Alert archive / Missouri / Tornado Watches in 2024

Tornado Watch 71

April 1, 202412 counties in Illinois; 37 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 1, 2024, 10:37 PM CDT for 12 counties in Illinois; 37 counties in Missouri. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 1, 2024, 10:37 PM CDT (03:37 UTC)
Expired
Apr 2, 2024, 3:00 AM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
65 kt
All 49 counties

Bond County, IL, Clinton County, IL, Fayette County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Barry County, MO, Camden County, MO, Christian County, MO, City of Saint Louis, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Madison County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Newton County, MO, Osage County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 143 km from the middle of the area, began a volume at 03:41 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
50%
One or more EF2 to EF5 tornadoes
40%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
70%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 1, 10:41 PM CDTSevere Thunderstorm Warning Considerable damage threatSGFDallas, Greene, Laclede, Polk, Webster49 min
Apr 1, 10:45 PM CDTTornado WarningSGFDallas, Greene, Laclede, Polk, Webster30 min
Apr 1, 10:47 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis, City of Saint Louis58 min
Apr 1, 10:53 PM CDTSevere Thunderstorm WarningLSXFranklin49 min
Apr 1, 11:14 PM CDTTornado WarningSGFLaclede31 min
Apr 1, 11:17 PM CDTTornado WarningSGFLaclede28 min
Apr 1, 11:20 PM CDTSevere Thunderstorm WarningSGFCamden, Laclede, Phelps, Pulaski, Texas, Webster and 1 more40 min
Apr 1, 11:26 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair20 min
Apr 1, 11:28 PM CDTSevere Thunderstorm Warning Considerable damage threatSGFCamden, Maries, Miller, Phelps, Pulaski47 min
Apr 1, 11:34 PM CDTTornado WarningSGFLaclede, Phelps, Pulaski, Texas26 min
Apr 1, 11:38 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis, City of Saint Louis22 min
Apr 1, 11:59 PM CDTSevere Thunderstorm Warning Considerable damage threatSGFDent, Maries, Phelps, Pulaski46 min
Apr 2, 12:08 AM CDTTornado WarningSGFMaries, Phelps37 min
Apr 2, 12:12 AM CDTTornado WarningLSXCrawford, Franklin, Gasconade33 min
Apr 2, 12:25 AM CDTSevere Thunderstorm WarningLSXCrawford, Washington50 min
Apr 2, 12:39 AM CDTSevere Thunderstorm Warning Considerable damage threatSGFDent21 min
Apr 2, 12:40 AM CDTSevere Thunderstorm WarningSGFBarry, Stone50 min
Apr 2, 12:43 AM CDTTornado WarningLSXCrawford, Franklin, Gasconade, Washington47 min
Apr 2, 12:47 AM CDTFlash Flood WarningLSXSaint Louis6 hr
Apr 2, 12:48 AM CDTTornado WarningLSXCrawford, Franklin, Gasconade, Washington42 min
Apr 2, 1:03 AM CDTFlash Flood WarningLSXFranklin, Gasconade6 hr
Apr 2, 1:12 AM CDTSevere Thunderstorm WarningLSXMonroe48 min
Apr 2, 1:13 AM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Taney47 min
Apr 2, 1:18 AM CDTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair42 min
Apr 2, 1:27 AM CDTFlash Flood WarningLSXBond, Fayette, Montgomery6 hr
Apr 2, 1:32 AM CDTTornado WarningLSXMonroe28 min
Apr 2, 1:49 AM CDTTornado WarningLSXMonroe, Randolph26 min
Apr 2, 1:55 AM CDTSevere Thunderstorm WarningLSXRandolph50 min
Apr 2, 1:57 AM CDTSevere Thunderstorm Warning Considerable damage threatLSXClinton, Madison, Monroe, Saint Clair, Washington48 min
Apr 2, 2:10 AM CDTTornado WarningLSXRandolph50 min
Apr 2, 2:43 AM CDTFlash Flood WarningLSXMadison, Monroe, Saint Clair4 hr

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, 3.6 hours before the alert went out and 196 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 00:00Z on 2024-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 787 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 00:00Z on 2024-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.1939587897Sfc1 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
787 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 7:37 PM CDTMesoscale DiscussionSPCClark, Crawford, Edgar, Lawrence83 min
Apr 1, 11:26 PM CDTMesoscale DiscussionSPCBond, Clinton, Fayette, Madison, Marion, Monroe and 3 more94 min
Apr 2, 1:16 AM CDTMesoscale DiscussionSPCClay, Clinton, Crawford, Edwards, Franklin, Gallatin and 19 more89 min
Apr 2, 2:00 AM CDTTornado WatchSPCAlexander, Clay, Edwards, Franklin, Gallatin, Hamilton and 16 more5 hr
Apr 2, 10:58 AM CDTMesoscale DiscussionSPCCrawford, Edwards, Lawrence, Richland, Wabash, Wayne and 1 more3 hr
Apr 2, 11:48 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 9 more117 min
Apr 2, 12:08 PM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more6 hr
Apr 2, 2:28 PM CDTMesoscale DiscussionSPCHardin92 min
Apr 1, 8:02 PM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 10 more88 min

Nearby

Tornado Watches in Missouri, 2024Tornado Watches in Illinois, 2024Every tornado watch in 2024

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.