Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2346

October 21, 200421 counties in Alabama; 27 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 21, 2004, 1:14 AM CDT for 21 counties in Alabama; 27 counties in Mississippi. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Oct 21, 2004, 1:14 AM CDT (06:14 UTC)
Expired: Oct 21, 2004, 2:15 AM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 48 counties

Autauga County, AL, Bibb County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marengo County, AL, Marion County, AL, Monroe County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Attala County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Jasper County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Union County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 92 km from the middle of the area, began a volume at 06:15 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

Birmingham, AL (KBMX), launched 00:00Z, 6.2 hours before the alert went out and 152 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: 1078 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 744 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

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Nearby

Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Alabama, 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.