Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 546

April 15, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2012, 9:25 AM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2012, 9:25 AM CDT (14:25 UTC)
Expired: Apr 15, 2012, 11:00 AM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 59 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Christian County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Laclede County, MO, Ozark County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, LeFlore County, OK, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Hopkins County, TX, Lamar County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 48 km from the middle of the area, began a volume at 14:26 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 177Apr 15, 10:55 AM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 2.4 hours before the alert went out and 188 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: 31 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 855 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 381 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 15, 6:35 AM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Madison, Sebastian, Washington	85 min
Apr 15, 6:38 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	4 hr
Apr 15, 10:51 AM CDT	Tornado Watch	SPC	Baxter, Boone, Carroll, Conway, Crawford, Franklin and 18 more	7 hr
Apr 15, 1:38 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Conway, Crawford, Franklin and 18 more	97 min
Apr 15, 3:44 PM CDT	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Hempstead, Lafayette, Miller and 3 more	91 min
Apr 15, 4:22 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clay, Cleburne, Cleveland and 29 more	83 min
Apr 15, 4:25 PM CDT	Tornado Watch	SPC	Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 49 more	6 hr
Apr 14, 11:28 PM CDT	Mesoscale Discussion	SPC	Putnam	92 min
Apr 14, 11:48 PM CDT	Mesoscale Discussion	SPC	Clay, Platte	87 min
Apr 15, 1:37 AM CDT	Tornado Watch	SPC	Andrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 2 more	5 hr
Apr 15, 4:32 AM CDT	Mesoscale Discussion	SPC	Bates, Buchanan, Caldwell, Cass, Clay, Clinton and 6 more	88 min
Apr 15, 4:42 PM CDT	Tornado Watch	SPC	Audrain, Boone, Butler, Callaway, Carter, Cole and 35 more	6 hr
Apr 14, 7:15 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Grant, Major	60 min
Apr 14, 10:29 PM CDT	Severe Thunderstorm Watch	SPC	Comanche, Cotton, Tillman	6 hr
Apr 14, 10:11 PM CDT	Mesoscale Discussion	SPC	Borden, Childress, Collingsworth, Cottle, Crosby, Dawson and 17 more	34 min
Apr 15, 6:29 PM CDT	Mesoscale Discussion	SPC	Refugio, San Patricio	91 min

Nearby

Mesoscale Discussions in Arkansas, 2012 Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Missouri, 2012 Every mesoscale discussion in 2012

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.