Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 73, NWS St. Louis, MO

April 29, 20174 counties in Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 29, 2017, 3:24 PM CDT for 4 counties in Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 51 min. 13 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, 3:24 PM CDT (20:24 UTC)
Expired
Apr 29, 2017, 4:15 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Calhoun County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 40 km from the middle of the area, began a volume at 20:23 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

TimeReportWhereRemark
Apr 29, 3:39 PM CDTHAIL 1Bridgeton, MO
Apr 29, 3:48 PM CDTTSTM WND DMG4 Ese Elsah, ILPOWER LINE AND TREES DOWN ACROSS THE GREAT RIVER RD NEAR LOCKHAVEN RD, BLOCKING TRAFFIC IN BOTH DIRECTIONS. AMEREN ON SCENE NOW.
Apr 29, 3:50 PM CDTTSTM WND DMG4 Ese Elsah, ILTHE NWS CONDUCTED A DAMAGE SURVEY OF THE PIASA MARINA WHERE DAMAGE OCCURRED TO SEVERAL BOAT DOCKS, AN UNOCCUPIED BUILDING, AND SOME SURROUNDING TREES. THE SURVEY CONCLUDED THIS DAMAGE WAS THE RESULT OF A MICROBURST WITH WINDS ESTIMATED AT 80-90 MPH.
Apr 29, 3:50 PM CDTHAIL 0.5Florissant, MO
Apr 29, 3:51 PM CDTTSTM WND DMGFlorissant, MO1-FOOT DIAMETER TREE TOPPLED.
Apr 29, 3:57 PM CDTHAIL 0.25Florissant, MOPEA-SIZED HAIL.
Apr 29, 4:02 PM CDTTORNADO2 W Miles Station, ILA WEAK TORNADO CAUSED DAMAGE TO TREES AND THREE RESIDENCES NEAR THE JERSEY/MACOUPIN COUNTY BORDER. THE DAMAGE WAS RATED EF1 WITH MAXIMUM WINDS OF 90 MPH AND A WIDTH OF 50 YARDS.
Apr 29, 4:05 PM CDTTSTM WND DMGAlton, ILNUMEROUS TREE LIMBS AND A FEW TREES TWISTED, UPROOTED AND BROKEN AROUND TOWN.
Apr 29, 4:05 PM CDTHAIL 0.7Alton, IL
Apr 29, 4:06 PM CDTHAIL 0.25Alton, IL
Apr 29, 4:08 PM CDTTSTM WND DMG2 W Miles Station, ILNUMEROUS TREE LIMBS DOWN AND A FEW TREES TWISTED AND BROKEN. POSSIBLE TORNADO.
Apr 29, 4:08 PM CDTTSTM WND DMGBrighton, ILTREES/POWER LINES DOWN IN BRIGHTON AND MEDORA AREA.
Apr 29, 4:15 PM CDTHAIL 0.5Fosterburg, IL

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 12:00Z, 8.4 hours before the alert went out and 203 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2017-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2017-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 242 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

144 
WUUS53 KLSX 292024
SVRLSX
ILC013-083-117-119-MOC183-189-510-292115-
/O.NEW.KLSX.SV.W.0073.170429T2024Z-170429T2115Z/

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

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Calhoun County in southwestern Illinois...
  Western Madison County in southwestern Illinois...
  Southwestern Macoupin County in southwestern Illinois...
  Jersey County in southwestern Illinois...
  Northern St. Louis City in east central Missouri...
  Northeastern St. Charles County in east central Missouri...
  Northeastern St. Louis County in east central Missouri...

* Until 415 PM CDT.

* At 323 PM CDT, severe thunderstorms were located along a line
  extending from near Winfield to Harvester to Ballwin, moving
  northeast at 50 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  St. Louis, St. Charles, Florissant, University City, Granite City,
  Alton, Maryland Heights, Hazelwood, Collinsville, Edwardsville,
  Ferguson, Godfrey, Creve Coeur, Overland, Clayton, Jennings, St.
  Ann, Glen Carbon, Bridgeton and Bellefontaine Neighbors.

This includes Interstate 70 in Missouri near exit 231.
 
This also includes  Confluence State Park, Pere Marquette State Park,
and Horseshoe 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 3864 9042 3906 9059 3926 9009 3868 8985
TIME...MOT...LOC 2023Z 242DEG 44KT 3895 9070 3874 9058 3862 9054 

HAIL...0.75IN
WIND...60MPH
 
$$

CVKING
3 follow-up statements
927 
WWUS53 KLSX 292042
SVSLSX

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

ILC013-083-117-119-MOC183-189-510-292115-
/O.CON.KLSX.SV.W.0073.000000T0000Z-170429T2115Z/
Calhoun IL-Madison IL-Macoupin IL-Jersey IL-St. Louis City MO-
St. Charles MO-St. Louis MO-
342 PM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHEASTERN CALHOUN...WESTERN MADISON...SOUTHWESTERN MACOUPIN
AND JERSEY COUNTIES IN SOUTHWESTERN ILLINOIS...NORTHEASTERN ST.
CHARLES AND NORTHEASTERN ST. LOUIS COUNTIES IN EAST CENTRAL MISSOURI
AND NORTHERN ST. LOUIS CITY...

