Alert archive / Alabama / Mesoscale Discussions in 2020

Mesoscale Discussion 1004

June 25, 202010 counties in Alabama; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2020, 6:45 PM CDT for 10 counties in Alabama; 7 counties in Mississippi. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2020, 6:45 PM CDT (23:45 UTC)
Expired: Jun 25, 2020, 8:15 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Bibb County, AL, Chilton County, AL, Choctaw County, AL, Greene County, AL, Hale County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Clarke County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Neshoba County, MS, Newton County, MS, Wayne County, MS

The radar

The Birmingham radar (KBMX), 161 km from the middle of the area, began a volume at 23:45 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, 11.8 hours before the alert went out and 161 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: 367 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 25, 1:09 PM CDT	Mesoscale Discussion	SPC	Clarke, Coffee, Conecuh, Covington, Crenshaw, Dale and 5 more	2 hr
Jun 25, 6:22 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Lee, Macon, Russell	83 min
Jun 25, 3:43 PM CDT	Mesoscale Discussion	SPC	Copiah, Covington, Forrest, Franklin, Hancock, Jefferson Davis and 10 more	62 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.