Alert archive / Mississippi / Mesoscale Discussions in 2012

Mesoscale Discussion 1715

August 6, 2012Washington County, Alabama; 26 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2012, 12:57 PM CDT for Washington County, Alabama; 26 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 6, 2012, 12:57 PM CDT (17:57 UTC)
Expired: Aug 6, 2012, 2:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 27 counties

Washington County, AL, Attala County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 96 km from the middle of the area, began a volume at 17:59 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, 6.0 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: 1923 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 28 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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Nearby

Mesoscale Discussions in Mississippi, 2012 Mesoscale Discussions in Alabama, 2012 Every mesoscale discussion in 2012

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.