Scattered thunderstorms developed ahead of a cold front moving south from Minnesota and Wisconsin. One storm became pulse severe over Jo Daviess County Illinois between Elizabeth and Hanover.
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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.
Scattered thunderstorms developed ahead of a cold front moving south from Minnesota and Wisconsin. One storm became pulse severe over Jo Daviess County Illinois between Elizabeth and Hanover. Damaging winds brought down several 12 inch diameter limbs on the Offenheiser Farm 1 mile south southwest of Derinda Center. Several other farmers reported hearing hail during the storm but did not look to see how big.
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 Jul 24, 2:30 PM CST, 7 hours 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 330 PM CDT SUN JUL 24 2005 .SYNOPSIS...VERY HOT AND HUMID CONDITIONS AGAIN THIS AFTERNOON ACROSS FORECAST AREA WITH 100 EXCEEDED MAINLY ALONG I-80 CORRIDOR SO FAR WITH WIDESPREAD 90S. OF NOTE...MLI REACHED 100 FOR FIRST TIME IN 10 YEARS. AT SURFACE...MSAS DEPICTS PRESSURE FRONT ROUGHLY ALONG LINE ACROSS IA FROM KPDC THROUGH KALO TO KOMA. MAIN SYNOPTIC FRONT EVIDENT BY CLOUD FIELDS MUCH FURTHER NORTH ACROSS NORTHERN IA TO NORTHEAST NEB. PAST SEVERAL HOURS...LOW LEVEL MOISTURE POOLING HAS BEEN INCREASING ALONG THE SOUTHERN BOUNDARY. YET ANOTHER FEATURE OF CONCERN IS MID AND HIGH LEVEL CLOUD FIELD AND INSTABILITY AXIS LIKELY ASSOCIATED WITH ELEVATED THETA E RIDGE FROM NEAR FREEPORT TO SOUTH OF KANSAS CITY. AS SOME OF THIS MIXES OUT AND SURFACE APPROACHES CONVECTIVE TEMPERATURES...THIS AREA STARTING TO LIGHT UP WITH A FEW CU AT MID AFTERNOON. && .SHORT TERM...(TONIGHT THROUGH MONDAY)...CONCERNS CENTER AROUND CONTINUED HIGH HEAT AND HUMIDITY AND ALSO THUNDERSTORM CHANCES WITH ABUNDANT LOW LEVEL MOISTURE AND FRONTS OVER AREA. FIRST...LOOKING AT THERMAL CONDITIONS...HEAT ADVISORY WILL BE CONTINUED TONIGHT AS MOISTURE POOLING KEEPS HIGH DEWPOINTS OVER NORTHERN HALF OF CWA. SOUTH OF INTERSTATE 80...SOME DRYING OCCURRED THIS MORNING AND UPSTREAM DEWPOINTS IN N CENTRAL MO ARE IN UPPER 60S. HOWEVER... DEEPER MIXING AS DAY PROGRESSES SEEMS TO BE MIXING DOWN HIGHER DEWPOINTS. MUCH LIKE LAST NIGHT...THIS AREA SHOULD LINGER IN MID 70S OVERNIGHT. FURTHER NORTH...TEMPERATURES HAVE NOT CLIMBED AS HIGH AS EXPECTED ALONG HIGHWAY 20 CORRIDOR NORTH OF THE CENTRAL IA BOUNDARY...BUT COMPENSATION OF HIGHER DEWPOINTS THERE SHOULD KEEP LOWS IN MID 70S AS WELL. HEAT INDICES MAY DROP BELOW CRITERIA BRIEFLY IN NORTH LATE TONIGHT...BUT NOT CONFIDENT ENOUGH TO BACK OFF CURRENT ADVISORY. ON MONDAY...THE BOUNDARY WILL LINGER OVER THE NORTHERN PORTION OF THE CWA WITH SIMILAR AIRMASS TO TODAY ACROSS THE SOUTH. WILL THUS EXTEND THE CURRENT ADVISORY THROUGH MONDAY AFTERNOON FOR AREAS SOUTH OF INTERSTATE 80. THE NORTH WILL BE MORE COMPLEX WITH POTENTIAL FOR THUNDERSTORMS AND CLOUD COVER TO HOLD TEMPERATURES DOWN AND WILL LEAVE OUT. LOOKING AT THUNDERSTORM