Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2515

December 7, 20045 counties in Alabama; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 7, 2004, 6:03 AM CST for 5 counties in Alabama; 7 counties in Mississippi. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Dec 7, 2004, 6:03 AM CST (12:03 UTC)
Expired: Dec 7, 2004, 7:00 AM CST
In force: 57 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Clarke County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 44 km from the middle of the area, began a volume at 12:06 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, 0.1 hours before the alert went out and 135 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: 329 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 313 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.2

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, 1:25 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Choctaw, Clarke, Cullman, Fayette and 14 more	95 min
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, 6:58 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Cullman, Hale, Jackson, Jefferson and 3 more	62 min
Dec 6, 9:51 PM CST	Mesoscale Discussion	SPC	DeSoto, Tunica	114 min
Dec 6, 11:00 PM CST	Mesoscale Discussion	SPC	Adams, Attala, Bolivar, Calhoun, Carroll, Chickasaw and 45 more	90 min
Dec 6, 11:20 PM CST	Tornado Watch	SPC	Adams, Attala, Bolivar, Calhoun, Carroll, Chickasaw and 38 more	6 hr

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.