Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 71, NWS St. Louis, MO

April 29, 2017Randolph County, Illinois; Sainte Genevieve County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 29, 2017, 12:41 AM CDT for Randolph County, Illinois; Sainte Genevieve County, Missouri. It was in force for 49 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 29, 2017, 12:41 AM CDT (05:41 UTC)
Expired: Apr 29, 2017, 1:30 AM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Randolph County, IL, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 05:41 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
Apr 29, 1:02 AM CDT	HAIL 0.25	Ste. Genevieve, MO

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.7 hours before the alert went out and 280 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: 898 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 314 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

910 
WUUS53 KLSX 290541
SVRLSX
ILC157-MOC186-290630-
/O.NEW.KLSX.SV.W.0071.170429T0541Z-170429T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1241 AM CDT SAT APR 29 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...

* Until 130 AM CDT.

* At 1241 AM CDT, a severe thunderstorm was located over Weingarten,
  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...
  Chester, Ste. Genevieve, Bremen, Evansville, Baldwin, St. Mary,
  Rocky Ridge, Weingarten, Coffman, Preston, Blair, Ellis Grove,
  Kaskaskia, Walsh, Kellogg, Welge, Roots, Modoc, New Palestine and
  Minnith.

This includes Interstate 55 in Missouri between exits 141 and 154.
 
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 3776 9031 3789 9039 3821 8981 3788 8964
      3787 8965 3784 8975 3785 8979 3788 8980
      3791 8984 3787 8990 3787 8994 3778 9003
      3773 9027
TIME...MOT...LOC 0541Z 243DEG 37KT 3785 9025 

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

Britt

3 follow-up statements

054 
WWUS53 KLSX 290559
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1259 AM CDT SAT APR 29 2017

ILC157-MOC186-290630-
/O.CON.KLSX.SV.W.0071.000000T0000Z-170429T0630Z/
Randolph IL-Ste. Genevieve MO-
1259 AM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR CENTRAL RANDOLPH AND CENTRAL STE. GENEVIEVE COUNTIES...

At 1259 AM CDT, a severe thunderstorm was located over Ste.
Genevieve, moving northeast at 40 mph.

HAZARD...Ping pong 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...
Chester, Ste. Genevieve, Bremen, Evansville, Baldwin, St. Mary, Rocky
Ridge, Weingarten, Coffman, Preston, Blair, Ellis Grove, Kaskaskia,
Walsh, Kellogg, Welge, Roots, Modoc, New Palestine and Minnith.

This also includes  Hawn State Park and Felix Valle House State Park.
 
This includes Interstate 55 in Missouri between exits 141 and 154.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3783 9026 3795 9028 3821 8981 3788 8964
      3787 8965 3784 8975 3785 8979 3788 8980
      3791 8984 3787 8990 3787 8994 3778 9003
      3776 9021
TIME...MOT...LOC 0559Z 242DEG 36KT 3793 9005 

HAIL...1.50IN
WIND...60MPH
 
$$

Britt

600 
WWUS53 KLSX 290618
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
118 AM CDT SAT APR 29 2017

MOC186-290628-
/O.CAN.KLSX.SV.W.0071.000000T0000Z-170429T0630Z/
Ste. Genevieve MO-
118 AM CDT SAT APR 29 2017

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

LAT...LON 3787 8965 3784 8974 3786 8979 3788 8980
      3791 8984 3790 8988 3791 8990 3795 8991
      3797 8994 3797 8997 3800 9003 3809 9000
      3821 8981 3788 8964
TIME...MOT...LOC 0618Z 238DEG 36KT 3802 8986 

$$

ILC157-290630-
/O.CON.KLSX.SV.W.0071.000000T0000Z-170429T0630Z/
Randolph IL-
118 AM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR CENTRAL RANDOLPH COUNTY...

