Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 64, NWS St. Louis, MO

April 26, 2017Sainte Genevieve County, Saint Francois County, Missouri; Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 26, 2017, 1:14 PM CDT for Sainte Genevieve County, Saint Francois County, Missouri; Randolph County, Illinois. It was in force for 46 min. 4 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 26, 2017, 1:14 PM CDT (18:14 UTC)
Expired: Apr 26, 2017, 2:00 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Randolph County, IL, Saint Francois County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 18:14 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 26, 1:41 PM CDT	TSTM WND DMG	Chester, IL	TREE ON HOUSE.
Apr 26, 1:47 PM CDT	TSTM WND GST 70	Chester, IL
Apr 26, 1:50 PM CDT	TSTM WND DMG	Chester, IL	SEVERAL TREE LIMBS DOWN ON THE NORTH END OF TOWN. 4 TO 5 DIAMETER.
Apr 26, 1:53 PM CDT	TSTM WND DMG	Chester, IL	SEVERAL TREE LIMBS DOWN. 3 DIAMETER.

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 26, 12:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.2 hours before the alert went out and 282 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: 1086 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

482 
WUUS53 KLSX 261814
SVRLSX
ILC157-MOC186-187-261900-
/O.NEW.KLSX.SV.W.0064.170426T1814Z-170426T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
114 PM CDT WED APR 26 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Central Randolph County in southwestern Illinois...
  Ste. Genevieve County in southeastern Missouri...
  Southeastern St. Francois County in southeastern Missouri...

* Until 200 PM CDT.

* At 112 PM CDT, a severe thunderstorm was located near Womac, moving
  northeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. At 108 pm a storm spotter reported that 
           a flag pole was snapped in Fredrecktown. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Farmington, Chester, Ste. Genevieve, Bremen, Steeleville,
  Evansville, Baldwin, St. Mary, Weingarten, Womac, Coffman, Preston,
  Blair, Ellis Grove, Kaskaskia, Roots, Modoc, New Palestine, Shiloh
  Hill and Minnith.

This includes Interstate 55 in Missouri between exits 141 and 150.
 
This also includes  Hawn State Park and Felix Valle House State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3780 9041 3819 8986 3797 8959 3793 8961
      3785 8976 3785 8979 3788 8980 3791 8984
      3787 8990 3787 8994 3783 8999 3765 9013
      3764 9015 3764 9024
TIME...MOT...LOC 1812Z 232DEG 34KT 3773 9022 

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

Carney

1 follow-up statement

100 
WWUS53 KLSX 261833
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
133 PM CDT WED APR 26 2017

MOC187-261843-
/O.CAN.KLSX.SV.W.0064.000000T0000Z-170426T1900Z/
St. Francois MO-
133 PM CDT WED APR 26 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. FRANCOIS
COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 700 PM CDT for
southwestern Illinois...and southeastern Missouri.

LAT...LON 3792 9021 3819 8986 3797 8959 3793 8961
      3785 8976 3785 8979 3788 8980 3791 8984
      3787 8990 3787 8994 3783 8999 3772 9007
      3780 9015
TIME...MOT...LOC 1833Z 233DEG 36KT 3787 9002 

$$

ILC157-MOC186-261900-
/O.CON.KLSX.SV.W.0064.000000T0000Z-170426T1900Z/
Randolph IL-Ste. Genevieve MO-
133 PM CDT WED APR 26 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR CENTRAL RANDOLPH AND SOUTHEASTERN STE. GENEVIEVE COUNTIES...

At 133 PM CDT, a severe thunderstorm was located near St. Mary,
moving northeast 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...
Chester, Ste. Genevieve, Bremen, Steeleville, Evansville, Baldwin,
St. Mary, Preston, Blair, Ellis Grove, Kaskaskia, Walsh, Kellogg,
Welge, Roots, Modoc, New Palestine, Shiloh Hill, Minnith and River
Aux Vases.

This also includes  Felix Valle House State Park.
 
This includes Interstate 55 in Missouri between exits 141 and 150.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3792 9021 3819 8986 3797 8959 3793 8961
      3785 8976 3785 8979 3788 8980 3791 8984
      3787 8990 3787 8994 3783 8999 3772 9007
      3780 9015
TIME...MOT...LOC 1833Z 233DEG 36KT 3787 9002 

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

Carney

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 9:49 PM CDT	River Flood Warning	LSX	Marion	46 days
Apr 26, 3:34 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Marion, Monroe, Pike, Ralls	41 min
Apr 26, 3:45 AM CDT	Special Weather Statement	LSX	Crawford, Franklin, Gasconade, Montgomery, Warren	45 min
Apr 26, 10:59 AM CDT	Special Weather Statement	LSX	Reynolds	46 min
Apr 26, 11:41 AM CDT	Special Weather Statement	LSX	Reynolds	49 min
Apr 26, 11:55 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	50 min
Apr 26, 12:33 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Francois	42 min
Apr 26, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	51 min
Apr 26, 2:32 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	43 min
Apr 26, 3:15 PM CDT	Special Weather Statement	LSX	Marion	45 min
Apr 26, 3:24 PM CDT	Severe Thunderstorm Warning	LSX	Marion	25 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017 Severe Thunderstorm Warnings in Illinois, 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.