Alert archive / Illinois / Flash Flood Warnings in 2007

Flash Flood Warning 11, NWS Chicago, IL

June 18, 2007Boone County, McHenry County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 18, 2007, 10:11 PM CDT for Boone County, McHenry 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: Jun 18, 2007, 10:11 PM CDT (03:11 UTC)
Expired: Jun 19, 2007, 4:00 AM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Whole counties

Counties Boone County, IL, McHenry County, IL

The radar

The Milwaukee radar (KMKX), 72 km from the middle of the area, began a volume at 03:13 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, 3.2 hours before the alert went out and 242 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1037 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1342 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

Open this sounding in Storm Lab

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 Jun 18, 6:45 PM CDT, 3 hours 26 minutes earlier.

Area forecast discussion, Jun 18, 6:45 PM CDT, 3 hours 26 minutes before

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Hazardous weather outlook, Jun 18, 4:00 PM CDT, 6 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
400 PM CDT MON JUN 18 2007

ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011-
019-190930-
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 MON JUN 18 2007

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL
AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA.

.DAY ONE... TONIGHT

THUNDERSTORMS WILL MOVE THROUGH THE AREA OVERNIGHT. MAIN HAZARDS
WILL BE HEAVY RAINS CREATING PONDING OF ROADWAYS AND GUSTS TO 50
MPH OR GREATER. ADDITIONALLY WILL BE THE USUAL HAZARDOUS LIGHTNING
AND
POSSIBLY SOME SMALL HAIL. THERE HAVE BEEN SOME STORMS THIS EVENING
REACHING SEVERE WIND CRITERIA. ISOLATED SEVERE STORMS ARE STILL
POSSIBLE THROUGH THE EVENING.

.DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER REPORTS ARE REQUESTED AND APPRECIATED.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)

LMZ740>745-766-190930-
WINTHROP HARBOR IL TO MICHIGAN CITY IN-
LAKE MICHIGAN-
400 PM CDT MON JUN 18 2007

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS
AND INDIANA WATERS OF LAKE MICHIGAN.

.DAY ONE... TONIGHT

THUNDERSTORMS WILL MOVE OVER LAKE MICHIGAN OVERNIGHT. MAIN HAZARDS
WILL BE GUSTS TO 35 KNOTS OR MORE. ADDITIONALLY WILL BE THE USUAL
HAZARDOUS LIGHTNING AND POSSIBLY SOME SMALL HAIL.

A SMALL CRAFT ADVISORY FOR WAVES TO 3 FEET WILL REMAIN IN EFFECT
INTO THE MORNING HOURS TUESDAY FOR THE ILLINOIS AND INDIANA
NEARSHORE WATERS. WINDS AND WAVES MAY BE MUCH HIGHER IN AND AROUND
THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)

In the hours before

Local storm report, Jun 18, 5:35 PM CDT, 4 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
535 PM CDT MON JUN 18 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0455 PM     TSTM WND GST     CHICAGO                 41.88N 87.63W
06/18/2007  E56.00 MPH       COOK               IL   C-MAN STATION

            HARRISON CRIB

&&

BMORRIS

Local storm report, Jun 18, 5:37 PM CDT, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
537 PM CDT MON JUN 18 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0435 PM     TSTM WND DMG     LAKE FOREST             42.24N 87.86W
06/18/2007                   LAKE               IL   LAW ENFORCEMENT

            TREES DOWN AT HOUSE

&&

BMORRIS

Local storm report, Jun 18, 5:41 PM CDT, 4 hours 30 minutes before

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Local storm report, Jun 18, 5:43 PM CDT, 4 hours 28 minutes before

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Local storm report, Jun 18, 6:18 PM CDT, 3 hours 53 minutes before

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Local storm report, Jun 18, 6:48 PM CDT, 3 hours 23 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 9:49 PM CDT	Flash Flood Warning	LOT	Winnebago	6 hr
Jun 19, 5:20 AM CDT	Flash Flood Warning	LOT	Jasper	6 hr

Nearby

Flash Flood Warnings in Illinois, 2007 Every 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.