Alert archive / Missouri / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 337

May 23, 201117 counties in Kansas; 40 counties in Missouri; 9 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at May 23, 2011, 6:08 AM CDT for 17 counties in Kansas; 40 counties in Missouri; 9 counties in Oklahoma. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 6:08 AM CDT (11:08 UTC)
Expired: May 23, 2011, 1:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 66 counties

Allen County, KS, Anderson County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Coffey County, KS, Cowley County, KS, Crawford County, KS, Elk County, KS, Greenwood County, KS, Labette County, KS, Linn County, KS, Miami County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cass County, MO, Cedar County, MO, Christian County, MO, Cooper County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howell County, MO, Jasper County, MO, Johnson County, MO, Laclede County, MO, Lawrence County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Morgan County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Pettis County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Shannon County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Craig County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Springfield radar (KSGF), 146 km from the middle of the area, began a volume at 11:10 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 23, 6:20 AM CDT	Severe Thunderstorm Warning	TSA	Osage	25 min
May 23, 6:26 AM CDT	Severe Thunderstorm Warning	ICT	Chautauqua, Elk, Montgomery, Wilson	44 min
May 23, 6:50 AM CDT	Severe Thunderstorm Warning	ICT	Montgomery	55 min
May 23, 6:50 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	25 min
May 23, 6:52 AM CDT	Severe Thunderstorm Warning	ICT	Labette, Montgomery, Neosho	53 min
May 23, 7:12 AM CDT	Severe Thunderstorm Warning	ICT	Labette	63 min
May 23, 7:25 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	50 min
May 23, 7:37 AM CDT	Severe Thunderstorm Warning	ICT	Montgomery	53 min
May 23, 7:42 AM CDT	Severe Thunderstorm Warning	SGF	Cherokee, Crawford	63 min
May 23, 8:06 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	39 min
May 23, 8:15 AM CDT	Severe Thunderstorm Warning	SGF	Cherokee	45 min
May 23, 8:16 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	44 min
May 23, 8:51 AM CDT	Severe Thunderstorm Warning	SGF	Barton, Cedar, St. Clair, Vernon	39 min
May 23, 8:56 AM CDT	Severe Thunderstorm Warning	SGF	Barry, Jasper, Lawrence, McDonald, Newton	49 min
May 23, 9:17 AM CDT	Severe Thunderstorm Warning	SGF	Cedar, Hickory, Polk, St. Clair	31 min
May 23, 9:38 AM CDT	Flash Flood Warning	SGF	Cherokee	8 hr
May 23, 9:43 AM CDT	Severe Thunderstorm Warning	SGF	Dallas, Hickory, Polk	18 min
May 23, 9:55 AM CDT	Severe Thunderstorm Warning	SGF	Camden, Dallas, Hickory, Laclede	36 min
May 23, 9:56 AM CDT	Flash Flood Warning	TSA	Craig, Delaware, Nowata, Ottawa	4 hr
May 23, 10:20 AM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis	25 min
May 23, 10:29 AM CDT	Severe Thunderstorm Warning	SGF	Camden, Dent, Laclede, Maries, Miller, Morgan and 3 more	45 min
May 23, 10:53 AM CDT	Severe Thunderstorm Warning	SGF	Dent, Maries, Miller, Phelps, Pulaski	44 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 11.1 hours before the alert went out and 130 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: 3961 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 641 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 3.7
Supercell composite: 15.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 7:52 PM CDT	Mesoscale Discussion	SPC	Cherokee, Crawford	53 min
May 23, 5:07 AM CDT	Mesoscale Discussion	SPC	Bourbon, Chautauqua, Cherokee, Cowley, Crawford, Elk and 6 more	113 min
May 23, 5:41 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Chautauqua, Cherokee, Crawford and 7 more	94 min
May 23, 7:38 AM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Chautauqua, Cherokee, Crawford, Labette and 3 more	97 min
May 23, 12:12 PM CDT	Mesoscale Discussion	SPC	Cherokee, Labette	93 min
May 23, 4:38 PM CDT	Mesoscale Discussion	SPC	Butler, Chase, Cowley, Elk, Greenwood, Harper and 6 more	97 min
May 22, 8:26 PM CDT	Tornado Watch	SPC	Barry, Bollinger, Butler, Cape Girardeau, Carter, Crawford and 33 more	8 hr
May 22, 8:47 PM CDT	Tornado Watch	SPC	Dunklin, Pemiscot	7 hr
May 22, 10:24 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Madison, Perry, Sainte Genevieve and 2 more	66 min
May 22, 11:46 PM CDT	Mesoscale Discussion	SPC	Dunklin, Pemiscot	89 min
May 23, 10:34 AM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bollinger, Butler, Camden, Carter and 37 more	86 min
May 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Audrain, Bollinger, Boone, Butler, Callaway, Cape Girardeau and 28 more	7 hr
May 23, 12:37 PM CDT	Mesoscale Discussion	SPC	City of Saint Louis	83 min
May 23, 1:16 PM CDT	Mesoscale Discussion	SPC	Butler, Dunklin, New Madrid, Pemiscot, Ripley	89 min
May 23, 1:34 PM CDT	Severe Thunderstorm Watch	SPC	Dunklin, Pemiscot	6 hr
May 23, 3:58 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Iron and 12 more	92 min
May 22, 8:10 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more	65 min
May 23, 9:14 AM CDT	Mesoscale Discussion	SPC	LeFlore, McCurtain, Pushmataha	91 min
May 23, 2:08 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more	97 min
May 23, 2:30 PM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more	8 hr
May 23, 5:07 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Coal, Creek, Delaware, Garvin and 21 more	23 min
May 23, 5:24 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Creek, Haskell, Latimer, LeFlore and 13 more	4 hr
May 23, 6:51 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more	84 min

Nearby

Severe Thunderstorm Watches in Missouri, 2011 Severe Thunderstorm Watches in Kansas, 2011 Severe Thunderstorm Watches in Oklahoma, 2011 Every severe thunderstorm watch in 2011

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.