Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 119, NWS St. Louis, MO

July 9, 2021Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 9:14 PM CDT for Saint Louis County, City of Saint Louis, Missouri. It was in force for 48 min. 7 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: Jul 9, 2021, 9:14 PM CDT (02:14 UTC)
Expired: Jul 9, 2021, 10:02 PM CDT
In force: 48 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 34 km from the middle of the area, began a volume at 02:17 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

Time	Report	Where	Remark
Jul 9, 9:32 PM CDT	HAIL 1.5	1 Nnw Creve Coeur, MO	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
Jul 9, 9:34 PM CDT	HAIL 0.7	Brentwood, MO	PUBLIC REPORT FROM MADGE AVENUE.
Jul 9, 9:40 PM CDT	HAIL 0.25	Warson Woods, MO
Jul 9, 9:41 PM CDT	HAIL 0.25	Brentwood, MO	PEA SIZE HAIL MIXING WITH VERY HEAVY RAIN.
Jul 9, 9:42 PM CDT	HAIL 0.7	Brentwood, MO
Jul 9, 9:45 PM CDT	HAIL 1.75	Creve Coeur, MO	AT MOSLEY AND LADUE.
Jul 9, 9:47 PM CDT	HAIL 1	1 Nw Brentwood, MO

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.

Issued	Product	Office	Lasted
Jul 9, 8:18 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.2 hours before the alert went out and 224 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1282 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

815 
WUUS53 KLSX 100214
SVRLSX
MOC189-510-100315-
/O.NEW.KLSX.SV.W.0119.210710T0214Z-210710T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
914 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

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

* Until 1015 PM CDT.

* At 914 PM CDT, a severe thunderstorm was located over Bridgeton,
  moving south at 15 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles.

* This severe thunderstorm will be near...
  Maryland Heights around 920 PM CDT.

Other locations in the path of this severe thunderstorm include
Chesterfield, Creve Coeur, University City, Town and Country,
Pagedale, Wellston, Clayton, Ladue, Frontenac, Westwood, Ballwin,
Richmond Heights, Country Life Acres, Manchester, Des Peres,
Brentwood, Maplewood, Rock Hill, Crystal Lake Park, Huntleigh,
Kirkwood, Webster Groves, Shrewsbury, Glendale, Warson Woods,
Winchester, Valley Park, Oakland, Twin Oaks and Mackenzie.

This includes Interstate 44 in Missouri between exits 272 and 277.
 
This also includes Scott Joplin Historic Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3859 9019 3857 9023 3853 9026 3851 9031
      3850 9053 3874 9053 3876 9049 3862 9040
      3874 9021 3871 9021 3868 9019 3863 9018
TIME...MOT...LOC 0214Z 354DEG 13KT 3877 9045 

HAIL...1.50IN
WIND...<50MPH
 
$$

CVKING

4 follow-up statements

295 
WWUS53 KLSX 100223 RRA
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
923 PM CDT Fri Jul 9 2021

MOC189-510-100315-
/O.CON.KLSX.SV.W.0119.000000T0000Z-210710T0315Z/
St. Louis City MO-St. Louis MO-
923 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR CENTRAL ST. LOUIS COUNTY AND ST. LOUIS CITY...

At 923 PM CDT, a severe thunderstorm was located over Champ, moving
south at 15 mph.

HAZARD...Golf ball size hail.

SOURCE...Trained weather spotters reported golf ball sized hail.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Normandy around 930 PM CDT.

Other locations in the path of this severe thunderstorm include
Chesterfield, University City, Creve Coeur, Town and Country,
Hillsdale, Pagedale, Wellston, Ladue, Clayton, Richmond Heights,
Frontenac, Westwood, Manchester, Des Peres, Brentwood, Maplewood,
Crystal Lake Park, Huntleigh, Country Life Acres, Kirkwood, Webster
Groves, Glendale, Warson Woods, Rock Hill, Winchester, Shrewsbury,
Oakland, Crestwood, Valley Park, Affton, Marlborough, Twin Oaks and
Mackenzie.

This includes Interstate 44 in Missouri between exits 272 and 277.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and east central Missouri.

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

&&

LAT...LON 3857 9023 3853 9026 3851 9031 3850 9053
      3874 9053 3876 9049 3862 9040 3872 9025
      3867 9023
TIME...MOT...LOC 0223Z 354DEG 13KT 3874 9045 

HAIL...1.75IN
WIND...<50MPH
 
$$

CVKING

164 
WWUS53 KLSX 100232
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
932 PM CDT Fri Jul 9 2021

MOC189-510-100315-
/O.CON.KLSX.SV.W.0119.000000T0000Z-210710T0315Z/
St. Louis City MO-St. Louis MO-
932 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR CENTRAL ST. LOUIS COUNTY AND SOUTHWESTERN ST. LOUIS CITY...

At 932 PM CDT, a severe thunderstorm was located over Creve Coeur,
moving south at 20 mph.

HAZARD...Two inch hail.

SOURCE...Trained weather spotters near Maryland Heights.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Chesterfield, University City, Creve Coeur, Town and Country, 
  Pagedale and Wellston around 935 PM CDT.
  Clayton, Ladue, Frontenac and Westwood around 940 PM CDT.

