Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 693

April 22, 200813 counties in Arkansas; 6 counties in Missouri; 23 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2008, 6:51 PM CDT for 13 counties in Arkansas; 6 counties in Missouri; 23 counties in Oklahoma. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2008, 6:51 PM CDT (23:51 UTC)
Expired: Apr 22, 2008, 8:45 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center

All 42 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Garland County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Christian County, MO, Greene County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Adair County, OK, Carter County, OK, Cherokee County, OK, Coal County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 63 km from the middle of the area, began a volume at 23:53 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 12:00Z, 11.9 hours before the alert went out and 213 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: 2707 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
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
Apr 22, 7:42 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 8 more	63 min
Apr 22, 7:49 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 10 more	6 hr
Apr 22, 10:12 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 31 more	93 min
Apr 22, 10:47 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 40 more	5 hr
Apr 22, 12:16 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Benton, Boone, Carroll, Clark and 48 more	89 min
Apr 22, 1:51 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more	54 min
Apr 22, 2:06 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	7 hr
Apr 22, 2:33 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 35 more	6 hr
Apr 22, 3:30 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Madison, Washington	90 min
Apr 22, 3:52 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 26 more	83 min
Apr 21, 7:03 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Buchanan, Clinton, DeKalb, Holt, Platte	7 hr
Apr 21, 10:38 PM CDT	Mesoscale Discussion	SPC	Andrew, Buchanan, Clinton, DeKalb, Holt, Platte	2 hr
Apr 22, 1:14 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Caldwell, Cass, Cedar, Clay and 10 more	91 min
Apr 22, 9:41 AM CDT	Mesoscale Discussion	SPC	Cape Girardeau, Perry, Scott	94 min
Apr 21, 7:34 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Creek, Garfield, Garvin, Kingfisher and 9 more	86 min
Apr 21, 8:56 PM CDT	Tornado Watch	SPC	Carter, Cleveland, Coal, Creek, Garvin, Hughes and 11 more	5 hr
Apr 21, 10:29 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Coal, Creek, Garvin, Hughes and 11 more	91 min

Nearby

Mesoscale Discussions in Oklahoma, 2008 Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Missouri, 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.