An upper air disturbance combined with outflow from a decaying MCS and a strong low level jet to initiate a line of severe thunderstorms across Northern Illinois in a nearly moist atmosphere.
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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 episode as NWS DVN wrote it up.
An upper air disturbance combined with outflow from a decaying MCS and a strong low level jet to initiate a line of severe thunderstorms across Northern Illinois in a nearly moist atmosphere.
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 Quad Cities, IA wrote its last area forecast discussion before the first event at Jun 4, 10:23 AM CST, 48 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1123 AM CDT SAT JUN 4 2005 .UPDATE... WILL UPDATE GOING ZONES MAINLY FOR TEMPS THIS AFTERNOON. MORNING CONVECTION HAS HELD DOWN TEMPS...AND WILL RESULT IN SLIGHTLY LOWER MAXES THIS AFTERNOON THAN ORIGINALLY THOUGHT. AS FOR CHANCES OF SVR THIS AFTERNOON...THE MAIN IMMEDIATE CHANCES WOULD BE IN CONJUNCTION WITH THE VORT LOBE LIFTING EAST-NORTHEAST OUT OF OUR AREA. OTHERWISE...OUR NEXT DECENT CHANCE WILL COME LATER THIS EVENING WHEN THE CONVECTION THAT FIRES OVER THE MO-KS-IA-NE AREA MOVES NORTHEAST INTO OUR AREA. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && JAZ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 501 AM CDT SAT JUN 4 2005 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-051100- BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO- CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL- HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA- JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA- MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL- SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL- WASHINGTON IA-WHITESIDE IL- 501 AM CDT SAT JUN 4 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST...EAST CENTRAL...AND SOUTHEAST IOWA...NORTHWEST...NORTH CENTRAL...AND WEST CENTRAL ILLINOIS...AND NORTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT THIS MORNING...SHOWERS AND SOME THUNDERSTORMS WILL MOVE ACROSS LOCATIONS MAINLY EAST OF THE MISSISSIPPI RIVER TIL MID DAY. NONE OF THE STORMS ARE EXPECTED TO APPROACH OR REACH SEVERE LIMITS. ANY RAIN AMOUNTS WILL BE LIGHT TO MODERATE...GENERALLY LESS THAN A QUARTER OF AN INCH. THIS AFTERNOON AND EVENING...A BROKEN LINE OF THUNDERSTORMS WILL REDEVELOP BY LATE AFTERNOON IN MISSOURI AND WESTERN IOWA AND MOVE ACROSS THE REGION THROUGH LATE EVENING. THE STRONGEST STORMS WILL HAVE THE POTENTIAL OF LARGE HAIL UP TO THE SIZE OF GOLFBALLS AND STRAIGHT LINE WINDS UP TO 70 MPH BETWEEN 5 AND 8 PM. AN ISOLATED BRIEF AND WEAK TORNADO OR TWO MAY ALSO OCCUR. THE HIGHEST RISK OF SEVERE WEATHER WILL BE NORTHWEST OF A STERLING ILLINOIS TO MUSCATINE IOWA TO FAIRFIELD IOWA LINE. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE IS A SLIGHT RISK FOR SEVERE STORMS SUNDAY AFTERNOON INTO EARLY EVENING ACROSS NORTHWEST AND WEST CENTRAL ILLINOIS...AND EAST OF A LINE FROM CASCADE TO FORT MADISON IN EASTERN IOWA. THUNDERSTORMS ARE EXPECTED TO DEVELOP AS A COLD FRONT MOVES INTO A MOIST UNSTABLE AIRMASS OVER THE AREA. THE MAIN THREATS WILL BE LARGE HAIL AND DAMAGING WIND. THUNDERSTORMS WILL BE POSSIBLE TUESDAY NIGHT THROUGH FRIDAY. CONDITIONS MAY BE FAVORABLE FOR SEVERE WEATHER WITH ROUNDS OF THUNDERSTORMS WEDNESDAY NIGHT THROUGH FRIDAY. MORE DETAILED INFORMATION WILL BE AVAILABLE AS THIS TIME PERIOD NEARS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND EVENING. INTERESTED INDIVIDUALS SHOULD MONITOR CONDITIONS FOR POSSIBLE ACTIVATION LATER THIS AFTERNOON. NICHOLS/SHEETS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1138 AM CDT SAT JUN 4 2005 ILZ002-017-042300- BUREAU IL-STEPHENSON IL- THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 389 IN EFFECT UNTIL 6 PM CDT FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 3 COUNTIES IN NORTH CENTRAL ILLINOIS BUREAU PUTNAM IN NORTHWEST ILLINOIS STEPHENSON THIS INCLUDES THE CITIES OF...PRINCETON...FREEPORT AND HENNEPIN.
The Quad Cities radar (KDVN), 112 km away, was scanning. The volume nearest the first event began at 17:11 UTC.
2 thunderstorm wind. Local standard time, as filed.
A few trees down in Hennepin. South of town several 12 to 16 inch diameter trees (mainly rotted) were also downed.
Tree down on a house
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2005Every state in 2005This day in weather historyWarnings in Illinois, June 2005
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: 5462917, 5462918.