Alert archive / Illinois / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 116, NWS St. Louis, MO

April 22, 2008Monroe County, Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 22, 2008, 9:18 AM CDT for Monroe County, Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 42 min. 3 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 22, 2008, 9:18 AM CDT (14:18 UTC)
Expired: Apr 22, 2008, 10:00 AM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

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

The radar

The St Louis radar (KLSX), 101 km from the middle of the area, began a volume at 14:19 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 22, 9:23 AM CDT	HAIL 0.75	Red Bud, IL
Apr 22, 9:29 AM CDT	HAIL 1	Red Bud, IL
Apr 22, 9:30 AM CDT	HAIL 1	Red Bud, IL	SOME DAMAGE TO CARS

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 11 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 2.3 hours before the alert went out and 275 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: 13 J/kg
Mixed-layer CIN: -475 J/kg
Mixed-layer LCL: 1323 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KLSX 221418
SVRLSX
ILC133-157-MOC186-187-221500-
/O.NEW.KLSX.SV.W.0116.080422T1418Z-080422T1500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
918 AM CDT TUE APR 22 2008

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI
  STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI
  SOUTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS
  RANDOLPH COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1000 AM CDT

* AT 914 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
  STORM WAS LOCATED 5 MILES NORTH OF BLOOMSDALE...OR 11 MILES
  NORTHWEST OF STE. GENEVIEVE...AND MOVING EAST AT 47 MPH.

* LOCATIONS IMPACTED INCLUDE...
  STE. GENEVIEVE...
  EVANSVILLE...
  RED BUD...
  BALDWIN...
  BREMEN...
  SPARTA...
  STEELEVILLE...
  TILDEN...
  COULTERVILLE...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3787 9046 3804 9039 3811 9025 3814 9004
      3823 9003 3821 8960 3785 8966 3783 8972
      3790 8984 3786 8991 3787 8993 3771 9008
      3767 9019
TIME...MOT...LOC 1418Z 266DEG 41KT 3808 9014

$$

GLASS

2 follow-up statements

000 
WWUS53 KLSX 221442
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
941 AM CDT TUE APR 22 2008

ILC133-MOC187-221451-
/O.CAN.KLSX.SV.W.0116.000000T0000Z-080422T1500Z/
MONROE IL-ST. FRANCOIS MO-
941 AM CDT TUE APR 22 2008

...THE SEVERE THUNDERSTORM WARNING FOR ST. FRANCOIS AND SOUTHERN
MONROE COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF 
ST. FRANCOIS AND MONROE COUNTIES.

LAT...LON 3781 9037 3813 9008 3814 9003 3818 9004
      3822 9000 3821 8960 3785 8966 3783 8972
      3790 8984 3786 8991 3787 8993 3771 9008
      3769 9014 3770 9016 3768 9020
TIME...MOT...LOC 1441Z 269DEG 19KT 3821 8987 3798 9006

$$

ILC157-MOC186-221500-
/O.CON.KLSX.SV.W.0116.000000T0000Z-080422T1500Z/
RANDOLPH IL-STE. GENEVIEVE MO-
941 AM CDT TUE APR 22 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR STE. GENEVIEVE AND RANDOLPH COUNTIES...

AT 939 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
BALDWIN TO STE. GENEVIEVE...OR ALONG A LINE EXTENDING FROM 6 MILES
EAST OF RED BUD TO STE. GENEVIEVE...MOVING EAST AT 22 MPH.

LOCATIONS NEAR THE PATH OF SEVERE THUNDERSTORMS INCLUDE...ROOTS...
BALDWIN...HOUSTON...WALSH...PRESTON...ELLIS GROVE...ST. MARY...SPARTA
AND KASKASKIA.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3781 9037 3813 9008 3814 9003 3818 9004
      3822 9000 3821 8960 3785 8966 3783 8972
      3790 8984 3786 8991 3787 8993 3771 9008
      3769 9014 3770 9016 3768 9020
TIME...MOT...LOC 1441Z 269DEG 19KT 3821 8987 3798 9006

$$

BRITT

000 
WWUS53 KLSX 221456
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
956 AM CDT TUE APR 22 2008

ILC157-MOC186-221506-
/O.EXP.KLSX.SV.W.0116.000000T0000Z-080422T1500Z/
RANDOLPH IL-STE. GENEVIEVE MO-
956 AM CDT TUE APR 22 2008

...THE SEVERE THUNDERSTORM WARNING FOR STE. GENEVIEVE AND RANDOLPH
COUNTIES EXPIRES AT 1000 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND NO LONGER
APPEARED TO BE SEVERE.

