Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 135, NWS St. Louis, MO

July 29, 2021Monroe County, Pike County, Ralls County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 29, 2021, 7:06 PM CDT for Monroe County, Pike County, Ralls County, Missouri. It was in force for 54 min. 1 report 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 29, 2021, 7:06 PM CDT (00:06 UTC)
Expired: Jul 29, 2021, 8:00 PM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Monroe County, MO, Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 00:09 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 29, 7:17 PM CDT	HAIL 0.25	4 S The Landing, MO

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 00:00Z, 0.1 hours before the alert went out and 264 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: 728 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1228 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.8

Open this sounding in Storm Lab

The text

As transmitted.

468 
WUUS53 KLSX 300006
SVRLSX
MOC137-163-173-300100-
/O.NEW.KLSX.SV.W.0135.210730T0006Z-210730T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
706 PM CDT Thu Jul 29 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southwestern Ralls County in northeastern Missouri...
  Eastern Monroe County in northeastern Missouri...
  West central Pike County in northeastern Missouri...

* Until 800 PM CDT.

* At 705 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles northeast of Paris to near Perry to near
  Spencerburg, moving southeast at 10 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.

* Severe thunderstorms will be near...
  Spencerburg around 710 PM CDT.

Other locations in the path of these severe thunderstorms include
Perry, Vandalia, Curryville and Santa Fe.

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

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3945 9137 3931 9124 3933 9172 3934 9172
      3934 9203 3963 9205
TIME...MOT...LOC 0005Z 337DEG 7KT 3956 9196 3949 9171 3941 9142 

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

Britt

3 follow-up statements

977 
WWUS53 KLSX 300024
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
724 PM CDT Thu Jul 29 2021

MOC163-300032-
/O.CAN.KLSX.SV.W.0135.000000T0000Z-210730T0100Z/
Pike MO-
724 PM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL PIKE COUNTY IN
NORTHEASTERN MISSOURI IS CANCELLED...

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

LAT...LON 3948 9147 3932 9144 3933 9172 3934 9172
      3934 9203 3959 9205 3949 9152
TIME...MOT...LOC 0022Z 312DEG 9KT 3951 9188 3948 9166 

$$

MOC137-173-300100-
/O.CON.KLSX.SV.W.0135.000000T0000Z-210730T0100Z/
Ralls MO-Monroe MO-
724 PM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR SOUTHWESTERN RALLS AND SOUTHEASTERN MONROE COUNTIES...

At 722 PM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Paris to near Perry, moving southeast
at 10 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Perry and Santa Fe.

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

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3948 9147 3932 9144 3933 9172 3934 9172
      3934 9203 3959 9205 3949 9152
TIME...MOT...LOC 0022Z 312DEG 9KT 3951 9188 3948 9166 

HAIL...0.75IN
WIND...60MPH
 
$$

Britt

398 
WWUS53 KLSX 300038
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
738 PM CDT Thu Jul 29 2021

MOC173-300047-
/O.CAN.KLSX.SV.W.0135.000000T0000Z-210730T0100Z/
Ralls MO-
738 PM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN RALLS COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 3934 9172 3934 9203 3955 9204 3952 9175
TIME...MOT...LOC 0037Z 350DEG 8KT 3949 9194 

$$

MOC137-300100-
/O.CON.KLSX.SV.W.0135.000000T0000Z-210730T0100Z/
Monroe MO-
738 PM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR SOUTHEASTERN MONROE COUNTY...

At 737 PM CDT, a severe thunderstorm was located near Paris, moving
south at 10 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Paris, Santa Fe and Florida. 

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

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

&&

LAT...LON 3934 9172 3934 9203 3955 9204 3952 9175
TIME...MOT...LOC 0037Z 350DEG 8KT 3949 9194 

HAIL...0.75IN
WIND...60MPH
 
$$

Britt

123 
WWUS53 KLSX 300056
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
756 PM CDT Thu Jul 29 2021

MOC137-300106-
/O.EXP.KLSX.SV.W.0135.000000T0000Z-210730T0100Z/
Monroe MO-
756 PM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONROE COUNTY
WILL EXPIRE AT 800 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3934 9172 3934 9203 3955 9204 3952 9175
TIME...MOT...LOC 0056Z 337DEG 7KT 3946 9193 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 9:00 PM CDT	Areal Flood Advisory	LSX	Monroe, Shelby	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.