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Jan 22-23 East Coast Storm Discussion


Wow

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Its funny, the surface features are better located (more south) on NAM, RGEM and now GFS, but the sensible weather seems to have gone the other way. 2m freezing line covered all of Cleveland, Gaston, Mecklenburg counties at 12 hours of 18z GFS, now at 6 hours of 0z run, they are all above freezing. Could easily change later in the run, but all three 0z runs have been varying degrees warmer at surface.

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Gps only painting 24 to 30 inches in Rabun county and around highlands lol

Now we get to see how all that rain you've been getting pays off for you :)  Heck, I've gone from being on the outside looking in to maybe more than a dusting.  Got to love cad for frozen water in Ga.  It pays off in so many ways :)  Tony

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1037 PM EST THU JAN 21 2016

.SYNOPSIS...
A STRONG LOW PRESSURE SYSTEM WILL SPREAD WINTRY PRECIPITATION
ACROSS THE AREA TONIGHT AND TOMORROW. THE SYSTEM WILL EVENTUALLY
MOVE OFFSHORE ON SATURDAY WITH DRIER HIGH PRESSURE SPREADING BACK
OVER THE REGION IN ITS WAKE ON SUNDAY AND MONDAY.

&&

.NEAR TERM /THROUGH FRIDAY/...
AS OF 1015 PM...PRECIP IS OVERSPREADING THE AREA QUICKLY LATE THIS
EVENING. ATTM...PRECIP IS FALLING WITHIN THE RELATIVE HIGH WET BULB
AIR...THUS RAIN IS THE ONLY P-TYPE THAT IS FALLING. HOWEVER...THERE
IS A PRONOUNCED THERMAL/MOISTURE GRADIENT ACROSS THE FORECAST
AREA...WITH QUITE DRIER AND COOLER AIR IN PLACE ACROSS THE NW NC
PIEDMONT...WHERE WET BULB TEMPS ARE CURRENTLY IN THE UPPER 20S.
THEREFORE...WINTRY PRECIP...MOST LIKELY IN THE FORM OF SLEET...WILL
BECOME MORE COMMON AS IT SPREADS NORTHEAST.
THE 00Z NAM CONTINUED
ITS TREND OF BECOMING LESS AGGRESSIVE WITH PUSHING THE COOL/DRY AIR
SOUTHWEST ACROSS THE FORECAST AREA ON THE NOSE OF BARRIER JET
DEVELOPING AS A RESULT OF HYBRID COLD AIR DAMMING. THIS IS SOMEWHAT
DISCONCERTING CONCERNING THE FATE OF THE FORECAST...AS THE NAMS
SURFACE THERMO PROFILES WOULD SUGGEST THAT AT LEAST THE SOUTHERN
TIER OF WARNED ZONES ACROSS THE UPSTATE AND NE GEORGIA WOULD SEE
MAINLY A COLD RAIN...
AND CONVENTIONAL WISDOM DICTATES THAT THE NAM/S
HIGHER RESOLUTION WILL DEPICT THE CAD MORE REALISTICALLY.
NEVERTHELESS...THERE IS ENOUGH OF A SIGNAL IN OTHER OBJECTIVE
GUIDANCE...AND IN ENSEMBLE GUIDANCE TO STAY THE COURSE WITH THE
CURRENT PRODUCTS.


ONE AREA WHERE OBSERVATIONAL TRENDS ARE NOT GOING IN THE FORECAST/S
FAVOR IS ACROSS THE SOUTHWEST VALLEYS OF NORTH CAROLINA...WHERE THE
AIR HAS ALREADY SATURATED...AND WET BULB TEMPS ARE IN THE MID-30S.
THIS PROBABLY ISN/T GOING TO CHANGE MUCH OVERNIGHT...AND IN
FACT...THOSE AREAS...WHICH ARE USUALLY SHELTERED FROM THE EFFECTS OF
CAD...MAY WELL BEGIN TO WARM TOWARD DAYBREAK AS THE WARM ADVECTION
INCREASES. AGAIN...WITH PRECIP JUST NOW STARTING...IT WOULD BE
INSANE TO MAKE RADICAL CHANGES TO THE WARNING PRODUCTS...BUT WOULD
NOT BE SURPRISED IF LOCATIONS SUCH AS FRANKLIN...BRYSON
CITY/CHEROKEE...AND ROBBINSVILLE SEE MOSTLY A COLD RAIN UNTIL FRIDAY
EVENING.
BASED UPON CURRENT TRENDS...OVERNIGHT SNOW AND SLEET TOTALS
WERE LOWERED A BIT ACROSS MUCH OF THE AREA...PARTICULARLY ALONG THE
I-85 CORRIDOR...WHERE 1 TO 2 INCHES WILL BE POSSIBLE BY DAYBREAK
FROM THE GREENVILLE AREA EAST. 2 TO 4 STILL LOOKS POSSIBLE OVER THE
I-40 CORRIDOR...AND GENERALLY 4 TO 6 ACROSS THE MTNS...WITH LOCALLY
HIGHER AMOUNTS... EXCEPT OVER THE FAR WRN VALLEYS OF GRAHAM AND
SWAIN WHERE WARMER TEMPS MAY LINGER.


