Alert archive / Arkansas / Mesoscale Discussions in 2006

Mesoscale Discussion 245

March 11, 20064 counties in Arkansas; 4 counties in Oklahoma; Lamar County, Red River County, Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 11, 2006, 7:48 PM CST for 4 counties in Arkansas; 4 counties in Oklahoma; Lamar County, Red River County, Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 11, 2006, 7:48 PM CST (01:48 UTC)
Expired: Mar 11, 2006, 9:15 PM CST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 115 km from the middle of the area, began a volume at 01:48 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 65Mar 11, 9:35 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.8 hours before the alert went out and 219 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: 1456 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1432 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

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 11, 6:11 PM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Fulton, Marion, Washington	2 hr
Mar 11, 6:49 PM CST	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 10 more	7 hr
Mar 11, 9:34 PM CST	Tornado Watch	SPC	Conway, Garland, Howard, Johnson, Logan, Montgomery and 8 more	4 hr
Mar 11, 11:13 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	92 min
Mar 12, 1:07 AM CST	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 6 more	7 hr
Mar 12, 3:39 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Crawford and 17 more	96 min
Mar 12, 12:46 PM CST	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 24 more	9 hr
Mar 12, 3:38 PM CST	Mesoscale Discussion	SPC	Benton, Crawford, Franklin, Madison, Polk, Scott and 2 more	2 hr
Mar 12, 11:29 AM CST	Mesoscale Discussion	SPC	Adair, Cherokee, Coal, Craig, Creek, Delaware and 24 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2006 Mesoscale Discussions in Oklahoma, 2006 Mesoscale Discussions in Texas, 2006 Every mesoscale discussion in 2006

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.