Alert archive / Missouri / Tornado Watches in 2017

Tornado Watch 275

May 27, 201767 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 27, 2017, 12:13 PM CDT for 67 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 27, 2017, 12:13 PM CDT (17:13 UTC)
Expired: May 27, 2017, 7:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 70 kt

All 67 counties

Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Bollinger County, MO, Boone County, MO, Butler County, MO, Callaway County, MO, Camden County, MO, Carter County, MO, Cass County, MO, Cedar County, MO, Christian County, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Howell County, MO, Iron County, MO, Jackson County, MO, Jasper County, MO, Jefferson County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lawrence County, MO, Madison County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Pettis County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Saline County, MO, Shannon County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 90 km from the middle of the area, began a volume at 17:16 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: 60%
One or more EF2 to EF5 tornadoes: 50%
Ten or more severe wind reports: 80%
One or more gusts of 65 knots or more: 60%
Ten or more severe hail reports: 90%
One or more hailstones of 2 inches or more: 70%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 27, 12:16 PM CDT	Severe Thunderstorm Warning	SGF	Phelps, Pulaski	44 min
May 27, 12:29 PM CDT	Severe Thunderstorm Warning	EAX	Bates	46 min
May 27, 12:31 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Washington	44 min
May 27, 12:41 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Phelps	49 min
May 27, 12:47 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Cedar, Dade, Vernon	43 min
May 27, 12:49 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Henry, Johnson, Lafayette	56 min
May 27, 12:55 PM CDT	Tornado Warning	LSX	Crawford	11 min
May 27, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	46 min
May 27, 1:15 PM CDT	Tornado Warning	EAX	Henry	30 min
May 27, 1:21 PM CDT	Tornado Warning	LSX	Cole, Osage	39 min
May 27, 1:22 PM CDT	Flash Flood Warning	SGF	Barton	4 hr
May 27, 1:25 PM CDT	Tornado Warning	SGF	Dent	35 min
May 27, 1:27 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Cedar, Dade, Polk, Vernon	48 min
May 27, 1:28 PM CDT	Severe Thunderstorm Warning	SGF	Benton, St. Clair	62 min
May 27, 1:30 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Jasper	45 min
May 27, 1:36 PM CDT	Severe Thunderstorm Warning	EAX	Henry, Johnson, Lafayette, Pettis, Saline	43 min
May 27, 1:39 PM CDT	Severe Thunderstorm Warning	LSX	Boone	37 min
May 27, 1:44 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	61 min
May 27, 1:47 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Dade, Jasper	28 min
May 27, 1:48 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	42 min
May 27, 1:52 PM CDT	Tornado Warning	LSX	Reynolds	38 min
May 27, 1:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, City of Saint Louis	23 min
May 27, 1:58 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve	51 min
May 27, 2:04 PM CDT	Severe Thunderstorm Warning	SGF	Benton, Camden, Hickory, Morgan	41 min
May 27, 2:06 PM CDT	Severe Thunderstorm Warning	SGF	Cedar, Dade, Dallas, Polk	39 min
May 27, 2:08 PM CDT	Severe Thunderstorm Warning	EAX	Cooper	52 min
May 27, 2:09 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Greene, Lawrence	51 min
May 27, 2:23 PM CDT	Tornado Warning	SGF	Camden, Miller, Morgan	37 min
May 27, 2:24 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	51 min
May 27, 2:24 PM CDT	Severe Thunderstorm Warning	PAH	Bollinger, Perry	36 min
May 27, 2:27 PM CDT	Tornado Warning	LSX	Reynolds	48 min
May 27, 2:33 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Dallas, Greene, Laclede, Polk, Webster	42 min
May 27, 2:41 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Maries, Miller, Morgan, Pulaski	49 min
May 27, 2:45 PM CDT	Tornado Warning	SGF	Dallas, Laclede	30 min
May 27, 2:56 PM CDT	Tornado Warning	SGF	Maries, Miller	34 min
May 27, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Osage	47 min
May 27, 2:59 PM CDT	Severe Thunderstorm Warning	PAH	Bollinger, Cape Girardeau, Perry	46 min
May 27, 3:00 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Dallas, Greene, Laclede, Phelps, Pulaski and 3 more	60 min
May 27, 3:04 PM CDT	Tornado Warning Tornado observed	SGF	Laclede	26 min
May 27, 3:10 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	54 min
May 27, 3:16 PM CDT	Tornado Warning	SGF	Laclede, Pulaski, Texas	29 min
May 27, 3:31 PM CDT	Severe Thunderstorm Warning	SGF	Maries	44 min
May 27, 3:34 PM CDT	Tornado Warning	SGF	Phelps, Pulaski, Texas	26 min
May 27, 3:35 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Montgomery, Osage, Warren	55 min
May 27, 3:37 PM CDT	Severe Thunderstorm Warning	LSX	Madison	53 min
May 27, 3:45 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Maries, Phelps, Pulaski, Shannon, Texas and 1 more	60 min
