Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 586

April 25, 200718 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2007, 2:46 PM CDT for 18 counties in Arkansas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2007, 2:46 PM CDT (19:46 UTC)
Expired: Apr 25, 2007, 3:45 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Baxter County, AR, Boone County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Perry County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR

The radar

The Western Arkansas radar (KSRX), 105 km from the middle of the area, began a volume at 19:50 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 189Apr 25, 3:40 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.8 hours before the alert went out and 149 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: -301 J/kg
Mixed-layer LCL: 1406 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 222 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
Apr 24, 7:33 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Clark, Crawford, Franklin, Hempstead and 15 more	117 min
Apr 24, 9:10 PM CDT	Tornado Watch	SPC	Baxter, Boone, Clark, Cleburne, Conway, Dallas and 26 more	4 hr
Apr 24, 10:05 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Jackson and 4 more	85 min
Apr 24, 10:07 PM CDT	Mesoscale Discussion	SPC	Little River, Miller, Sevier	83 min
Apr 24, 10:35 PM CDT	Tornado Watch	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more	5 hr
Apr 24, 10:53 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	3 hr
Apr 24, 11:58 PM CDT	Mesoscale Discussion	SPC	Clark, Dallas, Garland, Grant, Hempstead, Hot Spring and 15 more	92 min
Apr 25, 12:45 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 2 more	90 min
Apr 25, 2:10 AM CDT	Mesoscale Discussion	SPC	Columbia, Union	65 min
Apr 25, 12:30 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Washington	60 min
Apr 25, 1:11 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll	8 hr
Apr 25, 3:38 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	6 hr
Apr 25, 6:15 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Lafayette, Nevada, Ouachita	90 min
Apr 25, 6:38 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Conway, Faulkner, Fulton and 17 more	97 min

Nearby

Mesoscale Discussions in Arkansas, 2007 Every mesoscale discussion in 2007

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.