Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 2224

December 25, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2012, 8:00 PM CST for 5 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 25, 2012, 8:00 PM CST (02:00 UTC)
Expired: Dec 26, 2012, 2:00 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 37 counties

Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Faulkner County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Perry County, AR, Poinsett County, AR, Pulaski County, AR, Randolph County, AR, Sharp County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Union County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Livingston County, KY, McCracken County, KY, Butler County, MO, Cape Girardeau County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Lake County, TN

The radar

The Memphis radar (KNQA), 112 km from the middle of the area, began a volume at 02:00 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

Nashville Metro, TN (KBNA), launched 00:00Z, 2.0 hours before the alert went out and 342 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 518 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 308 m²/s²
0-3 km storm-relative helicity: 424 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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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 26, 2:25 AM CST	Mesoscale Discussion	SPC	Alexander, Clark, Clay, Crawford, Edwards, Franklin and 18 more	6 hr

Nearby

Mesoscale Discussions in Arkansas, 2012 Mesoscale Discussions in Missouri, 2012 Mesoscale Discussions in Illinois, 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.