Alert archive / Alabama / Mesoscale Discussions in 2022

Mesoscale Discussion 430

April 6, 202238 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2022, 5:06 PM CDT for 38 counties in Alabama. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2022, 5:06 PM CDT (22:06 UTC)
Expired: Apr 6, 2022, 7:00 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 101

All 38 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Crenshaw County, AL, Cullman County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Marshall County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Wilcox County, AL

The radar

The Birmingham radar (KBMX), 26 km from the middle of the area, began a volume at 22:05 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

Birmingham, AL (KBMX), launched 12:00Z, 10.1 hours before the alert went out and 27 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1131 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

713 
ACUS11 KWNS 062207
SWOMCD
SPC MCD 062206 
GAZ000-ALZ000-MSZ000-070000-

Mesoscale Discussion 0430
NWS Storm Prediction Center Norman OK
0506 PM CDT Wed Apr 06 2022

Areas affected...Central Alabama

Concerning...Severe Thunderstorm Watch 101...

Valid 062206Z - 070000Z

The severe weather threat for Severe Thunderstorm Watch 101
continues.

SUMMARY...The threat for severe hail and damaging wind gusts
continues across central AL as a cold front pushes in from the east.

DISCUSSION...Latest convective trends over central AL continue to
show numerous attempts at robust convective initiation, but more
isolated/discrete storms have struggled to mature amid weak forcing
for ascent away from the synoptic cold front and outflow boundaries
from the complex to the east. However, thunderstorm intensity along
the front has undergone slight intensification over the past hour
based on IR cloud top temperature trends. This coincides with peak
daytime heating that is supporting upwards of 2500 J/kg SBCAPE.
Thunderstorm intensity may reach a peak in the coming hours as
storms continue to develop along the front and meandering outflow
boundaries. 0-6 km hodographs from the KBMX VWP show deep-layer
shear vectors off the cold front, which will support the potential
for organized convection, including a few supercells with an
attendant hail/wind threat.

..Moore.. 04/06/2022

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...FFC...BMX...HUN...MOB...JAN...

LAT...LON   33278820 33728755 34358674 34288592 33998540 33378516
            32578524 31948544 31648605 31628705 31878783 32268820
            33048860 33278820

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 11:28 AM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 21 more	3 hr
Apr 6, 11:58 AM CDT	Mesoscale Discussion	SPC	Houston	2 hr
Apr 6, 12:59 PM CDT	Mesoscale Discussion	SPC	Cullman, Fayette, Franklin, Jackson, Lamar, Lawrence and 5 more	2 hr
Apr 6, 1:11 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 30 more	10 hr
Apr 6, 2:58 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Bullock, Chambers, Chilton, Clay and 24 more	2 hr
Apr 6, 3:43 PM CDT	Mesoscale Discussion	SPC	DeKalb, Jackson, Limestone, Madison, Marshall, Morgan	62 min
Apr 6, 3:59 PM CDT	Tornado Watch	SPC	DeKalb, Jackson, Marshall	5 hr

Nearby

Mesoscale Discussions in Alabama, 2022 Every mesoscale discussion in 2022

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.