At 341 PM CDT, severe thunderstorms were located along a line
extending from 8 miles southeast of Hardin to Florissant to
University City, moving northeast at 50 mph.

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

SOURCE...Trained weather spotters reported quarter size hail in 
         Bridgeton. 

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

Locations impacted include...
St. Louis, St. Charles, Florissant, University City, Granite City,
Alton, Maryland Heights, Hazelwood, Collinsville, Edwardsville,
Ferguson, Godfrey, Creve Coeur, Overland, Clayton, Jennings, St. Ann,
Glen Carbon, Bridgeton and Bellefontaine Neighbors.

This also includes  Confluence State Park, Pere Marquette State Park,
and Horseshoe Lake State Park.
 
This includes Interstate 70 in Missouri near exit 231.
 
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 3906 9059 3926 9009 3868 8985 3864 9042
TIME...MOT...LOC 2041Z 245DEG 45KT 3906 9055 3882 9033 3868 9034 

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

CVKING
642 
WWUS53 KLSX 292050
SVSLSX

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

ILC013-292059-
/O.CAN.KLSX.SV.W.0073.000000T0000Z-170429T2115Z/
Calhoun IL-
350 PM CDT SAT APR 29 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CALHOUN COUNTY IS
CANCELLED...

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

LAT...LON 3909 9051 3926 9009 3868 8985 3864 9035
      3889 9038
TIME...MOT...LOC 2049Z 242DEG 44KT 3909 9047 3885 9025 3871 9026 

$$

ILC083-117-119-MOC183-189-510-292115-
/O.CON.KLSX.SV.W.0073.000000T0000Z-170429T2115Z/
Madison IL-Macoupin IL-Jersey IL-St. Louis City MO-St. Charles MO-
St. Louis MO-
350 PM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR WESTERN MADISON...SOUTHWESTERN MACOUPIN AND JERSEY COUNTIES IN
SOUTHWESTERN ILLINOIS...NORTHEASTERN ST. CHARLES AND NORTHEASTERN ST.
LOUIS COUNTIES IN EAST CENTRAL MISSOURI AND NORTHERN ST. LOUIS
CITY...

At 349 PM CDT, severe thunderstorms were located along a line
extending from 7 miles west of Jerseyville to West Alton to Flordell
Hills, moving northeast at 50 mph.

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

SOURCE...Trained weather spotters observed quarter size hail in 
         Bridgeton and cars and boats were overturned in northern 
         St. Charles County north of Kampville. 

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

Locations impacted include...
St. Louis, Florissant, University City, Granite City, Alton,
Hazelwood, Collinsville, Edwardsville, Ferguson, Godfrey, Overland,
Clayton, Jennings, Glen Carbon, Bellefontaine Neighbors, Wood River,
Troy, Bethalto, Berkeley and Jerseyville.

This also includes  Confluence State Park and Horseshoe 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 3909 9051 3926 9009 3868 8985 3864 9035
      3889 9038
TIME...MOT...LOC 2049Z 242DEG 44KT 3909 9047 3885 9025 3871 9026 

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

CVKING
276 
WWUS53 KLSX 292106
SVSLSX

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

MOC510-292116-
/O.CAN.KLSX.SV.W.0073.000000T0000Z-170429T2115Z/
St. Louis City MO-
406 PM CDT SAT APR 29 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. LOUIS CITY 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
southwestern Illinois.

LAT...LON 3873 9021 3875 9018 3877 9018 3875 9019
      3870 9027 3916 9034 3926 9009 3885 8992
TIME...MOT...LOC 2106Z 242DEG 44KT 3917 9028 3893 9006 3879 9007 

$$

ILC083-117-119-MOC183-189-292115-
/O.CON.KLSX.SV.W.0073.000000T0000Z-170429T2115Z/
Madison IL-Macoupin IL-Jersey IL-St. Charles MO-St. Louis MO-
406 PM CDT SAT APR 29 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHWESTERN MADISON...SOUTHWESTERN MACOUPIN AND EASTERN JERSEY
COUNTIES IN SOUTHWESTERN ILLINOIS...NORTHEASTERN ST. CHARLES AND
NORTHEASTERN ST. LOUIS COUNTIES IN EAST CENTRAL MISSOURI...

At 406 PM CDT, severe thunderstorms were located along a line
extending from near Jerseyville to near Bethalto to South Roxana,
moving northeast at 50 mph.

