Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 287

April 7, 200427 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2004, 8:22 PM CDT for 27 counties in Mississippi. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2004, 8:22 PM CDT (01:22 UTC)
Expired: Apr 7, 2004, 9:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 27 counties

Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 111 km from the middle of the area, began a volume at 01:23 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

Jackson, MS (KJAN), launched 00:00Z, 1.4 hours before the alert went out and 106 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: 1040 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 1446 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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 7, 7:20 PM CDT	Severe Thunderstorm Watch	SPC	Washington	6 hr
Apr 7, 9:59 PM CDT	Mesoscale Discussion	SPC	Adams, Attala, Carroll, Claiborne, Copiah, Covington and 23 more	61 min
Apr 7, 11:43 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Copiah, Franklin, Jefferson, Lincoln and 1 more	62 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.