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3/1 CAD Event Discussion


JoshM

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Glancing over data for those in SC, temps look to be slightly warm right South of a line from Lexington and Richland counties.  I don't buy it yet, and would expect temps just to verify a bit cooler.  Tricky around here tonight for sure.  Currently a quick glance is showing 33F or so.

 

CAE's current thinking:


MODEL FORECAST SOUNDINGS CONTINUE TO INDICATE A THREAT OF POSSIBLE  
FREEZING RAIN LATE TONIGHT INTO SUNDAY MORNING AS THE DRIER AIR  
ADVECTING IN FROM THE NORTH MAY BE ENOUGH TO SUPPORT SOME DIABATIC  
EVAPORATIVE COOLING WHICH COULD KEEP SURFACE TEMPS AT OR SLIGHTLY  
BELOW FREEZING FOR A PERIOD OF TIME. WHILE THE THREAT EXISTS...THE  
LIGHT NATURE OF THE PRECIPITATION AND UNCERTAINTY THAT THE TEMPS  
WILL ACTUALLY BE AT OR BELOW FREEZING LEAD TO LOW CONFIDENCE FOR ANY  
HEADLINES AND PREVENT ANYTHING MORE THAN A MENTION IN THE FORECAST  
AND WILL INCLUDE A BRIEF MENTION IN THE HWO PRODUCT. PRECIP SHOULD  
TURN TO ALL RAIN AFTER 15Z AS THE ATMOSPHERIC COLUMN SATURATES AND  
WARMS DUE TO WARM ADVECTION.  

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I'm kinda skeptical, I thought temperatures were supposed to stay well into the 40s today around CAE, we are warming rapidly toward the 50s, if not already there.

 

If precipitation makes it up, North Carolina and the far Northern Midlands of SC are in a much better spot.  It's currently 43 here on the Lake with winds from the North.

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If you look at mossiac SE radar, youll see a shortwave or barely noticeable impulse rotating/arching in sw GA given off the surface reflection up toward Savannah and central GA. This surface reflection is weak, but trending a little more heavier and building slightly back west. That is what will be assist with upgliding late tonight/Sunday in the Carolinas along with return flow on backside of HP as it slides ots.

 

southeast_loop.gif

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If I read the zone numbers right, GSP is going to put out a Freezing Rain Advisory for the entire area except the extreme northern counties where Winter Wx Advisory is going.

 

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...FREEZING RAIN ADVISORY FROM MIDNIGHT TONIGHT TO NOON EST
     SUNDAY FOR GAZ010-017.
NC...FREEZING RAIN ADVISORY FROM MIDNIGHT TONIGHT TO NOON EST
     SUNDAY FOR NCZ048-051>053-058-059-062>065-068>072-082-
     507>510.
     WINTER WEATHER ADVISORY FROM 3 AM TO 5 PM EST SUNDAY FOR
     NCZ033-035>037-049-050-056-057-501>506.
SC...FREEZING RAIN ADVISORY FROM MIDNIGHT TONIGHT TO NOON EST
     SUNDAY FOR SCZ001>003-006>009-012>014.
 

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Temps may be a little warmer than forecast today around here. It's mostly sunny and temp is 38 and we were only suppose to reach upper 30s to 40. Mabe the cold is still trying to come in? It's very windy also.

Not long after i posted that skies cleared and the temps soared and the temp here is 48.  In a rush trying to catch up, What I failed to look at  was the models were actually showing skies clearing/at worst partly sunny for most of the day. Far cry from what I wrongly assumed was going to be a cloudy day. That's a killer right there as late feb/early march sun can do some real damage. Cloud or clear though, The strong sun this time of year is one of the reasons why we don't normally see freezing rain events this late in the season. But If you put the exact same setup/features in january and temps would be quite cold all the way down this way. 1044mb high in the mid atlantic is actually quite impressive and doesn't happen too often. It's a shame it's waisted so late in the year and we didn't get it back in december or jan.

 

 

all that said, still believe a modest freezing rain event will unfold for north carolina with lesser amounts down into sc...mainly because it takes longer to cool off and much of the precip will have fallen by the time temps reach freezing. (assuming there is enough precip to get the job done of course). I really like gsp's advisory area..pretty much fits exactly where/what i was thinking. .

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The 18z NAM stays consistent with a high-end advisory event for the northern Piedmont. Maybe even a low-end warning event towards the border. I'd say Freezing Rain Advisories for most of the NC Piedmont and upstate SC are a necessity at this point.

GSP saying moisture looking more robust and earlier tonight! Don't see an issue here with temps currently 45, bet we don't get lower than 34
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...WINTER WEATHER ADVISORY LATE TONIGHT INTO SUNDAY...

.COLD HIGH PRESSURE WILL WEDGE SOUTH ALONG THE EASTERN SLOPES OF
THE APPALACHIANS TONIGHT AND PERSIST INTO SUNDAY. AN UPPER LEVEL
DISTURBANCE WILL COMBINE WITH MOISTURE FROM THE EASTERLY FLOW TO
RESULT IN A WINTRY MIXTURE LATE TONIGHT INTO SUNDAY.

