Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 670

May 3, 2007Ashley County, Chicot County, Arkansas; 5 parishes in Louisiana; 9 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2007, 4:46 PM CDT for Ashley County, Chicot County, Arkansas; 5 parishes in Louisiana; 9 counties in Mississippi. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 3, 2007, 4:46 PM CDT (21:46 UTC)
Expired: May 3, 2007, 5:45 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Ashley County, AR, Chicot County, AR, East Carroll Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, West Carroll Parish, LA, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Madison County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 133 km from the middle of the area, began a volume at 21:48 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

Jackson, MS (KJAN), launched 12:00Z, 9.8 hours before the alert went out and 123 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: 389 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 2, 7:24 PM CDT	Mesoscale Discussion	SPC	Columbia, Lafayette, Miller	96 min
May 2, 7:59 PM CDT	Tornado Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	7 hr
May 2, 11:09 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 1 more	96 min
May 3, 5:38 PM CDT	Tornado Watch	SPC	Arkansas, Chicot, Desha, Drew, Lee, Lincoln and 2 more	3 hr
May 3, 1:21 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Grant and 8 more	84 min
May 3, 11:27 AM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more	4 hr
May 3, 3:08 PM CDT	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Cameron, De Soto, Grant and 6 more	7 hr
May 3, 6:27 PM CDT	Tornado Watch	SPC	Avoyelles, Caldwell, Catahoula, Concordia, Franklin, LaSalle and 3 more	4 hr
May 3, 6:34 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Cameron, De Soto, Grant and 4 more	116 min
May 3, 3:22 PM CDT	Mesoscale Discussion	SPC	Attala, Choctaw, Clay, Jasper, Kemper, Lauderdale and 10 more	53 min

Nearby

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