Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 52, NWS St. Louis, MO

April 4, 20174 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 4, 2017, 11:30 PM CDT for 4 counties in Missouri. It was in force for 45 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: Apr 4, 2017, 11:30 PM CDT (04:30 UTC)
Expired: Apr 5, 2017, 12:15 AM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Crawford County, MO, Franklin County, MO, Iron County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 93 km from the middle of the area, began a volume at 04:32 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 4, 11:51 PM CDT	HAIL 0.25	Sullivan, MO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 4.5 hours before the alert went out and 267 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: 326 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1384 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 312 m²/s²
0-3 km storm-relative helicity: 743 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 12.5

Open this sounding in Storm Lab

The text

As transmitted.

889 
WUUS53 KLSX 050430
SVRLSX
MOC055-071-093-221-050515-
/O.NEW.KLSX.SV.W.0052.170405T0430Z-170405T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1130 PM CDT TUE APR 4 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Eastern Crawford County in east central Missouri...
  Northwestern Iron County in southeastern Missouri...
  Washington County in east central Missouri...
  Southeastern Franklin County in east central Missouri...

* Until 1215 AM CDT.

* At 1129 PM CDT, severe thunderstorms were located along a line
  extending from near Bourbon to 7 miles southwest of Anthonies Mill
  to 6 miles east of Cherryville to near Viburnum, moving northeast
  at 45 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...
  Union, Sullivan, St. Clair, Potosi, Bourbon, Anthonies Mill,
  Viburnum, Irondale, Parkway, Mineral Point, Leasburg, Miramiguoa
  Park, Old Mines, Bixby, Richwoods, Courtois, Caledonia, St. Cloud,
  Belgrade and Stanton.

This includes Interstate 44 in Missouri between exits 214 and 242.
 
This also includes  Washington State Park, Onondaga Cave State Park,
Dillard Mill Historic Site, and Meramec State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3770 9116 3770 9124 3782 9123 3795 9125
      3819 9138 3843 9096 3820 9078 3806 9065
      3773 9066 3761 9115
TIME...MOT...LOC 0429Z 231DEG 40KT 3818 9127 3801 9118 3787 9117 3766
9118

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

Byrd

2 follow-up statements

304 
WWUS53 KLSX 050453
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1153 PM CDT TUE APR 4 2017

MOC055-093-050502-
/O.CAN.KLSX.SV.W.0052.000000T0000Z-170405T0515Z/
Crawford MO-Iron MO-
1153 PM CDT TUE APR 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CRAWFORD AND
NORTHWESTERN IRON COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3774 9102 3792 9101 3818 9108 3819 9110
      3820 9110 3821 9112 3828 9122 3843 9096
      3820 9078 3809 9068 3806 9065 3774 9066
TIME...MOT...LOC 0452Z 231DEG 40KT 3833 9104 3816 9095 3802 9094 3781
9095

$$

MOC071-221-050515-
/O.CON.KLSX.SV.W.0052.000000T0000Z-170405T0515Z/
Washington MO-Franklin MO-
1153 PM CDT TUE APR 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR WASHINGTON AND SOUTHEASTERN FRANKLIN COUNTIES...

At 1152 PM CDT, severe thunderstorms were located along a line
extending from near St. Clair to 6 miles west of Richwoods to 9 miles
southeast of Anthonies Mill to 7 miles east of Courtois, moving
northeast at 45 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...
Union, St. Clair, Potosi, Irondale, Parkway, Mineral Point, 
Miramiguoa Park, Richwoods, Old Mines, Caledonia, Belgrade, Stanton, 
Cadet, Latty, Shirley and Piney Park.

This also includes  Washington State Park and Meramec State Park.
 
This includes Interstate 44 in Missouri between exits 230 and 242.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3774 9102 3792 9101 3818 9108 3819 9110
      3820 9110 3821 9112 3828 9122 3843 9096
      3820 9078 3809 9068 3806 9065 3774 9066
TIME...MOT...LOC 0452Z 231DEG 40KT 3833 9104 3816 9095 3802 9094 3781
9095

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

Byrd

880 
WWUS53 KLSX 050510
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1210 AM CDT WED APR 5 2017

MOC071-221-050520-
/O.EXP.KLSX.SV.W.0052.000000T0000Z-170405T0515Z/
Washington MO-Franklin MO-
1210 AM CDT WED APR 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR WASHINGTON AND SOUTHEASTERN
FRANKLIN COUNTIES WILL EXPIRE AT 1215 AM CDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will 
be allowed to expire.  However gusty winds to 50 mph are still 
possible with these thunderstorms.

LAT...LON 3774 9102 3792 9101 3818 9108 3819 9110
      3820 9110 3821 9112 3828 9122 3843 9096
      3820 9078 3809 9068 3806 9065 3774 9066
TIME...MOT...LOC 0510Z 231DEG 40KT 3845 9086 3828 9077 3814 9076 3793
9077

$$

Byrd

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 10:55 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	50 min
Apr 5, 12:20 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Sainte Genevieve, Saint Francois, Saint Louis, Washington and 1 more	40 min
Apr 5, 1:27 AM CDT	Severe Thunderstorm Warning	LSX	Madison, Sainte Genevieve, Saint Francois	25 min
Apr 5, 2:18 AM CDT	Flash Flood Warning	LSX	Crawford, Iron, Washington	6 hr
Apr 5, 5:26 AM CDT	Areal Flood Advisory	LSX	Saint Louis	4 hr
Apr 5, 8:09 AM CDT	Areal Flood Warning	LSX	Crawford	3 hr
Apr 5, 9:51 AM CDT	River Flood Warning	LSX	Callaway, Osage	6 days
Apr 5, 9:51 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	6 days
Apr 5, 9:51 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	5 days
Apr 5, 9:51 AM CDT	River Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	4 days
Apr 5, 10:07 AM CDT	River Flood Warning	LSX	Lewis	3 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Lewis	8 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Marion	8 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Ralls	5 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Pike	7 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Pike	9 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Lincoln	7 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Saint Charles	11 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Saint Charles	7 days
Apr 5, 11:24 AM CDT	River Flood Warning	LSX	Perry, Sainte Genevieve	10 days
Apr 5, 1:51 PM CDT	River Flood Warning	LSX	Lincoln	37 hr
Apr 5, 4:44 PM CDT	Special Weather Statement	LSX	City of Saint Louis	46 min
Apr 5, 6:11 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr

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.