Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 681

May 17, 201524 counties in Arkansas; 26 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 17, 2015, 1:43 AM CDT for 24 counties in Arkansas; 26 counties in Missouri. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 17, 2015, 1:43 AM CDT (06:43 UTC)
Expired: May 17, 2015, 3:15 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 50 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Izard 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, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Yell County, AR, Barry County, MO, Benton County, MO, Camden County, MO, Christian County, MO, Cole County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Laclede County, MO, Lawrence County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 187May 17, 2:05 AM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.7 hours before the alert went out and 70 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: 1727 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1056 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 11.8

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 16, 8:42 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	8 hr
May 17, 2:06 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 10 more	5 hr
May 17, 4:27 AM CDT	Mesoscale Discussion	SPC	Baxter, Cleburne, Conway, Faulkner, Fulton, Independence and 11 more	93 min
May 17, 6:25 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 10 more	65 min
May 16, 8:31 PM CDT	Mesoscale Discussion	SPC	Andrew, Bates, Buchanan, Caldwell, Carroll, Cass and 15 more	89 min
May 16, 10:21 PM CDT	Tornado Watch	SPC	Barry, Barton, Benton, Cedar, Christian, Dade and 11 more	5 hr
May 16, 10:27 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Bates, Caldwell, Carroll, Cass, Chariton and 15 more	4 hr

Nearby

Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Arkansas, 2015 Every mesoscale discussion in 2015

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.