Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 142

February 10, 201312 counties in Alabama; George County, Greene County, Wayne County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2013, 2:39 PM CST for 12 counties in Alabama; George County, Greene County, Wayne County, Mississippi. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2013, 2:39 PM CST (20:39 UTC)
Expired: Feb 10, 2013, 3:45 PM CST
In force: 66 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 99 km from the middle of the area, began a volume at 20:40 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.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.7 hours before the alert went out and 212 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: 1188 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 364 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 10, 3:14 PM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 11 more	8 hr
Feb 10, 5:03 PM CST	Mesoscale Discussion	SPC	Choctaw, Washington	27 min
Feb 10, 10:19 AM CST	Mesoscale Discussion	SPC	Holmes, Humphreys, Issaquena, Leflore, Sharkey, Sunflower and 2 more	86 min
Feb 10, 10:53 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 12 more	97 min
Feb 10, 11:10 AM CST	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 26 more	7 hr
Feb 10, 1:59 PM CST	Mesoscale Discussion	SPC	Amite, Copiah, Covington, Forrest, Franklin, Jasper and 13 more	91 min
Feb 10, 3:47 PM CST	Mesoscale Discussion	SPC	Amite, Covington, Forrest, George, Greene, Jefferson Davis and 10 more	88 min
Feb 10, 5:34 PM CST	Tornado Watch	SPC	Amite, Clarke, Copiah, Covington, Forrest, Franklin and 14 more	5 hr

Nearby

Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Mississippi, 2013 Every mesoscale discussion in 2013

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.