Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 4, NWS St. Louis, MO

February 28, 20174 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 3:38 PM CST for 4 counties in Missouri. It was in force for 52 min. 3 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: Feb 28, 2017, 3:38 PM CST (21:38 UTC)
Expired: Feb 28, 2017, 4:30 PM CST
In force: 52 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 21:38 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, 3:40 PM CST	HAIL 1.75	1 Nw Cadet, MO
Feb 28, 3:49 PM CST	FUNNEL CLOUD	6 Se Cadet, MO	OBSERVED FROM THE ENTRANCE TO TERRE DU LAC LAKE...LOOKING DUE NORTH
Feb 28, 3:55 PM CST	HAIL 1	Valles Mill, MO	PUBLIC REPORT RELAYED VIA THE MEDIA FROM VALLES MINES

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

Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 281 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: 569 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

959 
WUUS53 KLSX 282138
SVRLSX
MOC099-186-187-221-282230-
/O.NEW.KLSX.SV.W.0004.170228T2138Z-170228T2230Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southern Jefferson County in east central Missouri...
  Northwestern Ste. Genevieve County in southeastern Missouri...
  Northeastern Washington County in east central Missouri...
  Northwestern St. Francois County in southeastern Missouri...

* Until 430 PM CST.

* At 337 PM CST, a severe thunderstorm was located over Old Mines,
  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...
  Festus, Bonne Terre, De Soto, Crystal City, Potosi, Olympian
  Village, Bloomsdale, Mineral Point, Rocky Ridge, Old Mines,
  Blackwell, Cadet, Valles Mill and French Village.

This includes Interstate 55 in Missouri between exits 154 and 174.
 
This also includes  Washington State Park and St. Francois State
Park.
 
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 southwestern
Illinois...and southeastern and east central Missouri.

LAT...LON 3791 9080 3810 9081 3821 9035 3818 9033
      3816 9028 3811 9024 3809 9022 3792 9017
TIME...MOT...LOC 2137Z 253DEG 36KT 3803 9074 

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

Kanofsky

3 follow-up statements

545 
WWUS53 KLSX 282147
SVSLSX

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

MOC099-186-187-221-282230-
/O.CON.KLSX.SV.W.0004.000000T0000Z-170228T2230Z/
Jefferson MO-Ste. Genevieve MO-Washington MO-St. Francois MO-
347 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CST
FOR SOUTHERN JEFFERSON...NORTHWESTERN STE. GENEVIEVE...NORTHEASTERN
WASHINGTON AND NORTHWESTERN ST. FRANCOIS COUNTIES...

At 346 PM CST, a severe thunderstorm was located 7 miles northeast of
Mineral Point, moving east at 40 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Trained weather spotters. Golf ball hail was 
         recently reported near Cadet.

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...
Festus, Bonne Terre, De Soto, Crystal City, Olympian Village,
Bloomsdale, Rocky Ridge, Blackwell, Cadet, Valles Mill and French
Village.

This also includes  Washington State Park and St. Francois State
Park.
 
This includes Interstate 55 in Missouri between exits 154 and 174.
 
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 southwestern
Illinois...and southeastern and east central Missouri.

LAT...LON 3791 9071 3812 9074 3821 9035 3818 9033
      3816 9028 3811 9024 3809 9022 3792 9017
TIME...MOT...LOC 2146Z 253DEG 36KT 3802 9064 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Kanofsky

607 
WWUS53 KLSX 282158
SVSLSX

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

MOC221-282207-
/O.CAN.KLSX.SV.W.0004.000000T0000Z-170228T2230Z/
Washington MO-
358 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON 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 southwestern
Illinois...and southeastern and east central Missouri.

LAT...LON 3791 9060 3815 9060 3821 9035 3818 9033
      3816 9028 3811 9024 3809 9022 3792 9017
TIME...MOT...LOC 2157Z 253DEG 36KT 3805 9050 

$$

MOC099-186-187-282230-
/O.CON.KLSX.SV.W.0004.000000T0000Z-170228T2230Z/
Jefferson MO-Ste. Genevieve MO-St. Francois MO-
358 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CST
FOR SOUTHEASTERN JEFFERSON...NORTHWESTERN STE. GENEVIEVE AND
NORTHWESTERN ST. FRANCOIS COUNTIES...

At 357 PM CST, a severe thunderstorm was located near Olympian
Village, moving east at 40 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Trained weather spotters. 

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...
Festus, Bonne Terre, De Soto, Crystal City, Olympian Village,
Bloomsdale, Rocky Ridge, Valles Mill and French Village.

This also includes  St. Francois State Park.
 
This includes Interstate 55 in Missouri between exits 154 and 174.
 
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 southwestern
Illinois...and southeastern and east central Missouri.

LAT...LON 3791 9060 3815 9060 3821 9035 3818 9033
      3816 9028 3811 9024 3809 9022 3792 9017
TIME...MOT...LOC 2157Z 253DEG 36KT 3805 9050 

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...60MPH
 
$$

Kanofsky

284 
WWUS53 KLSX 282222
SVSLSX

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

MOC099-186-187-282231-
/O.EXP.KLSX.SV.W.0004.000000T0000Z-170228T2230Z/
Jefferson MO-Ste. Genevieve MO-St. Francois MO-
422 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON...
NORTHWESTERN STE. GENEVIEVE AND NORTHWESTERN ST. FRANCOIS COUNTIES
WILL EXPIRE AT 430 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 southwestern
Illinois...and southeastern and east central Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Ste. Genevieve County until 445 PM CST. 

LAT...LON 3791 9060 3815 9060 3821 9035 3818 9033
      3816 9028 3811 9024 3809 9022 3792 9017
TIME...MOT...LOC 2221Z 253DEG 36KT 3812 9023 

$$

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, 3:02 PM CST	Severe Thunderstorm Warning	LSX	Crawford, Washington	43 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.