Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 2530

December 4, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Dec 4, 2005, 5:45 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 4, 2005, 5:45 PM CST (23:45 UTC)
Expired: Dec 4, 2005, 7:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 45 counties

Baldwin County, AL, Clarke County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 97 km from the middle of the area, began a volume at 23:48 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, 11.8 hours before the alert went out and 77 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: 207 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 3, 9:35 PM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Lauderdale, Lawrence, Marion	115 min
Dec 3, 10:01 PM CST	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 8 more	7 hr
Dec 4, 2:00 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 19 more	90 min
Dec 4, 12:24 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 31 more	96 min
Dec 4, 1:18 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 33 more	6 hr
Dec 4, 3:30 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Bullock, Calhoun, Chambers, Chilton and 22 more	90 min
Dec 4, 10:14 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 19 more	2 hr
Dec 4, 11:39 AM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 25 more	6 hr
Dec 4, 2:11 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 19 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.