Alert archive / Illinois / Flash Flood Warnings in 2006
Flash Flood Warning 1, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Apr 17, 2006, 1:25 AM CDT for Cook County, Will County, Illinois; Lake County, Indiana. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 17, 2006, 1:25 AM CDT (06:25 UTC)
- Expired
- Apr 17, 2006, 5:30 AM CDT
- In force
- 4 hr
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
Counties Cook County, IL, Will County, IL, Lake County, IN
The radar
The Chicago radar (KLOT), 35 km from the middle of the area, began a volume at 06:26 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 6.4 hours before the alert went out and 180 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 406 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1558 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -1.2
What forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Apr 17, 12:57 AM CDT, 28 minutes earlier.
Area forecast discussion, Apr 17, 12:57 AM CDT, 28 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 0035 CDT MON APR 17 2006 .DISCUSSION FOR AFTERNOON GRIDS/ZONES... 310 PM CDT SEVERE WX HAS BEEN FOCUS THROUGH THE DAY AS LOW NOW OVER WEST CENTRAL ILLINOIS HAS MOVED EAST SOUTHEAST TODAY. INITIAL THUNDERSTORMS THIS MORNING FORMED NORTH OF EAST-WEST WARM FRONT JUST SOUTH OF FORECAST AREA. THUNDERSTORMS FORMED BANDS AROUND UPPER LOW AND INTENSIFIED RAPIDLY THROUGH THE MORNING. MAIN WX WAS HAIL WITH NUMEROUS REPORTS OF PEA SIZE AND SOME MARBLE SIZE. WATCHES REMAIN IN EFFECT THROUGH THIS EVENING AS STRONG DYNAMICS ASSOCIATED WITH H5 LOW COMBINE WITH UNSTABLE AIRMASS ALONG WARM FRONT. AS LOW PASSES THIS EVENING CHARACTER OF PRECIP SHOULD CHANGE TO RAIN/SHOWERS BEFORE ENDING BEFORE MORNING. SURFACE RIDGE BUILDS BACK ACROSS THE UPPER LAKES FROM THE NORTHEAST MONDAY. NEXT WX ARRIVES TUESDAY NIGHT AS PAC NORTHWEST TROUGH MOVES ACROSS NORTHERN US AND CLOSES OFF. SURFACE LOW DEVELOPS ON NORTHERN PLAINS WITH BROADLY ARCED COLD FRONT WLL OUT AHEAD OF SYSTEM. FROPA SHOULD OCCUR EARLY/MIDDAY WEDNESDAY. SURFACE/UPPER LOW IS SLOW TO FOLLOW. THEY MOVE SOUTHEAST FROM THE DAKOTAS AND ARE SLOW TO MOVE THROUGH THE AREA LEADING TO AN EXTENDED PERIOD OF CHANCE OF RAIN...THROUGH LATE FRIDAY. WEEKEND APPEARS DRY AT THIS TIME. TEMPS WILL BE ABOVE SEASONAL NORMS NEXT TWO DAYS THEN DROP TO AROUND SEASONAL VALUES WITH FROPA WEDNESDAY. A LITTLE DAY TO DAY WARMING OCCURS THROUGH THE WEEKEND. MINS THROUGH PERIOD WILL HOVER AROUND NORMS. RS && .AVIATION... 0040 CDT THE UPPER AIR LOW IS MOVING EAST AND THE CENTER OF THE CIRCULATION IS EXPECTED TO BE OVER THE ILLINOIS INDIANA BORDER BY 09 UTC. THE EASTWARD SPEED WAS DETERMINED FROM WATER VAPOR IMAGERY AND PROFILER DATA. THE NAM AND GFS MODEL SHOW THE LOW BECOMING INCORPORATED IN THE LARGER UPPER AIR VORTEX OFF THE EAST COAST BY THIS AFTERNOON. AN UPPER AIR RIDGE IS EXPECTED TO BUILD OVER ILLINOIS BY THIS EVENING. WE WILL KEEP THE LIGHT RAIN IN THE TAFS UNTIL 08 UTC. THE WIND IS FORECAST TO DROP OFF TO 3 TO 15 KNOTS. THERE MAY BE SOME HAZE AND LIGHT FOG TOWARDS MORNING. THE SKY WILL BE SCATTERED LATE THIS MORNING. SOME CUMULUS MAY DEVELOP THIS AFTERNOON. THE SURFACE LOW WAS JUST NORTH OF TERRA HAUTE INDIANA. THE PRESSURE IS STILL RATHER LOW AND THERE IS A STRONG PRESSURE GRADIENT. WE WILL KEEP THE WIND SPEED UP TO 15 KNOTS WITH GUSTS TO 20 KNOT THROUGH 08 UTC AND 13 KNOTS THROUGH THE REST OF THE MORNING. && .LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...SCA NSH TONITE INTO MON MORN. &&
