Alert archive / Missouri / Tornado Watches in 2023

Tornado Watch 192

May 6, 2023Adams County, Brown County, Pike County, Illinois; 8 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 6, 2023, 9:00 PM CDT for Adams County, Brown County, Pike County, Illinois; 8 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2023, 9:00 PM CDT (02:00 UTC)
Expired
May 7, 2023, 1:43 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt

Counties Adams County, IL, Brown County, IL, Pike County, IL, Audrain County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 145 km from the middle of the area, began a volume at 02:02 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
50%
One or more gusts of 65 knots or more
20%
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
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 6, 10:15 PM CDTSevere Thunderstorm Warning Considerable damage threatLSXMonroe, Shelby27 min
May 6, 11:14 PM CDTSevere Thunderstorm WarningLSXShelby46 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

Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 225 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, Davenport, at 00:00Z on 2023-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 668 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, Davenport, at 00:00Z on 2023-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
668 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
1150 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 8:12 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Christian, Fulton, Greene and 22 more93 min
May 6, 8:50 PM CDTSevere Thunderstorm WatchSPCFulton, Hancock, Henderson, Knox, McDonough, Mercer and 2 more7 hr
May 6, 10:44 PM CDTSevere Thunderstorm WatchSPCCass, Champaign, Christian, Coles, Cumberland, DeWitt and 15 more6 hr
May 6, 11:34 PM CDTMesoscale DiscussionSPCBrown, Cass, Fulton, Hancock, Henderson, Knox and 11 more86 min
May 7, 1:37 AM CDTMesoscale DiscussionSPCFulton, Hancock, Henderson, Knox, McDonough, Mason and 3 more113 min
May 7, 2:21 AM CDTMesoscale DiscussionSPCClark, Coles, Cumberland, Moultrie114 min
May 7, 4:05 AM CDTMesoscale DiscussionSPCChristian, Clark, Coles, Crawford, Cumberland, Douglas and 7 more85 min
May 7, 1:00 PM CDTMesoscale DiscussionSPCAlexander, Bond, Christian, Clay, Clinton, Effingham and 30 more2 hr
May 7, 1:18 PM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Calhoun, Cass, Christian, Clay and 47 more10 hr
May 7, 3:40 PM CDTMesoscale DiscussionSPCBond, Cass, Christian, Clay, Clinton, Edwards and 35 more65 min
May 7, 4:10 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 10 more10 hr
May 7, 5:35 PM CDTMesoscale DiscussionSPCBureau, Carroll, Cass, Fulton, Hancock, Henderson and 11 more85 min
May 7, 6:10 PM CDTMesoscale DiscussionSPCBond, Cass, Christian, Greene, Jersey, Macoupin and 8 more2 hr
May 7, 6:40 PM CDTMesoscale DiscussionSPCFord, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more65 min
May 7, 6:58 PM CDTSevere Thunderstorm WatchSPCFord, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 5 more5 hr
May 6, 11:24 PM CDTMesoscale DiscussionSPCMarion, Ralls, Shelby96 min
May 7, 6:02 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more88 min
May 7, 6:45 PM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Holt, Nodaway6 hr

Nearby

Tornado Watches in Missouri, 2023Tornado Watches in Illinois, 2023Every tornado watch in 2023

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.