Alert archive / Georgia / Mesoscale Discussions in 2017
Mesoscale Discussion 441
The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2017, 11:38 AM EDT for Leon County, Florida; 58 counties in Georgia; Allendale County, Hampton County, South Carolina. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2017, 11:38 AM EDT (15:38 UTC)
- Expired
- Apr 5, 2017, 1:15 PM EDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 61 counties
Leon County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Bleckley County, GA, Brooks County, GA, Bulloch County, GA, Burke County, GA, Calhoun County, GA, Candler County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Grady County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Long County, GA, Lowndes County, GA, McDuffie County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Pierce County, GA, Pulaski County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Washington County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA, Allendale County, SC, Hampton County, SC
The radar
The Robins AFB radar (KJGX), 98 km from the middle of the area, began a volume at 15:37 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 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, 3.6 hours before the alert went out and 185 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
- 1335 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 8.2
The text
As transmitted.
085 ACUS11 KWNS 051539 SWOMCD SPC MCD 051538 SCZ000-GAZ000-FLZ000-051715- Mesoscale Discussion 0441 NWS Storm Prediction Center Norman OK 1038 AM CDT Wed Apr 05 2017 Areas affected...FL Panhandle...GA...Southwest SC Concerning...Severe potential...Watch likely Valid 051538Z - 051715Z Probability of Watch Issuance...95 percent SUMMARY...Tornado Watch will be issued by 17z to address increasing severe threat from the eastern FL Panhandle into SC. DISCUSSION...Boundary-layer cu field is beginning to deepen from the eastern FL Panhandle into southeast GA as surface temperatures rise to near 80F. Latest high-res Vis imagery depicts clustering/towering CU along a corridor from near MAI to near VDI. Substantial breaks in cloud cover suggest additional heating can be expected and thunderstorms will likely evolve over the next few hours. Given the strength of the wind fields and rising instability there is increasing concern for discrete supercell formation by early afternoon. Environmental parameters appear favorable for a few strong tornadoes across this region, in addition to large hail and damaging winds. Tornado watch will be issued for parts of this area by 17z. ..Darrow/Hart.. 04/05/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CHS...CAE...JAX...FFC...TAE... LAT...LON 31318496 33498250 32908093 31498180 30278426 31318496
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 12:54 AM EDT | Mesoscale Discussion | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington | 2 hr |
| Apr 5, 2:37 AM EDT | Severe Thunderstorm Watch | SPC | Holmes, Jackson | 6 hr |
| Apr 5, 4:41 AM EDT | Mesoscale Discussion | SPC | Holmes, Jackson | 2 hr |
| Apr 5, 7:54 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more | 8 hr |
| Apr 5, 12:54 PM EDT | Tornado Watch | SPC | Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more | 10 hr |
| Apr 5, 3:12 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Jackson, Washington | 93 min |
| Apr 5, 4:29 PM EDT | Mesoscale Discussion | SPC | Escambia, Santa Rosa | 3 hr |
| Apr 5, 7:15 AM EDT | Mesoscale Discussion | SPC | Calhoun, Carroll, Chattahoochee, Clay, Clayton, Cobb and 26 more | 90 min |
| Apr 5, 10:25 AM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Burke, Butts and 45 more | 95 min |
| Apr 5, 10:43 AM EDT | Mesoscale Discussion | SPC | Baldwin, Ben Hill, Bibb, Bleckley, Bulloch, Burke and 69 more | 2 hr |
| Apr 5, 2:02 PM EDT | Mesoscale Discussion | SPC | Dade, Walker | 2 hr |
| Apr 5, 2:50 PM EDT | Tornado Watch | SPC | Bartow, Carroll, Catoosa, Chattooga, Cherokee, Clayton and 26 more | 8 hr |
| Apr 5, 4:51 PM EDT | Mesoscale Discussion | SPC | Bartow, Carroll, Catoosa, Chattooga, Dade, Douglas and 10 more | 84 min |
| Apr 5, 6:29 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Berrien, Brantley, Brooks and 22 more | 61 min |
| Apr 5, 7:57 PM EDT | Mesoscale Discussion | SPC | Barrow, Bartow, Butts, Carroll, Catoosa, Chattahoochee and 46 more | 48 min |
| Apr 5, 2:02 PM EDT | Mesoscale Discussion | SPC | Darlington, Dillon, Florence, Lee, Marion, Williamsburg | 58 min |
| Apr 5, 2:45 PM EDT | Tornado Watch | SPC | Darlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more | 5 hr |
| Apr 5, 4:23 PM EDT | Mesoscale Discussion | SPC | Berkeley, Darlington, Dillon, Florence, Georgetown, Horry and 2 more | 97 min |
Nearby
Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in South Carolina, 2017Mesoscale Discussions in Florida, 2017Every mesoscale discussion in 2017
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.