Alert archive / Missouri / Mesoscale Discussions in 2005

Mesoscale Discussion 633

April 21, 2005Atchison County, Kansas; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 4:51 PM CDT for Atchison County, Kansas; 4 counties in Missouri. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2005, 4:51 PM CDT (21:51 UTC)
Expired: Apr 21, 2005, 5:45 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Atchison County, KS, Buchanan County, MO, Clay County, MO, Clinton County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 94 km from the middle of the area, began a volume at 21:54 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.

Severe Thunderstorm Watch 183Apr 21, 6:45 PM CDT

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 9.9 hours before the alert went out and 87 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: 626 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

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 20, 7:25 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Logan, Norton, Rawlins and 4 more	95 min
Apr 20, 9:29 PM CDT	Mesoscale Discussion	SPC	Clay, Cloud, Dickinson, Geary, Jackson, Jewell and 13 more	61 min
Apr 20, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Clay, Cloud, Dickinson, Douglas and 21 more	7 hr
Apr 20, 9:51 PM CDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Edwards, Ford, Kingman and 4 more	84 min
Apr 20, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Cheyenne, Decatur, Rawlins	6 hr
Apr 20, 11:50 PM CDT	Mesoscale Discussion	SPC	Brown, Clay, Cloud, Ellis, Geary, Jackson and 15 more	85 min
Apr 21, 12:48 AM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more	57 min
Apr 21, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more	4 hr
Apr 21, 3:34 AM CDT	Mesoscale Discussion	SPC	Brown, Doniphan	116 min
Apr 21, 11:13 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 4 more	2 hr
Apr 21, 11:35 AM CDT	Tornado Watch	SPC	Clay, Cloud, Jackson, Jewell, Marshall, Nemaha and 4 more	5 hr
Apr 21, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	Bourbon, Cherokee, Crawford, Linn	5 hr
Apr 21, 1:48 PM CDT	Mesoscale Discussion	SPC	Atchison, Jackson, Marshall, Nemaha, Pottawatomie, Riley and 1 more	87 min
Apr 21, 3:05 PM CDT	Mesoscale Discussion	SPC	Anderson, Atchison, Brown, Doniphan, Douglas, Franklin and 11 more	85 min
Apr 21, 3:35 PM CDT	Tornado Watch	SPC	Anderson, Atchison, Brown, Doniphan, Douglas, Franklin and 11 more	7 hr
Apr 21, 5:52 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 5 more	53 min
Apr 21, 6:10 PM CDT	Tornado Watch	SPC	Bourbon, Cherokee, Crawford, Linn	7 hr
Apr 21, 6:51 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Franklin, Jackson and 7 more	84 min
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, 1:23 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 22 more	67 min
Apr 21, 3:28 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 14 more	92 min
Apr 21, 5:14 PM CDT	Mesoscale Discussion	SPC	McDonald	2 hr
Apr 21, 5:22 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Madison and 8 more	53 min
Apr 21, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Iron and 11 more	7 hr
Apr 21, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Boone, Caldwell, Callaway, Carroll, Chariton and 21 more	6 hr

Nearby

Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Kansas, 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.