Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 730

April 25, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 2:15 PM CDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2008, 2:15 PM CDT (19:15 UTC)
Expired: Apr 25, 2008, 3:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 58 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Camden County, MO, Christian County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Laclede County, MO, Maries County, MO, Miller County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Camp County, TX, Delta County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 30 km from the middle of the area, began a volume at 19:16 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.

Severe Thunderstorm Watch 233Apr 25, 3:25 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.3 hours before the alert went out and 164 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: 597 J/kg
Mixed-layer CIN: -378 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 457 m²/s²
0-3 km storm-relative helicity: 379 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 25, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Little River, Miller, Nevada, Sevier	7 hr
Apr 25, 5:05 PM CDT	Mesoscale Discussion	SPC	Clark, Hempstead, Hot Spring, Howard, Little River, Miller and 5 more	55 min
Apr 25, 6:40 PM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Faulkner, Fulton, Garland, Grant and 16 more	65 min
Apr 25, 12:07 AM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 5 more	7 hr
Apr 25, 12:55 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Holt, Nodaway	35 min
Apr 25, 1:13 AM CDT	Tornado Watch	SPC	Andrew, Atchison, Holt, Nodaway	5 hr
Apr 25, 2:24 AM CDT	Mesoscale Discussion	SPC	Andrew, Daviess, DeKalb, Gentry, Grundy, Harrison and 3 more	66 min
Apr 25, 3:18 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Holt, Nodaway	57 min
Apr 25, 4:22 AM CDT	Mesoscale Discussion	SPC	Adair, Clark, Daviess, DeKalb, Gentry, Grundy and 11 more	23 min
Apr 25, 4:51 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Boone, Clark, Knox, Lewis and 12 more	5 hr
Apr 25, 6:38 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cass, Cedar, Clay and 16 more	67 min
Apr 25, 12:21 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Boone, Callaway, Clark, Cooper and 14 more	54 min
Apr 25, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Boone, Callaway, Clark, Cole, Crawford and 20 more	7 hr
Apr 25, 3:41 PM CDT	Tornado Watch	SPC	Clark	4 hr
Apr 25, 4:50 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Burnet, Coryell, Edwards and 15 more	55 min
Apr 25, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more	6 hr

Nearby

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