Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 766

May 9, 20126 counties in Georgia; Beaufort County, Berkeley County, Charleston County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 9, 2012, 4:54 PM EDT for 6 counties in Georgia; Beaufort County, Berkeley County, Charleston County, South Carolina. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 9, 2012, 4:54 PM EDT (20:54 UTC)
Expired: May 9, 2012, 6:30 PM EDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Bryan County, GA, Chatham County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Wayne County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 51 km from the middle of the area, began a volume at 20:56 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, 8.9 hours before the alert went out and 119 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 484 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 50 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.

345 
ACUS11 KWNS 092054
SWOMCD
SPC MCD 092054 
SCZ000-GAZ000-092230-

MESOSCALE DISCUSSION 0766
NWS STORM PREDICTION CENTER NORMAN OK
0354 PM CDT WED MAY 09 2012

AREAS AFFECTED...ERN SC/SERN GA

CONCERNING...SEVERE THUNDERSTORM WATCH 269...

VALID 092054Z - 092230Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 269
CONTINUES.

SUMMARY...LIMITED SEVERE THREAT CONTINUES AS STORMS CONTINUE EWD
ACROSS THE WW.

DISCUSSION...LATEST RADAR LOOP SHOWS AN ARCING BAND OF STORMS WHICH
HAS REACHED THE SC COASTAL VICINITY...WITH EMBEDDED STRONGER CORES
EVIDENT WITHIN THE BAND.  WHILE OTHER STORMS HAVE DEVELOPED BEHIND
THIS INITIAL BAND OF CONVECTION...SEVERE POTENTIAL IS MAINLY
CONFINED TO THE INITIAL/MORE-ORGANIZED LINE.  AS THIS BAND OF STORMS
MOVES PROGRESSIVELY OFFSHORE...MORE WIDESPREAD THREAT FOR LOCALLY
DAMAGING WINDS AND MARGINAL HAIL WILL SUBSIDE.

..GOSS.. 05/09/2012

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

ATTN...WFO...ILM...CHS...JAX...

LAT...LON   31438197 31908194 32558063 33667968 33267920 31188130
            31438197

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 11:32 AM EDT	Mesoscale Discussion	SPC	Burke, Richmond	88 min
May 9, 12:59 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 49 more	2 hr
May 9, 2:00 PM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 4 more	5 hr
May 9, 6:01 PM EDT	Mesoscale Discussion	SPC	Atkinson, Bacon, Brantley, Brooks, Camden, Charlton and 6 more	89 min
May 9, 7:04 PM EDT	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham, Liberty, Long, McIntosh	26 min

Nearby

Mesoscale Discussions in Georgia, 2012 Mesoscale Discussions in South Carolina, 2012 Every mesoscale discussion in 2012

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.