Hail, Jo Daviess
- When
- October 23, 8:27 PM CST
- Where
- Jo Daviess County, Warren
- Measured
- 1.75 in hail
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.500, -89.983
1.75 inch hail reported by law enforcement.
Hail in Illinois, October 23, 2001
Event Summary for 10/23/01:On the evening of October 23, a warm front extended east from Central Iowa through Northern Illinois. The combination of warm air riding northward over this boundary, vertical wind sheer associated with the warm front, and a potent short wave trough of energy in the upper atmosphere, helped bring strong to severe thunderstorms to parts of Northeast Iowa and Northern…
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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.
What happened
The episode as NWS DVN wrote it up.
Event Summary for 10/23/01:On the evening of October 23, a warm front extended east from Central Iowa through Northern Illinois. The combination of warm air riding northward over this boundary, vertical wind sheer associated with the warm front, and a potent short wave trough of energy in the upper atmosphere, helped bring strong to severe thunderstorms to parts of Northeast Iowa and Northern Illinois. These storms produced severe hail as they moved along the front in this area. At one point, one inch diameter hail covered the ground over a large stretch of Northern Stephenson County in Illinois.
What forecasters said that day
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 Oct 23, 12:45 PM CST, 7 hours 42 minutes earlier.
Area forecast discussion, Oct 23, 12:45 PM CST, 7 hours 42 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 145 PM CDT TUE OCT 23 2001 LINGERING POST-FRONTAL LLVL MOISTURE AND SUBSIDENCE INVERSION COMBINING TO MAKE CLOUD COVER STUBBORN TO LEAVE ACRS MOST OF CWA... BUT VIS LOOP SHOWING CLEARING SPREADING ACRS THE FAR SOUTH AND BREAKS SPREADING ACRS NORTHWEST CWA...AS TEMPORARY SUBSIDENCE REGIME HAVING SOME EFFECT. MAY SEE SOME CLEARING THIS EVENING...BEFORE MORE CLOUDS ARRIVE LATER TONIGHT. HOW DO I GET IFPS TO SAY THAT? MSAS SHOWING PRESSURE FALLS BUILDING OVER SOUTHERN IA...INDICATING BOUNDARY FROM KS...TO SOUTHWEST LOWER MI TO SHIFT NORTH AGAIN. WELL ADVERTISED 140+ KT H3 JET MAX ALREADY TAKING AIM AT SOUTHERN PLAINS TODAY...AND COMPLEX BUT VIGOROUS VORT STRUCTURE SEEN ON CURRENT W/V IMAGERY OVER NORTHWEST PACIFIC INTERMOUNTAIN REGION...QUICKLY TO MAKE HEADWAY EAST-SOUTHEAST. THESE PROCESSES AND INHERENT LOW LEVEL CYCLOGENESIS ALREADY FORMING DEEPENING SFC LOW OVER SD ATTM...WITH SHORT RANGE MODELS SIMILARLY SWEEPING AND CONTINUE DEEPENING SFC LOW EAST...TO WEST CENTRAL WI BY 12Z WED. NICE POT VORT ADVECTION AND TROP FOLD CLOSE TO H4 MBS ACRS WEST IA BY LATE WED MORNING TO AID IN BOMBING OF SFC LOW. ALL IN ALL...JUST PLAIN STRONG COOL SEASON DYNAMIC SET UP TO CARVE LONG WAVE TROUGH ACRS THE CENTRAL CONUS ON WED...WITH CLOSED UPPER VORTEX FORMING OVER MN. BIG EARLY SPRING-LIKE SEVERE EVENT POSSIBLE JUST TO THE EAST AND SOUTHEAST OF DVN CWA ON WED. STRONG COLD PUSH TO EVENTUALLY BE USHERED AROUND IT...DOWN ACRS THE LOCAL AREA WITH SECONDARY COLD PUSH/FRONT WED EVENING. SOUTHWEST 30 KT H85 JET...ALTHOUGH NOT AS FAVORABLE AS A SOUTH- SOUTHEAST FETCH WOULD BE FOR MOISTURE/THTA-E TAP...STILL DOES DECENT JOB ENOUGH TO SUPPORT SQUALL LINE THREAT LATE NIGHT/EARLY WED MORNING AHEAD OF FIRST COLD FRONT...ALTHOUGH CONVECTIVE SYSTEMS TO SOUTH OF REGION AND OTHER LIMITING FACTORS FOR GOOD THTA-E/MOISTURE SUPPORT MAY LIMIT CONVECTIVE FEATURE TO A NARROW AND FAST MOVING