Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 396

March 31, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 11:03 AM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2007, 11:03 AM CDT (16:03 UTC)
Expired: Mar 31, 2007, 12:00 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

All 52 counties

Ashley County, AR, Bradley County, AR, Chicot County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Lincoln County, AR, Phillips County, AR, St. Francis County, AR, Union County, AR, Morehouse Parish, LA, Union Parish, LA, West Carroll Parish, LA, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Yalobusha County, MS, Chester County, TN, Crockett County, TN, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN

The radar

The Little Rock radar (KLZK), 154 km from the middle of the area, began a volume at 16:06 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 12:00Z, 4.1 hours before the alert went out and 134 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: 31 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Mar 30, 7:12 PM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Sebastian, Washington	63 min
Mar 30, 10:06 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Dallas, Garland, Grant, Hempstead and 14 more	84 min
Mar 30, 10:28 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	8 hr
Mar 31, 2:40 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	95 min
Mar 31, 7:08 AM CDT	Mesoscale Discussion	SPC	Acadia, Calcasieu, Cameron, Jefferson Davis, Lafayette, Vermilion	67 min
Mar 31, 8:40 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 15 more	5 hr
Mar 31, 12:08 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 25 more	97 min

Nearby

Mesoscale Discussions in Mississippi, 2007 Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Tennessee, 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.