Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 178

February 6, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2008, 4:27 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 6, 2008, 4:27 AM CST (10:27 UTC)
Expired: Feb 6, 2008, 6:30 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Baldwin County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Pike County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 102 km from the middle of the area, began a volume at 10:26 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.5 hours before the alert went out and 91 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: 1219 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 647 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.3

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
Feb 5, 9:39 PM CST	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, Fayette, Franklin, Jackson and 10 more	96 min
Feb 5, 10:01 PM CST	Tornado Watch	SPC	Bibb, Blount, Colbert, Cullman, DeKalb, Etowah and 23 more	8 hr
Feb 6, 1:23 AM CST	Tornado Watch	SPC	Choctaw, Clarke, Mobile, Washington	6 hr
Feb 6, 2:41 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Colbert, Cullman and 25 more	2 hr
Feb 6, 4:06 AM CST	Tornado Watch	SPC	Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 24 more	6 hr
Feb 6, 5:04 AM CST	Tornado Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	5 hr
Feb 6, 6:10 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Calhoun and 34 more	2 hr
Feb 6, 7:06 AM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Coffee, Dale, Geneva and 6 more	6 hr
Feb 6, 10:20 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more	85 min
Feb 6, 1:52 PM CST	Mesoscale Discussion	SPC	Baker, Columbia, Duval, Franklin, Gadsden, Gulf and 10 more	53 min
Feb 5, 8:07 PM CST	Mesoscale Discussion	SPC	East Carroll, Morehouse, West Carroll	83 min
Feb 6, 1:02 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 18 more	58 min

Nearby

Mesoscale Discussions in Alabama, 2008 Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Louisiana, 2008 Every mesoscale discussion in 2008

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.