May 27, 3:49 PM CDT	Tornado Warning	SGF	Dent, Phelps, Texas	41 min
May 27, 4:06 PM CDT	Tornado Warning	LSX	Crawford, Iron, Reynolds, Washington	54 min
May 27, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	34 min
May 27, 4:19 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	56 min
May 27, 4:27 PM CDT	Severe Thunderstorm Warning	PAH	Bollinger, Wayne	48 min
May 27, 4:28 PM CDT	Severe Thunderstorm Warning	SGF	Shannon	32 min
May 27, 4:42 PM CDT	Severe Thunderstorm Warning	PAH	Wayne	33 min
May 27, 4:45 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Sainte Genevieve, Saint Francois	45 min
May 27, 4:49 PM CDT	Severe Thunderstorm Warning	PAH	Wayne	41 min
May 27, 5:09 PM CDT	Severe Thunderstorm Warning	SGF	Jasper	51 min
May 27, 5:10 PM CDT	Severe Thunderstorm Warning	PAH	Bollinger, Cape Girardeau, Perry, Scott, Stoddard	50 min
May 27, 5:22 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson	38 min
May 27, 5:26 PM CDT	Flash Flood Warning	PAH	Bollinger, Mississippi, Scott, Stoddard, Wayne	3 hr
May 27, 5:29 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Lawrence	46 min
May 27, 5:39 PM CDT	Severe Thunderstorm Warning	SGF	Newton	51 min
May 27, 5:45 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Maries, Miller, Pulaski	34 min
May 27, 5:55 PM CDT	Severe Thunderstorm Warning	SGF	Greene	50 min
May 27, 6:01 PM CDT	Severe Thunderstorm Warning	SGF	Jasper, Newton	44 min
May 27, 6:13 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis, Saline	35 min
May 27, 6:14 PM CDT	Severe Thunderstorm Warning	SGF	Christian, Greene, Lawrence, Stone	61 min
May 27, 6:15 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Laclede, Miller, Pulaski	45 min
May 27, 6:17 PM CDT	Severe Thunderstorm Warning	SGF	Dallas, Hickory, Polk	43 min
May 27, 6:23 PM CDT	Severe Thunderstorm Warning	SGF	Webster, Wright	52 min
May 27, 6:23 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Shannon, Texas	52 min
May 27, 6:29 PM CDT	Flash Flood Warning	SGF	Barry, Christian, Greene, Jasper, Lawrence, Newton	4 hr
May 27, 6:31 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Maries, Phelps, Pulaski	59 min
May 27, 6:40 PM CDT	Severe Thunderstorm Warning	SGF	Barry, Christian, Douglas, Greene, Lawrence, Stone and 2 more	50 min
May 27, 6:44 PM CDT	Severe Thunderstorm Warning	SGF	Newton	46 min
May 27, 6:45 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Greene, Polk	45 min
May 27, 6:56 PM CDT	Severe Thunderstorm Warning	SGF	Dallas, Laclede	27 min
May 27, 6:57 PM CDT	Severe Thunderstorm Warning	SGF	Laclede, Phelps, Pulaski, Texas	36 min
May 27, 6:58 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Shannon	32 min
May 27, 6:58 PM CDT	Severe Thunderstorm Warning	SGF	McDonald	47 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 12:00Z, 5.2 hours before the alert went out and 139 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: 3187 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 9.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 12:06 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Christian, Douglas, Howell, McDonald, Oregon and 4 more	5 hr
May 27, 2:04 AM CDT	Mesoscale Discussion	SPC	Barry, Christian, Douglas, Howell, McDonald, Oregon and 4 more	116 min
May 27, 3:54 AM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Carter, Dunklin, Howell, Mississippi and 9 more	2 hr
May 27, 4:19 AM CDT	Severe Thunderstorm Watch	SPC	Butler, Dunklin, New Madrid, Pemiscot, Ripley, Stoddard	6 hr
May 27, 6:12 AM CDT	Mesoscale Discussion	SPC	Dunklin, New Madrid, Pemiscot	2 hr
May 27, 9:59 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Boone, Callaway, Camden and 47 more	2 hr
May 27, 1:12 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Bollinger, Camden and 50 more	93 min
May 27, 1:16 PM CDT	Mesoscale Discussion	SPC	Cape Girardeau, Mississippi, New Madrid, Pemiscot, Perry, Scott and 1 more	59 min
May 27, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	Cape Girardeau, Dunklin, Mississippi, New Madrid, Pemiscot, Saint Charles and 4 more	7 hr
May 27, 3:29 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Carter, Crawford, Dent, Howell and 14 more	91 min
May 27, 3:50 PM CDT	Mesoscale Discussion	SPC	Mississippi, New Madrid, Pemiscot, Scott	85 min
May 27, 4:24 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Dent, Iron and 8 more	66 min
May 27, 5:13 PM CDT	Severe Thunderstorm Watch PDS	SPC	Cape Girardeau, Dunklin, Mississippi, New Madrid, Pemiscot, Scott and 1 more	7 hr
May 27, 5:56 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Callaway, Camden, Cole, Cooper and 18 more	64 min
May 27, 6:17 PM CDT	Mesoscale Discussion	SPC	Howell, Oregon, Ozark, Ripley, Taney	58 min
May 27, 6:26 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Benton, Boone, Callaway, Camden, Cedar and 28 more	3 hr

Nearby

Tornado Watches in Missouri, 2017 Every tornado watch in 2017

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.