Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 1833

October 8, 201424 counties in Arkansas; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 8, 2014, 9:02 AM CDT for 24 counties in Arkansas; 8 counties in Mississippi. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Oct 8, 2014, 9:02 AM CDT (14:02 UTC)
Expired: Oct 8, 2014, 10:30 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 32 counties

Arkansas County, AR, Conway County, AR, Desha County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Perry County, AR, Phillips County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS

The radar

The Little Rock radar (KLZK), 16 km from the middle of the area, began a volume at 14:02 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, 2.0 hours before the alert went out and 196 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, 2:58 PM CDT	Mesoscale Discussion	SPC	Calhoun, Chickasaw, Clay, Grenada, Itawamba, Lafayette and 12 more	92 min

Nearby

Mesoscale Discussions in Arkansas, 2014 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.