LINE(WHICH WOULD BE FAVORABLE WITH SATURATED CWA TO LIMIT FLOODING THREAT.) LIKE AVNS SOLUTION OF SOME RETURN WAA PRECIP BREAKING OUT ACRS THE CWA WITH ADVANCING WEST-TO-EAST ORIENTED WARM FRONT TONIGHT... BEFORE MAIN PRE COLD-FRONTAL CONVECTION ARRIVES...BUT STILL WILL KEEP LATE NIGHT CHANCE GOING. AM TORN BETWEEN 50 CHANCE POPS AND 60 LIKELYS...BUT MAY KEEP THE LATER. POST FRONTAL RAIN TO LAST INTO WED AFTERNOON AFTER MAIN FROPA JUST AFTER 12Z...BUT AGAIN SECONDARY COLD SURGE DOESNT KICK IN UNTIL AROUND 00Z THU OR SO...WHICH MAY MILK OUT MORE SHOWERS ON ITS OWN. H85 TEMPS ARE GENERALLY PROGGED TO CRASH TO -8 C ACRS THE NORTH...TO -5 C SOUTH BY 12Z THU...AND THERE MAY BE WRAP AROUND FLURRIES ACRS FAR NORTHERN CWA LATE WED NIGHT AND THU MORNING. DEEP SFC LOW JUST NORTHEAST OF LK SUPERIOR TO INDUCE TIGHT ENOUGH PRESSURE GRADIENT FAR ENOUGH TO THE SOUTHEAST OF IT TO CREATE BRISK WEST WINDS WED NIGHT AND MUCH OF THU. CONSIDERING CLOUD COVER...WINDS...STEEP CAA... AND POSSIBLE FLURRIES SUPPORT COLDER FAN HIGHS ON THU. SOME AREAS MAY HAVE TROUBLE GETTING OUT OF 30S. EXTENDED(FRI-TUE)...MODELS CONTINUE WEAKER WITH HANDLING OF FRI VORT SYSTEM RIPPLING DOWN ACRS THE AREA IN CYCLONIC FLOW...BUT STILL SHOULD SQUEEZE OUT PRECIP. MRF LLVL THERMAL PARAMETERS STILL SUPPORT ALL SNOW...WHILE EURO JUST ACRS THE NORTHEAST CWA. WILL ADJUST FRI TO MOSTLY CLOUDY...BUT HOLD SNOW CHANCE OFF ONE MORE DAY. HIGHLY AMPLIFIED RIDGE OVER ROCKIES TO USHER SECONDARY COLD SURGE DOWN ACRS AREA FRI NIGHT INTO SAT...WITH SAT HIGHS ONLY IN LOWER 40S. RIDGE TO THE CONTINUE TO PROGRESS EAST AND FLATTEN AS TRANSITION BACK TO MODERATING ZONAL FLOW PATTERN SEEMS TO WANT TO HAPPEN BY EARLY NEXT WEEK. DRY AND MODERATING CONDITIONS SUN THROUGH TUE. .DVN... IA...NONE. IL...NONE. MO...NONE. HLADIK
The radar
The Quad Cities radar (KDVN), 110 km away, was scanning. The volume nearest the first event began at 02:24 UTC.
Event by event
4 hail. Local standard time, as filed.
Hail, Stephenson
- When
- October 23, 8:36 PM CST
- Where
- Stephenson County, Winslow
- Measured
- 0.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 42.500, -89.800
0.75 inch hail reported by emergency manager.
Hail, Stephenson
- When
- October 23, 9:26 PM CST
- Where
- Stephenson County, 2 mi W of Winslow
- Measured
- 1 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 42.500, -89.833
1.00 inch hail reportey by emergency manager.
Hail, Stephenson
- When
- October 23, 9:50 PM CST to 10:17 PM CST
- Where
- Stephenson County, 10 mi NW of Rock City
- Measured
- 1.5 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 42.517, -89.600
1.00 to 1.50 inch hail reported by trained spotter. Hail totally covered ground along Rock Grove Road from Orangeville to the county line at Lake Summerset.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Missouri, October 23, 2001
- Flood and Hail in Wisconsin, October 23 to 24, 2001
- Hail and Damaging Winds in Missouri, October 23, 2001
- High Wind in Nebraska, October 23, 2001
- High Wind in Washington, October 23, 2001
- Flooding in Iowa, October 23, 2001
- High Wind in Washington, October 23, 2001
- High Wind in Washington, October 23, 2001
- High Wind in Washington, October 23, 2001
- High Wind in Oregon, October 23, 2001
- Hail in Missouri, October 23, 2001
- Hail in Illinois, October 23 to 24, 2001
More
Every storm in Illinois in 2001Every state in 2001This day in weather historyWarnings in Illinois, October 2001
Sources
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: 5270216, 5270217, 5270218, 5270219.