Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 122, NWS St. Louis, MO

July 9, 20215 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 10:10 PM CDT for 5 counties in Missouri. It was in force for 50 min. 9 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, 10:10 PM CDT (03:10 UTC)
Expired: Jul 9, 2021, 11:00 PM CDT
In force: 50 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Audrain County, MO, Lincoln County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 107 km from the middle of the area, began a volume at 03:12 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, 10:10 PM CDT	TSTM WND GST 80	4 S The Landing, MO	SUBSTANTIAL DAMAGE WAS DONE TO THE BLACKJACK MARINA. NWS DAMAGE SURVEY FOUND 80 MPH THAT CAUSED SOME BOATS TO BE DAMAGED, ROOFING TO BE RIPPED OFF THE MARINA, AND EVEN PART OF THE MARINA PUSHED OFF ITS MOORING.
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.
Jul 9, 10:20 PM CDT	TSTM WND DMG	Perry, MO	ADDITIONAL REPORTS OF DOWNED POWER LINES, STRUCTURAL DAMAGE AND PARTS OF ROOF DAMAGE ALONG MAIN STREET. REPORT RELAYED BY ABC 17. TIME ESTIMATED BY RADAR.
Jul 9, 10:20 PM CDT	TSTM WND DMG	Perry, MO	POWER OUTAGES, BROKEN WINDOWS, AND DOWNED TREES. REPORT RELAYED COURTESY OF ABC 17. TIME ESTIMATED BY RADAR.
Jul 9, 10:20 PM CDT	TSTM WND GST 90	Perry, MO	NWS DAMAGE SURVEY DISCOVERED EXTENSIVE STRAIGHT LINE WIND DAMAGE ALL ACROSS THE TOWN OF PERRY. WIDESPREAD TREE DAMAGE ALONG WITH SOME STRUCTURAL DAMAGE TO SIDING AND ROOFS WAS NOTED.
Jul 9, 10:36 PM CDT	TSTM WND DMG	1 Wsw Laddonia, MO	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 WSW LADDONIA. TREE DOWN OVER RT KK JUST WEST OF HWY 19. TIME ESTIMATED BY RADAR.
Jul 9, 10:36 PM CDT	TSTM WND DMG	Rush Hill, MO	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM RUSH HILL. TREE DOWN ACROSS RT B AT FIFTH STREET. TIME ESTIMATED BY RADAR.
Jul 9, 10:57 PM CDT	TSTM WND DMG	1 W Mexico, MO	REPORT OF A 2 FOOT DIAMETER TREE BLOWN OVER AND BLOCKING CENTRAL ST. TIME ESTIMATED FROM RADAR.
Jul 9, 11:05 PM CDT	TSTM WND DMG	1 Wnw Mexico, MO	5 POWER POLES BLOWN OVER BY WIND.

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, 3.2 hours before the alert went out and 267 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.

444 
WUUS53 KLSX 100310
SVRLSX
MOC007-113-137-163-173-100400-
/O.NEW.KLSX.SV.W.0122.210710T0310Z-210710T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1010 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southwestern Ralls County in northeastern Missouri...
  Northwestern Lincoln County in east central Missouri...
  Northeastern Audrain County in central Missouri...
  Southeastern Monroe County in northeastern Missouri...
  Pike County in northeastern Missouri...

* Until 1100 PM CDT.

* At 1010 PM CDT, a severe thunderstorm was located near Center,
  moving south at 35 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...
  Perry and Center around 1015 PM CDT.

Other locations in the path of this severe thunderstorm include
Vandalia and Farber.

This also includes Mark Twain Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3952 9200 3950 9109 3913 9089 3915 9189
TIME...MOT...LOC 0310Z 338DEG 32KT 3953 9161 

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

Elmore

3 follow-up statements

451 
WWUS53 KLSX 100322
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1022 PM CDT Fri Jul 9 2021

MOC007-113-137-163-173-100400-
/O.CON.KLSX.SV.W.0122.000000T0000Z-210710T0400Z/
Ralls MO-Lincoln MO-Audrain MO-Monroe MO-Pike MO-
1022 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SOUTHWESTERN RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHWESTERN
LINCOLN COUNTY IN EAST CENTRAL MISSOURI...NORTHEASTERN AUDRAIN COUNTY
IN CENTRAL MISSOURI...SOUTHEASTERN MONROE AND PIKE COUNTIES IN
NORTHEASTERN MISSOURI...

At 1021 PM CDT, a severe thunderstorm was located near Center, moving
south at 35 mph.

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

SOURCE...Trained weather spotters reported trees down in the Mark 
         Twain Lake area.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
  Vandalia, Farber and New Hartford.

This also includes Mark Twain Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3952 9200 3950 9109 3913 9089 3915 9189
TIME...MOT...LOC 0321Z 338DEG 32KT 3943 9156 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Elmore

341 
WWUS53 KLSX 100337
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1037 PM CDT Fri Jul 9 2021

MOC007-113-137-163-173-100400-
/O.CON.KLSX.SV.W.0122.000000T0000Z-210710T0400Z/
Ralls MO-Lincoln MO-Audrain MO-Monroe MO-Pike MO-
1037 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SOUTHWESTERN RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHWESTERN
LINCOLN COUNTY IN EAST CENTRAL MISSOURI...NORTHEASTERN AUDRAIN COUNTY
IN CENTRAL MISSOURI...SOUTHEASTERN MONROE AND PIKE COUNTIES IN
NORTHEASTERN MISSOURI...

At 1036 PM CDT, a severe thunderstorm was located over Vandalia,
moving south at 35 mph.

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

SOURCE...Trained weather spotters reported power poles down in 
         eastern rural Monroe City.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Mexico, Bowling Green, Vandalia, Louisiana, Santa Fe, Perry, Eolia,
Laddonia, Center, Frankford, Farber, Curryville, Tarrants,
Spencerburg, New Hartford, Rush Hill, Whiteside, Vandiver, Edgewood
and St. Clement.

This also includes Mark Twain Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3952 9200 3950 9109 3913 9089 3915 9189
TIME...MOT...LOC 0336Z 338DEG 32KT 3930 9149 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Elmore

577 
WWUS53 KLSX 100351
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1051 PM CDT Fri Jul 9 2021

MOC007-113-137-163-173-100400-
/O.CON.KLSX.SV.W.0122.000000T0000Z-210710T0400Z/
Ralls MO-Lincoln MO-Audrain MO-Monroe MO-Pike MO-
1051 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SOUTHWESTERN RALLS COUNTY IN NORTHEASTERN MISSOURI...NORTHWESTERN
LINCOLN COUNTY IN EAST CENTRAL MISSOURI...NORTHEASTERN AUDRAIN COUNTY
IN CENTRAL MISSOURI...SOUTHEASTERN MONROE AND PIKE COUNTIES IN
NORTHEASTERN MISSOURI...

At 1050 PM CDT, a severe thunderstorm was located 7 miles west of New
Hartford, moving south at 35 mph.

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

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Mexico, Bowling Green, Vandalia, Louisiana, Santa Fe, Perry, Eolia,
Laddonia, Farber, Curryville, Tarrants, Spencerburg, New Hartford,
Rush Hill, Whiteside, Vandiver, Edgewood, St. Clement, Cyrene and
Ashley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3945 9198 3943 9105 3913 9089 3915 9189
TIME...MOT...LOC 0350Z 338DEG 32KT 3918 9143 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

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, 9:36 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, 10:32 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.