Alert archive / North Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 1663

July 29, 200628 counties in Georgia; 33 counties in North Carolina; 32 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2006, 1:52 PM EDT for 28 counties in Georgia; 33 counties in North Carolina; 32 counties in South Carolina. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Jul 29, 2006, 1:52 PM EDT (17:52 UTC)
Expired
Jul 29, 2006, 3:45 PM EDT
In force
113 min
Issued by
the Storm Prediction Center
All 93 counties

Baldwin County, GA, Barrow County, GA, Burke County, GA, Candler County, GA, Clarke County, GA, Columbia County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lincoln County, GA, McDuffie County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Putnam County, GA, Richmond County, GA, Screven County, GA, Taliaferro County, GA, Treutlen County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Alamance County, NC, Anson County, NC, Bladen County, NC, Cabarrus County, NC, Chatham County, NC, Columbus County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Greene County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Lenoir County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Pender County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Greenwood County, SC, Hampton County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 54 km from the middle of the area, began a volume at 17:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 5.9 hours before the alert went out and 170 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2006-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2219 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2006-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2219 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1061 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 291752
SWOMCD
SPC MCD 291752 
NCZ000-SCZ000-GAZ000-291945-

MESOSCALE DISCUSSION 1663
NWS STORM PREDICTION CENTER NORMAN OK
1252 PM CDT SAT JUL 29 2006

AREAS AFFECTED...EASTERN GA AND PIEDMONT/COASTAL PLAIN AREAS OF NC
AND SC

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 291752Z - 291945Z

POTENTIAL FOR ISOLATED DAMAGING WINDS/SOME LARGE HAIL IS EXPECTED TO
INCREASE OVER THE NEXT SEVERAL HOURS ACROSS EASTERN GA INTO THE
PIEDMONT/COASTAL PLAIN AREAS OF BOTH NC AND SC. ALTHOUGH NOT
CURRENTLY ANTICIPATED...WILL MONITOR FOR A POSSIBLE SEVERE
THUNDERSTORM WATCH.

WATER VAPOR/VISIBLE SATELLITE IMAGERY FEATURES WELL DEFINED MID
LEVEL CIRCULATION MOVING EASTWARD ACROSS THE NC/SC APPALACHIANS
EARLY THIS AFTERNOON. ON THE PERIPHERY OF THIS FEATURE...AMPLE
INSOLATION/TEMPERATURES WARMING INTO THE LOWER 90S AMIDST A
RELATIVELY MOIST AIRMASS IS LEADING TO A EROSION OF SURFACE BASED
CINH ACROSS EASTERN GA AND PIEDMONT/COASTAL PLAIN AREAS OF NC/SC
EARLY THIS AFTERNOON. SCATTERED TO NUMEROUS THUNDERSTORMS APPEAR
LIKELY TO DEVELOP OVER THE NEXT SEVERAL HOURS...ATTRIBUTABLE TO
DIFFERENTIAL HEATING/MID LEVEL IMPULSE ASSOCIATED ASCENT...IN
ADDITION TO THE COASTAL SEA BREEZE.

WSR-88D VWP FROM GREENVILLE-SPARTANBURG CAPTURES ENHANCED LOW TO MID
TROPOSPHERIC FLOW VIA THE MID LEVEL CIRCULATION...WITH 25-35 KT
WESTERLY WINDS EVIDENT BETWEEN 1-6 KM. THIS MODESTLY ENHANCED
VERTICAL SHEAR WILL LIKELY PROVIDE SOME ADDITIONAL
FOCUS/ORGANIZATION FOR STRONG TO SEVERE THUNDERSTORMS THIS AFTERNOON
AS THE MID LEVEL CIRCULATION SPREADS EASTWARD. THE STRONGEST STORMS
WILL BE CAPABLE OF DAMAGING DOWNBURSTS/SOME LARGE HAIL/LOCALLY HEAVY
RAINFALL.

..GUYER.. 07/29/2006

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MHX...RAH...ILM...CHS...CAE...GSP...FFC...

34098373 34088251 34988110 36087964 36177815 35777701
34547773 33937891 32898023 32288243 32748352

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 2:55 PM EDTMesoscale DiscussionSPCButts, Carroll, Clayton, Cobb, Coweta, Crawford and 20 more2 hr

Nearby

Mesoscale Discussions in North Carolina, 2006Mesoscale Discussions in South Carolina, 2006Mesoscale Discussions in Georgia, 2006Every mesoscale discussion in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.