Alert archive / Missouri / Tornado Watches in 2018

Tornado Watch 138

May 31, 20184 states

The Storm Prediction Center issued this tornado watch at May 31, 2018, 1:57 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 31, 2018, 1:57 PM CDT (18:57 UTC)
Expired
May 31, 2018, 8:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 68 counties

Clay County, AR, Greene County, AR, Lawrence County, AR, Randolph County, AR, Alexander County, IL, Franklin County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Webster County, KY, Barry County, MO, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Christian County, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Dunklin County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Laclede County, MO, Lawrence County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Ozark County, MO, Pemiscot County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 144 km from the middle of the area, began a volume at 18:57 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
70%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 31, 2:36 PM CDTSevere Thunderstorm WarningPAHAlexander39 min
May 31, 3:00 PM CDTFlash Flood WarningPAHBallard, McCracken3 hr
May 31, 3:13 PM CDTSevere Thunderstorm WarningPAHBallard, McCracken62 min
May 31, 3:45 PM CDTSevere Thunderstorm WarningPAHMassac60 min
May 31, 4:05 PM CDTSevere Thunderstorm WarningPAHMassac, Pope55 min
May 31, 4:08 PM CDTSevere Thunderstorm WarningSGFChristian, Stone, Taney52 min
May 31, 4:10 PM CDTSevere Thunderstorm WarningSGFHowell, Shannon, Texas50 min
May 31, 4:22 PM CDTSevere Thunderstorm WarningSGFHowell53 min
May 31, 4:30 PM CDTSevere Thunderstorm WarningPAHChristian, Trigg30 min
May 31, 4:34 PM CDTSevere Thunderstorm WarningPAHMassac26 min
May 31, 4:42 PM CDTSevere Thunderstorm WarningSGFOzark, Taney48 min
May 31, 4:45 PM CDTTornado WarningSGFOregon, Shannon30 min
May 31, 4:47 PM CDTSevere Thunderstorm WarningPAHMassac28 min
May 31, 4:49 PM CDTSevere Thunderstorm WarningPAHCarter41 min
May 31, 4:55 PM CDTFlash Flood WarningPAHChristian, Muhlenberg, Todd3 hr
May 31, 5:01 PM CDTSevere Thunderstorm WarningSGFHowell, Oregon44 min
May 31, 5:03 PM CDTSevere Thunderstorm WarningPAHChristian, Todd27 min
May 31, 5:14 PM CDTFlash Flood WarningPAHCarter3 hr
May 31, 5:23 PM CDTSevere Thunderstorm WarningSGFOzark, Taney33 min
May 31, 5:27 PM CDTSevere Thunderstorm WarningPAHCarter48 min
May 31, 5:33 PM CDTSevere Thunderstorm WarningSGFShannon, Texas42 min
May 31, 5:39 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds36 min
May 31, 5:45 PM CDTSevere Thunderstorm WarningSGFOregon24 min
May 31, 6:08 PM CDTSevere Thunderstorm WarningSGFOzark, Taney52 min
May 31, 6:16 PM CDTSevere Thunderstorm WarningSGFWright44 min
May 31, 6:19 PM CDTSevere Thunderstorm WarningSGFShannon41 min
May 31, 6:21 PM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Taney39 min
May 31, 6:27 PM CDTSevere Thunderstorm WarningSGFDouglas, Wright48 min
May 31, 6:32 PM CDTSevere Thunderstorm WarningSGFDent, Shannon, Texas43 min
May 31, 6:36 PM CDTTornado WarningSGFDent24 min
May 31, 6:43 PM CDTTornado WarningSGFDent, Texas32 min
May 31, 6:49 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds41 min
May 31, 6:58 PM CDTSevere Thunderstorm WarningSGFDouglas, Ozark, Taney28 min
May 31, 7:00 PM CDTSevere Thunderstorm WarningSGFShannon18 min
May 31, 7:03 PM CDTSevere Thunderstorm WarningLSXCrawford, Iron, Washington57 min
May 31, 7:03 PM CDTTornado WarningSGFDent, Shannon, Texas27 min
May 31, 7:08 PM CDTSevere Thunderstorm WarningSGFOzark, Taney52 min
May 31, 7:10 PM CDTFlash Flood WarningSGFOzark, Taney4 hr
May 31, 7:14 PM CDTSevere Thunderstorm WarningSGFBarry, Stone14 min
May 31, 7:16 PM CDTFlash Flood WarningSGFShannon4 hr
May 31, 7:17 PM CDTSevere Thunderstorm WarningPAHJohnson, Saline, Williamson12 min
May 31, 7:19 PM CDTSevere Thunderstorm WarningSGFDent26 min
May 31, 7:24 PM CDTSevere Thunderstorm WarningSGFDent, Shannon51 min
May 31, 7:28 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds32 min
May 31, 7:33 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois, Washington35 min
May 31, 7:35 PM CDTSevere Thunderstorm WarningSGFTexas40 min
May 31, 7:40 PM CDTSevere Thunderstorm WarningSGFDouglas, Texas, Wright50 min
May 31, 7:44 PM CDTTornado WarningPAHUnion31 min
May 31, 7:55 PM CDTSevere Thunderstorm WarningSGFDent, Shannon, Texas50 min
May 31, 7:57 PM CDTSevere Thunderstorm WarningLSXIron, Washington12 min
May 31, 7:57 PM CDTFlash Flood WarningSGFDouglas, Wright4 hr
May 31, 7:57 PM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Webster, Wright13 min
May 31, 7:59 PM CDTSevere Thunderstorm WarningSGFShannon11 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, 7.0 hours before the alert went out and 184 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2018-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 133 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2018-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -216 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
133 J/kg
Mixed-layer CIN
-299 J/kg
Mixed-layer LCL
880 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-216 m²/s²
0-3 km storm-relative helicity
-160 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

