Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 561

April 4, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2008, 7:18 PM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2008, 7:18 PM CDT (00:18 UTC)
Expired: Apr 4, 2008, 8:45 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 57 counties

Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Washington County, AL, Wilcox County, AL, Bibb County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Crawford County, GA, Crisp County, GA, Dooly County, GA, Dougherty County, GA, Houston County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Muscogee County, GA, Peach County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Turner County, GA, Webster County, GA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 67 km from the middle of the area, began a volume at 00:18 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, 0.3 hours before the alert went out and 208 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: 1152 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 931 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.5

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
Apr 4, 7:12 PM CDT	Mesoscale Discussion	SPC	Bullock, Lee, Macon, Montgomery, Russell	63 min
Apr 4, 10:37 PM CDT	Mesoscale Discussion	SPC	Baldwin, Conecuh, Covington, Escambia, Mobile	83 min
Apr 4, 7:35 PM CDT	Mesoscale Discussion	SPC	Columbia, Glascock, Jefferson, Lincoln, McDuffie, Richmond and 1 more	115 min
Apr 5, 9:45 AM CDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Berrien, Brantley, Brooks and 28 more	90 min
Apr 5, 10:25 AM CDT	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Berrien, Brantley, Brooks and 37 more	9 hr
Apr 5, 12:47 PM CDT	Mesoscale Discussion	SPC	Brantley, Bryan, Camden, Charlton, Chatham, Echols and 8 more	88 min
Apr 5, 5:41 PM CDT	Mesoscale Discussion	SPC	Charlton	94 min
Apr 4, 11:33 PM CDT	Mesoscale Discussion	SPC	Assumption, Iberia, Jefferson, Lafourche, Plaquemines, Saint Bernard and 4 more	57 min

Nearby

Mesoscale Discussions in Alabama, 2008 Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in Mississippi, 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.