Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 1681

July 14, 200418 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2004, 11:38 PM CDT for 18 counties in Mississippi. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2004, 11:38 PM CDT (04:38 UTC)
Expired: Jul 15, 2004, 1:15 AM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Attala County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Kemper County, MS, Leflore County, MS, Lowndes County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Sunflower County, MS, Tallahatchie County, MS, Webster County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 138 km from the middle of the area, began a volume at 04:37 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, 4.6 hours before the alert went out and 149 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: 1134 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 14 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
Jul 14, 7:10 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 15 more	6 hr
Jul 14, 10:41 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 15 more	94 min
Jul 15, 1:12 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 35 more	2 hr
Jul 15, 2:20 PM CDT	Severe Thunderstorm Watch	SPC	Claiborne, Clarke, Copiah, Covington, Forrest, George and 24 more	6 hr
Jul 15, 5:18 PM CDT	Mesoscale Discussion	SPC	Claiborne, Clarke, Copiah, Covington, Forrest, George and 24 more	117 min

Nearby

Mesoscale Discussions in Mississippi, 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.