Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2512

December 7, 200420 counties in Alabama; Concordia Parish, Tensas Parish, Louisiana; 47 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 7, 2004, 1:25 AM CST for 20 counties in Alabama; Concordia Parish, Tensas Parish, Louisiana; 47 counties in Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Dec 7, 2004, 1:25 AM CST (07:25 UTC)
Expired: Dec 7, 2004, 3:00 AM CST
In force: 95 min
Issued by: the Storm Prediction Center

All 69 counties

Bibb County, AL, Blount County, AL, Choctaw County, AL, Clarke County, AL, Cullman County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Winston County, AL, Concordia Parish, LA, Tensas Parish, LA, Adams County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Itawamba County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 51 km from the middle of the area, began a volume at 07:24 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 915Dec 7, 3:25 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 7.4 hours before the alert went out and 57 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: 278 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 650 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.6

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
Dec 7, 3:25 AM CST	Tornado Watch	SPC	Bibb, Blount, Cullman, Fayette, Franklin, Greene and 17 more	5 hr
Dec 7, 4:56 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Cullman, Fayette, Greene, Hale and 13 more	94 min
Dec 7, 6:03 AM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Mobile, Monroe, Washington	57 min
Dec 7, 6:58 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Cullman, Hale, Jackson, Jefferson and 3 more	62 min
Dec 6, 8:36 PM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, East Carroll, Franklin and 13 more	84 min
Dec 6, 8:50 PM CST	Severe Thunderstorm Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, Franklin and 13 more	5 hr
Dec 6, 11:00 PM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 15 more	90 min
Dec 6, 11:20 PM CST	Tornado Watch	SPC	Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 9 more	6 hr
Dec 6, 9:51 PM CST	Mesoscale Discussion	SPC	DeSoto, Tunica	114 min

Nearby

Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Louisiana, 2004 Every mesoscale discussion in 2004

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.