Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 4, NWS St. Louis, MO

April 3, 2018Crawford County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 3, 2018, 2:20 PM CDT for Crawford County, Washington County, Missouri. It was in force for 40 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: Apr 3, 2018, 2:20 PM CDT (19:20 UTC)
Expired: Apr 3, 2018, 3:00 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Crawford County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 19:19 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
Apr 3, 2:48 PM CDT	HAIL 1	Potosi, MO	0.75 MILES NORTH OF POTOSI ON HIGHWAY 21.
Apr 3, 2:49 PM CDT	HAIL 1	1 Se Potosi, MO

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
Apr 3, 1:33 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.3 hours before the alert went out and 271 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: 893 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 514 m²/s²
0-3 km storm-relative helicity: 499 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

858 
WUUS53 KLSX 031920
SVRLSX
MOC055-221-032000-
/O.NEW.KLSX.SV.W.0004.180403T1920Z-180403T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
220 PM CDT TUE APR 3 2018

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  East central Crawford County in east central Missouri...
  Central Washington County in east central Missouri...

* Until 300 PM CDT.

* At 220 PM CDT, a severe thunderstorm was located 8 miles northeast
  of Cherryville, moving east at 40 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. 

* Locations impacted include...
  Potosi, Mineral Point, Old Mines, Latty and Shirley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 800 PM CDT for east central
Missouri.

LAT...LON 3783 9123 3797 9124 3814 9073 3787 9066
TIME...MOT...LOC 1920Z 252DEG 34KT 3792 9115 

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

KD

3 follow-up statements

555 
WWUS53 KLSX 031930
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
230 PM CDT TUE APR 3 2018

MOC055-031940-
/O.CAN.KLSX.SV.W.0004.000000T0000Z-180403T2000Z/
Crawford MO-
230 PM CDT TUE APR 3 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CRAWFORD COUNTY
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 800 PM CDT for east central
Missouri.

LAT...LON 3799 9110 3802 9109 3814 9073 3787 9066
      3784 9110
TIME...MOT...LOC 1930Z 252DEG 34KT 3795 9104 

$$

MOC221-032000-
/O.CON.KLSX.SV.W.0004.000000T0000Z-180403T2000Z/
Washington MO-
230 PM CDT TUE APR 3 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR CENTRAL WASHINGTON COUNTY...

At 230 PM CDT, a severe thunderstorm was located 9 miles south of
Anthonies Mill, moving east at 40 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...
Potosi, Mineral Point, Old Mines, Latty and Shirley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 800 PM CDT for east central
Missouri.

LAT...LON 3799 9110 3802 9109 3814 9073 3787 9066
      3784 9110
TIME...MOT...LOC 1930Z 252DEG 34KT 3795 9104 

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

KD

540 
WWUS53 KLSX 031935
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
235 PM CDT TUE APR 3 2018

MOC221-032000-
/O.CON.KLSX.SV.W.0004.000000T0000Z-180403T2000Z/
Washington MO-
235 PM CDT TUE APR 3 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR CENTRAL WASHINGTON COUNTY...

At 235 PM CDT, a severe thunderstorm was located 9 miles southeast of
Anthonies Mill, moving east at 40 mph.

HAZARD...Two inch 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...
Potosi, Mineral Point, Old Mines, Latty and Shirley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

A tornado watch remains in effect until 800 PM CDT for east central
Missouri.

LAT...LON 3799 9106 3803 9103 3814 9073 3787 9066
      3786 9103
TIME...MOT...LOC 1935Z 252DEG 34KT 3797 9098 

HAIL...2.00IN
WIND...60MPH
 
$$

KD

774 
WWUS53 KLSX 031956
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
256 PM CDT TUE APR 3 2018

MOC221-032006-
/O.EXP.KLSX.SV.W.0004.000000T0000Z-180403T2000Z/
Washington MO-
256 PM CDT TUE APR 3 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WASHINGTON COUNTY WILL
EXPIRE AT 300 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A tornado watch remains in effect until 800 PM CDT for east central
Missouri.

LAT...LON 3799 9106 3803 9103 3814 9073 3787 9066
      3786 9103
TIME...MOT...LOC 1956Z 272DEG 42KT 3796 9069 

$$

KD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 10:37 PM CDT	Special Weather Statement	LSX	Iron, Madison, Saint Francois	53 min
Apr 2, 11:13 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	32 min
Apr 2, 11:16 PM CDT	Special Weather Statement	LSX	Crawford	29 min
Apr 2, 11:22 PM CDT	Special Weather Statement	LSX	Saint Charles	38 min
Apr 3, 12:02 AM CDT	Special Weather Statement	LSX	Saint Louis, City of Saint Louis	43 min
Apr 3, 12:38 AM CDT	Special Weather Statement	LSX	City of Saint Louis	52 min
Apr 3, 4:27 AM CDT	Freeze Warning	LSX	Iron, Madison, Reynolds	30 hr
Apr 3, 2:02 PM CDT	Special Weather Statement	LSX	Crawford, Washington	43 min
Apr 3, 2:37 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Washington	38 min
Apr 3, 2:51 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	39 min
Apr 3, 3:13 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	47 min
Apr 3, 3:14 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois	46 min
Apr 3, 3:26 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	49 min
Apr 3, 3:46 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds	49 min
Apr 3, 3:58 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Sainte Genevieve, Saint Francois	25 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2018 Every severe thunderstorm warning in 2018

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.