Alert archive / Missouri / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 224

June 26, 201816 counties in Illinois; 25 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2018, 2:22 PM CDT for 16 counties in Illinois; 25 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 26, 2018, 2:22 PM CDT (19:22 UTC)
Expired
Jun 26, 2018, 8:50 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 41 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Bollinger County, MO, Boone County, MO, Callaway County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Perry County, MO, Reynolds County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 106 km from the middle of the area, began a volume at 19:24 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
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 26, 2:33 PM CDTSevere Thunderstorm WarningLSXBoone, Cole, Moniteau42 min
Jun 26, 2:51 PM CDTSevere Thunderstorm WarningLSXIron, Madison, Sainte Genevieve, Saint Francois, Washington39 min
Jun 26, 3:01 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau, Osage44 min
Jun 26, 3:05 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds40 min
Jun 26, 3:22 PM CDTFlash Flood WarningLSXLincoln, Montgomery, Warren5 hr
Jun 26, 3:25 PM CDTSevere Thunderstorm WarningLSXMadison, Sainte Genevieve, Saint Francois20 min
Jun 26, 3:31 PM CDTSevere Thunderstorm WarningPAHBollinger, Cape Girardeau, Perry44 min
Jun 26, 3:34 PM CDTTornado WarningPAHPerry30 min
Jun 26, 3:39 PM CDTSevere Thunderstorm WarningLSXCallaway, Cole, Franklin, Gasconade, Montgomery, Osage and 1 more51 min
Jun 26, 3:44 PM CDTSevere Thunderstorm WarningLSXMadison46 min
Jun 26, 3:57 PM CDTSevere Thunderstorm WarningPAHBollinger33 min
Jun 26, 4:00 PM CDTSevere Thunderstorm WarningPAHJackson, Union45 min
Jun 26, 4:09 PM CDTTornado WarningLSXFranklin, Gasconade36 min
Jun 26, 4:19 PM CDTTornado WarningLSXFranklin26 min
Jun 26, 4:29 PM CDTSevere Thunderstorm WarningPAHUnion31 min
Jun 26, 4:35 PM CDTTornado WarningLSXFranklin40 min
Jun 26, 4:46 PM CDTSevere Thunderstorm WarningPAHJohnson, Union, Williamson29 min
Jun 26, 5:02 PM CDTTornado WarningLSXFranklin4 min
Jun 26, 5:44 PM CDTSevere Thunderstorm WarningPAHWayne46 min
Jun 26, 5:53 PM CDTSevere Thunderstorm WarningPAHHardin52 min
Jun 26, 6:15 PM CDTSevere Thunderstorm WarningPAHButler, Carter, Wayne30 min
Jun 26, 6:50 PM CDTSevere Thunderstorm WarningPAHAlexander, Union25 min
Jun 26, 6:54 PM CDTSevere Thunderstorm WarningPAHBollinger, Butler, Cape Girardeau, Scott, Stoddard, Wayne36 min
Jun 26, 7:08 PM CDTSevere Thunderstorm WarningPAHAlexander, Pulaski37 min
Jun 26, 7:15 PM CDTSevere Thunderstorm WarningPAHUnion30 min
Jun 26, 7:15 PM CDTSevere Thunderstorm WarningPAHButler, Mississippi, New Madrid, Scott, Stoddard30 min
Jun 26, 7:30 PM CDTSevere Thunderstorm WarningPAHJohnson, Massac, Pulaski, Union, Williamson30 min
Jun 26, 7:33 PM CDTSevere Thunderstorm WarningPAHAlexander27 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, 7.4 hours before the alert went out and 241 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 2018-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 710 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2018-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 326 square meters per square second.193958Sfc1 km3 km6 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
710 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
326 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 25, 8:08 PM CDTMesoscale DiscussionSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more2 hr
Jun 26, 2:19 AM CDTMesoscale DiscussionSPCMonroe116 min
Jun 26, 7:39 AM CDTMesoscale DiscussionSPCAlexander, Bond, Christian, Clark, Clay, Clinton and 39 more2 hr
Jun 26, 9:26 AM CDTSevere Thunderstorm WatchSPCEdwards, Gallatin, Hardin, Massac, Pope, Saline and 2 more5 hr
Jun 26, 1:31 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Jo Daviess, Kane and 5 more89 min
Jun 26, 1:53 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Jackson, Johnson, Perry, Pulaski and 3 more67 min
Jun 26, 12:16 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 10 more59 min
Jun 26, 12:35 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 31 more7 hr
Jun 26, 12:56 PM CDTMesoscale DiscussionSPCBarry, McDonald, Newton, Stone64 min
Jun 26, 1:26 PM CDTSevere Thunderstorm WatchSPCBarry, Christian, Douglas, Jasper, Lawrence, McDonald and 4 more6 hr
Jun 26, 2:46 PM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cass and 29 more89 min
Jun 26, 5:26 PM CDTSevere Thunderstorm WatchSPCButler, Carter, Dunklin, Mississippi, New Madrid, Pemiscot and 3 more6 hr
Jun 26, 6:49 PM CDTMesoscale DiscussionSPCHowell, Oregon, Ozark, Ripley116 min

Nearby

Severe Thunderstorm Watches in Missouri, 2018Severe Thunderstorm Watches in Illinois, 2018Every severe thunderstorm 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.