Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 1716

July 16, 200412 counties in Arkansas; 11 parishes in Louisiana; 29 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 16, 2004, 6:44 PM CDT for 12 counties in Arkansas; 11 parishes in Louisiana; 29 counties in Mississippi. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jul 16, 2004, 6:44 PM CDT (23:44 UTC)
Expired: Jul 16, 2004, 7:45 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 52 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lincoln County, AR, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 144 km from the middle of the area, began a volume at 23:47 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.

Severe Thunderstorm Watch 652Jul 16, 9:45 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.7 hours before the alert went out and 135 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: 3154 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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
Jul 15, 7:34 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Drew	86 min
Jul 15, 8:01 PM CDT	Mesoscale Discussion	SPC	Benton, Bradley, Calhoun, Carroll, Clark, Cleveland and 34 more	119 min
Jul 16, 8:35 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Boone, Calhoun, Carroll, Clark and 43 more	4 hr
Jul 16, 12:23 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Desha, Drew, Jefferson and 4 more	97 min
Jul 16, 12:45 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 12 more	6 hr
Jul 16, 3:03 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Cleveland, Desha and 5 more	117 min
Jul 16, 3:37 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 32 more	113 min
Jul 16, 11:42 AM CDT	Mesoscale Discussion	SPC	Washington	3 hr

Nearby

Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Arkansas, 2004 Mesoscale Discussions in Louisiana, 2004 Every mesoscale discussion in 2004

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.