Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 1405

July 7, 200713 counties in Alabama; 9 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2007, 11:23 AM CDT for 13 counties in Alabama; 9 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 7, 2007, 11:23 AM CDT (16:23 UTC)
Expired: Jul 7, 2007, 2:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 22 counties

Autauga County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Jones County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 107 km from the middle of the area, began a volume at 16:22 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, 4.4 hours before the alert went out and 205 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: 605 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 574 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

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 7, 3:48 PM CDT	Tornado Watch	SPC	Autauga, Barbour, Bullock, Elmore, Lee, Lowndes and 4 more	4 hr
Jul 7, 5:17 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Chambers, Chilton and 13 more	88 min

Nearby

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