LAT...LON 3781 9037 3813 9008 3814 9003 3818 9004
      3822 9000 3821 8960 3785 8966 3783 8972
      3790 8984 3786 8991 3787 8993 3771 9008
      3769 9014 3770 9016 3768 9020
TIME...MOT...LOC 1456Z 269DEG 19KT 3821 8977 3798 8996

$$

BRITT

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 22, 5:46 AM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, Apr 22, 5:46 AM CDT, 3 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
546 AM CDT TUE APR 22 2008

.DISCUSSION...
A WEAK COLD FRONT EXTENDS FROM NORTHWEST WISCONSIN THROUGH EASTERN
IOWA AND NORTHWEST MISSOURI TO SOUTHEAST KANSAS EARLY THIS MORNING.
CONVECTION CONTINUES TO DEVELOP ALONG AND AHEAD OF THE FRONT AS
LARGE SCALE ASCENT INCREASES UPON THE APPROACH OF A MID LEVEL
TROF/SHORTWAVE. FOCUS FOR THIS FORECAST IS ON THE CONTINUED
DEVELOPMENT AND MOVEMENT OF THIS CONVECTION AS THE COLD FRONT MOVES
TOWARD AND EVENTUALLY ACROSS THE CWA.

THIS MORNING...
CURRENTLY MUCAPES ACROSS WESTERN HALF OF THE CWA ARE AROUND 1000
J/KG WITH DEEP LAYER SHEAR VALUES LESS THAN 30KT. EXPECT THE SHEAR
TO INCREASE ACROSS THE CWA AS THE MID LEVEL TROF MOVES CLOSER THIS
MORNING...BUT REMAIN BELOW 35 KTS. SEVERE RISK LOOKS TO BE MARGINAL
AT BEST THIS MORNING...WITH HAIL BEING THE PRIMARY THREAT FROM THE
SCATTERED MULTI-CELLULAR CONVECTION.

THIS AFTERNOON...
MID LEVEL TROF/SHORTWAVE MOVES NORTHEAST OF THE CWA BY 18Z WITH WEAK
SUBSIDENCE IN ITS WAKE. NONETHELESS...WEAK CONVERGENCE ALONG THE
FRONT AND ANY OUTFLOW BOUNDARIES FROM THIS MORNINGS CONVECTION WILL
COMBINE WITH A MODERATELY UNSTABLE ATMOSPHERE...CHARACTERIZED BY
MUCAPE VALUES AROUND 2500 J/KG...TO SUPPORT ADDITIONAL THUNDERSTORM
DEVELOPMENT THROUGHOUT THE AFTERNOON. STORM MODE STILL APPEARS TO BE
MULTI-CELLULAR AS DEEP LAYER SHEAR VALUES REMAIN BELOW 35KTS. I
EXPECT THERE WILL BE ISOLATED SEVERE HAIL AND WIND REPORTS WITH THIS
CONVECTION...AND WILL HIGHLIGHT ACCORDINGLY IN THE HWO.

TONIGHT AND WEDNESDAY...
FRONT SETTLES JUST SOUTH AND EAST OF THE CWA THIS EVENING WITH
CHANCES OF MEASURABLE PRECIPITATION FALLING OFF AFTER SUNSET. GIVEN
PROXIMITY OF THE FRONTAL BOUNDARY ON WEDNESDAY...HAVE LEFT LOW
CHANCE POPS IN THE FAR SOUTHERN CWA. OTHERWISE...RISING HEIGHTS
SHOULD INSURE ANOTHER WARM APRIL DAY.

NO MAJOR CHANGES MADE PAST WEDNESDAY...

CVKING

&&

.AVIATION...
FOR THE 12Z TAFS...CDFNT CURRENTLY EXTDG FM WRN WI SW THRU NWRN MO
TO CNTRL OK WL MOVE SLOWLY SEWD THRU THE CWA TDA AND TGT. PLENTY
OF CONVECTION CONTS TO DVLP ALONG AND JUST AHD OF THIS FNT EARLY
THIS MRNG. LOOKING AT LATEST RADAR TRENDS PLAN TO INCLUDE A TEMPO
GRP OF TSRA IN COU AND UIN DURING THE FIRST COUPLE OF HRS OF THE
TAF FCST WITH VCTS IN STL AND SUS. OUTSIDE OF TSRA IT SHOULD BE
VFR WITH SCT-BKN CLOUDS ARND 4000 FT AND A MID-HI LVL CLOUD
CEILING DUE TO CONVECTIVE DEBRIS CLOUDS. MUCH OF THE MID-HI LVL
CLOUDS WILL DISSIPATE LTR THIS MRNG...BUT SHOULD HAVE PLENTY OF
DIURNAL CUMULUS CLOUDS. SCT CONVECTION SHOULD DVLP THIS AFTN ALONG
THE FNT AND ALONG ANY OLD OUTFLOW BNDRYS FM THIS MRNGS CONVECTION.
WILL INCLUDE AT LEAST A PROB30 GRP OF TSRA IN STL AND SUS LT THIS
AFTN. THE SFC WND SHOULD VEER ARND TO A NWLY DIRECTION LT THIS
AFTN IN UIN AND COU BHND THE CDFNT...AND IN STL/SUS THIS EVNG.
THERE MAY BE A BAND OF LOW LVL POST FRONTAL CLOUDINESS ARND
2000-3000 FT ADVCTG INTO THE TAF SITES BHND THE FNT.

