Alert archive / Alabama / Mesoscale Discussions in 2020

Mesoscale Discussion 839

June 5, 202023 counties in Alabama; 5 counties in Georgia; Tishomingo County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2020, 9:53 AM CDT for 23 counties in Alabama; 5 counties in Georgia; Tishomingo County, Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 5, 2020, 9:53 AM CDT (14:53 UTC)
Expired: Jun 5, 2020, 12:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

All 29 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jefferson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Walker County, AL, Winston County, AL, Carroll County, GA, Floyd County, GA, Haralson County, GA, Paulding County, GA, Polk County, GA, Tishomingo County, MS

The radar

The Northeast Alabama radar (KHTX), 93 km from the middle of the area, began a volume at 14:53 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.

Severe Thunderstorm Watch 258Jun 5, 10:55 AM CDT

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 2.9 hours before the alert went out and 122 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: 690 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 53 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
Jun 5, 5:02 PM CDT	Mesoscale Discussion	SPC	Fayette, Pickens	88 min
Jun 5, 10:38 AM CDT	Mesoscale Discussion	SPC	Coahoma, DeSoto, Marshall, Panola, Quitman, Tate and 1 more	2 hr
Jun 5, 11:03 AM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	6 hr
Jun 5, 1:18 PM CDT	Mesoscale Discussion	SPC	Benton, Coahoma, DeSoto, Lafayette, Marshall, Panola and 5 more	87 min
Jun 5, 2:07 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Carroll, Choctaw, Clay, Grenada and 22 more	83 min
Jun 5, 2:49 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 38 more	6 hr

Nearby

Mesoscale Discussions in Alabama, 2020 Mesoscale Discussions in Georgia, 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.