Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 121, NWS St. Louis, MO

July 9, 20215 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 9:36 PM CDT for 5 counties in Missouri. It was in force for 54 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, 9:36 PM CDT (02:36 UTC)
Expired: Jul 9, 2021, 10:30 PM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

Counties Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 02:39 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, 9:51 PM CDT	TSTM WND GST 80	Rensselaer, MO	NWS STORM SURVEY ESTIMATED 80 MPH WINDS JUST WEST OF RENSSELAER. MANY LARGE BRANCHES AND TREES SNAPPED ALONG WITH SOME ROOF DAMAGE TO STRUCTURES.
Jul 9, 10:00 PM CDT	TSTM WND GST 50	1 S Monroe City, MO	MISSOURI MESONET SITE.
Jul 9, 10:01 PM CDT	TSTM WND DMG	1 Sse Monroe City, MO	POWERLINES DOWN ALONG HWY W IN STANDING WATER. REPORT RELAYED COURTESY OF WGEM-TV.
Jul 9, 10:05 PM CDT	TSTM WND DMG	4 Ese Monroe City, MO	RELAYED REPORT OF MULTIPLE POWER POLES AND LINES DOWN ACROSS THE HIGHWAY. FIRE DEPT HAS BEEN DISPATCHED TO THE AREA. TIME OF OCCURRENCE IS ESTIMATED BY RADAR.
Jul 9, 10:12 PM CDT	TSTM WND DMG	3 Sse The Landing, MO	DELAYED REPORT FROM CO-OP OBSERVER NEAR CLARENCE CANNON DAM STATES SUBSTANTIAL TREE DAMAGE, OVERTURNED CAMPER TRAILERS, AND ROOF LOSS ON THE EAST SIDE OF MARK TWAIN LAKE NEAR THE DAM. TIME ESTIMATED FROM RADAR.
Jul 9, 10:13 PM CDT	TSTM WND DMG	The Landing, MO	THUNDERSTORM WINDS BLEW TREES DOWN NEAR MARK TWAIN LAKE JELLYSTONE PARK. TRAINED SPOTTER ESTIMATED WIND SPEEDS OF 60-70 MPH.
Jul 9, 10:15 PM CDT	TSTM WND DMG	4 S The Landing, MO	SIGNIFICANT DAMAGE TO THE BLACK JACK MARINA AT MARK TWAIN LAKE. TIME ESTIMATED BY RADAR.

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

Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 230 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: 1111 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

663 
WUUS53 KLSX 100236
SVRLSX
MOC127-137-163-173-205-100330-
/O.NEW.KLSX.SV.W.0121.210710T0236Z-210710T0330Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Ralls County in northeastern Missouri...
  Marion County in northeastern Missouri...
  Shelby County in northeastern Missouri...
  Northern Monroe County in northeastern Missouri...
  Northwestern Pike County in northeastern Missouri...

* Until 1030 PM CDT.

* At 936 PM CDT, a severe thunderstorm was located near Monroe City,
  moving southeast at 20 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.

* This severe thunderstorm will be near...
  Monroe City around 940 PM CDT.
  Rensselaer around 955 PM CDT.

Other locations in the path of this severe thunderstorm include
Spaulding and Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3984 9142 3979 9136 3972 9136 3960 9118
      3955 9115 3954 9110 3950 9107 3952 9230
      3995 9229
TIME...MOT...LOC 0236Z 334DEG 19KT 3971 9168 

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

Elmore

3 follow-up statements

980 
WWUS53 KLSX 100256
SVSLSX

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

MOC127-137-163-173-205-100330-
/O.CON.KLSX.SV.W.0121.000000T0000Z-210710T0330Z/
Ralls MO-Marion MO-Shelby MO-Monroe MO-Pike MO-
956 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR RALLS...MARION...SHELBY...NORTHERN MONROE AND NORTHWESTERN PIKE
COUNTIES IN NORTHEASTERN MISSOURI...

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

Locations impacted include...
  Rensselaer, Spaulding and Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3984 9142 3979 9136 3972 9136 3960 9118
      3955 9115 3954 9110 3950 9107 3952 9230
      3995 9229
TIME...MOT...LOC 0255Z 339DEG 15KT 3968 9170 

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

Elmore

046 
WWUS53 KLSX 100317
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1017 PM CDT Fri Jul 9 2021

MOC127-205-100326-
/O.CAN.KLSX.SV.W.0121.000000T0000Z-210710T0330Z/
Marion MO-Shelby MO-
1017 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR MARION AND SHELBY COUNTIES IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 3961 9230 3960 9219 3966 9218 3966 9172
      3969 9171 3969 9131 3960 9118 3955 9116
      3954 9110 3950 9107 3952 9230
TIME...MOT...LOC 0316Z 334DEG 19KT 3958 9163 

$$

MOC137-163-173-100330-
/O.CON.KLSX.SV.W.0121.000000T0000Z-210710T0330Z/
Ralls MO-Monroe MO-Pike MO-
1017 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR RALLS...NORTHERN MONROE AND NORTHWESTERN PIKE COUNTIES IN
NORTHEASTERN MISSOURI...

At 1016 PM CDT, a severe thunderstorm was located near Spaulding,
moving southeast at 20 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.

Locations impacted include...
Hannibal, Monroe City, New London, Center, Rensselaer, Spaulding,
Woodlawn, Granville, Stoutsville, Saverton, The Landing, Ilasco,
Duncans Bridge, Indian Creek and Ashburn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3961 9230 3960 9219 3966 9218 3966 9172
      3969 9171 3969 9131 3960 9118 3955 9116
      3954 9110 3950 9107 3952 9230
TIME...MOT...LOC 0316Z 334DEG 19KT 3958 9163 

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

Elmore

228 
WWUS53 KLSX 100328
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1028 PM CDT Fri Jul 9 2021

MOC137-163-173-100337-
/O.EXP.KLSX.SV.W.0121.000000T0000Z-210710T0330Z/
Ralls MO-Monroe MO-Pike MO-
1028 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR RALLS...NORTHERN MONROE AND
NORTHWESTERN PIKE COUNTIES IN NORTHEASTERN MISSOURI WILL EXPIRE AT
1030 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

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

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

Remember, a Severe Thunderstorm Warning still remains in effect for 
portions of southern Ralls and southern Monroe counties until 1100 
PM. 

LAT...LON 3961 9230 3960 9219 3966 9218 3966 9172
      3969 9171 3969 9131 3960 9118 3955 9116
      3954 9110 3950 9107 3952 9230
TIME...MOT...LOC 0327Z 334DEG 19KT 3953 9160 

$$

Elmore

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, 9:40 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.