Alert archive / Illinois / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 56, NWS St. Louis, MO

May 3, 2010Greene County, Jersey County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 3, 2010, 4:26 PM CDT for Greene County, Jersey County, Madison County, Illinois. It was in force for 49 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: May 3, 2010, 4:26 PM CDT (21:26 UTC)
Expired: May 3, 2010, 5:15 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Greene County, IL, Jersey County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 45 km from the middle of the area, began a volume at 21:26 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
May 3, 4:45 PM CDT	HAIL 0.75	3 S Nutwood, IL	HAIL REPORTED IN ROSEDALE
May 3, 4:51 PM CDT	HAIL 0.75	3 N Grafton, IL	HAIL COVERING THE GROUND
May 3, 4:52 PM CDT	HAIL 0.75	5 N Grafton, IL
May 3, 4:53 PM CDT	HAIL 1.75	Otterville, IL
May 3, 4:54 PM CDT	HAIL 1.25	3 N Grafton, IL
May 3, 4:56 PM CDT	HAIL 0.88	3 S Jerseyville, IL	HAIL COMING DOWN HARD
May 3, 4:58 PM CDT	HAIL 0.88	6 S Jerseyville, IL
May 3, 5:00 PM CDT	HAIL 1	Mcclusky, IL	HAIL COVERING THE GROUND
May 3, 5:00 PM CDT	HAIL 1.75	2 S Mcclusky, IL	PUBLIC REPORT...PASSED ON VIA JERSEY COUNTY SHERIFFS OFFICE
May 3, 5:08 PM CDT	HAIL 1	5 Se Mcclusky, IL
May 3, 5:08 PM CDT	HAIL 1.5	4 Se Mcclusky, IL
May 3, 5:08 PM CDT	HAIL 1.75	5 W Brighton, IL
May 3, 5:15 PM CDT	HAIL 0.5	Jerseyville, IL

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 8 storm reports to this severe thunderstorm warning; the first came 27 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 3, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.4 hours before the alert went out and 199 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: -135 J/kg
Mixed-layer LCL: 1437 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 72 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.

925 
WUUS53 KLSX 032126
SVRLSX
ILC061-083-119-032215-
/O.NEW.KLSX.SV.W.0056.100503T2126Z-100503T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
426 PM CDT MON MAY 3 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 515 PM CDT

* AT 421 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE   
THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL IN FOLEY.  THIS STORM WAS 
LOCATED  6 MILES NORTH OF WINFIELD...OR 7 MILES SOUTHEAST OF 
ELSBERRY...AND   MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JERSEYVILLE...GODFREY...GRAFTON...OLD KANE...ELSAH...KEMPER...
  NUTWOOD...FIELDON...OTTERVILLE...KANE...MCCLUSKY...DELHI AND
  FIDELITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...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 3895 9015 3896 9040 3897 9043 3897 9051
      3896 9052 3896 9054 3910 9060 3918 9061
      3920 9060 3922 9060 3926 9015
TIME...MOT...LOC 2126Z 271DEG 36KT 3908 9065
WIND...HAIL <50MPH 1.75IN

$$

MILLER

1 follow-up statement

364 
WWUS53 KLSX 032200
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
500 PM CDT MON MAY 3 2010

ILC061-032209-
/O.CAN.KLSX.SV.W.0056.000000T0000Z-100503T2215Z/
GREENE IL-
500 PM CDT MON MAY 3 2010

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GREENE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3925 9015 3895 9015 3896 9040 3897 9043
      3897 9051 3896 9052 3896 9054 3906 9055
      3926 9016
TIME...MOT...LOC 2159Z 271DEG 36KT 3907 9022

$$

ILC083-119-032215-
/O.CON.KLSX.SV.W.0056.000000T0000Z-100503T2215Z/
MADISON IL-JERSEY IL-
500 PM CDT MON MAY 3 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR JERSEY AND
NORTHWESTERN MADISON COUNTIES UNTIL 515 PM CDT...

AT 453 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE 
THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO GOLF BALL SIZE 
IN OTTERVILLE.  THIS STORM IS CAPABLE OF PRODUCING TENNIS BALL SIZE 
HAIL. THIS STORM WAS LOCATED NEAR JERSEYVILLE...MOVING EAST 
AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  GODFREY...KEMPER AND FIDELITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...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 3925 9015 3895 9015 3896 9040 3897 9043
      3897 9051 3896 9052 3896 9054 3906 9055
      3926 9016
TIME...MOT...LOC 2159Z 271DEG 36KT 3907 9022
WIND...HAIL <50MPH 2.50IN

$$

MILLER

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 May 3, 1:57 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, May 3, 1:57 PM CDT, 2 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
157 PM CDT MON MAY 3 2010

.DISCUSSION...
/157 PM CDT MON MAY 3 2010/

THUNDERSTORMS WILL CONTINUE TO DEVELOP AS SHORTWAVE INTERACTS WITH
AROUND 1000J/KG OF SURFACE BASED CAPE SOUTH OF AN OLD OUTFLOW
BOUNDARY LOCATED NORTH OF ST. LOUIS. SHOULD SEE THIS ACTIVITY WEAKEN
THIS EVENING WITH LOSS OF DIURNAL INSTABILITY.  SEVERE THUNDERSTORM
WATCH GOES UNTIL 8 PM CDT.

