1 tornado, as filed by the National Weather Service.
Every event with a place to put it. 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 Aug 25, 1:05 PM CST, 3 hours 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 205 PM CDT SAT AUG 25 2001 FIRST MAIN WAVE OF PCPN HAS SWUNG THRU AND NOW IS IN INDIANA. DRY SLOTTING HAS OPENED UP MOST OF IL TO SUNSHINE WHERE UNSTABLE MOIST FIELD OPEN TO DIURNAL HEATING. TRIGGER TEMP FROM SOUNDING IN THE MIDDLE 80S SO DIURNALLY INDUCED STRONG CONVECTION NOT LIKELY IN NRN IL/NWRN IN. MOISTURE CONV ZONES HIGHLITE IN 2 AREAS...ONE ALONG BUILDING TSTMS IN SERN IL AND ALONG FRONTAL BOUNDARY EXTENDING THRU MO FROM SFC LO IN NERN IA. LOW LVL MOISTURE FEED FROM GULF TERMINATES IN SRN IL/SWRN IN WHERE BLOWUP IS GOING ON. CENTRAL IL TRAJECTORY BEING WRAPPED AROUND UPPER LOW AND CUT OFF FROM MAIN MSTR SOURCE. THUS MAIN PCPN EVENT MAY BE OVER FOR THE AREA. WILL PROBLY GO CATEGORICAL WITH PERIODS OF SHOWERS OR THUNDERSTORMS AND NO MORE MENTION OF HEAVY RAIN POTENTIAL TONIGHT. SO CHALLENGE THEN WOULD BE ON TIMING OF PCPN ENDING. AVN TAKES SFC LO FASTER AND FURTHER NE THAN ETA. NCEP PREFERS TREND OF ETA OVER AVN AND WILL PROBLY FOLLOW ALONG THOSE LINES. FROPA OCCURS BFR MIDNIGHT IN NCNTRL IL TO NWRN IN BY 12Z SUNDAY. WILL LV CHC LINGERING SHWRS SUNDAY MRNG FOR IN AND NEAR NWRN IN. WHILE STILL REMAINING IN CYCLONIC FLOW SUNDAY...SHOULD BE SLOW TO CLEAR BUT CAA NOT STRONG SO INSTABILITY SHWRS NO LONGER LOOKS VIABLE. IN FACT WEAK RIDGE SLIDES SE THRU AREA SUNDAY AND ANOTHER S/W DROPS OUT OF NRN PLAINS ON MONDAY. WAA CLDNESS WITH WEAK PCPN CHANCE POSSIBLE ON MONDAY AHEAD OF THIS WAVE. WILL GO FOR PTCLDY TO MOCLDY FOR NOW AND NOT PUT IN CHC OF RAIN MONDAY ATTM. BIG HIGH BUILDING OVER LAKES REGION TUESDAY WITH SUNNY SKIES LIKELY AND INCRSG CLDNESS WED WITH CHC RAIN AGAIN THURSDAY AS FROPA DROPS DOWN FROM THE UPR MS VLY. TURNING COOLER AND DRIER FOR FRIDAY AND SATURDAY AS ANOTHER BIG HIGH MOVES INTO THE LAKES AGAIN. .CHI...NONE. BRUMER
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 261100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL NOON PM CDT/EST SAT AUG 25 2001 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA. NO SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON OR TONIGHT. WAVES OF SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS THE AREA AND THREATEN NORTHERN ILLINOIS AND NORTHWEST INDIANA WITH LOCALIZED FLOODING FROM FREQUENT HEAVY STORMS. THIS THREAT WILL CONTINUE THROUGH THIS EVENING FOR NORTH CENTRAL ILLINOIS...DIMINISHING TOWARD MORNING FOR NORTHWEST INDIANA. BRUMER
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
403 PM CDT SAT AUG 25 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0259 PM NAPERVILLE IL TORNADO
08/25/01 DUPAGE REPORTED BY LAW
ENFORCEMENT. BRIEF
TOUCHDOWN WITH NO
DAMAGE REPORTED.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO, IL
542 PM CDT SAT AUG 25 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0531 PM MERRILVILLE INDIANA TORNADO
08/25/01 LAKE TOUCHDOWN AT 73RD AND
COLORADO. REPORTED BY LAW
ENFORCEMENTThe national radar mosaic for the moment the first event began.
1 tornado. Local standard time, as filed.
A small weak tornado touched down briefly on the north side of Wheeler. A few tree limbs were blown down and corn was flattened.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2001Every state in 2001This day in weather historyThe tornado archive for Indiana, 2001Warnings in Indiana, August 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: 5264264.