Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 2390

December 22, 20118 counties in Alabama; George County, Greene County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 22, 2011, 11:22 AM CST for 8 counties in Alabama; George County, Greene County, Mississippi. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Dec 22, 2011, 11:22 AM CST (17:22 UTC)
Expired: Dec 22, 2011, 12:15 PM CST
In force: 53 min
Issued by: the Storm Prediction Center

Counties Choctaw County, AL, Clarke County, AL, Dallas County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS

The radar

The Mobile radar (KMOB), 96 km from the middle of the area, began a volume at 17:24 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.4 hours before the alert went out and 213 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: 578 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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
Dec 22, 9:32 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 31 more	58 min
Dec 22, 10:00 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more	7 hr
Dec 22, 2:51 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 36 more	54 min
Dec 22, 4:11 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 35 more	34 min
Dec 22, 4:36 AM CST	Tornado Watch	SPC	Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 38 more	7 hr
Dec 22, 7:50 AM CST	Mesoscale Discussion	SPC	Amite, Attala, Choctaw, Clarke, Clay, Copiah and 31 more	55 min

Nearby

Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Mississippi, 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; radar from the NEXRAD Level II archive.