Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 126, NWS St. Louis, MO

July 9, 20214 counties in Missouri; Calhoun County, Jersey County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 11:28 PM CDT for 4 counties in Missouri; Calhoun County, Jersey County, Illinois. It was in force for 47 min. 16 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, 11:28 PM CDT (04:28 UTC)
Expired: Jul 10, 2021, 12:15 AM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Lincoln County, MO, Montgomery County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 29 km from the middle of the area, began a volume at 04:27 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, 11:33 PM CDT	TSTM WND DMG	Michael, IL	CALHOUN COUNTY SHERIFF RECEIVED REPORTS OF TREES DOWN NEAR MICHAEL. TIME ESTIMATED BY RADAR.
Jul 9, 11:40 PM CDT	TSTM WND DMG	Hawk Point, MO	TREES DOWN WITH WINDS ESTIMATED TO BE NEAR 60 MPH.
Jul 9, 11:42 PM CDT	TSTM WND DMG	3 Nne Warrenton, MO	DELAYED REPORT: SPOTTER CALLED TO REPORT DAMAGE TO SEVERAL MANUFACTURED HOMES NEAR OFF CRANBERRY COURT. UNDERPINNING HAS BEEN BLOWN OFF WITH A COUPLE OF HOMES SUFFERING DAMAGE TO TIE DOWNS/SUPPORTS. TIME ESTIMATED BY RADAR.
Jul 9, 11:43 PM CDT	HAIL 1	3 Wnw Saint Paul, MO	REPORT FROM MPING: QUARTER (1.00 IN.).
Jul 9, 11:45 PM CDT	TSTM WND DMG	4 Ssw Troy, MO	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 4 SSW TROY. TREE HAS FALLEN INTO A HOUSE ALONG HWY J.
Jul 9, 11:46 PM CDT	TSTM WND DMG	Troy, MO	TREES AND POWERLINES DOWN.
Jul 10, 12:00 AM CDT	TSTM WND DMG	4 Wsw New Melle, MO	SEVERAL UTILITY POLES HAVE BEEN SNAPPED IN HALF NEAR HIGHWAYS T AND D.
Jul 10, 12:03 AM CDT	TSTM WND GST 71	3 Sw Wentzville, MO	MEASURED GUST FROM A STORM SPOTTER.
Jul 10, 12:08 AM CDT	TSTM WND DMG	4 Wsw New Melle, MO	SEVERAL UTILITY POLES SNAPPED NEAR HIGHWAY T AND HIGHWAY D.
Jul 10, 12:15 AM CDT	TSTM WND DMG	1 Ese Lake Saint Louis, MO	TREE DOWN NEAR LAKE ST. LOUIS BLVD AND LOCKSLEY MANOR DRIVE.
Jul 10, 12:16 AM CDT	TSTM WND GST 60	2 Nne O'Fallon, MO	SPOTTER MEASURED 60 MPH WITH INSTRUMENTATION INSTALLED TO PRIVATE RESIDENCE.
Jul 10, 12:20 AM CDT	TSTM WND GST 64	3 Nne Orchard Farms, MO	ST CHARLES COUNTY SMARTT FIELD.
Jul 10, 12:20 AM CDT	TSTM WND GST 64	3 Nne Orchard Farms, MO	ST. CHARLES COUNTY SMARTT FIELD.
Jul 10, 12:20 AM CDT	TSTM WND GST 64	3 Nne Orchard Farms, MO	ST CHARLES SMARTT FIELD.
Jul 10, 12:20 AM CDT	TSTM WND GST 64	3 Nne Orchard Farms, MO	ST. CHARLES SMARTT FIELD.
Jul 10, 12:24 AM CDT	TSTM WND DMG	2 Nne O'Fallon, MO	TREE AND POWERLINES DOWN IN THE ROAD NEAR ELM STREET AND SONDEREN STREET.

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, 4.5 hours before the alert went out and 227 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.

117 
WUUS53 KLSX 100428
SVRLSX
ILC013-083-MOC113-139-183-219-100515-
/O.NEW.KLSX.SV.W.0126.210710T0428Z-210710T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1128 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Calhoun County in southwestern Illinois...
  Southwestern Jersey County in southwestern Illinois...
  St. Charles County in east central Missouri...
  Lincoln County in east central Missouri...
  East central Montgomery County in east central Missouri...
  Northeastern Warren County in east central Missouri...

* Until 1215 AM CDT.

* At 1128 PM CDT, severe thunderstorms were located along a line
  extending from Hardin to near Elsberry to near Davis, moving south
  at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Winfield around 1145 PM CDT.

Other locations in the path of these severe thunderstorms include
Troy, Moscow Mills, Fountain N' Lakes, Chain of Rocks, Grafton, St.
Paul, Elsah, Wright City, Josephville, O'Fallon, St. Charles, St.
Peters, Florissant, Wentzville, Maryland Heights, Hazelwood, Lake St.
Louis, Bridgeton and Dardenne Prairie.

This includes Interstate 70 in Missouri between exits 175 and 183,
and between exits 203 and 229.
 
This also includes Cuivre River State Park, First Missouri State
Capitol Historic Site, and Pere Marquette State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in St Louis.