I STUCK TO A BLEND OF THE GFS/ECMWF FOR THE REST OF THE WEEK WITH
ANOTHER SHORTWAVE/COLD FRONT SET TO PASS THROUGH THE CWA ON
WEDNESDAY. MAINTAINED CHANCES FOR TSRA THURSDAY NIGHT AND FRIDAY
WITH A STRONGER SHORTWAVE/COLD FRONT MOVING ACROSS THE MIDWEST.

LOOKS LIKE A RELATIVELY COOL WEEKEND AHEAD AS HIGH PRESSURE BUILDS
ACROSS THE CENTRAL UNITED STATES. AFTERNOON HIGHS IN THE LOWER TO
MIDDLE 60S...AND OVERNIGHT LOWS IN THE LOWER 40S.

THE NEXT CHANCE OF RAIN IN THE EXTENDED WILL COME SUNDAY NIGHT AND
MONDAY WITH WARM ADVECTION.

CVKING

&&

.AVIATION...
/1226 PM CDT MON MAY 3 2010/

ISOLATED AREA OF SHRA AT KUIN WILL MOVE E OF THE TERMINAL SHORTLY
AFTER ISSUANCE...LEAVING AFTN CONVECTION AS THE PRIMARY CONCERN FOR
THIS SET OF TAFS. A CDNFT WAS MOVING SEWD THROUGH MO/IL AT 17Z WITH
INCREASING INSTABILITY AHEAD OF THE FNT DUE TO FULL MAY SUNSHINE AND
COLD AIR ADVECTION ALOFT AHEAD OF AN APPROACHING SHORTWAVE.
THUNDERSTORMS ARE EXPECTED TO DVLP SOUTHEAST OF THE FNT LATER THIS
AFTN BUT CONFIDENCE IN TSRA AT THE TERMINALS IS LOW. WINDS WILL
TURN WLY TO NWLY AFTER FROPA...BECOME LGT/VAR OVERNIGHT AS HIGH
PRESSURE BUILDS IN TO THE REGION...THEN INCREASE OUT OF THE S TO SW
WITH MORNING MIXING.

SPECIFICS FOR KSTL...TSRA/SHRA EXPECTED TO DVLP THIS AFTN AHEAD OF
AN APPROACHING CDFNT AROUND 21Z-01Z BUT LOW CONFIDENCE IN TSRA AT
THE TERMINAL PRECLUDES MORE THAN VCTS/CB IN THE TAFS ATTM. WILL
CONTINUE TO MONITOR AND AMEND AS NEEDED. OTHERWISE...PLEASE SEE
ABOVE DISCUSSION.

KANOFSKY

&&

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

WFO LSX

Hazardous weather outlook, May 3, 12:00 PM CDT, 4 hours 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1200 PM CDT MON MAY 3 2010

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-041200-
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 MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
1200 PM CDT MON MAY 3 2010

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS ARE LIKELY THIS AFTERNOON AND THIS EVENING. SOME OF
THE STORMS WILL LIKELY BECOME SEVERE AND BE CAPABLE OF PRODUCING
LARGE HAIL AND DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS ANOTHER CHANCE OF THUNDERSTORMS THURSDAY THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO RELAY ALL SEVERE WEATHER 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, May 3, 4:04 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
404 PM CDT MON MAY 03 2010

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

0401 PM     HAIL             6 N TROY                39.06N  90.98W
05/03/2010  E0.88 INCH       LINCOLN            MO   AMATEUR RADIO

            WIND ESTIMATED 30 TO 40 MPH WITH THIS STORM.

&&

TILLY

Local storm report, May 3, 4:11 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
411 PM CDT MON MAY 03 2010

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

0409 PM     HAIL             7 N TROY                39.08N  90.98W
05/03/2010  E0.50 INCH       LINCOLN            MO   AMATEUR RADIO

&&

TRUETT

Local storm report, May 3, 4:16 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
416 PM CDT MON MAY 03 2010

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

0415 PM     HAIL             5 SW ELSBERRY           39.12N  90.86W
05/03/2010  E0.25 INCH       LINCOLN            MO   PUBLIC

            AT SUN VALLEY GOLF CLUB

&&

TRUETT

Local storm report, May 3, 4:17 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
417 PM CDT MON MAY 03 2010

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

0415 PM     HAIL             7 W WINFIELD            39.00N  90.87W
05/03/2010  E0.50 INCH       LINCOLN            MO   TRAINED SPOTTER

            AT INTERSECTION OF HIGHWAY 47 AND W.

&&

TRUETT

Local storm report, May 3, 4:20 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
420 PM CDT MON MAY 03 2010

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

0416 PM     HAIL             4 WNW FOLEY             39.07N  90.81W
05/03/2010  E1.00 INCH       LINCOLN            MO   TRAINED SPOTTER

&&

TRUETT

Local storm report, May 3, 4:25 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
425 PM CDT MON MAY 03 2010

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

0424 PM     HAIL             FOLEY                   39.05N  90.74W
05/03/2010  E1.75 INCH       LINCOLN            MO   TRAINED SPOTTER

&&

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 2:12 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	48 min
May 3, 2:22 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Monroe, Saint Clair, Washington	38 min
May 3, 2:43 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	47 min
May 3, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	47 min
May 3, 3:56 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	49 min
May 3, 4:07 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	38 min
May 3, 4:50 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Madison	25 min
May 3, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	51 min
May 3, 5:47 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Madison, Montgomery	43 min
May 3, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	39 min
May 3, 6:23 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	52 min
May 3, 6:28 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2010 Every severe thunderstorm warning in 2010

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.