Alert archive / Georgia / Mesoscale Discussions in 2016

Mesoscale Discussion 341

April 7, 2016Barbour County, Pike County, Russell County, Alabama; 7 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2016, 12:17 AM CDT for Barbour County, Pike County, Russell County, Alabama; 7 counties in Georgia. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2016, 12:17 AM CDT (05:17 UTC)
Expired: Apr 7, 2016, 1:15 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Barbour County, AL, Pike County, AL, Russell County, AL, Chattahoochee County, GA, Marion County, GA, Muscogee County, GA, Quitman County, GA, Schley County, GA, Stewart County, GA, Webster County, GA

The radar

The Ft Rucker radar (KEOX), 70 km from the middle of the area, began a volume at 05:16 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 5.3 hours before the alert went out and 160 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: 6 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1454 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 418 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

621 
ACUS11 KWNS 070517
SWOMCD
SPC MCD 070517 
GAZ000-ALZ000-070615-

MESOSCALE DISCUSSION 0341
NWS STORM PREDICTION CENTER NORMAN OK
1217 AM CDT THU APR 07 2016

AREAS AFFECTED...SERN AL / SWRN GA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 070517Z - 070615Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...A SUPERCELL TORNADO RISK MAY CONTINUE FOR THE NEXT HOUR OR
TWO BEFORE STORMS MOVE E OF THE THETA-E AXIS LOCATED NEAR THE AL/GA
BORDER.

DISCUSSION...RADAR IMAGERY FROM KMXX SHOWS A CLUSTER OF SUPERCELLS
ORIENTED IN A SW-NE BAND ACROSS SERN AL WITH A CONTINUOUS BAND OF
STORMS LOCATED FARTHER NE OVER W-CNTRL GA.  THE AIRMASS OVER SERN AL
AND NEAR THE AL/GA BORDER REGION IS CHARACTERIZED BY LOWER 60S TEMPS
AND DEWPOINTS AROUND 60 DEG F.  FARTHER E INTO SWRN AND CNTRL
GA...SLIGHTLY LESS-MOIST AIR WITH DEWPOINTS IN THE UPPER 50S IS
CURRENTLY OBSERVED AS OF 05Z.  RELATIVELY BACKED SSWLY SURFACE WINDS
SURMOUNTED BY STRONG WLY FLOW /PER KMXX VAD DATA/ INCREASING WITH
HEIGHT IS SUPPORTIVE OF LOW-LEVEL MESOCYCLONES DESPITE ONLY WEAK
BUOYANCY.  AS ADDITIONAL CONGEALING OF STORM COLD POOLS OCCURS
COINCIDENT WITH STORMS MOVING E OF A THETA-E AXIS...THE WEAK
SUPERCELL TORNADO RISK WILL PROBABLY DWINDLE OVER THE NEXT HOUR OR
TWO.  IN THE MEANTIME...AN ISOLD RISK FOR LOCALLY DAMAGING WINDS
AND/OR A BRIEF WEAK TORNADO MAY ACCOMPANY ANY STRONGER MESOCYCLONE.

..SMITH/EDWARDS.. 04/07/2016

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

ATTN...WFO...FFC...TAE...BMX...

LAT...LON   31818602 32628503 32578451 32158421 31708491 31628542
            31818602

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 7:59 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Calhoun, Chambers and 21 more	2 hr

Nearby

Mesoscale Discussions in Georgia, 2016 Mesoscale Discussions in Alabama, 2016 Every mesoscale discussion in 2016

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.