Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 175

February 28, 201121 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2011, 12:19 PM CST for 21 counties in Alabama. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Feb 28, 2011, 12:19 PM CST (18:19 UTC)
Expired: Feb 28, 2011, 1:45 PM CST
In force: 86 min
Issued by: the Storm Prediction Center

All 21 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Wilcox County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.3 hours before the alert went out and 168 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: 652 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 425 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 5:47 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Jackson, Lamar, Lauderdale, Lawrence and 5 more	28 min
Feb 28, 5:59 AM CST	Tornado Watch	SPC	Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more	7 hr
Feb 28, 11:25 AM CST	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 11 more	95 min
Feb 28, 12:29 PM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 41 more	7 hr
Feb 28, 3:36 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Bullock, Calhoun, Chambers, Cherokee and 24 more	84 min
Feb 28, 5:16 PM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Butler, Clarke, Coffee, Conecuh and 12 more	89 min

Nearby

Mesoscale Discussions in Alabama, 2011 Every mesoscale discussion in 2011

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.