Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 8, NWS St. Louis, MO

February 28, 2017Franklin County, Jefferson County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 28, 2017, 4:41 PM CST for Franklin County, Jefferson County, Washington County, Missouri. It was in force for 34 min. 10 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, 4:41 PM CST (22:41 UTC)
Expired: Feb 28, 2017, 5:15 PM CST
In force: 34 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Franklin County, MO, Jefferson County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 55 km from the middle of the area, began a volume at 22:41 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, 4:45 PM CST	HAIL 1	12 N Potosi, MO	DELAYED REPORT. PHOTO POSTED ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Feb 28, 4:51 PM CST	HAIL 0.7	1 N Hillsboro, MO
Feb 28, 4:51 PM CST	HAIL 1	Richwoods, MO
Feb 28, 4:55 PM CST	HAIL 1	2 E Fletcher, MO	DELAYED REPORT. PHOTO POSTED TO SOCIAL MEDIA INCLUDES A RULER FOR COMPARISON. TIME ESTIMATED FROM RADAR.
Feb 28, 4:58 PM CST	HAIL 0.88	2 N Hillsboro, MO
Feb 28, 4:58 PM CST	HAIL 1.5	2 N Hillsboro, MO
Feb 28, 5:08 PM CST	HAIL 1.75	1 Ne Antonia, MO
Feb 28, 5:09 PM CST	HAIL 1.25	2 E Antonia, MO	BASED OFF OF A PICTURE FROM FACEBOOK
Feb 28, 5:24 PM CST	HAIL 1	Old Mines, MO
Feb 28, 5:25 PM CST	HAIL 1	Hematite, 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

Lincoln, IL (KILX), launched 12:00Z, 10.7 hours before the alert went out and 275 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.

688 
WUUS53 KLSX 282241
SVRLSX
MOC071-099-221-282315-
/O.NEW.KLSX.SV.W.0008.170228T2241Z-170228T2315Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Jefferson County in east central Missouri...
  Northern Washington County in east central Missouri...
  Southeastern Franklin County in east central Missouri...

* Until 515 PM CST.

* At 440 PM CST, a severe thunderstorm was located near Richwoods,
  moving northeast at 70 mph.

  HAZARD...Golf 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...
  Festus, De Soto, Pevely, Crystal City, Herculaneum, Hillsboro,
  Byrnes Mill, High Ridge, Barnhart, Cedar Hill, Murphy, Antonia,
  Olympian Village, Cedar Hill Lakes, House Springs, Old Mines,
  Richwoods, Dittmer, Horine and Imperial.

This includes Interstate 55 in Missouri between exits 174 and 187.
 
This also includes  Washington State Park, Mastodon Historic Site,
Sandy Creek Covered Bridge Historic Site, and Gov. Dunklin's Grave
Historic Site.
 
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 3814 9106 3850 9053 3850 9049 3835 9036
      3834 9037 3830 9037 3824 9036 3819 9034
      3818 9031 3806 9061 3807 9062 3808 9064
      3805 9064 3796 9090
TIME...MOT...LOC 2240Z 235DEG 62KT 3812 9082 

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

Kanofsky

2 follow-up statements

475 
WWUS53 KLSX 282259
SVSLSX

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

MOC071-221-282309-
/O.CAN.KLSX.SV.W.0008.000000T0000Z-170228T2315Z/
Washington MO-Franklin MO-
459 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WASHINGTON AND
SOUTHEASTERN FRANKLIN COUNTIES 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 3807 9062 3808 9066 3810 9065 3809 9067
      3809 9068 3810 9068 3820 9078 3835 9075
      3850 9053 3850 9049 3835 9036 3830 9037
      3824 9036 3819 9034 3818 9032 3806 9061
TIME...MOT...LOC 2259Z 238DEG 72KT 3829 9052 

$$

MOC099-282315-
/O.CON.KLSX.SV.W.0008.000000T0000Z-170228T2315Z/
Jefferson MO-
459 PM CST TUE FEB 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CST
FOR JEFFERSON COUNTY...

At 459 PM CST, a severe thunderstorm was located near Hillsboro,
moving northeast at 85 mph.

HAZARD...Golf 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...
Festus, De Soto, Pevely, Crystal City, Herculaneum, Hillsboro, Byrnes
Mill, High Ridge, Barnhart, Cedar Hill, Murphy, Antonia, Olympian
Village, Cedar Hill Lakes, House Springs, Dittmer, Horine, Imperial,
Scotsdale and Parkdale.

This also includes  Mastodon Historic Site, Sandy Creek Covered
Bridge Historic Site, and Gov. Dunklin's Grave Historic Site.
 
This includes Interstate 55 in Missouri between exits 174 and 187.
 
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 3807 9062 3808 9066 3810 9065 3809 9067
      3809 9068 3810 9068 3820 9078 3835 9075
      3850 9053 3850 9049 3835 9036 3830 9037
      3824 9036 3819 9034 3818 9032 3806 9061
TIME...MOT...LOC 2259Z 238DEG 72KT 3829 9052 

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

Kanofsky

556 
WWUS53 KLSX 282312
SVSLSX

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

MOC099-282321-
/O.EXP.KLSX.SV.W.0008.000000T0000Z-170228T2315Z/
Jefferson MO-
512 PM CST TUE FEB 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON COUNTY WILL EXPIRE
AT 515 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 Jefferson County until 600 PM CST.

LAT...LON 3807 9062 3808 9066 3810 9065 3809 9067
      3809 9068 3810 9068 3820 9078 3835 9075
      3850 9053 3850 9049 3835 9036 3830 9037
      3824 9036 3819 9034 3818 9032 3806 9061
TIME...MOT...LOC 2311Z 235DEG 62KT 3839 9033 

$$

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, 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, 4:58 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.