Alert archive / Missouri / Mesoscale Discussions in 2019

Mesoscale Discussion 723

May 21, 20196 counties in Arkansas; 12 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 21, 2019, 1:51 PM CDT for 6 counties in Arkansas; 12 counties in Missouri. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 21, 2019, 1:51 PM CDT (18:51 UTC)
Expired: May 21, 2019, 3:15 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Baxter County, AR, Boone County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Searcy County, AR, Camden County, MO, Dent County, MO, Douglas County, MO, Laclede County, MO, Maries County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 91 km from the middle of the area, began a volume at 18:55 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 207May 21, 3:10 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.9 hours before the alert went out and 118 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 10:30 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Madison and 4 more	60 min
May 20, 11:06 PM CDT	Mesoscale Discussion	SPC	Benton	24 min
May 21, 12:18 AM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more	5 hr
May 21, 12:55 AM CDT	Mesoscale Discussion	SPC	Clay, Fulton, Randolph	95 min
May 21, 5:09 AM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	9 hr
May 21, 7:26 AM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Little River, Polk, Scott, Sebastian and 2 more	94 min
May 21, 9:57 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clark, Cleburne, Conway and 26 more	93 min
May 21, 11:32 AM CDT	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Faulkner, Fulton and 19 more	7 hr
May 21, 4:43 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Cross, Greene, Jackson, Lawrence and 3 more	62 min
May 20, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Camden, Dent, Hickory, Howell, Laclede and 10 more	8 hr
May 21, 3:10 PM CDT	Tornado Watch	SPC	Audrain, Bollinger, Boone, Butler, Callaway, Cape Girardeau and 32 more	8 hr
May 21, 5:43 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Crawford, Franklin and 20 more	62 min
May 21, 6:12 PM CDT	Mesoscale Discussion	SPC	Saint Charles, Saint Louis, City of Saint Louis	33 min
May 21, 6:53 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Holt	3 hr

Nearby

Mesoscale Discussions in Missouri, 2019 Mesoscale Discussions in Arkansas, 2019 Every mesoscale discussion in 2019

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.