Hazardous weather outlook, Apr 16, 4:00 PM CDT, 9 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 400 PM CDT SUN APR 16 2006 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-170930- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- 400 PM CDT SUN APR 16 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TONIGHT THERE IS A RISK OF SEVERE THUNDERSTORMS THIS EVENING ACROSS ALL OF NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA. SOME THUNDERSTORMS MAY PRODUCE LARGE HAIL AND DAMAGING WINDS. THUNDERSTORMS SOUTH OF THE ILLINOIS AND KANKAKEE RIVERS MAY ALSO POSSIBLY PRODUCE A TORNADO. THE THREAT OF SEVERE WEATHER EXISTS THROUGH 9PM THIS EVENING. .DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY THERE IS A CHANCE OF THUNDERSTORMS TUESDAY NIGHT AND WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED THROUGH THIS EVENING. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-170930- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 400 PM CDT SUN APR 16 2006 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH EARLY EVENING. THE THUNDERSTORMS MAY PRODUCE STRONG GUSTY WINDS AND LARGE HAIL. A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH MONDAY MORNING FOR THE ILLINOIS AND INDIANA NEARSHORE WATERS. NORTHEAST WINDS 15 TO 25 KNOTS WILL CAUSE WAVES TO BUILD TO 4 TO 6 FEET. .DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) HANDEL
In the hours before
Local storm report, Apr 16, 8:11 PM CDT, 5 hours 14 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
811 PM CDT SUN APR 16 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0709 AM HAIL CHATSWORTH 40.75N 88.29W
04/16/2006 E1.00 INCH LIVINGSTON IL TRAINED SPOTTER
0713 AM HAIL CHATSWORTH 40.75N 88.29W
04/16/2006 E1.00 INCH LIVINGSTON IL PUBLIC
0720 AM HAIL PIPER CITY 40.76N 88.19W
04/16/2006 E1.00 INCH FORD IL TRAINED SPOTTER
1225 PM HAIL STILLMAN VALLEY 42.10N 89.18W
04/16/2006 E1.00 INCH OGLE IL EMERGENCY MNGR
1230 PM HAIL STILLMAN VALLEY 42.10N 89.18W
04/16/2006 E0.88 INCH OGLE IL EMERGENCY MNGR
1235 PM HAIL OSWEGO 41.70N 88.33W
04/16/2006 E0.75 INCH KENDALL IL TRAINED SPOTTER
AT INTERSECTION OF US34 AND US30.
1242 PM HAIL AURORA 41.77N 88.29W
04/16/2006 E1.75 INCH KANE IL LAW ENFORCEMENT
NUMEROUS REPORTS FROM AROUND THE CITY.
0137 PM HAIL LOVES PARK 42.34N 89.01W
04/16/2006 E0.88 INCH WINNEBAGO IL TRAINED SPOTTER
0149 PM HAIL JOLIET 41.53N 88.12W
04/16/2006 E0.75 INCH WILL IL NWS EMPLOYEE
WEST SIDE OF JOLIET - MARBLE TO PENNY SIZE HAIL COVERING
GROUND.
0433 PM FLOOD 4 E STREATOR 41.13N 88.75W
04/16/2006 LA SALLE IL TRAINED SPOTTER
ROUTE 18 CLOSED WITH WATER OVER HIGHWAY.
0442 PM FLOOD BEECHER 41.35N 87.61W
04/16/2006 WILL IL TRAINED SPOTTER
BEECHER RD CLOSED DUE TO FLOODING - OTHER ROADS UNDER
WATER.
0457 PM TORNADO PIPER CITY 40.76N 88.19W
04/16/2006 FORD IL LAW ENFORCEMENT
BRIEF TOUCHDOWN IN PIPER CITY AT US24, EAST OF 1700E.
