Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 2300

November 8, 2011Crawford County, Franklin County, Sebastian County, Arkansas; Haskell County, LeFlore County, Sequoyah County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Nov 8, 2011, 9:38 AM CST for Crawford County, Franklin County, Sebastian County, Arkansas; Haskell County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Nov 8, 2011, 9:38 AM CST (15:38 UTC)
Expired: Nov 8, 2011, 10:45 AM CST
In force: 67 min
Issued by: the Storm Prediction Center

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR, Haskell County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 12 km from the middle of the area, began a volume at 15:40 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 875Nov 8, 10:50 AM CST

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 3.6 hours before the alert went out and 193 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: 7 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: -281 m²/s²
0-3 km storm-relative helicity: -149 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
Nov 8, 1:17 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 16 more	118 min
Nov 8, 10:31 AM CST	Mesoscale Discussion	SPC	Baxter, Clark, Cleburne, Columbia, Conway, Dallas and 31 more	29 min
Nov 8, 10:49 AM CST	Tornado Watch	SPC	Clark, Cleburne, Columbia, Conway, Dallas, Faulkner and 25 more	7 hr
Nov 8, 1:03 PM CST	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Conway, Dallas, Faulkner and 22 more	57 min
Nov 8, 3:48 PM CST	Mesoscale Discussion	SPC	Clark, Cleburne, Columbia, Conway, Faulkner, Garland and 18 more	87 min
Nov 8, 5:09 PM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 7 more	66 min
Nov 8, 5:30 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 17 more	7 hr
Nov 7, 7:43 PM CST	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Creek and 22 more	62 min
Nov 7, 8:28 PM CST	Tornado Watch	SPC	Adair, Caddo, Canadian, Carter, Cherokee, Cleveland and 36 more	8 hr
Nov 7, 11:20 PM CST	Mesoscale Discussion	SPC	Carter, Cherokee, Cleveland, Cotton, Craig, Creek and 22 more	85 min
Nov 8, 2:12 AM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 4 more	93 min

Nearby

Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Oklahoma, 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.