Alert archive / Alabama / Mesoscale Discussions in 2016

Mesoscale Discussion 131

February 23, 201615 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2016, 5:35 PM CST for 15 counties in Alabama. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Feb 23, 2016, 5:35 PM CST (23:35 UTC)
Expired: Feb 23, 2016, 7:30 PM CST
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Autauga County, AL, Bibb County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Hale County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Perry County, AL, Shelby County, AL, Talladega County, AL, Tallapoosa County, AL

The radar

The Birmingham radar (KBMX), 48 km from the middle of the area, began a volume at 23:35 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 22Feb 23, 5:55 PM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.6 hours before the alert went out and 49 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: 546 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 147 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
Feb 23, 1:15 PM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Escambia and 5 more	2 hr
Feb 23, 2:13 PM CST	Tornado Watch PDS	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	8 hr
Feb 23, 4:29 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Covington, Crenshaw and 3 more	61 min
Feb 23, 5:18 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Monroe, Washington, Wilcox	117 min
Feb 23, 5:53 PM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 21 more	6 hr

Nearby

Mesoscale Discussions in Alabama, 2016 Every mesoscale discussion in 2016

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.