&&

LAT...LON 3912 9060 3918 9058 3919 9055 3914 9042
      3887 9034 3882 9038 3882 9045 3869 9054
      3868 9067 3860 9077 3853 9092 3855 9097
      3884 9097 3884 9146 3896 9146 3916 9116
      3923 9091 3922 9072 3926 9073 3927 9061
TIME...MOT...LOC 0428Z 340DEG 23KT 3915 9059 3910 9080 3910 9101 

HAIL...<.75IN
WIND...60MPH
 
$$

Gosselin

2 follow-up statements

500 
WWUS53 KLSX 100442
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1142 PM CDT Fri Jul 9 2021

ILC013-083-MOC113-139-183-219-100515-
/O.CON.KLSX.SV.W.0126.000000T0000Z-210710T0515Z/
Calhoun IL-Jersey IL-St. Charles MO-Lincoln MO-Montgomery MO-
Warren MO-
1142 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTHEASTERN CALHOUN...SOUTHWESTERN JERSEY...ST. CHARLES...
LINCOLN...EAST CENTRAL MONTGOMERY AND NORTHEASTERN WARREN COUNTIES...

At 1141 PM CDT, severe thunderstorms were located along a line
extending from 7 miles southeast of Hardin to near Winfield to near
Troy, moving south at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Emergency management reported trees down in Hawk Point.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Winfield around 1145 PM CDT.

Other locations in the path of these severe thunderstorms include
Moscow Mills, Fountain N' Lakes, Chain of Rocks, Grafton, St. Paul,
Elsah, Wright City, St. Charles, Orchard Farms, O'Fallon, Wentzville,
Lake St. Louis, Dardenne Prairie and Josephville.

This also includes Cuivre River State Park, First Missouri State
Capitol Historic Site, and Pere Marquette State Park.
 
This includes Interstate 70 in Missouri between exits 179 and 183,
and between exits 203 and 229.
 
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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 3912 9060 3918 9058 3919 9055 3914 9042
      3887 9034 3882 9038 3882 9045 3869 9054
      3868 9067 3860 9077 3853 9092 3855 9097
      3884 9097 3884 9144 3895 9140 3913 9114
      3917 9091 3917 9074 3916 9067 3915 9061
TIME...MOT...LOC 0441Z 340DEG 23KT 3907 9055 3902 9076 3902 9097 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Gosselin

689 
WWUS53 KLSX 100452
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1152 PM CDT Fri Jul 9 2021

MOC139-100501-
/O.CAN.KLSX.SV.W.0126.000000T0000Z-210710T0515Z/
Montgomery MO-
1152 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 3910 9068 3911 9062 3913 9058 3914 9053
      3914 9042 3887 9034 3882 9038 3882 9045
      3869 9054 3868 9067 3860 9077 3853 9092
      3855 9097 3884 9097 3884 9126 3894 9123
      3903 9106 3907 9089
TIME...MOT...LOC 0451Z 339DEG 23KT 3901 9051 3896 9073 3896 9094 

$$

ILC013-083-MOC113-183-219-100515-
/O.CON.KLSX.SV.W.0126.000000T0000Z-210710T0515Z/
Calhoun IL-Jersey IL-St. Charles MO-Lincoln MO-Warren MO-
1152 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTHEASTERN CALHOUN...SOUTHWESTERN JERSEY...ST. CHARLES...
SOUTHERN LINCOLN AND EASTERN WARREN COUNTIES...

At 1151 PM CDT, severe thunderstorms were located along a line
extending from near Grafton to near Winfield to Moscow Mills, moving
south at 25 mph.

HAZARD...70 mph wind gusts.

SOURCE...Emergency management.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Chain of Rocks around 1155 PM CDT.
  Grafton around 1200 AM CDT.

Other locations in the path of these severe thunderstorms include St.
Paul, Elsah, Wright City, St. Charles, Orchard Farms, O'Fallon,
Wentzville, Lake St. Louis, Dardenne Prairie, Josephville,
Florissant, Cottleville, St. Peters, Maryland Heights, Hazelwood,
Bridgeton, Weldon Spring, New Melle, Weldon Spring Heights and
Harvester.

This also includes Cuivre River State Park, First Missouri State
Capitol Historic Site, and Pere Marquette State Park.
 
This includes Interstate 70 in Missouri between exits 203 and 229.
 
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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
St Louis.

&&

LAT...LON 3910 9068 3911 9062 3913 9058 3914 9053
      3914 9042 3887 9034 3882 9038 3882 9045
      3869 9054 3868 9067 3860 9077 3853 9092
      3855 9097 3884 9097 3884 9126 3894 9123
      3903 9106 3907 9089
TIME...MOT...LOC 0451Z 339DEG 23KT 3901 9051 3896 9073 3896 9094 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Gosselin

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, 9:14 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 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, 11:57 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
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	38 min
Jul 9, 8:43 PM CDT	Severe Thunderstorm Warning	LSX	Brown	47 min
Jul 9, 9:17 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	43 min
Jul 9, 10:03 PM CDT	Areal Flood Advisory	LSX	Adams, Brown, Pike	3 hr
Jul 10, 1:36 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Marion, Saint Clair, Washington	54 min
Jul 10, 2:49 AM CDT	River Flood Warning	LSX	Calhoun, Greene, Jersey	10 days
Jul 10, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	21 min
Jul 10, 3:11 PM CDT	Areal Flood Advisory	LSX	Macoupin, Madison	3 hr
Jul 10, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Randolph, Washington	59 min

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.