Hail and Damaging Winds in Illinois, July 17, 2006

Name: Hail and Damaging Winds in Illinois, July 17, 2006
Start: 2006-07-17T19:30
End: 2006-07-17T20:21
Location: Illinois

July 17, 2006 · NWS DVN · 13 events in 3 counties and zones

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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $22,000
Crop damage: $33,000
Events: 13

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.

An upper level disturbance initiated two supercell thunderstorms in a moist to near tropical atmosphere that was ahead of a cold front in eastern Iowa. Outflow from the supercells developed a broken line of of storms that moved through Iowa and into Illinois and Missouri. The line produced sporatic pulse severe storms from east central Iowa into northwest Illinois. The more solid part of the line produced a considerable amount of severe weather from east central Iowa into northern Missouri.

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 Jul 17, 2:10 PM CST, 5 hours 20 minutes earlier.

Area forecast discussion, Jul 17, 2:10 PM CST, 5 hours 20 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
310 PM CDT MON JUL 17 2006

.SYNOPSIS...
A COLD FRONT WILL SLOWLY MOVE THROUGH THE REGION TONIGHT BEFORE
STALLING OUT ACROSS MISSOURI AND CENTRAL ILLINOIS. THE PASSAGE OF
THE FRONT SHOULD BRING IN LESS HUMID AND COOLER CONDITIONS.

&&

.DISCUSSION...
CAP STILL HOLDING ACROSS THE AREA AND THE MAIN QUESTION IS WILL IT
BE BROKEN. CHANCES LOOK BETTER TO THE EAST OF THE CWFA BUT GIVEN THE
EXTREME HEAT/INSTABILITY...CAN NOT RULE IT OUT HAPPENING OVER US.
THEREFORE WILL TAKE A WAIT AND SEE APPROACH. COLD FRONT SHOULD STALL
OUT/WASH OUT ACROSS NORTHERN MISSOURI/CENTRAL ILLINOIS BY TUESDAY
MORNING. AS FOR THE CURRENT HEAT ADVISORY...WILL LET IT EXPIRE AT
00Z. WE MAY STILL SEE HEAT INDICES OF 80 OR ABOVE ACROSS THE SOUTH
THIRD TONIGHT BUT HEAT INDICES SHOULD REMAIN BELOW 105 ON TUESDAY.

MODELS ARE ALL OVER THE PLACE REGARDING HOW MUCH THE UPPER RIDGE
WILL BREAK DOWN. IT WOULD APPEAR THAT A RESPECTABLE MCS SHOULD FIRE
TUESDAY EVENING IN THE PLAINS AND MOVE GENERALLY EAST...BRUSHING THE
NORTHERN THIRD OR SO OF THE CWFA WEDNESDAY MORNING. ANOTHER MCS
EVENT MAY BE SEEN LATE WEDNESDAY NIGHT/THURSDAY MORNING ACROSS THE
NORTHERN THIRD. THIS SECOND MCS EVENT IS LESS CERTAIN.

FRIDAY ON...DID NOT REALLY MAKE ANY CHANGES. GLOBAL MODELS ARE
VACILLATING WITH EACH RUN REGARDING A DEVELOPING LONGWAVE TROF OVER
THE EASTERN CONUS. ONE THING THAT IS CERTAIN IS THAT NORTHWEST FLOW
WILL DEVELOP ALLOWING COOLER TEMPERATURES TO PUSH INTO THE AREA.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...HEAT ADVISORY TODAY MAINLY ALONG AND SOUTH OF ROUTE 30.
IL...HEAT ADVISORY TODAY.
MO...HEAT ADVISORY TODAY.