712 
WWUS20 KWNS 311855
SEL8  
SPC WW 311855
ARZ000-ILZ000-MOZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 138
NWS Storm Prediction Center Norman OK
200 PM CDT Thu May 31 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern Arkansas
  Southwest Illinois
  Southern Missouri

* Effective this Thursday afternoon and evening from 200 PM until
  800 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Widespread large hail and isolated very large hail events to 2.5
    inches in diameter likely
  Scattered damaging wind gusts to 70 mph likely

SUMMARY...Thunderstorms are expected to form over southern Missouri
this afternoon and track eastward across the watch area.  Intense
storms capable of very large hail, damaging winds, and isolated
tornadoes will be possible.

The tornado watch area is approximately along and 55 statute miles
north and south of a line from 30 miles southwest of Springfield MO
to 35 miles southeast of Carbondale IL. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 136...WW 137...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 28030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 31, 2:59 AM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 3 more61 min
May 31, 12:24 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clay, Fulton and 4 more96 min
May 31, 4:42 PM CDTMesoscale DiscussionSPCClay, Randolph2 hr
May 31, 5:46 PM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Fulton, Greene, Independence and 8 more2 hr
May 31, 10:16 AM CDTMesoscale DiscussionSPCClay, Crawford, Edwards, Effingham, Gallatin, Hamilton and 9 more119 min
May 31, 10:31 AM CDTSevere Thunderstorm WatchSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 8 more6 hr
May 31, 11:26 AM CDTMesoscale DiscussionSPCAnderson, Bath, Bell, Bourbon, Boyle, Breathitt and 39 more64 min
May 31, 1:05 PM CDTMesoscale DiscussionSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 25 more85 min
May 31, 1:30 PM CDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more3 hr
May 31, 2:29 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Clinton, Cumberland, Edmonson and 9 more91 min
May 31, 2:56 PM CDTMesoscale DiscussionSPCAnderson, Bath, Bourbon, Boyle, Bracken, Breathitt and 37 more64 min
May 31, 3:27 PM CDTMesoscale DiscussionSPCBell, Clinton, Harlan, Knox, Leslie, Letcher and 3 more93 min
May 31, 3:44 PM CDTMesoscale DiscussionSPCBracken, Lewis, Mason91 min
May 31, 4:31 PM CDTMesoscale DiscussionSPCBell, Clinton, Cumberland, McCreary, Russell, Wayne and 1 more59 min

Nearby

Tornado Watches in Missouri, 2018Tornado Watches in Kentucky, 2018Tornado Watches in Illinois, 2018Every tornado watch in 2018

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.