GKS

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
IL...NONE.
&&

WFO LSX

Hazardous weather outlook, Apr 22, 4:22 AM CDT, 4 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
422 AM CDT TUE APR 22 2008

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-231200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX-LEWIS-
SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE-
CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN-
ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON-
ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS-
422 AM CDT TUE APR 22 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TODAY AS A COLD FRONT MOVES
ACROSS THE AREA. THE STRONGEST THUNDERSTORMS MAY BE CAPABLE OF
PRODUCING PENNY SIZE HAIL AND WIND GUSTS TO 60 MPH.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY NIGHT THROUGH FRIDAY.

MODERATE FLOODING WILL PERSIST FOR SOME LOCATIONS ON THE
MISSISSIPPI RIVER. SEE THE APPROPRIATE FLOOD STATEMENT FOR
SPECIFIC DETAILS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO RELAY HAIL AND SEVERE WIND REPORTS TO THE
NATIONAL WEATHER SERVICE IN ST. LOUIS.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR
WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1

CVKING

In the hours before

Local storm report, Apr 22, 8:27 AM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
827 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0816 AM     HAIL             COTTLEVILLE             38.75N 90.65W
04/22/2008  E0.88 INCH       ST. CHARLES        MO   TRAINED SPOTTER

            AT MID RIVERS MALL DRIVE AND HIGHWAY 94

0818 AM     HAIL             COTTLEVILLE             38.75N 90.65W
04/22/2008  E0.88 INCH       ST. CHARLES        MO   TRAINED SPOTTER

            MID RIVERS MALL DRIVE AND HIGHWAY N

0820 AM     HAIL             ST. PETERS              38.78N 90.61W
04/22/2008  E0.75 INCH       ST. CHARLES        MO   TRAINED SPOTTER

&&

FGLASS

Local storm report, Apr 22, 8:31 AM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
831 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 AM     HAIL             2 WSW COTTLEVILLE       38.74N 90.69W
04/22/2008  E0.88 INCH       ST. CHARLES        MO   TRAINED SPOTTER

            PENNY TO NICKEL SIZE HAIL

&&

FGLASS

Local storm report, Apr 22, 8:33 AM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
833 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0832 AM     HAIL             2 S GREENFIELD          39.32N 90.21W
04/22/2008  E0.75 INCH       GREENE             IL   TRAINED SPOTTER

&&

FGLASS

Local storm report, Apr 22, 8:53 AM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
853 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0846 AM     HAIL             HOUSE SPRINGS           38.42N 90.57W
04/22/2008  E0.75 INCH       JEFFERSON          MO   TRAINED SPOTTER

0849 AM     HAIL             ALTON                   38.90N 90.15W
04/22/2008  E0.75 INCH       MADISON            IL   TRAINED SPOTTER

&&

FGLASS

Local storm report, Apr 22, 9:05 AM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
905 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0855 AM     HAIL             EDWARDSVILLE            38.80N 89.96W
04/22/2008  E0.88 INCH       MADISON            IL   TRAINED SPOTTER

0845 AM     HAIL             MEHLVILLE               38.50N 90.32W
04/22/2008  E0.88 INCH       ST. LOUIS          MO   TRAINED SPOTTER

0857 AM     HAIL             3 S DE SOTO             38.10N 90.56W
04/22/2008  E1.00 INCH       JEFFERSON          MO   TRAINED SPOTTER

            AT US HIGHWAY 67 AND ROUTE JJ

0900 AM     HAIL             OAKVILLE                38.44N 90.32W
04/22/2008  E1.00 INCH       ST. LOUIS          MO   TRAINED SPOTTER

0902 AM     HAIL             MEHLVILLE               38.50N 90.32W
04/22/2008  E0.75 INCH       ST. LOUIS          MO   TRAINED SPOTTER

&&

FGLASS

Local storm report, Apr 22, 9:07 AM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
907 AM CDT TUE APR 22 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 AM     HAIL             EDWARDSVILLE            38.80N 89.96W
04/22/2008  E1.00 INCH       MADISON            IL   TRAINED SPOTTER

&&

FGLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 6:49 AM CDT	Severe Thunderstorm Warning	LSX	Adams	40 min
Apr 22, 7:03 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun	57 min
Apr 22, 7:22 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	38 min
Apr 22, 7:55 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	50 min
Apr 22, 8:36 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	39 min
Apr 22, 8:40 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin	50 min
Apr 22, 8:48 AM CDT	Severe Thunderstorm Warning	LSX	Madison	42 min
Apr 22, 8:55 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	50 min
Apr 22, 9:25 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	50 min
Apr 22, 9:34 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair, Washington	43 min
Apr 22, 5:11 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	64 min
Apr 22, 6:40 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Montgomery, Pike, Ralls	53 min
Apr 22, 8:16 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	44 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2008 Severe Thunderstorm Warnings in Missouri, 2008 Every severe thunderstorm warning in 2008

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.