1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lincoln, IL wrote its last area forecast discussion before the first event at May 1, 7:17 PM CST, 2 hours 41 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LINCOLN IL 817 PM CDT MON MAY 1 2006 .DISCUSSION...LATEST SURFACE ANALYSIS HAD WEAK LOW PRESSURE OVER SOUTHERN ILLINOIS. AN ASSOCIATED WARM FRONT EXTENDED EAST INTO THE OHIO VALLEY...WITH A COLD FRONT EXTENDING SOUTHWEST INTO THE SOUTHERN PLAINS. ALOFT...A VIGOROUS SHORT WAVE WAS JUST ABOUT TO ENTER CENTRAL/SOUTHERN ILLINOIS FROM THE WEST. AN AXIS OF INSTABILITY WAS EVIDENT TO THE EAST OF THE SURFACE LOW/UPPER WAVE. THUNDERSTORMS SHOULD CONTINUE TO FIRE AHEAD OF THESE FEATURES THROUGH THE NIGHT. HOWEVER...THEIR SPEED OF THEIR MOVEMENT SHOULD HAVE THE PRECIPITATION EAST OF THE FORECAST AREA BY SHORTLY AFTER MIDNIGHT. GOING FORECAST IS IN GOOD SHAPE AT THE MOMENT. WILL PROBABLY NEED TO TRIM OVERNIGHT PRECIPITATION CHANCES...BUT WILL WAIT UNTIL THE STORMS PASS TO DO SO. && .PREV DISCUSSION... FORECAST CONCERNS THIS PERIOD INCLUDE PRECIP COVERAGE ALONG WITH SVR POTENTIAL TNT...AND THEN TIMING OF COLD FRONT ACRS CENTRAL IL LATE WED INTO EARLY THURSDAY. SOME MODEL DIFFERENCES SEEN EARLY ON...ESP WITH QPF LATER TNT AND AGAIN WITH THE COLD FRONT LATE WED. WL SIDE MORE WITH THE NAM INTO MIDWEEK WITH SUPPORT TOWARDS THE 00Z/12Z GFS IN THE EXTENDED PERIOD. SHORT TERM...TONIGHT THROUGH THURSDAY... LATEST SFC MAP INDICATING WEAK SFC LOW WEST OF STL WITH WARM AXIS EXTENDING FROM SRN MO INTO CNTRL MO WITH ENHANCED CONVERGENCE NOTED ALONG THE WEAK SFC LOW AND BNDRY EXTENDING EAST INTO SW IL. MSAS INDICATING BEST LI/S AND MOISTURE CONVERGENCE LOCATED ACRS SOUTHERN AND ERN MO WHERE SKIES WERE VOID OF CLOUDS MOST OF THE MORNING. INITIAL SHORTWAVE MOVING THRU THE FCST AREA EARLY THIS AFTN CAUSING ONLY A SCATTERING OF SHOWERS AND KEEPING CLOUDS OVR THE AREA. VSBL SATELLITE SHOWING SOME BREAKS DVLPG TO OUR WEST IN THE WAKE OF THE SHORTWAVE TROF WHICH SHOULD HELP PUSH TEMPS CLOSE TO 70 ACRS THE WEST. THIS COMBINED WITH SFC DEW POINTS IN THE LOW TO MID 50S SHOULD RESULT IN AT LEAST WEAK INSTABILITY IN AREAS THAT DO CLEAR OUT. 18Z ILX SOUNDING CONFIRMS WHAT WAS SEEN ON THE 12Z UPPER AIR ANALYSIS... LIMITED MOISTURE FROM 900-750 MB. HOWEVER...IF TEMPERATURES DO WARM TO AROUND 70 AND COMBINE THAT WITH MID 50S DEW POINT...THERE IS SOME WEAK INSTABILITY WHICH WOULD DEVELOP LATER THIS AFTN. MAIN EVENT AHEAD OF A MUCH MORE VIGOROUS SHORTWAVE OVER CNTRL KS WL BE LATE THIS AFTN AND OVERNIGHT...ESP ACRS THE SOUTHEAST HALF OF OUR FCST AREA WHERE A SWLY LLJ AND UPPER LVL DIFFLUENCE WL ENHANCE THE MOISTURE TRANSPORT AND LIFT. WHAT THUNDERSTORM ACTIVITY DOES GET GOING LATER TODAY AND OVERNIGHT SHOULD SHIFT EAST WITH THE