Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 669

May 3, 2007Pickens County, Alabama; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2007, 3:22 PM CDT for Pickens County, Alabama; 16 counties in Mississippi. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 3, 2007, 3:22 PM CDT (20:22 UTC)
Expired: May 3, 2007, 4:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Pickens County, AL, Attala County, MS, Choctaw County, MS, Clay County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lowndes County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Smith County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 91 km from the middle of the area, began a volume at 20:25 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 12:00Z, 8.4 hours before the alert went out and 97 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 3, 11:27 AM CDT	Severe Thunderstorm Watch	SPC	Amite, Covington, Forrest, Franklin, Hancock, Harrison and 11 more	4 hr
May 3, 4:46 PM CDT	Mesoscale Discussion	SPC	Holmes, Humphreys, Issaquena, Leflore, Madison, Sharkey and 3 more	59 min
May 3, 5:38 PM CDT	Tornado Watch	SPC	Bolivar, Carroll, Coahoma, DeSoto, Grenada, Holmes and 15 more	3 hr
May 3, 6:27 PM CDT	Tornado Watch	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 7 more	4 hr

Nearby

Mesoscale Discussions in Mississippi, 2007 Mesoscale Discussions in Alabama, 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.