Alert archive / Missouri / Mesoscale Discussions in 2005

Mesoscale Discussion 627

April 21, 20056 counties in Arkansas; 28 counties in Missouri; Adair County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 1:23 PM CDT for 6 counties in Arkansas; 28 counties in Missouri; Adair County, Oklahoma. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2005, 1:23 PM CDT (18:23 UTC)
Expired: Apr 21, 2005, 2:30 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 35 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Marion County, AR, Washington County, AR, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Miller County, MO, Morgan County, MO, Newton County, MO, Ozark County, MO, Polk County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Adair County, OK

The radar

The Springfield radar (KSGF), 48 km from the middle of the area, began a volume at 18:23 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.4 hours before the alert went out and 3 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: 780 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 93 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 21, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 6 more	5 hr
Apr 21, 5:14 PM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Franklin, Garland, Hot Spring, Howard and 11 more	2 hr
Apr 21, 5:22 PM CDT	Mesoscale Discussion	SPC	Clay, Greene, Lawrence, Randolph, Sharp	53 min
Apr 21, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Lawrence, Randolph, Sharp	7 hr
Apr 21, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more	7 hr
Apr 21, 3:34 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 4 more	116 min
Apr 21, 11:13 AM CDT	Mesoscale Discussion	SPC	Platte	2 hr
Apr 21, 12:15 PM CDT	Mesoscale Discussion	SPC	Boone, Callaway, Cole, Cooper, Crawford, Franklin and 12 more	2 hr
Apr 21, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Crawford, Franklin, Gasconade, Jefferson and 16 more	6 hr
Apr 21, 3:05 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 11 more	85 min
Apr 21, 3:28 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 14 more	92 min
Apr 21, 3:35 PM CDT	Tornado Watch	SPC	Andrew, Atchison, Bates, Benton, Buchanan, Caldwell and 19 more	7 hr
Apr 21, 4:51 PM CDT	Mesoscale Discussion	SPC	Buchanan, Clay, Clinton, Platte	54 min
Apr 21, 5:52 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Audrain, Boone, Buchanan, Caldwell and 38 more	53 min
Apr 21, 6:10 PM CDT	Tornado Watch	SPC	Barry, Barton, Camden, Cedar, Christian, Crawford and 27 more	7 hr
Apr 21, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Boone, Caldwell, Callaway, Carroll, Chariton and 21 more	6 hr
Apr 21, 6:51 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Cass, Clay and 12 more	84 min
Apr 20, 8:45 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Garfield and 9 more	90 min
Apr 20, 9:51 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Custer, Dewey, Ellis, Greer and 9 more	84 min

Nearby

Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Oklahoma, 2005 Every mesoscale discussion in 2005

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.