SHORTWAVE ON TUESDAY ALLOWING DRIER WX TO MOVE INTO CNTRL IL. NEXT FCST CHALLENGE WL BE WITH TIMING OF CONVECTION ALONG COLD FRONT LATER WED EVENING AND OVERNIGHT. MODELS HAVE TRENDED SLOWER WITH THE FROPA FOR THIS TIME FRAME AND WILL TREND BACK ON OUR POPS TUE NIGHT TO SLIGHT CHANCE WITH 30 POPS HOLDING FOR WED. AS SHORTWAVE ENERGY DIGS INTO THE LAKES REGION...THE FRONTAL BOUNDARY WILL CONTINUE TO SHIFT SE BUT HOW FAR SOUTH OF THE OHIO VALLEY WILL BE KEY TO PRECIP CHANCES FURTHER OUT IN TIME...WITH MEDIUM MODELS STILL SHOWING SOME SPREAD IN THEIR SOLUTIONS WITH THE AMPLITUDE OF THE GREAT LAKES TROF THIS WEEKEND. LONG TERM...FRIDAY THROUGH MONDAY... AS MENTIONED ABOVE...WL TEND TO FOLLOW MORE IN LINE WITH THE GFS AND 00Z UKMET SOLUTIONS THIS PERIOD AS THEY HAVE SHOWN THE LEAST AMOUNT OF VARIABILITY. WL CONTINUE TO SHIFT THE FRONTAL BOUNDARY SOUTH OF OUR AREA ON FRIDAY WITH HIGH PRESSURE BUILDING IN FROM THE NORTH FOR THE WEEKEND. BEST CHANCES OF PRECIP APPEAR TO BE ALONG THE OHIO VALLEY AS SRN STREAM ENERGY INTERACTS WITH THE BOUNDARY WHICH WILL PRODUCE ROUNDS OF CONVECTION WHICH SHOULD EFFECTIVELY INCH THE FRONT FURTHER SOUTH. WL CONTINUE WITH LOW CHANCE POPS ON FRIDAY WITH THE HIGHEST THREAT SOUTH OF I-70 AS H5 TROF AXIS STILL LOCATED JUST TO OUR WEST. THE GFS SEEMS TO BE ONCE AGAIN SUFFERING FEEDBACK PROBLEMS LATER ON FRIDAY INTO SATURDAY WITH TOO MUCH DEVELOPMENT NOTED IN THE QPF FIELDS ACRS OUR SERN COUNTIES SAT MORNING. NEXT WAVE AND FRONTAL BOUNDARY FCST TO PUSH INTO THE NRN PLAINS AND UPPER LAKES LATE SUN INTO MONDAY WITH POPS SLOWLY INCREASING AGAIN AS WE HEAD TOWARDS MONDAY. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && BAK/SMITH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 1138 AM CDT MON MAY 1 2006 ILZ027>031-036>038-021200- KNOX-STARK-PEORIA-MARSHALL-WOODFORD-FULTON-TAZEWELL-MCLEAN- 1138 AM CDT MON MAY 1 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE ONCE AGAIN EXPECTED TO DEVELOP OVER THE AREA TODAY AND TONIGHT. THE STORMS MAY BECOME SEVERE BEGINNING EARLY IN THE AFTERNOON AND EXTEND INTO THE EARLY EVENING HOURS. LARGE HAIL AND WIND DAMAGE WILL BE THE PRIMARY SEVERE WEATHER THREATS... HOWEVER AN ISOLATED TORNADO WILL ALSO BE POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ANOTHER COLD FRONT WILL APPROACH THE AREA LATE TUESDAY NIGHT AND WEDNESDAY...BRINGING ANOTHER CHANCE FOR THUNDERSTORMS. THE HIGHEST PROBABILITY OF SEVERE WEATHER WILL BE ACROSS THE SOUTHERN HALF OF ILLINOIS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND TONIGHT. ILZ040>057-061>063-066>068-071>073-021200- SCHUYLER-MASON-LOGAN-DE WITT-PIATT-CHAMPAIGN-VERMILION-CASS- MENARD-SCOTT-MORGAN-SANGAMON-CHRISTIAN-MACON-MOULTRIE-DOUGLAS- COLES-EDGAR-SHELBY-CUMBERLAND-CLARK-EFFINGHAM-JASPER-CRAWFORD- CLAY-RICHLAND-LAWRENCE- 