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The Big One - Forecast & Discussion


Wow

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Same thing done by RAH for the same reasons. It seems good in theory but it's just too difficult with all of the different disturbances and resultant ptype and geographical differences. You put out a 3 day winter storm warning and people feel compelled to close businesses or cancel school even though it isn't warranted.

Would there be any public benefit to saying "hey we have 2 winter systems within 48hrs and while there may be a window of lower impact between the 2, current uncertainty re: conditions, exact timing may yield warning criteria at any given point during this period therefore no unnecessary travel and winter emerg preparations are recommended".......This could help many politicians make a decision without risking their knecks which is really the elephant in the room re Atl etc. Those same business owners will gripe when stuck out in cold:)

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Euro thumps raleigh before bringing the freezing line into around Chapel Hill changing us to rain about 3/4 of the way through.

 

Possible, but still seems too amped to me. We shall see.

 

NWS Wakefield appears to agree with you.   Their discussion say anything frozen is washed away by rain from the Triangle of NC north and east by Thursday.

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850 line is squeezing in from the east on the 18z NAM vs. 12z run at 51 hours (vs. 57 on 12z). Good news, though, is that model appears to be picking up cold pool associated with upper level low, so 850s crash again at 57 hours.

What is that supposed to mean? They got warmer? Colder? What?

 

Burger: Please tell me that means colder towards I-95 in NC.

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Thickness and 850's would say that's not very likely. CLT is probably a raging sleet storm until hour 55 or so if you're taking the NAM verbatim. Much of what's along I95 would be a really cold rain or ZR. 

Actually soundings for charlotte are all snow through 48 hours. It looks like it might go to sleet or a mix of snow and sleet for just a couple of hours before going back to snow. Looks like anything west of charlotte stays snow.

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CHARLOTTE, NC

GREATEST SNOWFALLS IN A CALENDAR DAY 1878 2012

14.0 15-Feb 1902

12.1 7-Jan 1988

11.6 26-Feb 2004

11.0 29-Dec 1880

10.4 17-Dec 1930

10.4 2-Mar 1927

10.3 24-Mar 1983

10.0 18-Feb 1979

10.0 16-Jan 1965

10.0 2-Dec 1896

8.7 16-Feb 1969

GREATEST SNOWSTORM TOTALS 1878 2012

17.4 14-Feb 17-Feb 1902

13.3 1-Mar 2-Mar 1927

13.2 26-Feb 27-Feb 2004

15-Feb 17-Feb 1969

12.1 7-Jan 1988

11.8 29-Dec 30-Dec 1882

11.0 2-Dec 3-Dec 1896

11.0 29-Dec 1880

10.4 17-Dec 1930

10.3 24-Mar 1983

10.2 16-Jan 17-Jan 1965

 

If mixing can be held at bay, these records are in play. Especially the lower end. 

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URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BLACKSBURG VA
200 PM EST MON FEB 10 2014

...HIGH POTENTIAL FOR HEAVY SNOW WEDNESDAY INTO EARLY THURSDAY...

.A DEEP LOW PRESSURE SYSTEM DEVELOPING ALONG THE GULF COAST WILL
FORCE LARGE AMOUNTS OF MOISTURE NORTHWARD ALONG THE ATLANTIC
SEABOARD AND ACROSS THE APPALACHIAN CHAIN. COLD AIR ALREADY IN
PLACE DURING THAT TIME WILL CAUSE THIS PRECIPITATION TO FALL AS
SNOW. STRONG UPSLOPE FLOW INTO THE MOUNTAINS...IN ADDITION TO THE
POTENTIAL FOR HEAVY SNOW BANDS TO DEVELOP ACROSS THE AREA...WILL
LEAD TO THE POTENTIAL FOR 5 TO 8 INCHES SNOWFALL ACCUMULATIONS
ACROSS THE MOUNTAINS TO THE BLUE RIDGE...AND 6 TO LOCALLY 10
INCHES ACROSS THE NORTHWEST PIEDMONT OF NORTH CAROLINA.

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NAM looks even juicier on this run......crazy.  This is probably one of the most well represented CADs I've seen on a forecast map in a really long time.  Looks absolutely perfect for north Georgia and the SC upstate.  NAM has this storm really ripping.

925 to 950mb temps drop to as low as -6c in atlanta and -7c in gainesville and athens northeastward. And -8c in the upstate at 925mb by 48 hours! That's 21 in atlanta, 19 in gainesville and athens, and 17 in the upstate. You won't find many wedges that are colder than that. Incredible.

 

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925 to 950mb temps drop to as low as -6c in atlanta and -7c in gainesville and athens northeastward. And -8c in the upstate at 925mb by 48 hours! That's 21 in atlanta, 19 in gainesville and athens, and 17 in the upstate. You won't find many wedges that are colder than that. Incredible.

 

Haven't looked at the soundings yet, but this def. looks colder at those layers and 2m here, wouldn't you agree?

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