Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 129, NWS St. Louis, MO

July 10, 2021Monroe County, Randolph County, Illinois; 4 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 10, 2021, 1:08 AM CDT for Monroe County, Randolph County, Illinois; 4 counties in Missouri. It was in force for 52 min. 2 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 10, 2021, 1:08 AM CDT (06:08 UTC)
Expired: Jul 10, 2021, 2:00 AM CDT
In force: 52 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Monroe County, IL, Randolph County, IL, Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 06:10 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 10, 1:30 AM CDT	TSTM WND GST 60	1 Ne Old Mines, MO	LARGE TREE BRANCHES BLOWN DOWN.
Jul 10, 2:06 AM CDT	HAIL 1.75	Ellis Grove, IL

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, 6.1 hours before the alert went out and 293 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.

857 
WUUS53 KLSX 100608
SVRLSX
ILC133-157-MOC099-186-187-221-100700-
/O.NEW.KLSX.SV.W.0129.210710T0608Z-210710T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
108 AM CDT Sat Jul 10 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southwestern Monroe County in southwestern Illinois...
  Western Randolph County in southwestern Illinois...
  Southern Jefferson County in east central Missouri...
  Ste. Genevieve County in southeastern Missouri...
  Washington County in east central Missouri...
  St. Francois County in southeastern Missouri...

* Until 200 AM CDT.

* At 108 AM CDT, severe thunderstorms were located along a line
  extending from near Cedar Hill Lakes to 7 miles west of De Soto to
  6 miles southwest of Richwoods, moving east at 50 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  De Soto and Hillsboro around 115 AM CDT.
  Pevely, Olympian Village and Horine around 120 AM CDT.
  Festus, Crystal City, Herculaneum and Mineral Point around 125 AM 
  CDT.

Other locations in the path of these severe thunderstorms include
Bonne Terre, Bloomsdale, Ste. Genevieve, Red Bud, Evansville, Rocky
Ridge, Weingarten, Baldwin and St. Mary.

This includes Interstate 55 in Missouri between exits 141 and 178.
 
This also includes Washington State Park, St. Joe State Park, St.
Francois State Park, Hawn State Park, Felix Valle House State Park,
Sandy Creek Covered Bridge Historic Site, and Missouri Mines Historic
Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and southeastern 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 3774 9065 3775 9110 3811 9109 3814 9078
      3831 9067 3822 9004 3822 8978 3794 8987
      3783 8999 3765 9014 3764 9065
TIME...MOT...LOC 0608Z 285DEG 44KT 3830 9063 3812 9069 3810 9091 

HAIL...1.25IN
WIND...60MPH
 
$$

Gosselin

2 follow-up statements

370 
WWUS53 KLSX 100626
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
126 AM CDT Sat Jul 10 2021

ILC133-157-MOC099-186-187-221-100700-
/O.CON.KLSX.SV.W.0129.000000T0000Z-210710T0700Z/
Monroe IL-Randolph IL-Jefferson MO-Ste. Genevieve MO-Washington MO-
St. Francois MO-
126 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR SOUTHWESTERN MONROE...WESTERN RANDOLPH...SOUTHERN JEFFERSON...
STE. GENEVIEVE...WASHINGTON AND ST. FRANCOIS COUNTIES...

At 126 AM CDT, severe thunderstorms were located along a line
extending from Crystal City to near Olympian Village to 6 miles east
of Old Mines, moving east at 50 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...
  Crystal City, Bonne Terre, Bloomsdale, Ste. Genevieve, Red Bud, 
  Rocky Ridge, Weingarten, Evansville, Baldwin and St. Mary.

This also includes Washington State Park, St. Joe State Park, St.
Francois State Park, Hawn State Park, Felix Valle House State Park,
Sandy Creek Covered Bridge Historic Site, and Missouri Mines Historic
Site.
 
This includes Interstate 55 in Missouri between exits 141 and 178.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and southeastern 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 3774 9065 3775 9110 3806 9109 3812 9077
      3830 9058 3822 9004 3822 8978 3794 8987
      3783 8999 3765 9014 3764 9065
TIME...MOT...LOC 0626Z 285DEG 44KT 3824 9036 3806 9043 3804 9065 

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

Gosselin

456 
WWUS53 KLSX 100637
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
137 AM CDT Sat Jul 10 2021

ILC133-157-MOC099-186-187-221-100700-
/O.CON.KLSX.SV.W.0129.000000T0000Z-210710T0700Z/
Monroe IL-Randolph IL-Jefferson MO-Ste. Genevieve MO-Washington MO-
St. Francois MO-
137 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR SOUTHWESTERN MONROE...WESTERN RANDOLPH...SOUTHEASTERN
JEFFERSON...STE. GENEVIEVE...WASHINGTON AND ST. FRANCOIS COUNTIES...

At 136 AM CDT, severe thunderstorms were located along a line
extending from 6 miles southwest of New Design to near Bloomsdale to
6 miles north of Bonne Terre, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters reported estimated 60 mph wind 
         gusts earlier in Old Mines.

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

Locations impacted include...
Farmington, Bonne Terre, Desloge, Ste. Genevieve, Red Bud, Potosi,
Bismarck, Leadwood, Park Hills, Olympian Village, Iron Mountain Lake,
Evansville, Bloomsdale, Irondale, Baldwin, St. Mary, Mineral Point,
Old Mines, Weingarten and Womac.

This also includes St. Joe State Park, St. Francois State Park, Hawn
State Park, Felix Valle House State Park, and Missouri Mines Historic
Site.
 
This includes Interstate 55 in Missouri between exits 141 and 170.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for southwestern
Illinois...and southeastern 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 3774 9065 3775 9110 3803 9109 3805 9077
      3811 9051 3824 9023 3822 9004 3822 8978
      3794 8987 3783 8999 3765 9014 3764 9065
TIME...MOT...LOC 0636Z 285DEG 44KT 3821 9022 3803 9029 3801 9051 

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

Gosselin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:07 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, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams	65 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 9, 11:24 PM CDT	Areal Flood Advisory	LSX	Pike	3 hr
Jul 9, 11:28 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	47 min
Jul 9, 11:57 PM CDT	Areal Flood Advisory	LSX	Calhoun, Greene, Pike	3 hr
Jul 9, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	61 min
Jul 10, 12:26 AM CDT	Areal Flood Advisory	LSX	Calhoun, Jersey	3 hr
Jul 10, 12:42 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair, Washington	63 min
Jul 10, 1:36 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Marion, Saint Clair, Washington	54 min
Jul 10, 1:50 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	40 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
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, 9:14 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 10, 12:41 AM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr
Jul 10, 1:49 AM CDT	River Flood Warning	LSX	Marion	18 hr
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 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.