Other locations in the path of this severe thunderstorm include
Richmond Heights, Des Peres, Brentwood, Crystal Lake Park, Huntleigh,
Country Life Acres, Kirkwood, Webster Groves, Manchester, Maplewood,
Glendale, Warson Woods, Rock Hill, Winchester, Valley Park,
Shrewsbury, Oakland, Twin Oaks, Mackenzie, Crestwood, Sunset Hills,
Affton, Marlborough, Grantwood Village, Fenton, Lakeshire, Lemay,
Green Park, St. George, Bella Villa, Wilbur Park, Sappington, Concord
and Mehlville.

This includes Interstate 44 in Missouri between exits 272 and 277.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for east central
Missouri.

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

&&

LAT...LON 3853 9026 3851 9031 3850 9053 3870 9053
      3873 9047 3862 9040 3869 9027
TIME...MOT...LOC 0232Z 352DEG 17KT 3869 9044 

HAIL...2.00IN
WIND...<50MPH
 
$$

CVKING

598 
WWUS53 KLSX 100255
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
955 PM CDT Fri Jul 9 2021

MOC189-510-100315-
/O.CON.KLSX.SV.W.0119.000000T0000Z-210710T0315Z/
St. Louis City MO-St. Louis MO-
955 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTH CENTRAL ST. LOUIS COUNTY AND SOUTHWESTERN ST. LOUIS CITY...

At 955 PM CDT, a severe thunderstorm was located over Huntleigh,
moving south at 15 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
  Kirkwood, Webster Groves, Valley Park, Shrewsbury, Oakland, 
  Crestwood, Sunset Hills, Marlborough, Mackenzie, Fenton, Affton, 
  Grantwood Village, Lakeshire, Lemay, Green Park, Bella Villa, 
  Wilbur Park, Sappington, Concord, Mehlville and St. George.

This includes Interstate 44 in Missouri between exits 272 and 277.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for east central
Missouri.

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

&&

LAT...LON 3853 9026 3851 9031 3850 9053 3860 9051
      3866 9043 3866 9042 3862 9040 3864 9037
      3864 9036 3861 9027
TIME...MOT...LOC 0255Z 347DEG 13KT 3860 9042 

HAIL...1.00IN
WIND...<50MPH
 
$$

CVKING

876 
WWUS53 KLSX 100302
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1002 PM CDT Fri Jul 9 2021

MOC189-510-100312-
/O.CAN.KLSX.SV.W.0119.000000T0000Z-210710T0315Z/
St. Louis City MO-St. Louis MO-
1002 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ST. LOUIS COUNTY
AND SOUTHWESTERN ST. LOUIS CITY IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail and
heavy rain are still possible with this thunderstorm.

A Tornado Watch remains in effect until 200 AM CDT for east central
Missouri.

LAT...LON 3853 9026 3851 9031 3850 9053 3860 9051
      3866 9043 3866 9042 3862 9040 3864 9037
      3864 9036 3861 9027
TIME...MOT...LOC 0301Z 354DEG 13KT 3857 9042 

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:21 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	39 min
Jul 9, 8:55 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	50 min
Jul 9, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	62 min
Jul 9, 9:00 PM CDT	Severe Thunderstorm Warning	LSX	Knox	45 min
Jul 9, 9:08 PM CDT	Areal Flood Advisory	LSX	Lewis, Marion	32 min
Jul 9, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Shelby	65 min
Jul 9, 9:36 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Pike, Ralls, Shelby	54 min
Jul 9, 9:40 PM CDT	Flash Flood Warning	LSX	Lewis, Marion	3 hr
Jul 9, 10:10 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Lincoln, Monroe, Pike, Ralls	50 min
Jul 9, 10:32 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Shelby	23 min
Jul 9, 10:45 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Lincoln, Montgomery, Pike, Warren	45 min
Jul 9, 11:08 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Montgomery, Osage, Warren	67 min
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Lewis	5 days
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Lewis	32 hr
Jul 9, 11:10 PM CDT	River Flood Warning	LSX	Marion	4 days
Jul 9, 11:24 PM CDT	Areal Flood Advisory	LSX	Audrain, Marion, Monroe, Pike, Ralls, Shelby	3 hr
Jul 9, 11:28 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Saint Charles, Warren	47 min
Jul 9, 11:57 PM CDT	Areal Flood Advisory	LSX	Lincoln, Pike	3 hr
Jul 9, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more	61 min
Jul 10, 12:26 AM CDT	Areal Flood Advisory	LSX	Lincoln, Saint Charles	3 hr
Jul 10, 12:41 AM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr
Jul 10, 12:42 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	63 min
Jul 10, 1:08 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	52 min
Jul 10, 1:49 AM CDT	River Flood Warning	LSX	Marion	18 hr
Jul 10, 1:50 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois, Washington	40 min
Jul 10, 2:29 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	21 min
Jul 10, 6:14 AM CDT	River Flood Warning	LSX	Monroe	4 days
Jul 10, 8:30 AM CDT	River Flood Warning	LSX	Lincoln	3 days
Jul 10, 2:15 PM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis	3 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Every 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.