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

SOURCE...Trained weather spotters. 

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

Locations impacted include...
St. Louis, Granite City, Alton, Edwardsville, Ferguson, Godfrey,
Jennings, Bellefontaine Neighbors, Wood River, Bethalto, Jerseyville,
Black Jack, Dellwood, Madison, Riverview, Spanish Lake, East Alton,
Pine Lawn, Moline Acres and Brighton.

This also includes  Confluence 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 3873 9021 3875 9018 3877 9018 3875 9019
      3870 9027 3916 9034 3926 9009 3885 8992
TIME...MOT...LOC 2106Z 242DEG 44KT 3917 9028 3893 9006 3879 9007 

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

CVKING

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 9:14 PM CDTRiver Flood WarningLSXFayette10 days
Apr 28, 9:36 PM CDTRiver Flood WarningLSXBrown36 days
Apr 28, 9:36 PM CDTRiver Flood WarningLSXMorgan, Pike36 days
Apr 28, 9:36 PM CDTRiver Flood WarningLSXPike, Scott40 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXAdams20 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXAdams19 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXAdams10 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXPike20 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXCalhoun43 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXMadison40 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXSaint Clair16 days
Apr 28, 10:18 PM CDTRiver Flood WarningLSXJackson, Randolph43 days
Apr 29, 12:41 AM CDTSevere Thunderstorm WarningLSXRandolph49 min
Apr 29, 3:53 AM CDTFlash Flood WarningLSXRandolph22 hr
Apr 29, 9:58 AM CDTSpecial Weather StatementLSXBond47 min
Apr 29, 2:53 PM CDTSevere Thunderstorm WarningLSXCalhoun52 min
Apr 29, 3:08 PM CDTFlash Flood WarningLSXAdams, Calhoun, Pike8 hr
Apr 29, 3:56 PM CDTTornado WarningLSXJersey, Macoupin, Madison16 min
Apr 29, 4:03 PM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison, Montgomery42 min
Apr 29, 4:42 PM CDTSevere Thunderstorm WarningLSXBond, Fayette, Macoupin, Madison, Montgomery48 min
Apr 29, 5:16 PM CDTRiver Flood WarningLSXBrown7 days
Apr 29, 5:20 PM CDTFlash Flood WarningLSXCalhoun, Greene, Jersey, Macoupin, Montgomery8 hr
Apr 29, 5:29 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion, Montgomery61 min
Apr 28, 8:28 PM CDTRiver Flood WarningLSXCole7 days
Apr 28, 8:28 PM CDTRiver Flood WarningLSXOsage9 days
Apr 28, 8:28 PM CDTRiver Flood WarningLSXOsage3 days
Apr 28, 8:52 PM CDTRiver Flood WarningLSXLincoln4 days
Apr 28, 8:52 PM CDTRiver Flood WarningLSXLincoln14 days
Apr 28, 8:52 PM CDTRiver Flood WarningLSXSaint Charles69 hr
Apr 28, 9:10 PM CDTRiver Flood WarningLSXReynolds7 days
Apr 28, 9:23 PM CDTRiver Flood WarningLSXGasconade, Montgomery12 days
Apr 28, 9:23 PM CDTRiver Flood WarningLSXGasconade, Montgomery11 days
Apr 28, 9:23 PM CDTRiver Flood WarningLSXFranklin, Warren9 days
Apr 28, 9:23 PM CDTRiver Flood WarningLSXSaint Charles, Saint Louis11 days
Apr 28, 9:40 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds29 min
Apr 28, 11:33 PM CDTSpecial Weather StatementLSXFranklin42 min
Apr 28, 11:42 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds, Washington48 min
Apr 29, 1:53 AM CDTFlash Flood WarningLSXCrawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more24 hr
Apr 29, 6:44 AM CDTRiver Flood WarningLSXMadison, Saint Francois48 hr
Apr 29, 6:44 AM CDTRiver Flood WarningLSXMadison, Saint Francois50 hr
Apr 29, 10:45 AM CDTRiver Flood WarningLSXCallaway, Osage9 days
Apr 29, 1:07 PM CDTSpecial Weather StatementLSXCallaway, Cole, Osage38 min
Apr 29, 1:47 PM CDTFlash Flood WarningLSXAudrain, Boone, Callaway, Cole, Moniteau, Osage8 hr
Apr 29, 2:47 PM CDTSpecial Weather StatementLSXFranklin, Jefferson, Saint Charles, Saint Louis, Warren58 min
Apr 29, 3:17 PM CDTRiver Flood WarningLSXMadison48 hr
Apr 29, 4:45 PM CDTRiver Flood WarningLSXMonroe4 days
Apr 29, 4:55 PM CDTRiver Flood WarningLSXMarion4 days
Apr 29, 4:55 PM CDTRiver Flood WarningLSXMarion47 hr

Nearby

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