Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 66, NWS St. Louis, MO

June 19, 2021Calhoun County, Jersey County, Madison County, Illinois; Lincoln County, Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 19, 2021, 4:16 PM CDT for Calhoun County, Jersey County, Madison County, Illinois; Lincoln County, Saint Charles County, Saint Louis County, Missouri. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 19, 2021, 4:16 PM CDT (21:16 UTC)
Expired
Jun 19, 2021, 5:00 PM CDT
In force
44 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Madison County, IL, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 36 km from the middle of the area, began a volume at 21:19 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 19, 2:43 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.3 hours before the alert went out and 205 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, Lincoln, IL at 12:00Z on 2021-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2021-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1960 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

864 
WUUS53 KLSX 192116
SVRLSX
ILC013-083-119-MOC113-183-189-192200-
/O.NEW.KLSX.SV.W.0066.210619T2116Z-210619T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
416 PM CDT Sat Jun 19 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Calhoun County in southwestern Illinois...
  Northwestern Madison County in southwestern Illinois...
  Southwestern Jersey County in southwestern Illinois...
  Northeastern St. Charles County in east central Missouri...
  East central Lincoln County in east central Missouri...
  Northeastern St. Louis County in east central Missouri...

* Until 500 PM CDT.

* At 415 PM CDT, a severe thunderstorm was located near Orchard
  Farms, moving southeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Law enforcement reported wind damage with this storm in 
           Calhoun County. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Elsah and Portage Des Sioux around 425 PM CDT.

Other locations in the path of this severe thunderstorm include
Florissant, West Alton, Hazelwood, Berkeley, Ferguson, Calverton
Park, St. Louis, Alton, Godfrey, Jennings, Bellefontaine Neighbors,
Black Jack, Dellwood, Riverview, Spanish Lake and East Alton.

This also includes Confluence State Park and Pere Marquette State
Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3877 9017 3877 9018 3875 9019 3872 9024
      3906 9097 3917 9068 3914 9061 3912 9060
      3913 9060 3888 9000
TIME...MOT...LOC 2115Z 301DEG 15KT 3892 9044 

HAIL...1.00IN
WIND...60MPH
 
$$

KD
1 follow-up statement
859 
WWUS53 KLSX 192146
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
446 PM CDT Sat Jun 19 2021

ILC013-083-119-MOC113-183-189-192200-
/O.CON.KLSX.SV.W.0066.000000T0000Z-210619T2200Z/
Calhoun IL-Madison IL-Jersey IL-St. Charles MO-Lincoln MO-
St. Louis MO-
446 PM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN CALHOUN...WEST CENTRAL MADISON AND SOUTHWESTERN
JERSEY COUNTIES IN SOUTHWESTERN ILLINOIS...NORTHEASTERN ST.
CHARLES...EAST CENTRAL LINCOLN AND NORTHEASTERN ST. LOUIS COUNTIES IN
EAST CENTRAL MISSOURI...

At 446 PM CDT, a severe thunderstorm was located near West Alton,
moving southeast at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  West Alton, Ferguson, Calverton Park, Godfrey, Black Jack, 
  Dellwood, Bellefontaine Neighbors, Spanish Lake, Moline Acres, 
  Castle Point, Alton, Riverview, East Alton, St. Louis, Wood River 
  and Glasgow Village.

This also includes Pere Marquette State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3877 9017 3877 9018 3875 9019 3873 9022
      3894 9070 3896 9076 3908 9063 3888 9010
TIME...MOT...LOC 2146Z 301DEG 15KT 3885 9030 

HAIL...1.00IN
WIND...60MPH
 
$$

KD

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 5:44 AM CDTSevere Thunderstorm WarningLSXMarion18 min
Jun 19, 10:45 AM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery45 min
Jun 19, 2:15 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey31 min
Jun 19, 2:44 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey32 min
Jun 19, 2:52 PM CDTSevere Thunderstorm WarningLSXPike38 min
Jun 19, 2:55 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey50 min
Jun 19, 3:21 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Pike25 min
Jun 19, 3:31 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey44 min
Jun 19, 4:10 PM CDTFlash Flood WarningLSXCalhoun6 hr
Jun 19, 4:35 PM CDTFlash Flood WarningLSXCalhoun, Greene, Jersey6 hr
Jun 19, 4:43 PM CDTSevere Thunderstorm WarningLSXCalhoun47 min
Jun 19, 5:17 PM CDTSevere Thunderstorm WarningLSXSaint Clair43 min
Jun 19, 5:25 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair35 min
Jun 19, 6:00 PM CDTSevere Thunderstorm WarningLSXMonroe45 min
Jun 19, 5:09 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis51 min
Jun 19, 5:31 PM CDTSevere Thunderstorm WarningLSXMarion, Ralls59 min
Jun 19, 5:46 PM CDTSevere Thunderstorm WarningLSXPike, Ralls59 min
Jun 19, 5:58 PM CDTFlash Flood WarningLSXMarion, Pike, Ralls6 hr
Jun 19, 6:46 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike44 min
Jun 19, 6:54 PM CDTSevere Thunderstorm WarningLSXMonroe, Ralls51 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021Severe Thunderstorm Warnings in Missouri, 2021Every severe thunderstorm warning in 2021

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.