Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 75, NWS St. Louis, MO

April 29, 20175 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 29, 2017, 4:42 PM CDT for 5 counties in Illinois. It was in force for 48 min. 8 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 29, 2017, 4:42 PM CDT (21:42 UTC)
Expired: Apr 29, 2017, 5:30 PM CDT
In force: 48 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bond County, IL, Fayette County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 101 km from the middle of the area, began a volume at 21:43 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, 4:48 PM CDT	TSTM WND DMG	1 Ene Farmersville, IL	2 SEMI TRUCKS BLOWN OVER ON I-55 BETWEEN MILE MARKERS 72 AND 73.
Apr 29, 4:48 PM CDT	TSTM WND DMG	1 Ne Farmersville, IL	2 SEMI TRUCKS BLOWN OVER ON I-55 BETWEEN MILE MARKERS 72 AND 73.
Apr 29, 4:49 PM CDT	HAIL 0.88	Livingston, IL
Apr 29, 4:54 PM CDT	TSTM WND GST 62	Harvel, IL
Apr 29, 4:54 PM CDT	HAIL 1	Harvel, IL
Apr 29, 4:55 PM CDT	TSTM WND GST 57	Virden, IL	WIND GUST 1 MILE EAST OF VIRDEN
Apr 29, 4:55 PM CDT	TSTM WND GST 57	Virden, IL	WIND GUST 1 MILE EAST OF VIRDEN.
Apr 29, 5:04 PM CDT	TSTM WND DMG	Litchfield, IL	POWER LINES DOWN 1 MILE EAST OF LITCHFIELD.

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 29, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.7 hours before the alert went out and 126 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: 776 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 568 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

650 
WUUS53 KLSX 292142
SVRLSX
ILC005-051-117-119-135-292230-
/O.NEW.KLSX.SV.W.0075.170429T2142Z-170429T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
442 PM CDT SAT APR 29 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Bond County in south central Illinois...
  Northeastern Madison County in southwestern Illinois...
  Northwestern Fayette County in south central Illinois...
  Eastern Macoupin County in southwestern Illinois...
  Montgomery County in south central Illinois...

* Until 530 PM CDT.

* At 442 PM CDT, severe thunderstorms were located along a line
  extending from Girard to near Litchfield to near Alhambra, moving
  northeast at 50 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...
  Litchfield, Hillsboro, Carlinville, Staunton, Virden, Gillespie,
  Nokomis, Girard, Mount Olive, Benld, Ramsey, Raymond, Witt, White
  Oak, Livingston, Farmersville, Taylor Springs, Coffeen, Alhambra
  and Schram City.

This includes Interstate 55 in Illinois between exits 37 and 63.
 
This also includes  Ramsey Lake State Park and Lake Lou Yaeger.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3883 8976 3943 8992 3953 8977 3952 8953
      3935 8953 3935 8914 3922 8914 3921 8891
TIME...MOT...LOC 2142Z 231DEG 44KT 3946 8981 3925 8969 3891 8970 

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

CVKING

2 follow-up statements

223 
WWUS53 KLSX 292204
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
504 PM CDT SAT APR 29 2017

ILC119-292213-
/O.CAN.KLSX.SV.W.0075.000000T0000Z-170429T2230Z/
Madison IL-
504 PM CDT SAT APR 29 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MADISON COUNTY IN
SOUTHWESTERN ILLINOIS IS CANCELLED...

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

A severe thunderstorm watch remains in effect until 1000 PM CDT for
south central and southwestern Illinois.

LAT...LON 3895 8948 3948 8985 3953 8977 3952 8953
      3935 8953 3935 8914 3922 8914 3921 8891
TIME...MOT...LOC 2203Z 231DEG 44KT 3962 8956 3941 8944 3907 8945 

$$

ILC005-051-117-135-292230-
/O.CON.KLSX.SV.W.0075.000000T0000Z-170429T2230Z/
Bond IL-Fayette IL-Macoupin IL-Montgomery IL-
504 PM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTH CENTRAL BOND...NORTHWESTERN FAYETTE...NORTHEASTERN MACOUPIN
AND MONTGOMERY COUNTIES...

At 503 PM CDT, severe thunderstorms were located along a line
extending from near Pawnee to Morrisonville to near Coffeen, moving
northeast at 50 mph.

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

SOURCE...Trained weather spotters observed wind speeds of 60 mph 
         and quarter size hail. 

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

Locations impacted include...
Litchfield, Hillsboro, Virden, Nokomis, Girard, Ramsey, Raymond,
Witt, White Oak, Farmersville, Taylor Springs, Coffeen, Schram City,
Irving, Panama, Fillmore, Coalton, Waggoner, Harvel and Donnellson.

This also includes  Ramsey Lake State Park and Lake Lou Yaeger.
 
This includes Interstate 55 in Illinois between exits 60 and 63.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3895 8948 3948 8985 3953 8977 3952 8953
      3935 8953 3935 8914 3922 8914 3921 8891
TIME...MOT...LOC 2203Z 231DEG 44KT 3962 8956 3941 8944 3907 8945 

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

CVKING

158 
WWUS53 KLSX 292218
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
518 PM CDT SAT APR 29 2017

ILC117-292227-
/O.CAN.KLSX.SV.W.0075.000000T0000Z-170429T2230Z/
Macoupin IL-
518 PM CDT SAT APR 29 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MACOUPIN COUNTY
IS CANCELLED...

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

A severe thunderstorm watch remains in effect until 1000 PM CDT for
south central Illinois.

LAT...LON 3895 8948 3935 8945 3935 8914 3922 8914
      3921 8891
TIME...MOT...LOC 2217Z 223DEG 46KT 3946 8937 3923 8930 3895 8937 

$$

ILC005-051-135-292230-
/O.CON.KLSX.SV.W.0075.000000T0000Z-170429T2230Z/
Bond IL-Fayette IL-Montgomery IL-
518 PM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTH CENTRAL BOND...NORTHWESTERN FAYETTE AND SOUTHEASTERN
MONTGOMERY COUNTIES...

At 517 PM CDT, severe thunderstorms were located along a line
extending from near Morrisonville to near Witt to Woburn, moving
northeast at 55 mph.

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

SOURCE...Trained weather spotters and Emergency Management have 
         reported wind damage and hail with this line of 
         thunderstorms. 

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

Locations impacted include...
Hillsboro, Nokomis, Ramsey, Witt, Coffeen, Schram City, Irving,
Fillmore, Coalton, Donnellson, Ohlman, Bingham, Wenonah, Chapman and
Bayle City.

This also includes  Ramsey Lake State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3895 8948 3935 8945 3935 8914 3922 8914
      3921 8891
TIME...MOT...LOC 2217Z 223DEG 46KT 3946 8937 3923 8930 3895 8937 

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

CVKING

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, 12:41 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	49 min
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, 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

Nearby

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.