Alert archive / Illinois / Flash Flood Warnings in 2014
Flash Flood Warning 20, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Jul 12, 2014, 11:35 PM CDT for Cook County, Will County, Illinois. It was in force for 6 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 12, 2014, 11:35 PM CDT (04:35 UTC)
- Expired
- Jul 13, 2014, 5:30 AM CDT
- In force
- 6 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cook County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 24 km from the middle of the area, began a volume at 04:34 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
Davenport, (KDVN), launched 00:00Z, 4.6 hours before the alert went out and 223 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
- 2609 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 916 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 13.9
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 Jul 12, 9:54 PM CDT, 1 hour 41 minutes earlier.
Area forecast discussion, Jul 12, 9:54 PM CDT, 1 hour 41 minutes before
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</html>Hazardous weather outlook, Jul 12, 3:43 PM CDT, 7 hours 52 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 343 PM CDT SAT JUL 12 2014 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 132045- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 343 PM CDT SAT JUL 12 2014 /443 PM EDT SAT JUL 12 2014/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME COULD PRODUCE: TORRENTIAL DOWNPOURS LEADING TO LOCALIZED FLASH FLOODING. DAMAGING WIND GUSTS IN EXCESS OF 60 MPH. FREQUENT CLOUD TO GROUND LIGHTNING. AREAS AFFECTED AND TIMING: THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING NORTHWEST OF AN AMBOY TO MCHENRY LINE...THEN STEADILY SPREAD SOUTHEAST THROUGH ALL OF NORTHERN ILLINOIS AND NORTHWEST INDIANA TONIGHT. DISCUSSION: WARM AND VERY MOIST AIR WILL CONTINUE TO LIFT NORTH ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA WITH INSTABILITY STEADILY INCREASING INTO THIS EVENING. A FRONTAL BOUNDARY WILL BE A FOCUS FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON OVER WISCONSIN AND IOWA AND THAT LINE OF STORMS WILL SLOWLY SINK SOUTHEAST THROUGH THE WARNING AREA. HEAVY RAIN WILL BE THE MAIN THREAT AND FLASH FLOODING AND LOCALIZED FLOODING WILL BE VERY POSSIBLE. SEVERE WINDS IN EXCESS OF 60 MPH ARE ALSO POSSIBLE ALONG THE LEADING EDGE OF THE STORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THERE WILL BE A SLIGHT CHANCE TO CHANCE FOR THUNDERSTORMS SUNDAY AFTERNOON THROUGH SUNDAY NIGHT. THEN THERE IS ANOTHER CHANCE FOR STORMS MONDAY AFTERNOON MAINLY SOUTH OF DIXON TO CHICAGO. .SPOTTER INFORMATION STATEMENT... SPOTTERS WILL LIKELY BE NEEDED THROUGH TONIGHT AND SPOTTERS ARE ENCOURAGED TO REPORT HEAVY RAINFALL TOTALS. && LMZ740>745-132045- WINTHROP HARBOR TO WILMETTE HARBOR- WILMETTE HARBOR TO NORTHERLY ISLAND- NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY- 343 PM CDT SAT JUL 12 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. A LINE OF THUNDERSTORMS IS EXPECTED TO SINK SOUTH THROUGH THE NEARSHORE WATERS THIS EVENING THROUGH TONIGHT. WIND GUSTS IN EXCESS OF 35 KT WILL BE POSSIBLE WITH THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. CHANCE FOR THUNDERSTORMS SUNDAY NIGHT...AND AGAIN MONDAY AFTERNOON. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-132045- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 343 PM CDT SAT JUL 12 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. A LINE OF THUNDERSTORMS IS EXPECTED TO SINK SOUTH OVER THE SOUTHERN TWO THIRDS OF THE LAKE THIS EVENING THROUGH TONIGHT. WIND GUSTS IN EXCESS OF 35 KT WILL BE POSSIBLE WITH THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. SLIGHT CHANCE FOR THUNDERSTORMS LATE SUNDAY MORNING AND THEN AGAIN SUNDAY AFTERNOON AND NIGHT OVER THE SOUTHERN HALF OF THE LAKE. THEN THERE IS AN ADDITIONAL CHANCE FOR THUNDERSTORMS MONDAY AFTERNOON OVER THE FAR SOUTHERN PORTION OF THE LAKE. JEE VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE) FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT: WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO
In the hours before
Local storm report, Jul 12, 9:46 PM CDT, 1 hour 49 minutes before
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</html>Local storm report, Jul 12, 9:47 PM CDT, 1 hour 48 minutes before
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</html>Local storm report, Jul 12, 10:10 PM CDT, 1 hour 25 minutes before
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</html>Local storm report, Jul 12, 10:25 PM CDT, 1 hour 10 minutes before
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</html>Special weather statement, Jul 12, 10:41 PM CDT, 54 minutes before
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</html>Local storm report, Jul 12, 10:50 PM CDT, 45 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 8:35 PM CDT | Special Weather Statement | LOT | Ogle, Winnebago | 40 min |
| Jul 12, 8:58 PM CDT | River Flood Warning | LOT | Cook | 16 hr |
| Jul 12, 9:01 PM CDT | Special Weather Statement | LOT | Ogle, Winnebago | 29 min |
| Jul 12, 9:11 PM CDT | River Flood Warning | LOT | Will | 28 hr |
| Jul 12, 9:11 PM CDT | River Flood Warning | LOT | LaSalle | 63 hr |
| Jul 12, 9:19 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 56 min |
| Jul 12, 9:32 PM CDT | River Flood Advisory | LOT | Kane, McHenry | 4 days |
| Jul 12, 9:32 PM CDT | River Flood Advisory | LOT | Kane, Kendall | 6 days |
| Jul 12, 9:53 PM CDT | River Flood Warning | LOT | Bureau, LaSalle | 4 days |
| Jul 12, 9:53 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane, Kendall, LaSalle, Lee, Ogle | 52 min |
| Jul 12, 10:03 PM CDT | River Flood Advisory | LOT | LaSalle | 4 days |
| Jul 12, 10:18 PM CDT | Special Marine Warning | LOT | 117 min | |
| Jul 12, 10:26 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 12, 10:38 PM CDT | Areal Flood Advisory | LOT | Boone, DeKalb, Lee, McHenry, Ogle, Winnebago | 4 hr |
| Jul 12, 10:41 PM CDT | Special Weather Statement | LOT | Cook, DuPage, Kane, Lake, McHenry | 49 min |
| Jul 12, 10:59 PM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kane, Kendall, Lake, McHenry and 1 more | 6 hr |
| Jul 13, 1:37 AM CDT | Areal Flood Advisory | LOT | Ford, Livingston | 4 hr |
| Jul 13, 2:15 AM CDT | Special Weather Statement | LOT | Iroquois | 45 min |
| Jul 13, 9:22 AM CDT | River Flood Advisory | LOT | Will | 22 hr |
| Jul 13, 9:22 AM CDT | River Flood Advisory | LOT | Cook | 16 hr |
| Jul 13, 9:22 AM CDT | River Flood Advisory | LOT | LaSalle | 36 hr |
| Jul 13, 10:53 AM CDT | River Flood Advisory | LOT | Grundy | 29 hr |
| Jul 13, 2:54 AM CDT | Special Weather Statement | LOT | Benton | 36 min |
Nearby
Flash Flood Warnings in Illinois, 2014Every flash flood warning in 2014
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.