Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 204

February 22, 2005Choctaw County, Marengo County, Alabama; 5 parishes in Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 22, 2005, 2:40 PM CST for Choctaw County, Marengo County, Alabama; 5 parishes in Louisiana; 14 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 22, 2005, 2:40 PM CST (20:40 UTC)
Expired: Feb 22, 2005, 4:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 21 counties

Choctaw County, AL, Marengo County, AL, Catahoula Parish, LA, Concordia Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Tensas Parish, LA, Adams County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Jasper County, MS, Jefferson County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Newton County, MS, Simpson County, MS, Smith County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 62 km from the middle of the area, began a volume at 20:43 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

Jackson, MS (KJAN), launched 12:00Z, 8.7 hours before the alert went out and 61 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: 810 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 21, 6:05 PM CST	Severe Thunderstorm Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 4 more	7 hr
Feb 21, 9:40 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Bullock, Chambers, Chilton, Coosa and 6 more	6 hr
Feb 21, 9:43 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 14 more	92 min
Feb 22, 12:39 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 14 more	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Alabama, 2005 Every mesoscale discussion in 2005

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.