 85H FGEN will have slightly lower ratios, but more precip. This is a good dual maxima setup wherever this sets up. Jury still out, but I still think this ends up a Central VA on northward storm. Ensembles have been pretty insistent on that. GFS waffling on location should be a major red flag in terms of forecasting. Until other models follow suit and/or GFS becomes steadily locked in for multiple days, I don’t see its 12z representation being the final solution.   

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