Alert archive / Illinois / Flash Flood Warnings in 2007
Flash Flood Warning 15, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Jul 9, 2007, 2:54 PM CDT for McHenry County, Illinois. It was in force for 5 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 9, 2007, 2:54 PM CDT (19:54 UTC)
- Expired
- Jul 9, 2007, 8:00 PM CDT
- In force
- 5 hr
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County McHenry County, IL
The radar
The Milwaukee radar (KMKX), 72 km from the middle of the area, began a volume at 19:57 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 12:00Z, 7.9 hours before the alert went out and 187 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
- 1065 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1222 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- -19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 9, 1:00 PM CDT, 1 hour 54 minutes earlier.
Area forecast discussion, Jul 9, 1:00 PM CDT, 1 hour 54 minutes before
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</html>Hazardous weather outlook, Jul 9, 11:50 AM CDT, 3 hours 4 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1150 AM CDT MON JUL 9 2007 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 092130- 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- 1150 AM CDT MON JUL 9 2007/1250 PM CDT MON JUL 9 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHERN ILLINOIS AND EXTREME NORTHERN INDIANA THIS AFTERNOON AND EVENING. THE RISK AREA IS GENERALLY ALONG AND NORTH OF INTERSTATE 80. SCATTERED STORMS MAY DEVELOP ACROSS NORTHEAST ILLINOIS AND NORTHWEST INDIANA AFTER 2 PM CDT OR 3 PM EDT. A WEAK FRONT WILL MOVE SOUTH TO THE ILLINOIS AND WISCONSIN BORDER. A LAKE BREEZE FROM LAKE MICHIGAN MAY MOVE WEST TOWARDS ROCKFORD. THESE TWO FRONTS MAY PROVIDE ENOUGH LIFT TO INITIATE THE SCATTERED THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS AGAIN TUESDAY AFTERNOON AND EVENING OVER MUCH OF NORTHERN ILLINOIS. A STRONGER COLD FRONT IS FORECAST TO SWEEP ACROSS THE MIDWEST TUESDAY EVENING. WITH STRONGER WIND PROFILES ASSOCIATED WITH THIS SYSTEM...AND WITH AMPLE INSTABILITY IN PLACE AHEAD OF THE FRONT...STORMS ARE EXPECTED TO HAVE MORE COVERAGE AND A GREATER POTENTIAL FOR DEVELOPING DAMAGING WIND GUSTS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-766-092130- WINTHROP HARBOR TO WILMETTE HARBOR IL- WILMETTE HARBOR TO NORTHERLY ISLAND IL- NORTHERLY ISLAND TO CALUMET HARBOR IL- CALUMET HARBOR IL TO GARY IN-GARY INDIANA TO BURNS HARBOR- BURNS HARBOR TO MICHIGAN CITY- LAKE MICHIGAN, WINTHROP HARBOR IL EASTWARD TO THE MID- POINT OF THE LAKE AND SOUTHWARD TO MICHIGAN CITY MI BEYOND 5 NM OFFSHORE- 430 AM CDT MON JUL 9 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... TODAY AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHERN LAKE MICHIGAN THIS AFTERNOON AND EVENING. SCATTERED STORMS MAY DEVELOP ACROSS THE LAKE THIS AFTERNOON AND EVENING. A FEW STORMS MAY BE CAPABLE OF PRODUCING MARGINALLY SEVERE HAIL AND WIND GUSTS IN EXCESS OF 34 KNOTS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS AGAIN TUESDAY AFTERNOON AND EVENING. A COLD FRONT IS FORECAST TO SWEEP ACROSS THE SOUTHERN END OF LAKE MICHIGAN TUESDAY EVENING. THE PRIMARY THREAT FROM THESE STORMS WILL BE DAMAGING WIND GUSTS. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 2:14 PM CDT | Severe Thunderstorm Warning | LOT | McHenry | 61 min |
| Jul 9, 2:34 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 56 min |
| Jul 9, 2:37 PM CDT | Special Marine Warning | LOT | 83 min | |
| Jul 9, 3:19 PM CDT | Severe Thunderstorm Warning | LOT | Kane, McHenry | 56 min |
| Jul 9, 3:38 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 52 min |
| Jul 9, 3:44 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane | 61 min |
| Jul 9, 4:07 PM CDT | Severe Thunderstorm Warning | LOT | Will | 23 min |
| Jul 9, 4:25 PM CDT | Flash Flood Warning | LOT | DeKalb | 4 hr |
| Jul 9, 4:27 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 41 min |
| Jul 9, 4:48 PM CDT | Severe Thunderstorm Warning | LOT | Will | 36 min |
| Jul 9, 4:59 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 46 min |
| Jul 9, 5:38 PM CDT | Flash Flood Warning | LOT | Lee | 4 hr |
| Jul 9, 5:49 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 29 min |
| Jul 9, 5:56 PM CDT | River Flood Warning | LOT | DeKalb | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 2007Every flash flood warning in 2007
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.