Alert archive / Missouri / Tornado Watches in 2009

Tornado Watch 719

August 19, 20094 states

The Storm Prediction Center issued this tornado watch at Aug 19, 2009, 8:48 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 19, 2009, 8:48 PM CDT (01:48 UTC)
Expired: Aug 20, 2009, 4:00 AM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 40 counties

Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Barry County, MO, Barton County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Polk County, MO, Stone County, MO, Taney County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Ottawa County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Springfield radar (KSGF), 106 km from the middle of the area, began a volume at 01:50 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: 30%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 19, 9:00 PM CDT	Severe Thunderstorm Warning	SGF	Cherokee, Crawford	45 min
Aug 19, 9:04 PM CDT	Severe Thunderstorm Warning	ICT	Labette, Montgomery	56 min
Aug 19, 9:13 PM CDT	Severe Thunderstorm Warning	ICT	Labette	29 min
Aug 19, 9:21 PM CDT	Severe Thunderstorm Warning	SGF	Cherokee	54 min
Aug 19, 9:31 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	44 min
Aug 19, 9:45 PM CDT	Severe Thunderstorm Warning	SGF	Cherokee, Crawford	45 min
Aug 19, 9:50 PM CDT	Severe Thunderstorm Warning	ICT	Labette	55 min
Aug 19, 9:50 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Cedar, Dade, Jasper, Lawrence, Newton	55 min
Aug 19, 10:11 PM CDT	Flash Flood Warning	SGF	Cherokee	6 hr
Aug 19, 10:13 PM CDT	Tornado Warning	SGF	Dade, Lawrence	32 min
Aug 19, 10:13 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	62 min
Aug 19, 10:15 PM CDT	Severe Thunderstorm Warning	SGF	Cherokee	45 min
Aug 19, 10:23 PM CDT	Severe Thunderstorm Warning	SGF	Cedar, Hickory, Polk, St. Clair, Vernon	67 min
Aug 19, 10:28 PM CDT	Flash Flood Warning	SGF	Jasper	6 hr
Aug 19, 10:29 PM CDT	Severe Thunderstorm Warning	SGF	Cherokee	31 min
Aug 19, 10:32 PM CDT	Severe Thunderstorm Warning	SGF	Cedar, Christian, Dade, Greene, Lawrence, Polk and 1 more	73 min
Aug 19, 10:35 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	40 min
Aug 19, 10:59 PM CDT	Tornado Warning	SGF	McDonald, Newton	46 min
Aug 19, 11:07 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Christian, Dallas, Douglas, Greene, Laclede and 3 more	68 min
Aug 19, 11:22 PM CDT	Severe Thunderstorm Warning	SGF	Lawrence, Newton	53 min
Aug 19, 11:29 PM CDT	Flash Flood Warning	SGF	Crawford	6 hr
Aug 19, 11:37 PM CDT	Tornado Warning	SGF	Camden, Laclede	14 min
Aug 19, 11:47 PM CDT	Tornado Warning	SGF	Barry, McDonald	43 min
Aug 19, 11:48 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Laclede, Phelps, Pulaski, Shannon, Texas and 1 more	72 min
Aug 19, 11:57 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	48 min
Aug 20, 12:02 AM CDT	Severe Thunderstorm Warning	SGF	Crawford	41 min
Aug 20, 12:30 AM CDT	Flash Flood Warning	SGF	Barry, Stone	6 hr
Aug 20, 12:31 AM CDT	Severe Thunderstorm Warning	SGF	Stone	29 min
Aug 20, 12:37 AM CDT	Severe Thunderstorm Warning	SGF	Barry, Stone	23 min
Aug 20, 12:37 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	23 min
Aug 20, 12:39 AM CDT	Flash Flood Warning	SGF	Lawrence	6 hr
Aug 20, 12:58 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Nowata, Rogers, Tulsa	36 min
Aug 20, 1:00 AM CDT	Severe Thunderstorm Warning	SGF	Stone, Taney	60 min
Aug 20, 1:02 AM CDT	Severe Thunderstorm Warning	ICT	Labette	58 min
Aug 20, 1:05 AM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	40 min
Aug 20, 1:29 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	31 min
Aug 20, 1:39 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okmulgee, Wagoner	35 min
Aug 20, 1:44 AM CDT	Flash Flood Warning	SGF	McDonald, Newton	5 hr
Aug 20, 1:52 AM CDT	Severe Thunderstorm Warning	SGF	Newton	27 min
Aug 20, 1:59 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Nowata, Ottawa	46 min
Aug 20, 2:43 AM CDT	Severe Thunderstorm Warning	TSA	Delaware, Ottawa	34 min
Aug 20, 2:50 AM CDT	Severe Thunderstorm Warning	SGF	McDonald	55 min
Aug 20, 3:03 AM CDT	Severe Thunderstorm Warning	TSA	Benton	57 min
Aug 20, 3:31 AM CDT	Tornado Warning	TSA	Benton	29 min
Aug 20, 3:57 AM CDT	Flash Flood Warning	SGF	Cherokee, Crawford	2 hr
Aug 20, 4:00 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	9 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, 1.8 hours before the alert went out and 66 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: 14 J/kg
Mixed-layer CIN: -250 J/kg
Mixed-layer LCL: 1306 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 363 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 11:11 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Fulton	64 min
Aug 19, 11:26 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Fulton, Marion	9 hr
Aug 20, 1:47 AM CDT	Mesoscale Discussion	SPC	Benton	88 min
Aug 20, 2:32 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 1 more	88 min
Aug 20, 3:08 PM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more	7 hr
Aug 19, 7:11 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Brown, Butler, Chase, Clay and 37 more	8 hr
Aug 19, 8:14 PM CDT	Mesoscale Discussion	SPC	Bourbon, Cherokee, Crawford	61 min
Aug 19, 9:18 PM CDT	Mesoscale Discussion	SPC	Barber, Harper, Sumner	27 min
Aug 19, 10:25 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Brown, Butler, Chase, Clay and 33 more	95 min
Aug 20, 2:18 AM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 18 more	87 min
Aug 20, 1:10 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Custer and 14 more	95 min

Nearby

Tornado Watches in Missouri, 2009 Tornado Watches in Oklahoma, 2009 Tornado Watches in Kansas, 2009 Every tornado watch in 2009

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.