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Central PA and the fringes - Feb. 2014 Part IV


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Hi everyone,

 

Wanted to let you know I'm one of the storm mods for here. We've done pretty well so far but from here out, please keep sniping at each other, "OMG that's awesome" stuff, and (sorry) NeffsvilleWx Jr. congrats to the banter thread. We want to keep this a storm talk thread. 

 

Thanks!

 

Now back to the storm. 

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I tried to post this 3 times reminds me of the marcus days one more time cosgrove update

About a half million in the Dixie states without power. The storm is a bit stronger than forecast, and numerical models suggest a move slightly to the left of earlier forecast. Transition to rain will likely get as far as 50 miles north and west of Interstate 95. Big cities (Washington DC up to Portland ME) will likely see 4 - 8" accumulation with period of rain/sleet in the middle. Worst of this snow event along and maybe 75-100 miles to the east of the spine of the Appalachian Mountains. Those communities could see 12" to 18" with spikes to 24" in selected locations.

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Nobody's really mentioned it, but I've been wondering. Are the dynamics good enough back into Central PA for thundersnow.

 

Maybe. There will be some significant 700 mb frontogenesis, though more probably farther east towards Philly. The 12z NAM shows some negative EPV values due to the plume of moist oceanic air, though again, this is mostly in the western and northwestern Philly exurbs.

 

It is interesting to see a small layer from 700-750 mb of 7 C/km lapse rates in the 12z NAM forecast sounding for UNV, around 9z Thursday. This is the same time we see the greatest frontogenesis values in that cold conveyer belt feature.

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 Our Spartanburg,SC location is closed. Going to be ugly down there! :axe: 

BULLETIN - EAS ACTIVATION REQUESTED
CIVIL EMERGENCY MESSAGE
SOUTH CAROLINA EMERGENCY MANAGEMENT AGENCY
RELAYED BY NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1030 AM EST WED FEB 12 2014

THE FOLLOWING MESSAGE IS TRANSMITTED AT THE REQUEST OF THE SOUTH
CAROLINA EMERGENCY MANAGEMENT AGENCY COLUMBIA SOUTH CAROLINA.

A STATE OF EMERGENCY IS IN EFFECT. THE NATIONAL WEATHER SERVICE
HAS ISSUED SEVERE WINTER WEATHER ALERTS FOR MOST OF SOUTH
CAROLINA...PREDICTING SNOW...SLEET AND FREEZING RAIN. POWER
OUTAGES AND DANGEROUS ROAD CONDITIONS ARE LIKELY. MONITOR LOCAL
MEDIA FOR CHANGES IN CONDITIONS. SOUTH CAROLINA DEPARTMENT OF
PUBLIC SAFETY AND THE DEPARTMENT OF TRANSPORTATION URGE MOTORISTS
TO STAY OFF THE ROADWAYS. IN THE EVENT OF AN EMERGENCY DIAL 9 1 1.
FOR THE STATUS OF GOVERNMENT OFFICES STATEWIDE VISIT SCEMD.ORG.

$$






--------------------------------------------------------------------------------


Winter Storm Warning
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1217 PM EST WED FEB 12 2014

...MAJOR WINTER STORM TO SEVERELY IMPACT THE REGION TODAY THROUGH
THURSDAY...

.A LOW PRESSURE SYSTEM DEVELOPING FROM THE GULF OF MEXICO TO THE
SOUTHEAST COASTAL WATERS WILL COMBINE WITH AN APPROACHING STRONG
UPPER LEVEL DISTURBANCE TODAY THROUGH TONIGHT TO CREATE
WIDESPREAD HEAVY WINTRY PRECIPITATION ACROSS THE WESTERN
CAROLINAS AND NORTHEAST GEORGIA. PRECIPITATION WILL OVERSPREAD
THE REGION FROM THE SOUTH THIS MORNING...THEN BECOME HEAVIER
THROUGH THE AFTERNOON AND EVENING HOURS. WIDESPREAD HEAVY
SNOWFALL IS EXPECTED...WITH HEAVY SLEET AND FREEZING RAIN
DEVELOPING OVER THE LOWER PIEDMONT. THE PRECIPITATION WILL END
FROM THE WEST THURSDAY MORNING AS A FINAL ROUND OF SNOW SHOWERS...
POSSIBLY LINGERING INTO EARLY THURSDAY AFTERNOON EAST OF
INTERSTATE 77.

GAZ010-017-018-026-028-SCZ001>010-130200-
/O.CON.KGSP.WS.W.0005.000000T0000Z-140213T2300Z/
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-OCONEE MOUNTAINS-
PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-GREATER OCONEE-
GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG-CHEROKEE-YORK-
ANDERSON-
INCLUDING THE CITIES OF...CLAYTON...CLARKESVILLE...TOCCOA...
HARTWELL...GREENVILLE...SPARTANBURG...GAFFNEY...ROCK HILL...
ANDERSON
1217 PM EST WED FEB 12 2014

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM EST
THURSDAY...

* LOCATIONS...NORTHEAST GEORGIA AND UPSTATE SOUTH CAROLINA.

* HAZARDS...HEAVY SNOW...MIXED WITH SLEET AT TIMES IN LOCATIONS
SOUTHEAST OF INTERSTATE 85...AND FREEZING RAIN FROM SOUTHERN
ANDERSON COUNTY INTO FRANKLIN AND HART COUNTIES.

* TIMING...SNOW WILL INTENSIFY THROUGH THE AFTERNOON AND EVENING
HOURS. SLEET MAY MIX IN AT TIMES TODAY THROUGH TONIGHT...
ESPECIALLY IN SOUTHEAST SECTIONS. THE SNOW WILL END FROM THE
WEST THURSDAY MORNING.

* ACCUMULATIONS...SNOW ACCUMULATION OF 6 TO 10 INCHES...ALONG WITH
AROUND A TRACE OF ICE. ICE ACCUMULATIONS COULD REACH ONE TENTH
INCH OR GREATER FROM SOUTHERN ANDERSON COUNTY IN SOUTH CAROLINA
THROUGH FRANKLIN AND HART COUNTIES IN GEORGIA.

 

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the NAM CIPS analogs argue that this may still trend west further.  The list is pretty impressive. 

of the top 15 some notable central PA hits show up

 

top analog is  3-3-1994

also showing up

1-13-96

3-14-93 (yea I know)

1-4-2003

3-14-1980

2-7-1983

1-23-1987

1-25-2000

1-4-1994

1-13-1996

 

a few like feb 12 2006 were misses to our southeast but by far most of the analogs in the list today got good snows at least west of MDT and many got it into UNV and a few points west.  This argues to me that if there is a shift to be had at the last minute watch for the ccb to end up further northwest then guidance has it right now.  The mean and median snowfall for all the analogs is below. 

 

post-2304-0-57331100-1392228264_thumb.pnpost-2304-0-63881400-1392228257_thumb.pn

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I tried to post this 3 times reminds me of the marcus days one more time cosgrove update

About a half million in the Dixie states without power. The storm is a bit stronger than forecast, and numerical models suggest a move slightly to the left of earlier forecast. Transition to rain will likely get as far as 50 miles north and west of Interstate 95. Big cities (Washington DC up to Portland ME) will likely see 4 - 8" accumulation with period of rain/sleet in the middle. Worst of this snow event along and maybe 75-100 miles to the east of the spine of the Appalachian Mountains. Those communities could see 12" to 18" with spikes to 24" in selected locations.

Sorry for my ignorance, but who is Cosgrove?

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