Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 201

February 11, 200824 counties in Arkansas; 12 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2008, 10:51 PM CST for 24 counties in Arkansas; 12 counties in Oklahoma; 13 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Feb 11, 2008, 10:51 PM CST (04:51 UTC)
Expired: Feb 12, 2008, 12:45 AM CST
In force: 114 min
Issued by: the Storm Prediction Center

All 49 counties

Cleburne County, AR, Conway County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Howard County, AR, Independence County, AR, Johnson County, AR, Logan County, AR, Lonoke County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Yell County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Lamar County, TX, Montague County, TX, Parker County, TX, Red River County, TX, Tarrant County, TX, Wise County, TX

The radar

The Western Arkansas radar (KSRX), 98 km from the middle of the area, began a volume at 04:54 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

Norman, OK (KOUN), launched 00:00Z, 4.9 hours before the alert went out and 290 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: 413 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 343 m²/s²
0-3 km storm-relative helicity: 360 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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
Feb 11, 9:48 PM CST	Severe Thunderstorm Watch	SPC	Clark, Cleburne, Conway, Faulkner, Garland, Grant and 28 more	4 hr
Feb 11, 11:51 PM CST	Mesoscale Discussion	SPC	Baxter, Clay, Craighead, Fulton, Greene, Independence and 6 more	5 hr
Feb 12, 1:17 AM CST	Mesoscale Discussion	SPC	Calhoun, Clark, Cleveland, Columbia, Conway, Dallas and 25 more	88 min
Feb 11, 7:57 PM CST	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 15 more	6 hr
Feb 12, 7:50 AM CST	Mesoscale Discussion	SPC	Angelina, Austin, Brazos, Burleson, Grimes, Hardin and 17 more	55 min
Feb 12, 9:53 AM CST	Mesoscale Discussion	SPC	Jasper, Newton	67 min
Feb 12, 10:25 AM CST	Tornado Watch	SPC	Jasper, Jefferson, Newton, Orange	7 hr
Feb 12, 12:40 PM CST	Mesoscale Discussion	SPC	Jefferson, Orange	65 min

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Texas, 2008 Mesoscale Discussions in Oklahoma, 2008 Every mesoscale discussion in 2008

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.