08

Hazardous weather outlook, Jul 17, 11:30 AM CST, 8 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1230 PM CDT MON JUL 17 2006

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-181730-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
1230 PM CDT MON JUL 17 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT

A HEAT ADVISORY IS IN EFFECT FOR AREAS SOUTH OF HIGHWAY 30. HOT
TEMPERATURES CONTINUED THROUGH THE NIGHT LAST NIGHT AND WILL
CONTINUE DURING THE DAY TODAY. AFTERNOON HIGHS IN THE UPPER
90S COMBINED WITH HIGH RELATIVE HUMIDITY WILL PRODUCE HEAT INDEX
READINGS OF 105 TO 110 ACROSS THE AREA.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATER THIS
AFTERNOON AND THIS EVENING ACROSS THE AREA. THE STRONG HEATING OF
THE DAY ALONG WITH THE HIGH HUMIDITY WILL CONTRIBUTE TO VERY
UNSTABLE CONDITIONS. IN ADDITION...AN UPPER-LEVEL WAVE WILL HELP
PROVIDE SUPPORT FOR THUNDERSTORMS AS A SURFACE COLD FRONT WORKS
ACROSS IOWA FROM THE NORTHWEST. THE INSTABILITY...ALONG WITH COLDER AIR
MOVING IN AT MID- LEVELS...IS EXPECTED TO BREAK THE CAP TODAY AND
ALLOW THUNDERSTORMS TO DEVELOP. THUNDERSTORMS WILL INTENSIFY
QUICKLY INTO SUPERCELLS CAPABLE OF PRODUCING UP TO GOLFBALL-
SIZED HAIL... WITH A FEW CELLS CAPABLE OF EVEN LARGER HAIL. AS
THE STORMS MOVE ACROSS THE AREA...CELLS MAY EVOLVE INTO SMALLER
LINES OR BOW ECHOES...AND THE PRIMARY THREAT WILL SHIFT TOWARD
DAMAGING WINDS UP TO 80 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THUNDERSTORMS MAY MOVE INTO THE AREA ON LATE TUESDAY NIGHT INTO
WEDNESDAY MORNING. THE STORMS MAY BE STRONG... AND THERE IS A
SMALL POTENTIAL FOR SEVERE WEATHER.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND THIS
EVENING ACROSS THE AREA.

MAYES

In the hours before

Local storm report, Jul 17, 6:30 PM CST, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
730 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0729 PM     TSTM WND DMG     MARENGO                 41.80N 92.07W
07/17/2006                   IOWA               IA   BROADCAST MEDIA

            DELAYED REPORT. KWWL REPORTS SEVERAL TREES DOWN IN THE
            MARENGO AREA.

&&

Local storm report, Jul 17, 6:40 PM CST, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
740 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     TSTM WND DMG     HILLS                   41.57N 91.54W
07/17/2006                   JOHNSON            IA   AMATEUR RADIO

            POWER OUT.

&&

Local storm report, Jul 17, 6:41 PM CST, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
741 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0735 PM     HAIL             1 S CASCADE             42.28N 91.01W
07/17/2006  M0.25 INCH       JONES              IA   TRAINED SPOTTER

            PEA SIZE HAIL.

&&

JH2

Local storm report, Jul 17, 6:47 PM CST, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
747 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0744 PM     HEAVY RAIN       WASHINGTON              41.30N 91.69W
07/17/2006  M1.00 INCH       WASHINGTON         IA   TRAINED SPOTTER

            ONE INCH OF RAIN 645-740 PM.

&&

JH2

Local storm report, Jul 17, 7:06 PM CST, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
806 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0717 PM     HAIL             MONTICELLO              42.24N 91.19W
07/17/2006  E0.25 INCH       JONES              IA   TRAINED SPOTTER

            DELAYED REPORT. PEA HAIL AND HEAVY RAIN.

&&

Local storm report, Jul 17, 7:28 PM CST, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
828 PM CDT MON JUL 17 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0827 PM     TSTM WND GST     BELLEVUE                42.26N 90.43W
07/17/2006  E40 MPH          JACKSON            IA   TRAINED SPOTTER

            ESTIMATED 40 MPH WITH HEAVY RAIN.

&&

The radar

The Quad Cities radar (KDVN), 76 km away, was scanning. The volume nearest the first event began at 01:28 UTC.

Open the radar archive at this moment

Event by event

12 thunderstorm wind, 1 hail. Local standard time, as filed.

