Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 125, NWS St. Louis, MO

July 9, 20216 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 11:08 PM CDT for 6 counties in Missouri. It was in force for 67 min. 5 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, 11:08 PM CDT (04:08 UTC)
Expired: Jul 10, 2021, 12:15 AM CDT
In force: 67 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Callaway County, MO, Franklin County, MO, Gasconade County, MO, Montgomery County, MO, Osage County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 04:11 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

Time	Report	Where	Remark
Jul 9, 11:17 PM CDT	TSTM WND DMG	4 Wnw Reform, MO	TREE LIMBS BLOCKING HWY O NEAR RT 111. TIME ESTIMATED BY RADAR.
Jul 9, 11:42 PM CDT	TSTM WND DMG	Warrenton, MO	DELAYED REPORT: LARGE SIGN DAMAGED NEAR THE SHOPPING CENTER OFF WARREN COUNTY CTR. SEVERAL TREES DOWN IN THE AREA, ONE OF WHICH IS 3 FEET IN DIAMETER AND UPROOTED. TIME ESTIMATED BY RADAR.
Jul 9, 11:45 PM CDT	TSTM WND GST 60	Warrenton, MO	STORM SPOTTER REPORTS 60 MPH WINDS AND POWER FLASHES.
Jul 9, 11:52 PM CDT	TSTM WND DMG	2 Ssw Wright City, MO	TREE TOPPED. SMALL SHED MOVED SEVERAL FEET.
Jul 10, 12:00 AM CDT	TSTM WND DMG	Mokane, MO	LARGE MAPLE TREE BLOWN OVER BY WIND ONTO A HOME.

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

Springfield, MO (KSGF), launched 00:00Z, 4.1 hours before the alert went out and 275 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: 2520 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1344 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

994 
WUUS53 KLSX 100408
SVRLSX
MOC027-071-073-139-151-219-100515-
/O.NEW.KLSX.SV.W.0125.210710T0408Z-210710T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1108 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southwestern Montgomery County in east central Missouri...
  Southeastern Callaway County in central Missouri...
  Franklin County in east central Missouri...
  Osage County in central Missouri...
  Warren County in east central Missouri...
  Gasconade County in east central Missouri...

* Until 1215 AM CDT.

* At 1108 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles north of Buell to Montgomery City to near
  Mineola to 6 miles northeast of Fulton, moving south at 40 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Big Spring around 1125 PM CDT.

Other locations in the path of these severe thunderstorms include
Chamois, Hermann, Swiss, Linn, Drake, Mount Sterling, Owensville,
Treloar, New Haven, Gerald and Rosebud.

This includes the following highways...
 Interstate 44 in Missouri between exits 225 and 242.
 Interstate 70 in Missouri between exits 188 and 200.

This also includes Deutschheim Historic Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3884 9096 3855 9097 3821 9094 3821 9161
      3822 9165 3829 9165 3829 9188 3885 9197
TIME...MOT...LOC 0408Z 348DEG 36KT 3914 9141 3896 9149 3888 9162 3891
9185

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

CVKING

2 follow-up statements

954 
WWUS53 KLSX 100434
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1134 PM CDT Fri Jul 9 2021

MOC027-151-100443-
/O.CAN.KLSX.SV.W.0125.000000T0000Z-210710T0515Z/
Callaway MO-Osage MO-
1134 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CALLAWAY AND
OSAGE COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

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

LAT...LON 3855 9097 3854 9122 3857 9138 3865 9147
      3876 9146 3884 9145 3884 9096 3856 9097
TIME...MOT...LOC 0433Z 306DEG 35KT 3882 9124 3871 9142 

$$

MOC071-073-139-219-100515-
/O.CON.KLSX.SV.W.0125.000000T0000Z-210710T0515Z/
Montgomery MO-Franklin MO-Warren MO-Gasconade MO-
1134 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTH CENTRAL MONTGOMERY...NORTHWESTERN FRANKLIN...WARREN AND
NORTHEASTERN GASCONADE COUNTIES...

At 1133 PM CDT, severe thunderstorms were located along a line
extending from near Jonesburg to Hermann, moving southeast at 40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Warrenton, Truesdale, Innsbrook, Treloar, New Haven, Marthasville, 
  Dutzow and Washington.

This also includes Deutschheim Historic Site.
 
This includes Interstate 70 in Missouri between exits 188 and 200.
 
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 3855 9097 3854 9122 3857 9138 3865 9147
      3876 9146 3884 9145 3884 9096 3856 9097
TIME...MOT...LOC 0433Z 306DEG 35KT 3882 9124 3871 9142 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

CVKING

819 
WWUS53 KLSX 100458
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1158 PM CDT Fri Jul 9 2021

MOC071-073-139-100507-
/O.CAN.KLSX.SV.W.0125.000000T0000Z-210710T0515Z/
Montgomery MO-Franklin MO-Gasconade MO-
1158 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONTGOMERY...
NORTHWESTERN FRANKLIN AND NORTHEASTERN GASCONADE COUNTIES 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 east central
Missouri.

LAT...LON 3874 9128 3884 9126 3884 9096 3855 9097
      3857 9102 3860 9104 3861 9105 3861 9108
      3860 9113 3862 9123 3865 9123 3870 9130
TIME...MOT...LOC 0457Z 348DEG 36KT 3861 9118 3850 9136 

$$

MOC219-100515-
/O.CON.KLSX.SV.W.0125.000000T0000Z-210710T0515Z/
Warren MO-
1158 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR WARREN COUNTY...

At 1157 PM CDT, severe thunderstorms were located along a line
extending from New Haven to 6 miles east of Drake, moving south at 40
mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Warrenton, Wright City, New Haven, Marthasville, Truesdale,
Innsbrook, Treloar, Dutzow, Foristell and Holstein.

This includes Interstate 70 in Missouri between exits 188 and 200.
 
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 3874 9128 3884 9126 3884 9096 3855 9097
      3857 9102 3860 9104 3861 9105 3861 9108
      3860 9113 3862 9123 3865 9123 3870 9130
TIME...MOT...LOC 0457Z 348DEG 36KT 3861 9118 3850 9136 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...70MPH
 
$$

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, 9:14 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, 11:10 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.