Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 11

January 5, 2007Choctaw County, Mobile County, Washington County, Alabama; 5 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 5, 2007, 2:26 AM CST for Choctaw County, Mobile County, Washington County, Alabama; 5 parishes in Louisiana; 7 counties in Mississippi. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jan 5, 2007, 2:26 AM CST (08:26 UTC)
Expired: Jan 5, 2007, 3:30 AM CST
In force: 64 min
Issued by: the Storm Prediction Center

Counties Choctaw County, AL, Mobile County, AL, Washington County, AL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Kemper County, MS, Lauderdale County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 85 km from the middle of the area, began a volume at 08:28 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 00:00Z, 8.4 hours before the alert went out and 74 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: 478 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.9

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
Jan 4, 8:47 PM CST	Tornado Watch	SPC	Choctaw, Mobile, Washington	7 hr
Jan 5, 12:47 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 57 more	28 min
Jan 5, 1:15 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 48 more	6 hr
Jan 5, 3:13 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 47 more	62 min
Jan 5, 5:46 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Blount, Bullock, Butler, Calhoun and 28 more	59 min
Jan 5, 7:21 AM CST	Tornado Watch	SPC	Barbour, Bullock, Butler, Chambers, Clay, Coffee and 16 more	8 hr
Jan 5, 9:02 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Chambers, Clay, Cleburne and 17 more	118 min
Jan 4, 6:34 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 7 more	86 min
Jan 4, 8:33 PM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint Tammany and 1 more	87 min
Jan 4, 10:56 PM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany, Washington	94 min

Nearby

Mesoscale Discussions in Mississippi, 2007 Mesoscale Discussions in Louisiana, 2007 Mesoscale Discussions in Alabama, 2007 Every mesoscale discussion in 2007

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.