CHANCES...SHORTWAVE MOVING ACROSS DAKOTAS SHOULD INTERACT WITH THE NEARLY STATIONARY BOUNDARY TO PRODUCE AN MCS SOMEWHERE IN SD/NE/MN/IA AREA THIS EVENING WHICH MODELS KEEP NEARLY STATIONARY. FURTHER EAST ALONG THE WEAK BOUNDARIES...CAP HAS SO FAR KEPT CONVECTION IN CHECK. BEST CHANCES FOR PRECIPITATION LOOK TO BE REMNANTS OF MCS MOVING ALONG BOUNDARY IN NORTH WHERE DECENT H85 CONVERGENCE DEPICTED AND WILL HAVE SLIGHT CHANCES THERE OVERNIGHT. ON MONDAY...LIKE GFS HANDLE OF MAIN SYNOPTIC FRONT HOLDING TO THE NORTH...OVER THE MORE SOUTHERLY POSITION ACROSS CENTRAL CWA SHOWN BY NAM. HOWEVER...WITH THE PROXIMITY OF THE BOUNDARY AND WEAKER H7 CAP THAN TODAY...WENT WITH LOW CHANCE POPS ACROSS THE NORTH. ..SHEETS.. .LONG TERM...(MONDAY NIGHT THROUGH SUNDAY) THE MAIN COLD FRONTAL PASSAGE FROM NORTH TO SOUTH SHOULD OCCUR FROM MONDAY NIGHT AROUND MIDNIGHT...TO AROUND 9 AM TUESDAY IN THE FAR SOUTH. MODELS ARE NO LONGER SUGGESTING THAT THE FRONT WILL BE FAR ENOUGH NORTH TO PROVIDE A SECONDARY WAVE OF CONVECTION TUESDAY NIGHT...AS THIS IS NOW PROJECTED FOR CENTRAL MISSOURI AND SOUTHERN ILLINOIS. UNFORTUNATELY FOR THOSE IN EXTREME DROUGHT IN FAR EASTERN IOWA AND NORTHWEST ILLINOIS...THE FRONT LOOKS TO CROSS THROUGH IN THE EARLY MORNING HOURS. THIS SAME SCENARIO HAS LIMITED MOST OF THE BENEFICIAL RAIN EVENTS IN THOSE AREAS THIS WARM SEASON. THAT SAID...THE NORTHWEST LOOKS TO SEE THE POTENTIAL FOR SEVERAL INCHES OF RAIN...POSSIBLY UP TO 4 AS A STRONG MCS SLOWLY MOVES SOUTH MONDAY EVENING. GROUND CONDITIONS SHOULD ALLOW FOR ABSORPTION OF ALL BE THE MOST INTENSE OF RAINFALL RATES. SEVERE WEATHER IN THE FORM OF DAMAGING WINDS APPEARS TO BE THE MAIN SEVERE THREAT...WITH SOME HAIL POTENTIAL DURING THE EVENING AS WELL. TUESDAY NIGHT THROUGH THURSDAY...HIGH PRESSURE LOOKS TO HOLD ACROSS THE CWA...WITH TEMPS IN THE UPPER 70S TO LOWER 80S AND LOWER HUMIDITY. ALL IN ALL...IT SHOULD BE A SPECTACULAR FEW DAYS OF WEATHER...THOUGH IM SURE MANY WOULD TRADE IT FOR SEVERAL RAINY DAYS INSTEAD. THE UPPER FLOW WILL GRADUALLY SHIFT TO A CENTRAL PLAINS/EASTERN ROCKIES RIDGE AGAIN BY THE END OF THE WEEK. THIS WILL ALLOW FOR TEMPS TO RETURN TO ABOVE NORMAL LEVELS IN THE UPPER 80S TO LOWER 90S. WITH THE RIDGE AXIS TO THE WEST...THERE WILL BE A SMALL PROBABILITY OF MCS ACTIVITY SPILLING OVER THE RIDGE INTO THE CWA...SIMILAR TO LAST WEEK. ..ERVIN.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...HEAT ADVISORY FOR EASTERN IOWA SOUTH OF HIGHWAY 30 THROUGH 6 PM MONDAY. NORTH OF HIGHWAY 30...HEAT ADVISORY UNTIL 6 AM MONDAY. IL...HEAT ADVISORY FOR NORTHWEST AND WEST CENTRAL ILLINOIS UNTIL 6 AM MONDAY FOR AREAS NORTH OF HIGHWAY 30. SOUTH OF HIGHWAY 30...HEAT ADVISORY UNTIL 6 PM MONDAY. MO...HEAT ADVISORY FOR SCOTLAND AND CLARK COUNTIES UNTIL 6 PM MONDAY. && SHEETS/ERVIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 548 AM CDT SUN JUL 24 2005 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-251049- 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- 548 AM CDT SUN JUL 24 