Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 859

May 22, 201115 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 3:10 PM CDT for 15 counties in Arkansas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: May 22, 2011, 3:10 PM CDT (20:10 UTC)
Expired: May 22, 2011, 4:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Baxter County, AR, Boone County, AR, Cleburne County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR

The radar

The Little Rock radar (KLZK), 111 km from the middle of the area, began a volume at 20:10 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 330May 22, 3:25 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.2 hours before the alert went out and 190 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: 2645 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 424 m²/s²
0-3 km storm-relative helicity: 422 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 16.9

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
May 21, 8:31 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 45 more	89 min
May 22, 5:18 AM CDT	Mesoscale Discussion	SPC	Arkansas, Calhoun, Clark, Cleburne, Cleveland, Conway and 32 more	57 min
May 22, 7:03 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 30 more	7 hr
May 22, 11:15 AM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 26 more	90 min
May 22, 1:06 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Marion	114 min
May 22, 1:09 PM CDT	Mesoscale Discussion	SPC	Arkansas, Crittenden, Cross, Grant, Jefferson, Lee and 7 more	66 min
May 22, 1:27 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	8 hr
May 22, 3:24 PM CDT	Tornado Watch	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 22 more	6 hr
May 22, 3:48 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Madison, Washington	117 min
May 22, 5:21 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clay, Cleburne, Conway and 22 more	54 min
May 22, 6:10 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Madison, Washington	65 min

Nearby

Mesoscale Discussions in Arkansas, 2011 Every mesoscale discussion in 2011

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.