Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 1834

October 8, 201410 counties in Alabama; 18 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 8, 2014, 2:58 PM CDT for 10 counties in Alabama; 18 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Oct 8, 2014, 2:58 PM CDT (19:58 UTC)
Expired: Oct 8, 2014, 4:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Blount County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Marion County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Calhoun County, MS, Chickasaw County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 23 km from the middle of the area, began a volume at 20:01 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 (KBYH), launched 12:00Z, 8.0 hours before the alert went out and 160 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: 2170 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

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
Oct 8, 9:02 AM CDT	Mesoscale Discussion	SPC	Bolivar, Coahoma, DeSoto, Panola, Quitman, Tallahatchie and 2 more	88 min

Nearby

Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Alabama, 2014 Every mesoscale discussion in 2014

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.