Alert archive / Georgia / Mesoscale Discussions in 2017
Mesoscale Discussion 151
The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 5:25 PM EST for 29 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 7, 2017, 5:25 PM EST (22:25 UTC)
- Expired
- Feb 7, 2017, 7:30 PM EST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 29 counties
Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Crawford County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Glascock County, GA, Hancock County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Macon County, GA, Monroe County, GA, Peach County, GA, Pulaski County, GA, Putnam County, GA, Taliaferro County, GA, Treutlen County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilkinson County, GA
The radar
The Robins AFB radar (KJGX), 11 km from the middle of the area, began a volume at 22:29 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 12:00Z, 10.4 hours before the alert went out and 130 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1498 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 172 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
766
ACUS11 KWNS 072226
SWOMCD
SPC MCD 072225
GAZ000-080030-
Mesoscale Discussion 0151
NWS Storm Prediction Center Norman OK
0425 PM CST Tue Feb 07 2017
Areas affected...Portions of GA
Concerning...Severe potential...Watch unlikely
Valid 072225Z - 080030Z
Probability of Watch Issuance...20 percent
SUMMARY...Convection spreading across portions of GA into the early
evening hours could produce locally damaging wind gusts. Watch
issuance is not anticipated.
DISCUSSION...Loosely organized clusters of convection will continue
spreading east-northeastward across portions of GA during the next
few hours. While convective inflow should remain marginally
unstable, with ample cloud coverage stunting surface heating and
dewpoints only holding in the middle 50s, buoyancy/vertical shear
will be sufficient for a risk for locally intense convection to
continue spreading downstream. This activity would be enhanced by
local storm-scale circulations/MCVs noted in recent radar data. With
around 35 kt of flow in the 1-2-km above-ground layer per JGX VAD
wind profile, convective momentum transport could support locally
damaging wind gusts -- aided by sub-cloud evaporative
cooling/downdraft enhancements in the only modestly moist
environment. Weak instability, and veered flow ahead of the
convection, will limit the overall severe risk.
..Cohen/Hart.. 02/07/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CHS...CAE...FFC...
LAT...LON 32128402 32828427 33308413 33648294 33338230 32778209
32068268 32128402SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 7, 3:44 PM EST | Mesoscale Discussion | SPC | Baker, Calhoun, Clay, Colquitt, Decatur, Dougherty and 7 more | 91 min |
| Feb 7, 5:33 PM EST | Severe Thunderstorm Watch | SPC | Baker, Ben Hill, Berrien, Brooks, Calhoun, Colquitt and 17 more | 4 hr |
| Feb 7, 6:24 PM EST | Mesoscale Discussion | SPC | Baker, Brooks, Colquitt, Cook, Decatur, Grady and 6 more | 96 min |
| Feb 7, 6:58 PM EST | Mesoscale Discussion | SPC | Brantley, Camden, Charlton, Glynn, Pierce, Ware and 1 more | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 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.