Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 736

April 25, 200822 counties in Arkansas; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 6:40 PM CDT for 22 counties in Arkansas; 7 counties in Missouri. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2008, 6:40 PM CDT (23:40 UTC)
Expired: Apr 25, 2008, 7:45 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 29 counties

Cleburne County, AR, Conway County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Lonoke County, AR, Montgomery County, AR, Perry County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Butler County, MO, Carter County, MO, Oregon County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Wayne County, MO

The radar

The Little Rock radar (KLZK), 90 km from the middle of the area, began a volume at 23:43 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

Springfield, MO (KSGF), launched 12:00Z, 11.7 hours before the alert went out and 209 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, 2:15 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Crawford, Franklin, Howard and 14 more	90 min
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, 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

Nearby

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.