Alert archive / Illinois / Flash Flood Warnings in 1996
Flash Flood Warning 13, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Jul 18, 1996, 9:42 AM CDT for DeKalb County, Ogle County, Winnebago County, Illinois. It was in force for 8 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
- Jul 18, 1996, 9:42 AM CDT (14:42 UTC)
- Expired
- Jul 18, 1996, 6:00 PM CDT
- In force
- 8 hr
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties DeKalb County, IL, Ogle County, IL, Winnebago County, IL
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 2.7 hours before the alert went out and 128 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
- 1244 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 270 m²/s²
- 0-3 km storm-relative helicity
- 282 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCHI 181447 FFWCHI ILC037-141-201-031-043-089-093-197-INC099-141-091-089-127-149-182300- BULLETIN - EAS ACTIVATION REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE CHICAGO IL 942 AM CDT (942 AM EST) THU JUL 18 1996 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A FLOOD WARNING EFFECTIVE UNTIL 600 PM CDT (600 PM EST) FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTH CENTRAL ILLINOIS ...DE KALB COUNTY...EASTERN OGLE COUNTY...WINNEBAGO COUNTY IN NORTHEAST ILLINOIS ...SOUTHERN COOK COUNTY...DU PAGE COUNTY...KANE COUNTY ...KENDALL COUNTY...NORTHERN WILL COUNTY IN NORTH CENTRAL INDIANA ...MARSHALL COUNTY...ST. JOSEPH COUNTY IN NORTHWEST INDIANA ...LA PORTE COUNTY...LAKE COUNTY...PORTER COUNTY ...STARKE COUNTY ...A FLOOD WARNING HAS BEEN ISSUED FOR PARTS OF NORTH CENTRAL AND NORTHEAST ILLINOIS...NORTHWEST AND NORTH CENTRAL INDIANA TIL 600 PM... RAINFALL OF 5 TO 10 INCHES OCCURRED FROM WEDNESDAY MORNING THROUGH THURSDAY MORNING IN A BAND FROM NEAR ROCKFORD TO THE SOUTH SIDE OF CHICAGO TO NEAR SOUTH BEND INDIANA. THE HEAVIEST RAIN WAS IN THE SOUTHWEST SUBURBS OF CHICAGO WHERE 12 TO 15 INCHES FELL. NUMEROUS MAJOR ROADS AND HIGHWAYS ARE INUNDATED WITH WATER MAKING TRAVEL HAZARDOUS OR IMPOSSIBLE. WATER ON ROADS WILL GRADUALLY SUBSIDE DURING THE DAY BUT MANY CREEKS AND STREAMS WILL EXPERIENCE MAJOR FLOODING THROUGH THE DAY. AT 940 AM THERE WERE SCATTERED SHOWERS AND THUNDERSTORMS STILL OCCURRING OVER NORTHERN ILLINOIS AND NORTHERN INDIANA BUT THERE HAS BEEN AN OVERALL DECREASE IN COVERAGE AND INTENSITY THROUGH THE MORNING. HOWEVER MORE THUNDERSTORMS ARE EXPECTED LATER TODAY. SOME STORMS MAY PRODUCE ADDITIONAL HEAVY RAIN AND POSSIBLY SEVERE WEATHER AS WELL. THIS IS AN EXTREMELY DANAGEROUS FLOOD SITUATION...IT IS LIKELY THE WORST FLOOD EVENT EVER FOR PARTS OF NORTHERN ILLINOIS AND NORTHERN INDIANA. DO NOT TRAVEL TODAY UNLESS ABSOLUTELY NECESSARY. PEOPLE ALONG CREEKS AND STREAMS SHOULD BE PREPARED TO MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN. DO NOT LET CHILDREN PLAY IN FLOOD WATERS. LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. ALLSOPP
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.