FRIDAY...THE UPPER LOW MOVES INTO THE WRN CWFA BY LATE DAY. STRONG
DEEP LAYER Q-VECTOR CONVERGENCE MOVES IN...ALONG WITH STRONG UPPER
DIVERGENCE...LEADING TO WIDESPREAD STRONG DEEP LIFTING. A STRONG H85
JET MOVES IN AS WELL...KEEPING STRONG UPSLOPE FLOW AND ISENTROPIC
LIFT OVER THE AREA. THIS WILL ALSO BRING A VERY WARM AND RELATIVELY
DEEP WARM NOSE AS FAR NORTH AS THE I-85 CORRIDOR. THE WARM NOSE WILL
LEAD TO A CHANGE OVER TO FREEZING RAIN FOR THE I-85 CORRIDOR AND ERN
PIEDMONT OF THE UPSTATE. THE NON-MOUNTAIN PORTION OF THE UPPER
SAVANNAH RIVER VALLEY WILL BE TRICKY AS THEY WILL SEE WARMER TEMPS
THRU THE PERIOD. EVEN WITH THE STRONG BARRIER JET...THE WARM NOSE
WILL AFFECT THESE AREAS STRONGLY...AND THE NEARBY LAKES WILL KEEP
THE SFC TEMPS WARMER. HOWEVER...AS THE H85 JET MOVES EAST...THE WARM
NOSE WILL WEAKEN AND THE BARRIER JET WILL TAKE OVER BRINGING IN
COOLER TEMPS...ALLOWING PRECIP TO TRANSITION TO FREEZING RAIN. COULD
SEE UP TO A HALF INCH...POSSIBLY EVEN HIGHER...ALTHOUGH THAT WOULD
BE APPROACHING THE PHYSICAL LIMIT...ACROSS THE I-85 CORRIDOR AND ERN
UPSTATE PIEDMONT. THE UPPER SAVANNAH RIVER LOCATIONS WILL BE ON THE
BORDER OF A QUARTER INCH ACCUMS...BUT WILL ADD TO THE WARNING FOR
CONSISTENCY. THE LAKELANDS AND ELBERT COUNTY WILL NOT SEE MUCH
ICE...BUT WILL LIKELY SEE ENUF OF A MIX THAT AN ADVISORY IS
WARRANTED.

FOR THE I-40 CORRIDOR AND THE MOUNTAINS AND NC FOOTHILLS...A
DIFFERENT STORY DEVELOPS. THE WARM NOSE WILL BE NEARLY NON EXISTENT
ACROSS THE MTNS...BUT DOES MOVE INTO THE NC FOOTHILLS AND NW
PIEDMONT DURING THE AFTERNOON. EVEN OVER THESE LOCATIONS...THE WARM
NOSE IS NOT AS STRONG AS LOCATIONS FARTHER SOUTH. THEREFORE...THEY
WILL SEE MOSTLY SNOW IN THE MORNING WITH A CHANGE TO OR MIX WITH
SLEET FOR THE AFTERNOON. THE BLUE RIDGE AND ADJACENT MTNS WILL SEE
MOSTLY SNOW THROUGHOUT.
THE TN BORDER AREAS WILL BE THE TRICKY
LOCATIONS WHERE TEMPS COULD WARM FARTHER AWAY FROM THE COLD AND DRY
BARRIER JET AND DEEPER COLD AIR. THIS MAY LIMIT ACCUMS IN THOSE
LOCATIONS. THAT SAID...THIS ENTIRE AREA LOOKS TO REMAIN SOLIDLY IN
WARNING CRITERIA SNOW AND/OR SLEET. THE LOCATIONS NEAR THE TN BORDER
COULD SEE SOME MINIMAL ICE...WITH UP TO A QUARTER INCH ACCRETION
SOUTH OF I-40 FROM CATAWBA EAST. AGAIN SNOW AND SLEET ARE THE BIGGER
STORY WITH AMOUNTS RANGING FROM 4 INCHES IN SERN ROWAN COUNTY TO A
FOOT OR MORE ALONG THE BLUE RIDGE. AMOUNTS COULD EXCEED 10 INCHES
IN THE LOWER ELEVATIONS OF THE NC FOOTHILLS DOWN ACROSS THE SC AND
NE GA MTNS AND INTO THE NC VALLEYS AWAY FROM THE BLUE RIDGE.
LESSER
AMOUNTS ARE LIKELY IN THE LOWER VALLEYS OF GRAHAM AND WRN SWAIN
COUNTIES.

&&

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Have they explained why they are lol about the GFS as opposed to lol about the NAM?

no, just the insane totals for DC unrealistic to them.....  They want to see EURO to see if it has anything as crazy. They feel RGEM has a better handle on it.

 

EDIT: I just caught last few minutes of it, they was talking about up there. never mentioned down here

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