Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 68, NWS St. Louis, MO

June 19, 2021Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 19, 2021, 5:09 PM CDT for Saint Charles County, Saint Louis County, Missouri. It was in force for 51 min. 11 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 19, 2021, 5:09 PM CDT (22:09 UTC)
Expired
Jun 19, 2021, 6:00 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 6 km from the middle of the area, began a volume at 22:11 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 was reported inside it

TimeReportWhereRemark
Jun 19, 5:27 PM CDTTSTM WND GST 44Chesterfield, MO
Jun 19, 5:28 PM CDTTSTM WND GST 774 S Weldon Spring, MOAT SPIRIT OF ST. LOUIS AIRPORT.
Jun 19, 5:29 PM CDTTSTM WND DMG4 N Wildwood, MOTREE DOWNED. TIME ESTIMATED FROM RADAR.
Jun 19, 5:30 PM CDTTSTM WND DMG1 E Chesterfield, MOLARGE TREE AROUND A FOOT AND A HALF IN DIAMETER WAS BLOWN OVER NEAR CHESTERFIELD MALL.
Jun 19, 5:30 PM CDTTSTM WND DMG2 Ene Chesterfield, MOLARGE PINE TREE SNAPPED OF NEAR THE GROUND AT FAUST PARK. VIA TWITTER.
Jun 19, 5:32 PM CDTTSTM WND DMG2 Ese Chesterfield, MOLARGE TREE UPROOTED ONTO A HOUSE CAUSING MODERATE ROOF DAMAGE.
Jun 19, 5:34 PM CDTTSTM WND DMG4 N Wildwood, MOVIA TWITTER. MULTIPLE LARGE TREE LIMBS DOWN AT 109 AND WILD HORSE CREEK RD.
Jun 19, 5:38 PM CDTTSTM WND DMGEllisville, MOMULTIPLE TREES DOWNED. TIME ESTIMATED FROM RADAR.
Jun 19, 5:45 PM CDTTSTM WND DMGDardenne Prairie, MO0.8 INCH TREE LIMB DOWNED.
Jun 19, 5:55 PM CDTTSTM WND DMGBallwin, MOTHREE TO FOUR FOOT DIAMETER TREE UPROOTED IN TOWN.
Jun 19, 6:10 PM CDTTSTM WND DMG4 N Wildwood, MONUMEROUS TREE UPROOTED AND DOWNED. MAJORITY OF TREES ON A NEARBY HILL DOWNED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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, 10.2 hours before the alert went out and 240 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.

816 
WUUS53 KLSX 192209
SVRLSX
MOC183-189-192300-
/O.NEW.KLSX.SV.W.0068.210619T2209Z-210619T2300Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Central St. Charles County in east central Missouri...
  West central St. Louis County in east central Missouri...

* Until 600 PM CDT.

* At 509 PM CDT, a severe thunderstorm was located over Weldon
  Spring, moving south at 25 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.

* This severe thunderstorm will be near...
  Wildwood and Spirit of St. Louis Airport around 515 PM CDT.
  Chesterfield, Town and Country and Clarkson Valley around 520 PM 
  CDT.
  Ballwin and Ellisville around 525 PM CDT.

Other locations in the path of this severe thunderstorm include
Manchester, Winchester, Country Life Acres, Valley Park and Twin
Oaks.

This also includes Castlewood State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3878 9075 3859 9037 3852 9065
TIME...MOT...LOC 2209Z 341DEG 22KT 3871 9065 

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

KD
2 follow-up statements
923 
WWUS53 KLSX 192228
SVSLSX

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

MOC183-189-192300-
/O.CON.KLSX.SV.W.0068.000000T0000Z-210619T2300Z/
St. Charles MO-St. Louis MO-
528 PM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR CENTRAL ST. CHARLES AND WEST CENTRAL ST. LOUIS COUNTIES...

At 526 PM CDT, a severe thunderstorm was located over Clarkson
Valley, moving south at 25 mph.

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

SOURCE...The Spirit of St. Louis Airport reported a 60 mph wind 
         gust. 

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

Locations impacted include...
  Ballwin, Manchester, Ellisville, Winchester, Valley Park and Twin 
  Oaks.

This also includes Castlewood State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. This storm is producing widespread 
wind damage across the warned area. SEEK SHELTER NOW inside a sturdy 
structure and stay away from windows.

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3878 9075 3859 9037 3852 9065
TIME...MOT...LOC 2226Z 341DEG 22KT 3861 9060 

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

KD
295 
WWUS53 KLSX 192235
SVSLSX

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

MOC183-192244-
/O.CAN.KLSX.SV.W.0068.000000T0000Z-210619T2300Z/
St. Charles MO-
535 PM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ST. CHARLES COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. herefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
east central Missouri.

LAT...LON 3852 9065 3866 9070 3866 9068 3868 9068
      3869 9066 3869 9064 3868 9063 3868 9055
      3859 9037
TIME...MOT...LOC 2234Z 341DEG 22KT 3856 9058 

$$

MOC189-192300-
/O.CON.KLSX.SV.W.0068.000000T0000Z-210619T2300Z/
St. Louis MO-
535 PM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR WEST CENTRAL ST. LOUIS COUNTY...

At 534 PM CDT, a severe thunderstorms was located over Ellisville, 
moving south at 25 mph.

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

SOURCE...The Spirit of St. Louis Airport reported a 60 mph wind 
         gust. 

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

Locations impacted include...
Chesterfield, Wildwood, Ballwin, Kirkwood, Manchester, Town and
Country, Ellisville, Des Peres, Valley Park, Glendale, Weldon Spring,
Frontenac, Clarkson Valley, Warson Woods, Spirit of St. Louis
Airport, Winchester, Crystal Lake Park, Twin Oaks, Huntleigh and
Country Life Acres.

This also includes Castlewood State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing widespread wind damage across St. Charles 
County. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows.

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3852 9065 3866 9070 3866 9068 3868 9068
      3869 9066 3869 9064 3868 9063 3868 9055
      3859 9037
TIME...MOT...LOC 2234Z 341DEG 22KT 3856 9058 

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, 2:15 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike31 min
Jun 19, 2:44 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike32 min
Jun 19, 2:52 PM CDTSevere Thunderstorm WarningLSXPike38 min
Jun 19, 2:55 PM CDTSevere Thunderstorm WarningLSXLincoln50 min
Jun 19, 3:21 PM CDTSevere Thunderstorm WarningLSXPike25 min
Jun 19, 3:31 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles44 min
Jun 19, 4:16 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Saint Louis44 min
Jun 19, 4:35 PM CDTFlash Flood WarningLSXSaint Charles6 hr
Jun 19, 4:43 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis47 min
Jun 19, 5:17 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis43 min
Jun 19, 5:25 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis35 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, 6:00 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis45 min
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 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.