In the hours before
Special weather statement, Jul 18, 5:58 AM CDT, 3 hours 44 minutes before
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-181600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 600 AM CDT THU JUL 18 1996 THIS OUTLOOK PERTAINS TO THE FOLLOWING COUNTIES IN NORTHERN ILLINOIS: BOONE-COOK-DE KALB-DU PAGE-FORD-GRUNDY-IROQUOIS-KANE-KANKAKEE- KENDALL-LA SALLE-LAKE-LEE-LIVINGSTON-MCHENRY-OGLE-WILL-WINNEBAGO- AND LAKE COUNTY IN INDIANA INCLUDING THE CITIES OF AURORA...BELVIDERE...CHICAGO...DE KALB... DIXON...GARY IN...JOLIET...KANKAKEE...MORRIS...OTTAWA...PONTIAC... ROCHELLE...ROCKFORD...WATSEKA...WAUKEGAN...WHEATON...WOODSTOCK THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON AND TONIGHT. A STRONG LOW PRESSURE SYSTEM CENTERED OVER EXTREME NORTHWEST MINNESOTA THIS MORNING WILL MOVE TO NORTHERN MICHIGAN TONIGHT. A TRAILING COLD FRONT WILL EXTEND THIS EVENING FROM THE LOW PRESSURE CENTER /OVER NORTHERN MICHIGAN/ TO CENTRAL IOWA. THUNDERSTORMS ARE FORECAST TO DEVELOP IN WARM AND HUMID AIR AHEAD OF THE ADVANCING COLD FRONT THIS AFTERNOON AND TONIGHT...AND THOSE STORMS MAY BECOME SEVERE. KOENEMAN
Special weather statement, Jul 18, 7:00 AM CDT, 2 hours 42 minutes before
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-181300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 655 AM CDT THU JUL 18 1996 ...STORM TOTAL RAINFALL REPORTS AS OF 650 AM CDT... TORRENTIAL RAINFALL CONTINUED ALL NIGHT ACROSS THE WESTERN AND SOUTHWESTERN SUBURBS. RADAR ESTIMATES INDICATED A LARGE AREA OF SOUTHERN KANE COUNTY RECEIVED OVER 12.00 INCHES OF RAIN SINCE YESTERDAY. HARDEST HIT WAS THE AURORA AREA. RAINFALL REPORTS FROM OBSERVERS: LOCATION ENDING TIME AMOUNT REMARKS AURORA 530 AM 14.5 IN RAIN GAUGE OVERFLOWED JOLIET 635 AM 11.23 ELBURN 530 AM 11.00 W NAPERVILLE 510 AM 9.87 JOLIET 620 AM 8.95 MIDWAY 650 AM 7.69 ALL TIME 24 HR RECORD THESE TOTALS AND ADDITIONAL REPORTS WILL BE UPDATED AS FURTHER REPORTS ARE RECEIVED. HALLER
Special weather statement, Jul 18, 8:21 AM CDT, 1 hour 21 minutes before
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-181400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 815 AM CDT THU JUL 18 1996 ...STORM TOTAL RAINFALL REPORTS AS OF 800 AM CDT... LOCATION ENDING TIME AMOUNT REMARKS W NAPERVILL 510 AM 9.87 IN ELBURN 530 AM 11.00 AURORA 530 AM 14.50 RAIN GAUGE OVERFLOWED MIDWAY 650 AM 7.69 ALL TIME 24 HR RECORD JOLIET 700 AM 11.23 JOLIET 700 AM 9.30 JOLIET 710 AM 8.95 DARIEN 720 AM 7.02 JOLIET 720 AM 8.71 JOLIET 720 AM 10.25 ROMEOVILLE 800 AM 10.38 NWS OFFICE THESE TOTALS A6ND ADDITIONAL REPORTS WILL BE UPDATED AS FURTHER REPORTS ARE RECEIVED. HALLER
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 9:07 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 53 min |
| Jul 17, 11:10 PM CDT | Flash Flood Warning | LOT | Winnebago | 3 hr |
| Jul 18, 1:42 AM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 2 hr |
| Jul 18, 4:02 AM CDT | Flash Flood Warning | LOT | Cook, Will | 3 hr |
| Jul 18, 4:02 AM CDT | Flash Flood Warning | LOT | DeKalb, Kane, Kendall | 3 hr |
| Jul 18, 4:02 AM CDT | Flash Flood Warning | LOT | DuPage | 3 hr |
| Jul 18, 9:42 AM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 8 hr |
| Jul 18, 6:00 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 6 hr |
Nearby
Flash Flood Warnings in Illinois, 1996Every flash flood warning in 1996
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.