At 118 AM CDT, a severe thunderstorm was located near Evansville,
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, Bremen, Evansville, Baldwin, Preston, Blair, Ellis Grove,
Walsh, Welge, Roots and New Palestine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3787 8965 3784 8974 3786 8979 3788 8980
      3791 8984 3790 8988 3791 8990 3795 8991
      3797 8994 3797 8997 3800 9003 3809 9000
      3821 8981 3788 8964
TIME...MOT...LOC 0618Z 238DEG 36KT 3802 8986 

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

Britt

361 
WWUS53 KLSX 290626
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
126 AM CDT SAT APR 29 2017

ILC157-290636-
/O.EXP.KLSX.SV.W.0071.000000T0000Z-170429T0630Z/
Randolph IL-
126 AM CDT SAT APR 29 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RANDOLPH COUNTY WILL
EXPIRE AT 130 AM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 3787 8965 3784 8974 3786 8979 3788 8980
      3791 8984 3790 8988 3791 8990 3795 8991
      3797 8994 3797 8997 3800 9003 3809 9000
      3821 8981 3788 8964
TIME...MOT...LOC 0626Z 243DEG 37KT 3805 8977 

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 9:14 PM CDT	River Flood Warning	LSX	Fayette	10 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Brown	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Morgan, Pike	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Pike, Scott	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	19 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	10 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Pike	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Calhoun	43 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Madison	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Saint Clair	16 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Jackson, Randolph	43 days
Apr 29, 3:53 AM CDT	Flash Flood Warning	LSX	Randolph	22 hr
Apr 29, 9:58 AM CDT	Special Weather Statement	LSX	Bond	47 min
Apr 29, 2:53 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	52 min
Apr 29, 3:08 PM CDT	Flash Flood Warning	LSX	Adams, Calhoun, Pike	8 hr
Apr 29, 3:24 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Macoupin, Madison	51 min
Apr 29, 3:56 PM CDT	Tornado Warning	LSX	Jersey, Macoupin, Madison	16 min
Apr 29, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison, Montgomery	42 min
Apr 29, 4:42 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	48 min
Apr 29, 5:16 PM CDT	River Flood Warning	LSX	Brown	7 days
Apr 29, 5:20 PM CDT	Flash Flood Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Montgomery	8 hr
Apr 29, 5:29 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion, Montgomery	61 min
Apr 28, 8:28 PM CDT	River Flood Warning	LSX	Cole	7 days
Apr 28, 8:28 PM CDT	River Flood Warning	LSX	Osage	9 days
Apr 28, 8:28 PM CDT	River Flood Warning	LSX	Osage	3 days
Apr 28, 8:52 PM CDT	River Flood Warning	LSX	Lincoln	4 days
Apr 28, 8:52 PM CDT	River Flood Warning	LSX	Lincoln	14 days
Apr 28, 8:52 PM CDT	River Flood Warning	LSX	Saint Charles	69 hr
Apr 28, 9:10 PM CDT	River Flood Warning	LSX	Reynolds	7 days
Apr 28, 9:23 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	12 days
Apr 28, 9:23 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	11 days
Apr 28, 9:23 PM CDT	River Flood Warning	LSX	Franklin, Warren	9 days
Apr 28, 9:23 PM CDT	River Flood Warning	LSX	Saint Charles, Saint Louis	11 days
Apr 28, 9:40 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	29 min
Apr 28, 11:33 PM CDT	Special Weather Statement	LSX	Franklin	42 min
Apr 28, 11:42 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds, Washington	48 min
Apr 29, 1:53 AM CDT	Flash Flood Warning	LSX	Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more	24 hr
Apr 29, 6:44 AM CDT	River Flood Warning	LSX	Madison, Saint Francois	48 hr
Apr 29, 6:44 AM CDT	River Flood Warning	LSX	Madison, Saint Francois	50 hr
Apr 29, 10:45 AM CDT	River Flood Warning	LSX	Callaway, Osage	9 days
Apr 29, 1:07 PM CDT	Special Weather Statement	LSX	Callaway, Cole, Osage	38 min
Apr 29, 1:47 PM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Osage	8 hr
Apr 29, 2:47 PM CDT	Special Weather Statement	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Warren	58 min
Apr 29, 3:17 PM CDT	River Flood Warning	LSX	Madison	48 hr
Apr 29, 4:45 PM CDT	River Flood Warning	LSX	Monroe	4 days
Apr 29, 4:55 PM CDT	River Flood Warning	LSX	Marion	4 days
Apr 29, 4:55 PM CDT	River Flood Warning	LSX	Marion	47 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 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.