Alert archive / Alabama / Mesoscale Discussions in 2020

Mesoscale Discussion 80

February 5, 202034 counties in Alabama; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2020, 3:47 PM CST for 34 counties in Alabama; 4 counties in Mississippi. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Feb 5, 2020, 3:47 PM CST (21:47 UTC)
Expired: Feb 5, 2020, 5:45 PM CST
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 38 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Coosa County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Itawamba County, MS, Monroe County, MS, Prentiss County, MS, Tishomingo County, MS

The radar

The Birmingham radar (KBMX), 77 km from the middle of the area, began a volume at 21:47 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

Birmingham, AL (KBMX), launched 12:00Z, 9.8 hours before the alert went out and 76 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: 125 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

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
Feb 5, 11:16 AM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more	119 min
Feb 5, 4:25 PM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 28 more	5 hr
Feb 5, 5:06 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Marengo, Sumter, Washington	84 min
Feb 5, 5:50 PM CST	Tornado Watch	SPC	Choctaw, Clarke, Washington	6 hr
Feb 5, 10:28 AM CST	Mesoscale Discussion	SPC	Adams, Attala, Choctaw, Claiborne, Clay, Copiah and 19 more	92 min
Feb 5, 11:49 AM CST	Tornado Watch	SPC	Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 40 more	6 hr
Feb 5, 1:19 PM CST	Mesoscale Discussion	SPC	Pearl River, Pike, Walthall	86 min
Feb 5, 1:39 PM CST	Mesoscale Discussion	SPC	Adams, Attala, Choctaw, Claiborne, Copiah, Franklin and 12 more	96 min
Feb 5, 3:41 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Attala, Choctaw, Claiborne, Copiah and 26 more	64 min

Nearby

Mesoscale Discussions in Alabama, 2020 Mesoscale Discussions in Mississippi, 2020 Every mesoscale discussion in 2020

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.