TOOL SHED KNOCKED OVER. -TIME CORRECTED TO 1657-
0500 PM FLOOD CHATSWORTH 40.75N 88.29W
04/16/2006 LIVINGSTON IL CO-OP OBSERVER
2.70 INCHES RAINFALL IN ONE HOUR - STREET FLOODING
0500 PM FLOOD MARSEILLES 41.33N 88.69W
04/16/2006 LA SALLE IL TRAINED SPOTTER
STREET FLOODING
0541 PM TORNADO 4 S ASHKUM 40.82N 87.95W
04/16/2006 IROQUOIS IL TRAINED SPOTTER
BREIF TOUCHDOWN AT US45 AND DANFORTH RD.
0625 PM TSTM WND DMG UTICA 41.34N 89.01W
04/16/2006 LA SALLE IL EMERGENCY MNGR
UTILITY POLES DOWN AT US6 AND IL178.
&&
BNLocal storm report, Apr 16, 9:22 PM CDT, 4 hours 3 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
922 PM CDT SUN APR 16 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0709 AM HAIL CHATSWORTH 40.75N 88.29W
04/16/2006 E1.00 INCH LIVINGSTON IL TRAINED SPOTTER
0713 AM HAIL CHATSWORTH 40.75N 88.29W
04/16/2006 E1.00 INCH LIVINGSTON IL PUBLIC
0720 AM HAIL PIPER CITY 40.76N 88.19W
04/16/2006 E1.00 INCH FORD IL TRAINED SPOTTER
1225 PM HAIL STILLMAN VALLEY 42.10N 89.18W
04/16/2006 E1.00 INCH OGLE IL EMERGENCY MNGR
1230 PM HAIL STILLMAN VALLEY 42.10N 89.18W
04/16/2006 E0.88 INCH OGLE IL EMERGENCY MNGR
1235 PM HAIL OSWEGO 41.70N 88.33W
04/16/2006 E0.75 INCH KENDALL IL TRAINED SPOTTER
AT INTERSECTION OF US34 AND US30.
1242 PM HAIL AURORA 41.77N 88.29W
04/16/2006 E1.75 INCH KANE IL LAW ENFORCEMENT
NUMEROUS REPORTS FROM AROUND THE CITY.
0137 PM HAIL LOVES PARK 42.34N 89.01W
04/16/2006 E0.88 INCH WINNEBAGO IL TRAINED SPOTTER
0149 PM HAIL JOLIET 41.53N 88.12W
04/16/2006 E0.75 INCH WILL IL NWS EMPLOYEE
WEST SIDE OF JOLIET - MARBLE TO PENNY SIZE HAIL COVERING
GROUND.
0433 PM FLOOD 4 E STREATOR 41.13N 88.75W
04/16/2006 LA SALLE IL TRAINED SPOTTER
ROUTE 18 CLOSED WITH WATER OVER HIGHWAY.
0442 PM FLOOD BEECHER 41.35N 87.61W
04/16/2006 WILL IL TRAINED SPOTTER
BEECHER RD CLOSED DUE TO FLOODING - OTHER ROADS UNDER
WATER.
0457 PM TORNADO PIPER CITY 40.76N 88.19W
04/16/2006 FORD IL LAW ENFORCEMENT
BRIEF TOUCHDOWN IN PIPER CITY AT US24, EAST OF 1700E.
TOOL SHED KNOCKED OVER. -TIME CORRECTED TO 1657-
0500 PM FLOOD MARSEILLES 41.33N 88.69W
04/16/2006 LA SALLE IL TRAINED SPOTTER
STREET FLOODING
0500 PM FLOOD CHATSWORTH 40.75N 88.29W
04/16/2006 LIVINGSTON IL CO-OP OBSERVER
2.70 INCHES RAINFALL IN ONE HOUR - STREET FLOODING
0541 PM TORNADO 4 S ASHKUM 40.82N 87.95W
04/16/2006 IROQUOIS IL TRAINED SPOTTER
BREIF TOUCHDOWN AT US45 AND DANFORTH RD.
0620 PM TORNADO 2 NW MARTINTON 40.94N 87.75W
04/16/2006 IROQUOIS IL TRAINED SPOTTER
WEST OF INTERSECTION OF IL1 AND COUNTY ROAD 2900N.
0625 PM TSTM WND DMG UTICA 41.34N 89.01W
04/16/2006 LA SALLE IL EMERGENCY MNGR
UTILITY POLES DOWN AT US6 AND IL178.
0656 PM TORNADO 3 NW BEAVERVILLE 40.98N 87.70W
04/16/2006 IROQUOIS IL TRAINED SPOTTER
BREIF TOUCHDOWN.
&&
BNNearby
Flash Flood Warnings in Illinois, 2006Flash Flood Warnings in Indiana, 2006Every flash flood warning in 2006
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.