Alert archive / Alabama / Mesoscale Discussions in 2021
Mesoscale Discussion 312
The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2021, 4:50 PM CDT for Coffee County, Dale County, Houston County, Alabama; Early County, Miller County, Seminole County, Georgia. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2021, 4:50 PM CDT (21:50 UTC)
- Expired
- Mar 31, 2021, 6:45 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 71
Counties Coffee County, AL, Dale County, AL, Houston County, AL, Early County, GA, Miller County, GA, Seminole County, GA
The radar
The Ft Rucker radar (KEOX), 21 km from the middle of the area, began a volume at 21:50 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.8 hours before the alert went out and 145 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
- 49 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 885 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
571
ACUS11 KWNS 312151
SWOMCD
SPC MCD 312150
GAZ000-FLZ000-ALZ000-312345-
Mesoscale Discussion 0312
NWS Storm Prediction Center Norman OK
0450 PM CDT Wed Mar 31 2021
Areas affected...southeast Alabama into southwest Georgia
Concerning...Severe Thunderstorm Watch 71...
Valid 312150Z - 312345Z
The severe weather threat for Severe Thunderstorm Watch 71
continues.
SUMMARY...A line of storms will continue east across the area, with
locally damaging wind gusts.
DISCUSSION...Radar shows an outflow boundary shifting southward
ahead of a squall line, extending from near EOX radar into southwest
GA. Enhanced lift exists where the leading outflow intersects the
main line, with the larger storms near and north of this
intersection. The primary damaging wind risk is likely to translate
east/southeast, or just south of the AL/GA outflow, as air north of
this boundary will be stabilized. Brief low-level rotation is also
possible near the outflow intersection, though the tornado threat is
expected to remain low as the more stable air undercuts the line
with time.
..Jewell.. 03/31/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TAE...MOB...
LAT...LON 31568584 31478548 31328451 31108452 30938479 30938503
31158610 31288621 31398603 31568584SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 1:55 AM CDT | Mesoscale Discussion | SPC | Blount, Cullman, Fayette, Franklin, Lamar, Lawrence and 5 more | 2 hr |
| Mar 31, 10:57 AM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bullock, Butler, Chambers, Choctaw and 17 more | 93 min |
| Mar 31, 11:19 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 23 more | 6 hr |
| Mar 31, 2:15 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Butler, Clarke, Conecuh, Crenshaw and 4 more | 90 min |
| Mar 31, 2:52 PM CDT | Mesoscale Discussion | SPC | Baldwin, Coffee, Covington, Dale, Escambia, Geneva and 2 more | 53 min |
| Mar 31, 3:12 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Coffee, Covington, Dale, Escambia, Geneva and 3 more | 4 hr |
| Mar 31, 5:24 PM CDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 11 more | 2 hr |
Nearby
Mesoscale Discussions in Alabama, 2021Mesoscale Discussions in Georgia, 2021Every mesoscale discussion in 2021
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.