Alert archive / Missouri / Mesoscale Discussions in 2005

Mesoscale Discussion 635

April 21, 20055 states

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 5:22 PM CDT for 5 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2005, 5:22 PM CDT (22:22 UTC)
Expired: Apr 21, 2005, 6:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 43 counties

Clay County, AR, Greene County, AR, Lawrence County, AR, Randolph County, AR, Sharp County, AR, Alexander County, IL, Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Reynolds County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Lake County, TN, Obion County, TN

The radar

The Paducah radar (KPAH), 88 km from the middle of the area, began a volume at 22:25 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

Little Rock, AR (KLZK), launched 12:00Z, 10.4 hours before the alert went out and 230 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: 678 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 101 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, 1:23 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Madison, Marion, Washington	67 min
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, 5:35 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 20, 7:03 PM CDT	Mesoscale Discussion	SPC	Brown, Cass, Fulton, Hancock, Henderson, Henry and 12 more	87 min
Apr 21, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calhoun, Cass, Clinton, Greene and 13 more	6 hr
Apr 21, 3:28 PM CDT	Mesoscale Discussion	SPC	Adams, Monroe, Pike	92 min
Apr 21, 5:52 PM CDT	Mesoscale Discussion	SPC	Calhoun, Jersey, Madison, Monroe, Saint Clair	53 min
Apr 21, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Clinton, Franklin, Greene, Hamilton and 10 more	6 hr
Apr 21, 1:46 PM CDT	Mesoscale Discussion	SPC	Pike	119 min
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, 3:05 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 11 more	85 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, 6:10 PM CDT	Tornado Watch	SPC	Barry, Barton, Camden, Cedar, Christian, Crawford and 27 more	7 hr
Apr 21, 6:51 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Cass, Clay and 12 more	84 min

Nearby

Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Kentucky, 2005 Mesoscale Discussions in Illinois, 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.