Thunderstorm Wind, Jo Daviess

When: July 17, 7:30 PM CST
Where: Jo Daviess County, 7 mi WNW of Hanover
Measured: 52 kt (60 mph) estimated gust
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 42.283, -90.417

large trees bending over

Hail, Jo Daviess

When: July 17, 7:30 PM CST
Where: Jo Daviess County, 7 mi WNW of Hanover
Measured: 1 in hail
Property damage: $2,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 42.283, -90.417

penny to quarter size hail

Thunderstorm Wind, Jo Daviess

When: July 17, 7:33 PM CST to 7:42 PM CST
Where: Jo Daviess County, Elizabeth
Measured: 57 kt (66 mph) estimated gust
Property damage: $3,000
Crop damage: $7,000
Reported by: OFFICIAL NWS OBS.
Coordinates: 42.317, -90.217

trees and corn down

Thunderstorm Wind, Jo Daviess

When: July 17, 7:34 PM CST to 7:40 PM CST
Where: Jo Daviess County, Hanover
Measured: 57 kt (66 mph) estimated gust
Property damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 42.250, -90.283

Trees down. Estimated 56 to 63 knot (65 to 75 mph) winds

Thunderstorm Wind, Carroll

When: July 17, 7:51 PM CST to 7:55 PM CST
Where: Carroll County, Ms Pallisades Sp
Measured: 52 kt (60 mph) estimated gust
Property damage: $2,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.133, -90.167

tree down on Ridge Rd

Thunderstorm Wind, Stephenson

When: July 17, 7:58 PM CST
Where: Stephenson County, 1 mi SSW of Loran
Measured: 61 kt (70 mph) measured gust
Crop damage: $4,000
Reported by: TRAINED SPOTTER
Coordinates: 42.217, -89.933

measured 70 mph gust on the Jo Daviess/Stephenson line

Thunderstorm Wind, Jo Daviess

When: July 17, 7:58 PM CST
Where: Jo Daviess County, 8 mi ESE of Elmoville
Measured: 61 kt (70 mph) measured gust
Crop damage: $4,000
Reported by: TRAINED SPOTTER
Coordinates: 42.233, -89.917

measured 70 mph gust on the Jo Daviess/Stephenson line

Thunderstorm Wind, Carroll

When: July 17, 7:58 PM CST to 8:01 PM CST
Where: Carroll County, 7 mi N of Mt Carroll
Measured: 52 kt (60 mph) estimated gust
Property damage: $1,000
Crop damage: $3,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.200, -89.983

tree down on highway 78 on the Jo Daviess/Carroll line

Thunderstorm Wind, Jo Daviess

When: July 17, 7:58 PM CST to 8:01 PM CST
Where: Jo Daviess County, 5 mi SSE of Elmoville
Measured: 52 kt (60 mph) estimated gust
Property damage: $1,000
Crop damage: $3,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.200, -90.017

tree down on highway 78 on the Jo Daviess/Carroll line

Thunderstorm Wind, Carroll

When: July 17, 8:10 PM CST to 8:13 PM CST
Where: Carroll County, 3 mi S of Shannon
Measured: 52 kt (60 mph) estimated gust
Property damage: $2,000
Crop damage: $2,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.117, -89.733

tree down at the jct of Shannon & Locust Rds

Thunderstorm Wind, Carroll

When: July 17, 8:13 PM CST
Where: Carroll County, Lanark
Measured: 57 kt (66 mph) estimated gust
Property damage: $3,000
Reported by: AMATEUR RADIO
Coordinates: 42.100, -89.833

trees down blocking the road

Thunderstorm Wind, Stephenson

When: July 17, 8:15 PM CST
Where: Stephenson County, Freeport
Measured: 57 kt (66 mph) estimated gust
Property damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 42.283, -89.617

6 to 8 inch diameter braches down on some roads in the southwest part of the city. Some partially rotted whole trees also down.

Thunderstorm Wind, Stephenson

When: July 17, 8:21 PM CST
Where: Stephenson County, 1 mi SSW of Bolton
Measured: 61 kt (70 mph) measured gust
Crop damage: $4,000
Reported by: EMERGENCY MANAGER
Coordinates: 42.233, -89.733

measured 70 mph gust at the jct of Bolton & Prairie Rds

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
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

Every storm in Illinois in 2006 Every state in 2006 This day in weather history Warnings in Illinois, July 2006

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: 5526391, 5526392, 5526393, 5526394, 5526395, 5526396, 5526397, 5526398, 5526399, 5526486, 5526485, 5526488, 5526487.