Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 1861

October 12, 201416 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 12, 2014, 11:46 PM CDT for 16 counties in Mississippi. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Oct 12, 2014, 11:46 PM CDT (04:46 UTC)
Expired: Oct 13, 2014, 1:15 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Lee County, MS, Leflore County, MS, Monroe County, MS, Montgomery County, MS, Pontotoc County, MS, Sunflower County, MS, Tallahatchie County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 84 km from the middle of the area, began a volume at 04:49 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 00:00Z, 4.8 hours before the alert went out and 123 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: 455 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 12, 8:04 PM CDT	Mesoscale Discussion	SPC	Benton, Bolivar, Carroll, Coahoma, DeSoto, Grenada and 17 more	86 min
Oct 13, 6:34 AM CDT	Mesoscale Discussion	SPC	Bolivar, Carroll, Coahoma, DeSoto, Grenada, Humphreys and 14 more	86 min
Oct 13, 7:08 AM CDT	Tornado Watch	SPC	Adams, Bolivar, Claiborne, Coahoma, DeSoto, Humphreys and 12 more	7 hr
Oct 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Adams, Bolivar, Claiborne, Coahoma, DeSoto, Humphreys and 12 more	115 min
Oct 13, 11:52 AM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 45 more	113 min
Oct 13, 12:57 PM CDT	Tornado Watch	SPC	Adams, Alcorn, Attala, Benton, Bolivar, Calhoun and 63 more	7 hr
Oct 13, 1:39 PM CDT	Tornado Watch	SPC	Amite, George, Greene, Hancock, Harrison, Jackson and 7 more	8 hr
Oct 13, 2:22 PM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 32 more	113 min
Oct 13, 5:27 PM CDT	Mesoscale Discussion	SPC	Itawamba, Monroe, Tishomingo	63 min
Oct 13, 5:45 PM CDT	Mesoscale Discussion	SPC	George, Hancock, Harrison, Pearl River, Stone	90 min

Nearby

Mesoscale Discussions in Mississippi, 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.