Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 1583
The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2012, 12:39 PM CDT for 13 counties in Alabama; 38 counties in Florida; 111 counties in Georgia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 2012, 12:39 PM CDT (17:39 UTC)
- Expired
- Jul 25, 2012, 3:15 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 162 counties
Barbour County, AL, Bullock County, AL, Chambers County, AL, Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Hernando County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Lake County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Wakulla County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Baldwin County, GA, Bartow County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Butts County, GA, Calhoun County, GA, Camden County, GA, Candler County, GA, Carroll County, GA, Charlton County, GA, Chattahoochee County, GA, Cherokee County, GA, Clay County, GA, Clayton County, GA, Clinch County, GA, Cobb County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Echols County, GA, Emanuel County, GA, Evans County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Grady County, GA, Gwinnett County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Irwin County, GA, Jasper County, GA, Jeff Davis County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Peach County, GA, Pierce County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Tattnall County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Ware County, GA, Washington County, GA, Wayne County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.7 hours before the alert went out and 73 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.
- Mixed-layer CAPE
- 2761 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 873 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
775
ACUS11 KWNS 251739
SWOMCD
SPC MCD 251739
FLZ000-GAZ000-ALZ000-252015-
MESOSCALE DISCUSSION 1583
NWS STORM PREDICTION CENTER NORMAN OK
1239 PM CDT WED JUL 25 2012
AREAS AFFECTED...MUCH OF GA...ERN AL...NRN FL PENINSULA...CNTRL/ERN
FL PANHANDLE
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 251739Z - 252015Z
PROBABILITY OF WATCH ISSUANCE...5 PERCENT
SUMMARY...PULSE-TYPE STORMS MAY POSE A LOCALIZED SVR THREAT THROUGH
THE AFTERNOON. GIVEN THE DISORGANIZED NATURE OF THE CONVECTION...AND
THE SPORADIC NATURE OF ANY SVR STORMS...A WW IS NOT NEEDED.
DISCUSSION...AMIDST A MOIST AIR MASS CHARACTERIZED BY PW OF
1.75-2.00 INCHES PER GPS DATA...STRONG DIURNAL HEATING WILL CONTINUE
TO SUPPORT DESTABILIZATION. MODIFIED 12Z OBSERVED SOUNDINGS SUGGEST
THAT MLCAPE VALUES OF 2500-3500 J/KG WILL BE COMMON ACROSS THE AREA
THROUGH THE MID/LATE AFTERNOON.
WITH LITTLE/NO INHIBITION...CONVECTION WILL CONTINUE TO
DEVELOP/INTENSIFY FROM A VARIETY OF SOURCES:
/1/ DEVELOPING SEA BREEZE CONVERGENCE ZONES OVER INLAND AREAS
ADJACENT TO THE GULF/ATLANTIC WATERS...
/2/ A FIELD OF ENHANCED BOUNDARY-LAYER CUMULUS EXTENDING FROM FAR
SERN AL INTO SWRN/S-CNTRL GA AND PARTS OF THE FL PANHANDLE -- I.E.
ACROSS THE WARM SIDE OF A DIFFERENTIAL HEATING ZONE PERIPHERAL TO A
HIGH-CLOUD SHIELD ACCOMPANYING CLUSTERS OF CONVECTION OVER THE
OFFSHORE WATERS OF THE NERN GULF...
/3/ NEAR AND JUST SW OF A STALLED FRONT ARCING FROM SWRN NC INTO
NERN GA AND FAR SRN SC...AND
/4/ CUMULUS-CONVERGENCE LINES WITHIN THE UNSTABLE SECTOR SW OF THE
FRONT.
GIVEN THE AFOREMENTIONED DEGREE OF BUOYANCY...VIGOROUS
UPDRAFTS/DOWNDRAFTS ARE ANTICIPATED WITH CONVECTION THIS AFTERNOON.
SPORADIC INSTANCES OF DMGG WIND GUSTS AND MARGINALLY SVR HAIL WILL
BE POSSIBLE. HOWEVER...WITH AOB 15 KT OF FLOW EVIDENT BELOW THE 4-KM
AGL LEVEL PER AREA VWP DATA...WEAK LOW/MID-LEVEL FLOW WILL FOSTER A
PULSE/DISORGANIZED CONVECTIVE MODE. ANY INSTANCES OF SVR STORMS
SHOULD REMAIN ISOLATED/SPORADIC.
..COHEN/HART.. 07/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CHS...MLB...TBW...JAX...FFC...TAE...BMX...
LAT...LON 31618606 32508565 34288543 34448446 34038386 33348320
32818242 32128126 31758124 31168156 30398151 29508110
28928110 28398183 28198276 28838277 29498336 29698360
29848382 29928404 29848433 29678471 29558490 29578518
29748545 30148582 31098613 31618606SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 2:11 PM CDT | Mesoscale Discussion | SPC | Rabun, Towns, Union | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 2012Mesoscale Discussions in Alabama, 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.