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL IOWA...SOUTHEAST IOWA...NORTHWEST ILLINOIS...NORTHEAST MISSOURI... NORTHEAST IOWA...WEST CENTRAL ILLINOIS AND NORTH CENTRAL ILLINOIS. .DAY ONE...TODAY AND TONIGHT A HEAT ADVISORY IS IN EFFECT TODAY AND TONIGHT FOR ALL OF EASTERN IOWA...NORTHWEST AND WEST CENTRAL ILLINOIS...AND FAR NORTHEAST MISSOURI. VERY HOT TEMPERATURES COMBINED WITH HIGH HUMIDITY WILL RESULT IN DANGEROUS AFTERNOON HEAT INDICES RANGING FROM 105 TO 115 DEGREES. EVEN THROUGH MUCH OF THE EVENING...HEAT INDICES WILL REMAIN NEAR 100 DEGREES BEFORE ONLY COOLING INTO THE 80S OVERNIGHT. A COLD FRONT IS EXPECTED TO APPROACH THE AREA LATE THIS AFTERNOON BEFORE STALLING IN THE VICINITY OF NORTHEAST IOWA AND NORTHWEST ILLINOIS TONIGHT. WITH COPIOUS AMOUNTS OF MOISTURE AND INSTABILITY IN PLACE AHEAD OF THE FRONT...THERE IS SOME POTENTIAL FOR THUNDERSTORM DEVELOPMENT ALONG THE FRONT OVER NORTHEAST IOWA AND NORTHWEST ILLINOIS LATE THIS AFTERNOON AND TONIGHT...NORTH OF THE HIGHWAY 30 CORRIDOR. HOWEVER...THERE ARE SEVERAL LIMITING FACTORS FOR THUNDERSTORM DEVELOPMENT AND THEY INCLUDE...WEAK FRONTAL CONVERGENCE...THE LACK OF MID AND UPPER LEVEL FORCING...AND THE PRESENCE OF WARM TEMPERATURES ALOFT ACTING AS A LID KEEPING THE AIRMASS CAPPED. SHOULD SOME STORMS DEVELOP THEY WILL HAVE THE POTENTIAL TO BECOME SEVERE. THE MAIN THREAT WILL BE DAMAGING WINDS WITH LARGE HAIL A SECONDARY THREAT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY HOT AND HUMID CONDITIONS WILL CONTINUE MONDAY AND MONDAY EVENING WITH HEAT INDEX READINGS IN THE 100 TO 105 DEGREE RANGE. ADVISORIES FOR HEAT MAY BE NEEDED ALONG AND SOUTH OF INTERSTATE 80 FOR MONDAY AND MONDAY EVENING. THERE IS ALSO THE POTENTIAL FOR THUNDERSTORMS MONDAY INTO TUESDAY. IF THUNDERSTORMS DEVELOP MONDAY...OR MORE LIKELY MONDAY NIGHT THROUGH TUESDAY...SEVERE STORMS ARE POSSIBLE. THE TIMING AND EXTENT OF THE SEVERE WEATHER IS HIGHLY DEPENDENT ON THE LOCATION OF THE COLD FRONT. EMERGENCY MANAGERS SHOULD LISTEN TO LATER FORECASTS AS THE SEVERE THREAT BECOMES BETTER DEFINED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. SPOTTER ACTIVATION MAY BE NECESSARY MONDAY NIGHT AND TUESDAY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 829 PM CDT SUN JUL 24 2005 IAZ040>042>042>002-250600- BUCHANAN IA-DELAWARE IA-DUBUQUE IA-JO DAVIESS IL- STEPHENSON IL- THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 673 IN EFFECT UNTIL 1 AM CDT FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 2 COUNTIES IN NORTHWEST ILLINOIS JO DAVIESS STEPHENSON IN IOWA THIS WATCH INCLUDES 3 COUNTIES IN NORTHEAST IOWA BUCHANAN DELAWARE DUBUQUE THIS INCLUDES THE CITIES OF...DUBUQUE...FREEPORT...GALENA... INDEPENDENCE AND MANCHESTER.
The Quad Cities radar (KDVN), 77 km away, was scanning. The volume nearest the first event began at 04:12 UTC.
1 thunderstorm wind. Local standard time, as filed.
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, July 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: 5466134.