Alert archive / Alabama / Mesoscale Discussions in 2020

Mesoscale Discussion 41

January 11, 202016 counties in Alabama; 11 counties in Florida; 10 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 2:26 PM CST for 16 counties in Alabama; 11 counties in Florida; 10 counties in Georgia. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2020, 2:26 PM CST (20:26 UTC)
Expired: Jan 11, 2020, 4:00 PM CST
In force: 94 min
Issued by: the Storm Prediction Center

All 37 counties

Barbour County, AL, Bullock County, AL, Butler County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Early County, GA, Miller County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA

The radar

The Eglin Afb radar (KEVX), 42 km from the middle of the area, began a volume at 20:26 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 16Jan 11, 2:45 PM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.4 hours before the alert went out and 156 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: 44 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jan 11, 6:12 AM CST	Mesoscale Discussion	SPC	Colbert, Lauderdale, Limestone, Madison	93 min
Jan 11, 6:57 AM CST	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 7 more	7 hr
Jan 11, 7:39 AM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Greene, Hale, Marengo, Mobile and 3 more	96 min
Jan 11, 7:57 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Chilton and 22 more	9 hr
Jan 11, 9:28 AM CST	Mesoscale Discussion	SPC	Blount, Cullman, DeKalb, Fayette, Jackson, Lawrence and 7 more	92 min
Jan 11, 9:54 AM CST	Mesoscale Discussion	SPC	Choctaw, Greene, Marengo, Pickens, Sumter, Washington	96 min
Jan 11, 11:50 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Choctaw, Clarke, Cullman and 15 more	85 min
Jan 11, 12:20 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 9 more	85 min
Jan 11, 12:42 PM CST	Tornado Watch	SPC	Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 15 more	7 hr
Jan 11, 1:15 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Chilton, DeKalb, Etowah and 6 more	90 min
Jan 11, 2:44 PM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	5 hr
Jan 11, 3:16 PM CST	Mesoscale Discussion	SPC	Bullock, Chambers, Clay, Cleburne, Lee, Macon and 3 more	89 min
Jan 11, 5:21 PM CST	Mesoscale Discussion	SPC	Houston	114 min
Jan 11, 3:48 PM CST	Mesoscale Discussion	SPC	Banks, Elbert, Franklin, Habersham, Hart, Madison and 2 more	117 min
Jan 11, 4:38 PM CST	Tornado Watch	SPC	Baldwin, Bleckley, Burke, Clarke, Columbia, Dodge and 34 more	6 hr
Jan 11, 5:36 PM CST	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 63 more	84 min

Nearby

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