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Jan 22-23 East Coast Storm Discussion


Wow

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Lookout's mystery model is even further south on it's 18z run than it was for the 12z cycle. 

I really think FRAM needs to stick. That's the perfect name. As for what it's depicting, I mean a closed off low on the TX/LA border isn't the most believable thing ever but it sure does look nice for the SE!

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PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

551 PM EST TUE JAN 19 2016

VALID 00Z WED JAN 20 2016 - 00Z SAT JAN 23 2016

...CENTRAL PLAINS TO THE TN/SOUTHERN OH VALLEYS AND

CENTRAL/SOUTHERN APPALACHIANS...

A RATHER MOIST AND DYNAMIC SPLIT FLOW SYSTEM ARRIVING INTO THE PAC

NW/NRN CA ON TUES WILL REACH THE CENTRAL/SRN PLAINS LATE WED INTO

THURS MORNING. THE DIGGING UPPER DYNAMICS REACHING THE PLAINS WILL

BEGIN TO SHOW SIGNS OF PHASING... AS A MID TO UPPER CLOSED LOW

FORMS OVER KS WITH AN INVERTED SURFACE TROUGH EXTENDS FROM KS INTO

NE. EXPECT A BURST OF SNOW TO DEVELOP ALONG THIS SURFACE

CONVERGENCE AND ENHANCED VERTICAL LIFT FOR LOCALLY HEAVY

ACCUMULATIONS FROM CENTRAL KS INTO CENTRAL NE.

THEN ON THURS... UPPER STREAMS WILL TRULY BEGIN TO PHASE OVER THE

LOWER MS VALLEY AND LEAD TO A DEVELOPING WINTER STORM. THE MID TO

UPPER LOW AND VORTICITY WILL DIG SOUTH AND EAST TOWARD AR/NRN MS

TO ESTABLISH AN AMPLIFIED UPPER TROUGH OVER THE LOWER MS

VALLEY/CENTRAL GULF COAST STATES. THIS AMPLIFICATION WILL ALLOW

ABUNDANT GULF OF MEXICO AND SUBTROPICAL MOISTURE TO SPREAD

NORTHWARD... WITH INTERACTION DEVELOPING BETWEEN AREA OF LOW

PRESSURE AND OVERRUNING OF MOISTURE INTO MODIFIED ARCTIC AIR MASS.

THE RESULTANT WILL BE A WIDESPREAD AREA OF HEAVY SNOW AND LENGTHY

TRANSITION ZONE FROM SRN MO/NRN AR UP THE OH RIVER INTO KY/WV AND

INTO THE APPALACHIAN SPINE WHILE SPILLING OVER EAST OF THE MTNS

INTO SWRN VA/WEST CENTRAL NC.

MODEL AGREEMENT REMAINS VERY GOOD IN THE BIG PICTURE THROUGH DAY 3

AND THERE WAS LITTLE SPREAD BETWEEN THE HI RES GFS AND ECMWF MASS

FIELDS. HOW THE INTERNALS OF THE MODEL DEALS WITH SOME OF THE

DIFFERENCES MAY STILL LEAD TO SUBTLE POSITIONAL OR TIMING

DIFFERENCES COULD YIELD SOME IMPORTANT CHANGES IN THE UPCOMING

FORECAST.

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That 96 storm still stands as my favorite. Even over the bigger snows (like 2000 2 footer). That was 6" of sleet for Wake Forest. Roads were a mess for many days after that.  

 

Seems like a odd mix there, 96 was a non event here but the others listed are all decent to great snowstorms IMBY, currently the models are not hinting at anything close to 1980, and even 2010, 2002 seem like the models have to trend a fair bit further south to get snow totals like that in NC, especially MBY.

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So according to previous posts the models should be infused with good data tonight as the storm system has arrived correct?

 

I think so, yeah. Shortwave that will lead to our Friday storm arrived to CONUS today, so hopefully we get more data of the wave from upper-air soundings via weather balloons. However, I think it's worth posting someone's quote from the Mountains thread:

 

I think this is less of an issue that it used to be.  Satellite ingest is rather good now as satellite data has been upgraded over the years.  That being said, Euro is still superior at satellite ingest than others.  I'd say the model solution won't change much even after it has been sampled by the RAOB network.

 
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So according to previous posts the models should be infused with good data tonight as the storm system has arrived correct?

From what I read yes that should be the case but the most telling models will be tomorrows runs. And that's when we can all start trying to pinpoint where and what this storm is going to do. But don't get me wrong tonight's runs are very Important!

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So according to previous posts the models should be infused with good data tonight as the storm system has arrived correct?

Seriously, this has been answered almost 10+ times in the past 24 hours. But yes, yes, yes, yes. It's essentially being sampled overnight tonight, should be in 12z runs tomorrow at latest. 

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