Alert archive / Mississippi / Mesoscale Discussions in 2006

Mesoscale Discussion 665

April 26, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2006, 1:23 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 26, 2006, 1:23 AM CDT (06:23 UTC)
Expired: Apr 26, 2006, 3:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 85 counties

Colbert County, AL, Cullman County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Winston County, AL, Chicot County, AR, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Franklin Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Alcorn County, MS, Amite County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lafayette County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Oktibbeha County, MS, Panola County, MS, Pike County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 78 km from the middle of the area, began a volume at 06:23 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

Little Rock, AR (KLZK), launched 00:00Z, 6.4 hours before the alert went out and 219 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: 890 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

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 26, 2:05 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 31 more	115 min
Apr 25, 7:20 PM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 15 more	55 min
Apr 25, 8:45 PM CDT	Mesoscale Discussion	SPC	Columbia, Union	90 min
Apr 25, 10:01 PM CDT	Mesoscale Discussion	SPC	Crittenden	59 min
Apr 25, 9:42 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Beauregard, Bienville, Calcasieu, Caldwell and 19 more	6 hr
Apr 25, 11:42 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 21 more	63 min
Apr 26, 3:19 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 18 more	86 min

Nearby

Mesoscale Discussions in Mississippi, 2006 Mesoscale Discussions in Louisiana, 2006 Mesoscale Discussions in Alabama, 2006 Every mesoscale discussion in 2006

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.