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January 12-14, 2019 Storm Discussion STORM MODE


WxUSAF

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6 minutes ago, BTRWx's Thanks Giving said:

I'd guesstimate that the euro is tucking better.  Where's our subs?!

 

ecmwf_z500_mslp_us_fh48_trend.gif

That looks a lot closer to a storm that could gain some latitude off the coast but I’m not an expert. Shift that low a little closer to the coast and we might be in good shape.

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1 minute ago, nj2va said:

It’s better for my backyard hence my optimism with the run. Every man for themselves, heh. 

We always seem to get 1 set of runs with an overall "step back". Dec 9 2017 had it at the 0z runs as well. Seems to not effect much, but the fact that the Euro took a step back from 18z and still shows borderline WSW snows is pretty great. We seem to be locked in for a good one. 

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1 minute ago, Cobalt said:

We always seem to get 1 set of runs with an overall "step back". Dec 9 2017 had it at the 0z runs as well. Seems to not effect much, but the fact that the Euro took a step back from 18z and still shows borderline WSW snows is pretty great. We seem to be locked in for a good one. 

Yep, we’re locked into a nice event...it’s better in my backyard from 12z which I liked seeing. As Bob says it’s let the chips fall time.  Happy to start posting obs soon. 

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31 minutes ago, snowdude said:

A little warmer this run with some rain pushing north. 

38994D23-6D2C-4E97-AA79-B7476B9C60D2.png

20A6A42E-C68F-452F-9E12-75835A8EC3AE.png

It seems like all the guidance took a step backwards at 0z... maybe I am just being pessimistic.. but that's what is looks like to me.

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Just now, LeesburgWx said:

We are sick SOBs. 3 am and doing NAM pbp... Models have consistently been showing a max strip like this somewhere just south of us. The NAM looks to now have moved that strip north closer to the VA/MD border and DC

Glad more than 1 person isn't asleep at this time. I mean, it's nowcasting time, and we're drooling over the NAM just before gametime. 

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We just got NAMd big time. Southern SW with a bit more amplitude and a the confluence is a bit weaker and lifts out faster. Spits out 6-12" around DC metro. Probably overdone but nice to see it improve heading into game time.

 

(Not a bad time for the newborn to wake up to eat)

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As for headlines, did upgrade the advisory to a warning for the
northern Shenandoah Valley and the Washington Metropolitan area.
Am concerned that east-west oriented banding may cause locally
higher amounts across these areas. Frontogenetical forcing
increases as the low passes by to the south late tonight into
Sunday morning, and looking at the 00z nam bufkit, did notice
the Eqivalent Potential Temperatures nearly neutral with height
for a period between 06 and 12z along with slightly negative EPV
and Frontogenetical forcing that lines up, suggesting that CSI
banding is possible. Elsewhere, left the headlines from the
previous forecast. Still looking at a most likely of 2-5 inches
across northern Maryland, the eastern Panhandle of West Virginia
and the Baltimore Metropolitan areas, with 4-7 inches
elsewhere. Do want to point out that there is still uncertainty
regarding the placement and location of any banding
precipitation and also with the track of the low. Any slight
change in either direction will have an impact on snowfall
totals. Having that been said, there will be impact from snow
across the entire CWA tonight into Sunday.
 

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Mount Holly keeping a WWA for now, but mentioned a possible upgrade in the AFD for tonight. Also noticed they have a bit more of a 'wide range' than usual for accumulations in the text forecast, owing to the possible tight gradient and uncertainty with the coastal enhancement across this area. Calling for 2-6" here and 3-7" around Easton. Less NE. Seems reasonable.

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