Alert archive / Georgia / Mesoscale Discussions in 2007
Mesoscale Discussion 2001
The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2007, 4:37 PM CDT for 20 counties in Alabama; 15 counties in Florida; 43 counties in Georgia. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Sep 21, 2007, 4:37 PM CDT (21:37 UTC)
- Expired
- Sep 21, 2007, 5:30 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 78 counties
Barbour County, AL, Bullock County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Bleckley County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Harris County, GA, Houston County, GA, Irwin County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Miller County, GA, Mitchell County, GA, Muscogee County, GA, Peach County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.6 hours before the alert went out and 151 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
- 399 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 212137 SWOMCD SPC MCD 212137 GAZ000-FLZ000-ALZ000-212230- MESOSCALE DISCUSSION 2001 NWS STORM PREDICTION CENTER NORMAN OK 0437 PM CDT FRI SEP 21 2007 AREAS AFFECTED...FL PANHANDLE...SRN AL AND SWRN GA CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON VALID 212137Z - 212230Z ENVIRONMENTAL CONDITIONS HAVE BECOME FAVORABLE FOR SEVERE STORMS AND A WATCH ISSUANCE WILL BE COORDINATED BETWEEN THE SPC AND THE AFFECTED LOCAL NATIONAL WEATHER SERVICE OFFICES SHORTLY. PORTIONS OF SWRN GA..SRN AL AND THE FL PANHANDLE ARE BEING MONITORED FOR A POSSIBLE WW. TROPICAL DEPRESSION IN THE EXTREME NRN GULF WSW OF PFN IS RESULTING IN STRONG LOW LEVEL SHEAR ACROSS THE AREA. CONVECTION HAS RECENTLY STRENGTHENED ON A CONFLUENT BAND LOCATED IN GA FROM NEAR CSG TO 40 S OF MCN AND ALSO ALONG A NEWLY DEVELOPED BAND IN THE FL PANHANDLE FROM NEAR CEW TO NEAR MAI. GIVEN THE RECENT INCREASE IN UPDRAFT STRENGTH...COMBINED WITH THE EXPECTED STRONG LOW/MID LEVEL SHEAR AND VERY MOIST BOUNDARY LAYER. ..IMY.. 09/21/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...TAE...BMX...MOB... 30278776 31578753 32528648 32948527 33018420 32628329 32108302 31078343 30138401 29768512
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 4:58 PM CDT | Tornado Watch | SPC | Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 11 more | 7 hr |
| Sep 20, 9:56 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 13 more | 94 min |
| Sep 20, 10:19 PM CDT | Tornado Watch | SPC | Alachua, Bradford, Columbia, Dixie, Gilchrist, Hamilton and 12 more | 7 hr |
| Sep 21, 1:35 AM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Columbia, Dixie, Franklin and 13 more | 115 min |
| Sep 21, 10:45 AM CDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gulf, Liberty, Wakulla and 1 more | 60 min |
Nearby
Mesoscale Discussions in Georgia, 2007Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Florida, 2007Every mesoscale discussion in 2007
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.