1138 AM CDT MON MAY 1 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE ONCE AGAIN EXPECTED TO DEVELOP OVER THE AREA TODAY AND TONIGHT. THE STORMS MAY BECOME SEVERE BEGINNING EARLY IN THE AFTERNOON AND EXTEND INTO THE EARLY EVENING HOURS. LARGE HAIL AND WIND DAMAGE WILL BE THE PRIMARY SEVERE WEATHER THREATS... HOWEVER AN ISOLATED TORNADO WILL ALSO BE POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ANOTHER COLD FRONT WILL APPROACH THE AREA LATE TUESDAY NIGHT AND WEDNESDAY...BRINGING ANOTHER CHANCE FOR THUNDERSTORMS. SEVERE STORMS WILL BE POSSIBLE LATE WEDNESDAY AFTERNOON AND ESPECIALLY WEDNESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND TONIGHT. HJS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
615 PM CDT MON MAY 01 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0546 PM TORNADO 1 E WILLIAMSFIELD 40.93N 90.00W
05/01/2006 KNOX IL LAW ENFORCEMENT
TORNADO ON THE GROUND CONFIRMED BY SHERIFF DEPUTY
&&
KELLYSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
657 PM CDT MON MAY 1 2006
ILZ027>030-036-040-020130-
FULTON-SCHUYLER-MARSHALL-KNOX-PEORIA-STARK-
657 PM CDT MON MAY 1 2006
...FUNNEL CLOUDS SIGHTED OVER CENTRAL ILLINOIS...
A FEW FUNNEL CLOUDS HAVE BEEN REPORTED EARLY THIS EVENING BY
SPOTTERS ALONG A WEAK BOUNDARY. FUNNEL CLOUDS REMAIN POSSIBLE UNTIL
SHORTLY AFTER SUNSET ALONG THIS BOUNDARY.
LOW HANGING SCUD CLOUDS CAN OFTEN APPEAR TO DIP UP AND DOWN...WHILE A
FUNNEL CLOUD WILL HAVE RAPID ROTATION OR SPINNING INDICATED.
ATMOSPHERIC CONDITIONS EXIST TODAY ACROSS CENTRAL ILLINOIS THAT DO
FAVOR THE POSSIBLE FORMATION OF WEAK CYCLONIC CIRCULATIONS ON A
PREEXISTING BOUNDARY. SOME OF THESE CIRCULATIONS ARE OCCURRING
UNDERNEATH DEVELOPING SHOWERS AND THUNDERSTORMS. WHEN THIS OCCURS...A
FUNNEL CLOUD WILL DEVELOP IN THE STRONG UPDRAFT REGION OF THE SHOWER.
ONCE THE RAIN BEGINS...THE FUNNEL CLOUD DISSIPATES. SOME OF THESE
FUNNEL CLOUDS MAY BECOME SHORT-LIVED TORNADOES AS THEY BRIEFLY TOUCH
DOWN...POSSIBLE CAUSING MINOR DAMAGE.
STAY ALERT...KEEP AN EYE ON THE SKY AND BE PREPARED TO MOVE QUICKLY
TO A SUBSTANTIAL BUILDING IF A FUNNEL CLOUD DOES APPROACH THE GROUND
IN YOUR AREA.
LAT...LON 4112 8940 4013 9038 4014 9089 4026 9044
4072 9037 4120 8984 4112 8965
BAKThe Lincoln radar (KILX), 96 km away, was scanning. The volume nearest the first event began at 03:58 UTC.
1 flash flood. Local standard time, as filed.
Very heavy rain fell in a short period of time across Shelby County. Numerous roads in the county were flooded and several had to be closed for a time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2006Every state in 2006This day in weather historyWarnings in Illinois, May 2006
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5510762.