Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 225

March 2, 201212 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 9:36 PM EST for 12 counties in Georgia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Mar 2, 2012, 9:36 PM EST (02:36 UTC)
Expired
Mar 2, 2012, 10:30 PM EST
In force
54 min
Issued by
the Storm Prediction Center

Counties Baker County, GA, Calhoun County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Tift County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 90 km from the middle of the area, began a volume at 02:36 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.6 hours before the alert went out and 90 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, Tallahassee Rgnl, FL at 00:00Z on 2012-03-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 585 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2012-03-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 square meters per square second.1939587897Sfc1 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
585 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
549 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

092 
ACUS11 KWNS 030237
SWOMCD
SPC MCD 030236
GAZ000-FLZ000-ALZ000-030330-

MESOSCALE DISCUSSION 0225
NWS STORM PREDICTION CENTER NORMAN OK
0836 PM CST FRI MAR 02 2012

AREAS AFFECTED...SWRN GA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 030236Z - 030330Z

ISOLD DMGG WINDS AND PERHAPS A BRIEF TORNADO OR TWO ARE POSSIBLE THE
NEXT FEW HOURS ACROSS SWRN GA WITH STORMS ARISING OUT OF A LOW LEVEL
CONFLUENT BAND SITUATED FROM THE FL PANHANDLE INTO SWRN GA.  IF
SHORT TERM TRENDS SHOW A MARKED INCREASE IN STORM INTENSITY...THEN A
TORNADO WATCH MAY NEED TO BE CONSIDERED FOR THE AREA.

A MOIST MARITIME AND MARGINALLY UNSTABLE AIRMASS OVER THE NERN GULF
AND ADJACENT COASTAL LOWLANDS /SWRN GA/ WILL PROBABLY CONTINUE TO
SUPPORT SOME UPDRAFT ROTATION.  KEOX IMAGERY HAS SHOWN WEAK LOW
LEVEL ROTATION PERSISTING FOR THE PAST HOUR WITH 0-1 KM SRH 400-500
M2/S2 PER VAD WINDS.  IF/AS THESE STORMS CONTINUE TO PERSIST...THEY
WILL CONTINUE TO REALIZE A FAVORABLY MOIST FETCH OFF THE NERN GULF
THAT IS CHARACTERIZED BY DEWPOINTS RISING INTO THE UPPER 60S DEG F.
ALTHOUGH THE TLH 00Z RAOB FEATURED MODEST MID LEVEL LAPSE
RATES...MLCAPE NEAR 750 J/KG WITHIN AN ESSENTIALLY UNCAPPED
ENVIRONMENT MAY CONTINUE TO FAVOR STRONG-SEVERE UPDRAFT SUSTENANCE
FOR THE FORESEEABLE FUTURE.  AS SUCH...THERE IS A RISK FOR ISOLD
DMGG WINDS AND PERHAPS A BRIEF TORNADO OR TWO.

..SMITH.. 03/03/2012

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

ATTN...WFO...TAE...

LAT...LON   30928511 31248517 31748425 31678333 31078336 30858463
            30928511

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 2, 8:15 PM ESTMesoscale DiscussionSPCCatoosa, Dade, Fannin, Gilmer, Murray, Rabun and 4 more90 min
Mar 2, 8:18 PM ESTMesoscale DiscussionSPCDade57 min
Mar 2, 10:54 PM ESTTornado WatchSPCBanks, Barrow, Bartow, Butts, Carroll, Catoosa and 61 more6 hr
Mar 2, 11:07 PM ESTMesoscale DiscussionSPCCarroll, Clayton, Cobb, Coweta, DeKalb, Douglas and 13 more113 min
Mar 3, 12:40 AM ESTMesoscale DiscussionSPCBanks, Barrow, Bartow, Carroll, Cherokee, Clarke and 30 more95 min
Mar 3, 3:58 AM ESTMesoscale DiscussionSPCBurke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 6 more92 min
Mar 3, 4:39 AM ESTSevere Thunderstorm WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond4 hr
Mar 3, 5:47 AM ESTMesoscale DiscussionSPCBaker, Berrien, Brooks, Calhoun, Clay, Colquitt and 18 more58 min
Mar 3, 7:35 AM ESTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 49 more6 hr
Mar 3, 10:12 AM ESTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 24 more93 min
Mar 3, 12:45 PM ESTMesoscale DiscussionSPCBrantley, Brooks, Camden, Charlton, Clinch, Echols and 3 more60 min
Mar 3, 1:04 PM ESTTornado WatchSPCAtkinson, Brantley, Brooks, Camden, Charlton, Clinch and 12 more5 hr
Mar 3, 4:30 PM ESTMesoscale DiscussionSPCCharlton90 min

Nearby

Mesoscale Discussions in Georgia, 2012Every 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.