Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS St. Louis, MO

May 3, 2021Lewis County, Marion County, Shelby County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 3, 2021, 2:22 PM CDT for Lewis County, Marion County, Shelby County, Missouri. It was in force for 38 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: May 3, 2021, 2:22 PM CDT (19:22 UTC)
Expired: May 3, 2021, 3:00 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Lewis County, MO, Marion County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 172 km from the middle of the area, began a volume at 19:26 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
May 3, 2:41 PM CDT	HAIL 1.75	3 Se Ewing, MO	REPORT OF GOLF BALL SIZED HAIL IN DURHAM, MO.
May 3, 2:50 PM CDT	HAIL 1.25	Maywood, MO	REPORTED IN MAYWOOD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.4 hours before the alert went out and 197 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: 29 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

523 
WUUS53 KLSX 031922
SVRLSX
MOC111-127-205-032000-
/O.NEW.KLSX.SV.W.0030.210503T1922Z-210503T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
222 PM CDT Mon May 3 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Marion County in northeastern Missouri...
  Northeastern Shelby County in northeastern Missouri...
  Lewis County in northeastern Missouri...

* Until 300 PM CDT.

* At 222 PM CDT, a severe thunderstorm was located near Steffenville,
  moving northeast at 35 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...
  Canton, La Grange, Lewistown, Ewing, Maywood, Steffenville, Taylor
  and Monticello.

This also includes Wakonda State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4018 9151 4012 9151 4006 9149 4003 9150
      3992 9143 3984 9189 3997 9196 4004 9195
      4020 9156 4020 9150
TIME...MOT...LOC 1922Z 240DEG 29KT 3995 9181 

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

Glass

2 follow-up statements

779 
WWUS53 KLSX 031932
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
232 PM CDT Mon May 3 2021

MOC205-031942-
/O.CAN.KLSX.SV.W.0030.000000T0000Z-210503T2000Z/
Shelby MO-
232 PM CDT Mon May 3 2021

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

LAT...LON 4006 9149 4003 9150 3992 9143 3985 9184
      3995 9183 4003 9181 4013 9162 4015 9151
      4012 9151
TIME...MOT...LOC 1932Z 243DEG 28KT 3996 9171 

$$

MOC111-127-032000-
/O.CON.KLSX.SV.W.0030.000000T0000Z-210503T2000Z/
Marion MO-Lewis MO-
232 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR NORTHWESTERN MARION AND SOUTHEASTERN LEWIS COUNTIES...

At 232 PM CDT, a severe thunderstorm was located near Ewing, moving
northeast at 30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Canton, La Grange, Ewing, Maywood and Taylor. 

This also includes Wakonda State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4006 9149 4003 9150 3992 9143 3985 9184
      3995 9183 4003 9181 4013 9162 4015 9151
      4012 9151
TIME...MOT...LOC 1932Z 243DEG 28KT 3996 9171 

HAIL...1.50IN
WIND...60MPH
 
$$

Glass

138 
WWUS53 KLSX 031940
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
240 PM CDT Mon May 3 2021

MOC111-127-032000-
/O.CON.KLSX.SV.W.0030.000000T0000Z-210503T2000Z/
Marion MO-Lewis MO-
240 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR NORTHWESTERN MARION AND SOUTHEASTERN LEWIS COUNTIES...

At 240 PM CDT, a severe thunderstorm was located over Maywood, moving
east at 50 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
La Grange, Ewing, Maywood and Taylor. 

This also includes Wakonda State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4006 9149 4003 9150 3992 9143 3988 9175
      3995 9176 4002 9170 4005 9160
TIME...MOT...LOC 1940Z 266DEG 42KT 3996 9162 

HAIL...1.50IN
WIND...60MPH
 
$$

Glass

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 2:42 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	29 min
May 3, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	51 min

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.