Alert archive / Alabama / Mesoscale Discussions in 2022

Mesoscale Discussion 1982

November 29, 202215 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Nov 29, 2022, 3:35 PM CST for 15 counties in Alabama. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Nov 29, 2022, 3:35 PM CST (21:35 UTC)
Expired: Nov 29, 2022, 5:30 PM CST
In force: 115 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...tornado watch likely
Chance of a watch: 80%

Counties Bibb County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 81 km from the middle of the area, began a volume at 21:37 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.

Tornado Watch 573Nov 29, 4:40 PM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.6 hours before the alert went out and 86 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1309 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 29, 10:56 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison	2 hr
Nov 29, 1:52 PM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more	113 min
Nov 29, 4:42 PM CST	Tornado Watch	SPC	Bibb, Dallas, Fayette, Greene, Hale, Lamar and 6 more	6 hr
Nov 29, 4:45 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Monroe, Washington	90 min
Nov 29, 5:07 PM CST	Tornado Watch	SPC	Choctaw, Clarke, Monroe, Washington, Wilcox	6 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.