Alert archive / Illinois / Flash Flood Warnings in 2019
Flash Flood Warning 17, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Sep 12, 2019, 2:53 AM CDT for Lake County, McHenry County, Illinois. It was in force for 3 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
- Sep 12, 2019, 2:53 AM CDT (07:53 UTC)
- Expired
- Sep 12, 2019, 5:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lake County, IL, McHenry County, IL
The radar
The Milwaukee radar (KMKX), 77 km from the middle of the area, began a volume at 07:55 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, 7.9 hours before the alert went out and 209 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
- 2078 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 156 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 Sep 12, 1:06 AM CDT, 1 hour 47 minutes earlier.
Area forecast discussion, Sep 12, 1:06 AM CDT, 1 hour 47 minutes before
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</html>Hazardous weather outlook, Sep 11, 3:37 PM CDT, 11 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
337 PM CDT Wed Sep 11 2019
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
122045-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
337 PM CDT Wed Sep 11 2019 /437 PM EDT Wed Sep 11 2019/
This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited hail risk...up to 1 inches in diameter.
Limited damaging wind risk...up to 60 mph.
Limited Flooding Risk.
Limited Excessive heat Risk.
DISCUSSION...
There is a chance of thunderstorms across the entire outlook
area through tonight, but the stronger, more organized storms
should be north of I-80. The most likely timing for stronger
storms will be this evening into early tonight. If storms do
indeed occur, there is a very limited chance of an isolated
severe thunderstorm or two. In addition, any storms that
occur could produce torrential rainfall.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday...
Elevated Severe Thunderstorm Risk.
Limited Flooding Risk.
Limited Excessive Heat Risk.
Saturday and Sunday...
Limited Thunderstorm Risk.
Tuesday...
Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotters are not expected to be needed do to the limited nature
of any severe risk.
GENERAL STORM MOTION OF THE DAY:
Moving toward to the east at 25 to 30 mph.
LMZ740>745-122045-
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 to Burns Harbor IN-
Burns Harbor to Michigan City IN-
337 PM CDT Wed Sep 11 2019
This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.
.DAY ONE...Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Limited hail risk...up to up to 1 inch in diameter.
Limited thunderstorm wind gust risk...up to 50 knots.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday...
Elevated Thunderstorm Risk.
Saturday and Sunday...
Limited Thunderstorm Risk.
Visit us at http://weather.gov/chicago
Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicagoIn the hours before
Special weather statement, Sep 11, 9:23 PM CDT, 5 hours 30 minutes before
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</html>Special weather statement, Sep 11, 10:04 PM CDT, 4 hours 49 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
1004 PM CDT Wed Sep 11 2019
ILZ004>006-011-012-120345-
Lake IL-Kane IL-Boone IL-De Kalb IL-McHenry IL-
1004 PM CDT Wed Sep 11 2019
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LAKE...NORTHEASTERN
DE KALB...NORTHERN KANE...MCHENRY AND SOUTHERN BOONE COUNTIES UNTIL
1045 PM CDT...
At 1004 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Woodstock to near Marengo. Movement was
southeast at 30 mph.
Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Locations impacted include...
Carpentersville, Algonquin, McHenry, Belvidere, Woodstock, Loves
Park, Lake Zurich, Wauconda, Barrington, Island Lake, Marengo, Wonder
Lake, Lake In The Hills, Huntley, Gilberts, Hampshire, Poplar Grove,
Lakewood, Oakwood Hills and Prairie Grove.
This includes... Boone County Fairgrounds, Mchenry County College,
and Mchenry County Fairgrounds.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4219 8806 4215 8820 4215 8824 4214 8824
4205 8858 4228 8894 4233 8894 4244 8844
TIME...MOT...LOC 0304Z 299DEG 25KT 4234 8843 4223 8870
RODRIGUEZLocal storm report, Sep 11, 10:33 PM CDT, 4 hours 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1033 PM CDT WED SEP 11 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1020 PM TSTM WND GST 2 WNW CRYSTAL LAKE 42.25N 88.35W
09/11/2019 E60 MPH MCHENRY IL AMATEUR RADIO
&&Local storm report, Sep 11, 10:46 PM CDT, 4 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1046 PM CDT WED SEP 11 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0931 PM TSTM WND GST 3 E ANTIOCH 42.48N 88.04W
09/11/2019 E60 MPH LAKE IL PUBLIC
&&The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 7:10 PM CDT | Special Marine Warning | LOT | 95 min | |
| Sep 11, 7:46 PM CDT | Special Weather Statement | LOT | Lake | 29 min |
| Sep 11, 9:23 PM CDT | Special Weather Statement | LOT | McHenry | 67 min |
| Sep 11, 9:30 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 49 min |
| Sep 11, 9:45 PM CDT | Special Marine Warning | LOT | 90 min | |
| Sep 11, 10:04 PM CDT | Special Weather Statement | LOT | Boone, McHenry | 41 min |
| Sep 11, 10:21 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane, Lake, McHenry | 33 min |
| Sep 12, 1:00 AM CDT | Areal Flood Advisory | LOT | Lake, McHenry | 4 hr |
| Sep 12, 3:55 AM CDT | Small Craft Advisory | LOT | 47 hr | |
| Sep 12, 3:56 AM CDT | Beach Hazards Statement | LOT | Lake | 29 hr |
| Sep 12, 5:06 AM CDT | River Flood Warning | LOT | Lake | 11 days |
| Sep 12, 5:06 AM CDT | River Flood Warning | LOT | Lake | 12 days |
| Sep 12, 5:07 AM CDT | River Flood Warning | LOT | Kane, McHenry | 16 days |
| Sep 12, 5:43 AM CDT | Areal Flood Warning | LOT | Lake, McHenry | 5 hr |
| Sep 12, 7:47 AM CDT | Marine Dense Fog Advisory | LOT | 5 hr | |
| Sep 12, 9:42 AM CDT | River Flood Warning | LOT | Lake | 11 days |
| Sep 12, 9:42 AM CDT | River Flood Warning | LOT | Cook | 9 days |
| Sep 12, 9:42 AM CDT | River Flood Warning | LOT | Kane, Kendall | 36 days |
| Sep 12, 10:09 AM CDT | River Flood Watch | LOT | Winnebago | 22 hr |
| Sep 12, 10:14 AM CDT | River Flood Advisory | LOT | Winnebago | 36 hr |
| Sep 12, 12:54 PM CDT | Special Weather Statement | LOT | Ogle | 51 min |
| Sep 12, 1:01 PM CDT | Tornado Warning | LOT | Ogle | 44 min |
| Sep 12, 1:41 PM CDT | Tornado Warning | LOT | Ogle | 64 min |
| Sep 12, 2:48 PM CDT | Special Weather Statement | LOT | DeKalb | 27 min |
| Sep 12, 3:06 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee | 54 min |
| Sep 12, 3:33 PM CDT | Tornado Warning | LOT | DeKalb, Kane | 42 min |
| Sep 12, 4:14 PM CDT | Tornado Warning | LOT | DeKalb, Kane, Kendall | 24 min |
| Sep 12, 6:40 PM CDT | Special Weather Statement | LOT | Lake | 50 min |
Nearby
Flash Flood Warnings in Illinois, 2019Every flash flood warning in 2019
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.