Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 188

March 4, 20118 counties in Arkansas; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 4, 2011, 10:48 PM CST for 8 counties in Arkansas; 6 counties in Missouri. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 4, 2011, 10:48 PM CST (04:48 UTC)
Expired: Mar 5, 2011, 12:15 AM CST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Clay County, AR, Cleburne County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Randolph County, AR, Sharp County, AR, White County, AR, Bollinger County, MO, Butler County, MO, Carter County, MO, Ripley County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Memphis radar (KNQA), 158 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 (KLZK), launched 00:00Z, 4.8 hours before the alert went out and 194 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: 745 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 482 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

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
Mar 4, 6:22 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Fulton, Marion	53 min
Mar 4, 6:50 PM CST	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 23 more	7 hr

Nearby

Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Missouri, 2011 Every mesoscale discussion in 2011

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.