NCZ003>006-019-020-VAZ022>024-032>035-043>047-058-059-010430-
/O.NEW.KRNK.WW.Y.0017.150301T0900Z-150302T0000Z/
SURRY-STOKES-ROCKINGHAM-CASWELL-WILKES-YADKIN-ROANOKE-BOTETOURT-
ROCKBRIDGE-PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-
CAMPBELL-APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-
INCLUDING THE CITIES OF...DOBSON...DANBURY...EDEN...YANCEYVILLE...
WILKESBORO...YADKINVILLE...ROANOKE...SALEM...FINCASTLE...
LEXINGTON...BUENA VISTA...STUART...ROCKY MOUNT...BEDFORD...
AMHERST...MARTINSVILLE...DANVILLE...LYNCHBURG...APPOMATTOX...
SOUTH BOSTON...KEYSVILLE
316 PM EST SAT FEB 28 2015

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 7 PM EST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A WINTER
WEATHER ADVISORY FOR SLEET AND FREEZING RAIN...WHICH IS IN EFFECT
FROM 4 AM TO 7 PM EST SUNDAY.

* LOCATIONS...ALONG AND EAST OF THE BLUE RIDGE MOUNTAINS.

* HAZARD TYPES...SLEET AND FREEZING RAIN. A BRIEF PERIOD OF
  SNOW MAY BE POSSIBLE DURING THE ONSET.

* ACCUMULATIONS...SNOW ACCUMULATION OF LESS THAN AN INCH...ALONG
  WITH UP TO TWO TENTH OF AN INCH OF ICE POSSIBLE. THE HIGHEST
  AMOUNTS OF ICING WILL OCCUR ALONG THE EASTERN FACING SLOPES OF
  THE BLUE RIDGE MOUNTAINS AND IN THE DEEPER COLDER VALLEYS.

* TIMING...LATE TONIGHT UNTIL 7 PM SUNDAY.

* IMPACTS...ROADS COULD BE SNOW AND ICE COVERED OVERNIGHT INTO
  SUNDAY AFTERNOON. TRAVELING WILL BE DANGEROUS DURING THIS TIME.


* WINDS...SOUTHEAST 5 MPH OR LESS.

* TEMPERATURES...IN THE MID 20S TO AROUND 30. TEMPERATURES
  WILL SLOWLY CLIMB INTO THE LOWER AND MID 30S SUNDAY AFTERNOON.



 

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NWS expands advisories into the Sandhills:

 

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A WINTER
WEATHER ADVISORY...WHICH IS IN EFFECT FROM 1 AM TO 10 AM EST
SUNDAY.

* LOCATIONS...SOUTH CENTRAL NORTH CAROLINA INCLUDING WADESBORO...
ROCKINGHAM... LAURINBURG... RAEFORD... LILLINGTON... AND
FAYETTEVILLE.

* HAZARD TYPES...MAINLY FREEZING RAIN AND FREEZING DRIZZLE.

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URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RALEIGH NC
349 PM EST SAT FEB 28 2015

...LIGHT WINTRY PRECIPITATION EXPECTED OVER PORTIONS OF CENTRAL NC
LATE TONIGHT THROUGH SUNDAY...

.THE COMBINATION OF COLD AIR IN PLACE AND MOISTURE MOVING IN FROM
THE SOUTH WILL BRING LIGHT WINTRY PRECIPITATION... PRIMARILY
FREEZING RAIN AND FREEZING DRIZZLE... TO MUCH OF THE PIEDMONT AND
PORTIONS OF THE SANDHILLS LATE TONIGHT THROUGH SUNDAY.

NCZ007-021>023-038-039-010500-
/O.NEW.KRAH.WW.Y.0011.150301T0900Z-150301T2300Z/
PERSON-FORSYTH-GUILFORD-ALAMANCE-DAVIDSON-RANDOLPH-
INCLUDING THE CITIES OF...ROXBORO...WINSTON-SALEM...GREENSBORO...
HIGH POINT...BURLINGTON...GRAHAM...LEXINGTON...THOMASVILLE...
ASHEBORO...ARCHDALE...TRINITY
349 PM EST SAT FEB 28 2015

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 6 PM EST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A WINTER
WEATHER ADVISORY...WHICH IS IN EFFECT FROM 4 AM TO 6 PM EST
SUNDAY.

* LOCATIONS...FOR THE FAR NORTHWEST PIEDMONT INCLUDING THE TRIAD
REGION... BURLINGTON... LEXINGTON... ASHEBORO... AND ROXBORO.

* HAZARD TYPES...MAINLY FREEZING RAIN.

* ACCUMULATIONS...ICE ACCUMULATION UP TO A TENTH OF AN INCH IS
EXPECTED.

* TIMING...VERY LATE TONIGHT THROUGH SUNDAY AFTERNOON.

* IMPACTS...A THIN COATING OF ICE ON ROADS AND SIDEWALKS WILL MAKE
TRAVEL TREACHEROUS THROUGH SUNDAY.

* WINDS...NORTH 5 MPH OR LESS.

* TEMPERATURES...IN THE MID 20S TO AROUND 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS...AND USE EXTRA CAUTION WHILE DRIVING.

&&

$

GIH

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Freezing Rain Advisory for less than .1".  Better get my generator ready and make a milk and bread run. :)

 

For some reason NAM hasn't been updated on Tropical Tidbits or Twisterdata so I can't see 2m temps or precip type arghh.  SREF totals looking a little more impressive than up to .1" with qpf mean of .25" through mid day tomorrow.

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