1 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 Chicago, IL wrote its last area forecast discussion before the first event at Sep 6, 2:00 PM CST, 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 300 PM CDT THU SEP 6 2001 WATER VAPOR LOOP SHOWS SHORT WAVE LIFTING NORTHEAST ACROSS KANSAS AND MISSOURI THIS AFTERNOON...WITH SCATTERED SHOWERS AND THUNDERSTORMS INCREASING IN COVERAGE INTO WESTERN PORTIONS OF THE FORECAST AREA. PLENTY OF MOISTURE AVAILABLE...WITH SURFACE DEWPOINTS SURGING INTO THE UPPER 60S AND LOWER 70S. MODELS IN GOOD AGREEMENT IN TAKING THIS FIRST WAVE NORTHEAST INTO THE GREAT LAKES REGION TONIGHT...DAMPING AND WEAKENING IT IN THE PROCESS AS IT RIDES INTO THE RIDGE OVER THE EASTERN PORTION OF THE NATION. SOMEWHAT OF A LULL IN THE ACTION FRIDAY IN THE WAKE OF THIS FIRST SYSTEM...ALHTOUGH WILL KEEP CHANCE POPS IN FOR SCATTERED PRECIP POSSIBLE IN MOIST AIRMASS AND POSSIBLE SMALL RIPPLES IN UPPER FLOW. BETTER CHANCE FOR PRECIPITATION RETURN SATURDAY...AS NEXT SIGNIFICANT SHORT WAVE ROUNDS THE BASE OF THE TROF AND LIFTS TOWARD ILLINOIS. SOME DIFFERENCES IN TIMING BETWEEN MODELS WITH THIS ONE...WITH AVN ABOUT 6 HOURS FASTER THAN THE SLOWER ETA. AT THIS DISTANCE WILL GO WITH A BLEND...AND GO WITH LIKELY POPS SATURDAY. WILL KEEP CHANCE FOR SATURDAY NIGHT...AS ETA HOLDS ON TO POST FRONTAL PRECIP IN VICINITY OF LOW LEVEL BAROCLINIC ZONE AND RIGHT ENTRANCE TO UPPER JET MAX WHILE AVN ATTEMPTS TO BRING IN DRY SLOT. MAIN UPPER TROF MOVES ACROSS SUNDAY...AND ALTHOUGH SURFACE FRONT AND MOIST AXIS PASSES TO THE EAST...WILL HANG ON TO CHANCE POPS FOR SHOWERS ON SUNDAY AS VORT PASSES OVERHEAD. SURFACE HIGH THEN BUILDS IN EARLY NEXT WEEK...WITH MRF INDICATING FLOW TO BECOME A BIT FLATTER BEHIND EXITING TROF. WARM ADVECTION PRECIP RETURNS TO NORTHERN PLAINS AND UPPER MIDWEST ON BACK SIDE OF HIGH BY MID WEEK...BUT LOOKS TO STAY NORTH AND WEST OF FORECAST AREA INTO THURSDAY. TEMPERATURE GUIDANCE PRETTY CLOSE BETWEEN FWC/FAN AND APPEARS REASONABLE. WILL GO WITH HIGHER MINS WITH DEWPOINTS NEAR 70 NEXT TWO NIGHTS. BIG DIFFERENCES SHOW UP BY 120 HOURS BETWEEN AVN AND MRF HOWEVER...WITH 850 TEMPS OF +10 AND +4 RESPECTIVELY BY 12Z MONDAY. CURRENT FORECAST TRENDS COOLER BUT A LITTLE ABOVE MRF MEX GUIDANCE. THIS IN LINE WITH NCEP MANUAL NUMBERS AND WILL CONTINUE. .CHI...NONE RATZER
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 071100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1200 PM CDT/EST THU SEP 6 2001 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA... NO SEVERE WEATHER THIS AFTERNOON OR TONIGHT. A WARM FRONT WILL MOVE INTO NORTHERN ILLINOIS AND NORTHWEST INDIANA BY THIS EVENING...BRINGING MORE HUMID AIR INTO THE REGION. AN UPPER LEVEL DISTURBANCE WILL GENERATE SHOWERS AND THUNDERSTORMS AS IT MOVES NORTHEAST INTO THE THE MIDDLE MISSISSIPPI VALLEY THIS AFTERNOON AND TONIGHT. HOWEVER...ANY THUNDERSTORMS THAT DO DEVELOP ARE NOT EXPECTED TO BECOME SEVERE. RATZER
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
1.25 inches of rain fell in 30 minutes and caused some street flooding and minor flooding in a few basements.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2001Every state in 2001This day in weather historyWarnings in Illinois, September 2001
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: 5267519.