Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 3, NWS St. Louis, MO

February 28, 2017Crawford County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 3:02 PM CST for Crawford County, Washington County, Missouri. It was in force for 43 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: Feb 28, 2017, 3:02 PM CST (21:02 UTC)
Expired: Feb 28, 2017, 3:45 PM CST
In force: 43 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), 90 km from the middle of the area, began a volume at 21:03 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
Feb 28, 3:25 PM CST	HAIL 1	7 Wnw 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
Feb 28, 2:19 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.0 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: 573 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 379 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

As transmitted.

845 
WUUS53 KLSX 282102
SVRLSX
MOC055-221-282145-
/O.NEW.KLSX.SV.W.0003.170228T2102Z-170228T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
302 PM CST TUE FEB 28 2017

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 345 PM CST.

* At 301 PM CST, a severe thunderstorm was located 7 miles northeast
  of Cherryville, moving east at 50 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 900 PM CST for east central
Missouri.

LAT...LON 3783 9121 3799 9128 3817 9077 3787 9065
TIME...MOT...LOC 2101Z 249DEG 42KT 3792 9118 

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

Kanofsky

2 follow-up statements

514 
WWUS53 KLSX 282118
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
318 PM CST TUE FEB 28 2017

MOC055-282128-
/O.CAN.KLSX.SV.W.0003.000000T0000Z-170228T2145Z/
Crawford MO-
318 PM CST TUE FEB 28 2017

...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 900 PM CST for east central
Missouri.

LAT...LON 3799 9109 3806 9109 3817 9077 3787 9065
      3784 9110
TIME...MOT...LOC 2118Z 249DEG 42KT 3799 9094 

$$

MOC221-282145-
/O.CON.KLSX.SV.W.0003.000000T0000Z-170228T2145Z/
Washington MO-
318 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CST
FOR CENTRAL WASHINGTON COUNTY...

At 318 PM CST, a severe thunderstorm was located 9 miles northwest of
Potosi, moving east at 50 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 900 PM CST for east central
Missouri.

LAT...LON 3799 9109 3806 9109 3817 9077 3787 9065
      3784 9110
TIME...MOT...LOC 2118Z 249DEG 42KT 3799 9094 

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

Kanofsky

994 
WWUS53 KLSX 282140
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
340 PM CST TUE FEB 28 2017

MOC221-282150-
/O.EXP.KLSX.SV.W.0003.000000T0000Z-170228T2145Z/
Washington MO-
340 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WASHINGTON COUNTY WILL
EXPIRE AT 345 PM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 900 PM CST for east central
Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Washington County until 430 PM CST.

LAT...LON 3799 9109 3806 9109 3817 9077 3787 9065
      3784 9110
TIME...MOT...LOC 2140Z 249DEG 42KT 3808 9064 

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 12:50 PM CST	Wind Advisory	LSX	Audrain, Boone, Callaway, Cole, Gasconade, Knox and 11 more	5 hr
Feb 28, 2:32 PM CST	Severe Thunderstorm Warning	LSX	Crawford	43 min
Feb 28, 3:38 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	52 min
Feb 28, 4:01 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	44 min
Feb 28, 4:07 PM CST	Severe Thunderstorm Warning	LSX	Sainte Genevieve	26 min
Feb 28, 4:15 PM CST	Severe Thunderstorm Warning	LSX	Lincoln	32 min
Feb 28, 4:41 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Washington	34 min
Feb 28, 4:58 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	33 min
Feb 28, 5:10 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	33 min
Feb 28, 5:16 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Washington	44 min
Feb 28, 5:29 PM CST	Severe Thunderstorm Warning	LSX	City of Saint Louis	46 min
Feb 28, 5:36 PM CST	Severe Thunderstorm Warning	LSX	Jefferson	39 min
Feb 28, 5:44 PM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	31 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017 Every severe thunderstorm warning in 2017

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.