Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS St. Louis, MO

June 19, 2021Saint Louis County, City of Saint Louis, Missouri; Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 19, 2021, 5:17 PM CDT for Saint Louis County, City of Saint Louis, Missouri; Saint Clair County, Illinois. It was in force for 43 min. 1 report 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, 5:17 PM CDT (22:17 UTC)
Expired: Jun 19, 2021, 6:00 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The St Louis radar (KLSX), 37 km from the middle of the area, began a volume at 22:19 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.

What was reported inside it

Time	Report	Where	Remark
Jun 19, 5:30 PM CDT	HAIL 0.25	Creve Coeur, 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
Jun 19, 2:43 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 217 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: 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.

939 
WUUS53 KLSX 192217
SVRLSX
ILC163-MOC189-510-192300-
/O.NEW.KLSX.SV.W.0069.210619T2217Z-210619T2300Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern St. Clair County in southwestern Illinois...
  St. Louis City in east central Missouri...
  Central St. Louis County in east central Missouri...

* Until 600 PM CDT.

* At 516 PM CDT, a severe thunderstorm was located over St. Ann,
  moving southeast 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...
  Ferguson, Overland, Berkeley, Olivette, St. John, Woodson Terrace, 
  Kinloch, Breckenridge Hills and Calverton Park around 520 PM CDT.
  Ladue, Des Peres, Dellwood, Normandy, Frontenac, Bel-Ridge, Cool 
  Valley, Hanley Hills, Vinita Park and Charlack around 525 PM CDT.
  University City, Kirkwood, Clayton, Jennings, Northwoods, Warson 
  Woods, Pagedale, Bel-Nor, Velda City and Country Club Hills around 
  530 PM CDT.
  Webster Groves, Richmond Heights, Brentwood, Glendale, Hillsdale, 
  Rock Hill, Pine Lawn, Wellston, Velda Village Hills and Uplands 
  Park around 535 PM CDT.

Other locations in the path of this severe thunderstorm include
Maplewood, Shrewsbury, Affton, Marlborough, Mackenzie, Brooklyn,
Wilbur Park, Lemay and Bella Villa.

This includes the following highways...
 Interstate 64 in Illinois between exits 9 and 12.
 Interstate 70 in Missouri near exit 231.

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 3860 8996 3849 9020 3868 9055 3870 9053
      3873 9053 3883 9041 3873 9021 3871 9021
      3866 9018 3866 9008
TIME...MOT...LOC 2216Z 313DEG 17KT 3871 9040 

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

KD

1 follow-up statement

929 
WWUS53 KLSX 192241
SVSLSX

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

ILC163-MOC189-510-192300-
/O.CON.KLSX.SV.W.0069.000000T0000Z-210619T2300Z/
St. Clair IL-St. Louis City MO-St. Louis MO-
541 PM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHWESTERN ST. CLAIR AND CENTRAL ST. LOUIS COUNTIES AND ST.
LOUIS CITY...

At 541 PM CDT, a severe thunderstorm was located over Maplewood,
moving east at 30 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...
  Lemay, Bella Villa, Brooklyn, East Carondelet, Cahokia, 
  Centreville, Dupo, Cahokia Parks Airport, Fairmont City, Alorton, 
  Washington Park, East St. Louis, Fairview Heights and Belleville.

This also includes Scott Joplin Historic Site.
 
This includes the following highways...
 Interstate 64 in Illinois between exits 9 and 12.
 Interstate 70 in Missouri near exit 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3860 8996 3849 9020 3868 9055 3870 9053
      3873 9053 3877 9042 3873 9021 3871 9021
      3866 9018 3866 9008
TIME...MOT...LOC 2241Z 290DEG 25KT 3862 9032 

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

KD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 2:15 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	31 min
Jun 19, 2:44 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	32 min
Jun 19, 2:52 PM CDT	Severe Thunderstorm Warning	LSX	Pike	38 min
Jun 19, 2:55 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	50 min
Jun 19, 3:21 PM CDT	Severe Thunderstorm Warning	LSX	Pike	25 min
Jun 19, 3:31 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles	44 min
Jun 19, 4:16 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Saint Louis	44 min
Jun 19, 4:35 PM CDT	Flash Flood Warning	LSX	Saint Charles	6 hr
Jun 19, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	47 min
Jun 19, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	51 min
Jun 19, 5:25 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	35 min
Jun 19, 5:31 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	59 min
Jun 19, 5:46 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	59 min
Jun 19, 5:58 PM CDT	Flash Flood Warning	LSX	Marion, Pike, Ralls	6 hr
Jun 19, 6:00 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	45 min
Jun 19, 6:46 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	44 min
Jun 19, 6:54 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Ralls	51 min
Jun 19, 5:44 AM CDT	Severe Thunderstorm Warning	LSX	Marion	18 min
Jun 19, 10:45 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	45 min
Jun 19, 4:10 PM CDT	Flash Flood Warning	LSX	Calhoun	6 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Severe Thunderstorm Warnings in Illinois, 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.