Alert archive / Illinois / Flash Flood Warnings in 2014

Flash Flood Warning 16, NWS Chicago, IL

June 30, 2014Lee County, Ogle County, Winnebago County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 30, 2014, 8:34 PM CDT for Lee County, Ogle County, Winnebago 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
Jun 30, 2014, 8:34 PM CDT (01:34 UTC)
Expired
Jul 1, 2014, 1:30 AM CDT
In force
5 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties Lee County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 109 km from the middle of the area, began a volume at 01:35 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, 1.6 hours before the alert went out and 113 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2014-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2014-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 square meters per square second.19395878Sfc1 km3 kmRMLM
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
157 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
1059 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
552 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.3

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 30, 7:48 PM CDT, 46 minutes earlier.

Area forecast discussion, Jun 30, 7:48 PM CDT, 46 minutes before
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Hazardous weather outlook, Jun 30, 3:28 PM CDT, 5 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
328 PM CDT MON JUN 30 2014

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
012030-
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-
328 PM CDT MON JUN 30 2014 /428 PM EDT MON JUN 30 2014/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SEVERE THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:

  WIND GUSTS IN EXCESS OF 70 MPH.
  ISOLATED GUSTS IN EXCESS OF 90 MPH.
  POSSIBLY A TORNADO.
  HAIL UP TO 2 INCHES IN DIAMETER.
  TORRENTIAL RAINFALL AND LOCALIZED FLOODING.
  FREQUENT CLOUD TO GROUND LIGHTNING.

  AREAS AFFECTED AND TIMING:

  A LINE OF THUNDERSTORMS HAS ALREADY DEVELOPED OVER EAST CENTRAL
  IOWA AND IS EXPECTED TO ARRIVE OVER NORTHERN ILLINOIS AROUND
  530PM CDT AND CONTINUE TO PUSH EAST NEARING NORTHWEST INDIANA
  BY 7 PM CDT. SOME OF THESE STORMS MAY BE SEVERE AND MAY ALSO
  PRODUCE LOCALLY HEAVY RAINFALL THIS EVENING. THUNDERSTORMS
  WILL THEN DIMINISH AND GRADUALLY MOVE EAST OF THE AREA LATER
  THIS EVENING.

  DISCUSSION:

  THE COMBINATION OF STRONG INSTABILITY...STRONG WINDS ALOFT...
  AND THE APPROACHING LOW PRESSURE IS EXPECTED TO RESULT IN
  SEVERE THUNDERSTORMS ARRIVING IN WEST CENTRAL ILLINOIS THIS
  AFTERNOON. THESE STORMS WILL SPREAD EAST INTO NORTHERN ILLINOIS
  AND NORTHWEST INDIANA THROUGH THE EVENING HOURS.
  THE LINE OF STORMS IS EXPECTED TO DEVELOP INTO AN EASTWARD
  MOVING COMPLEX WITH A SIGNIFICANT POTENTIAL FOR DAMAGING WINDS
  ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA THIS EVENING.
  WIND GUSTS IN EXCESS OF 70 MPH...WITH AN ISOLATED GUST IN EXCESS
  OF 90 MPH POSSIBLE.

PORTIONS OF THE KANKAKEE RIVERS WILL REMAIN IN FLOOD. OTHER AREA
STREAMS WILL REMAIN NEAR BANKFULL CONDITIONS...HOWEVER WITH
ADDITIONAL RAINFALL EXPECTED A FEW SITES MAY APPROACH FLOOD STAGE AGAIN.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY.

PORTIONS OF THE KANKAKEE RIVERS WILL REMAIN IN FLOOD. OTHER AREA
STREAMS WILL REMAIN NEAR BANKFULL CONDITIONS...HOWEVER WITH
ADDITIONAL
RAINFALL A FEW SITES MAY APPROACH FLOOD STAGE AGAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON THROUGH THIS EVENING.

&&

LMZ740>745-012030-
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-
328 PM CDT MON JUN 30 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.

THUNDERSTORMS ARE LIKELY THIS EVENING THROUGH TONIGHT...WITH SEVERE
THUNDERSTORMS POSSIBLE DURING THE EVENING. WIND GUSTS IN EXCESS OF
60 KNOTS WILL BE POSSIBLE THIS EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

GUSTY WEST WINDS MAY PRODUCE HAZARDOUS CONDITIONS FOR SMALL
CRAFT ON TUESDAY.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-012030-
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-
328 PM CDT MON JUN 30 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THUNDERSTORMS...SOME OF WHICH MAY BE SEVERE...ARE EXPECTED
OVER MUCH OF THE LAKE LATER THIS AFTERNOON AND TONIGHT.
WIND GUSTS IN EXCESS OF 60 KNOTS WILL BE POSSIBLE.

PATCHY DENSE FOG IS POSSIBLE ACROSS THE NORTHERN HALF OF THE
LAKE THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

PATCHY DENSE FOG MAY LINGER MAINLY ACROSS NORTHERN LAKE
MICHIGAN THROUGH TUESDAY.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY.

&&

BEACHLER

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, Jun 30, 8:23 PM CDT, 11 minutes before
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Local storm report, Jun 30, 8:26 PM CDT, 8 minutes before
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Local storm report, Jun 30, 8:28 PM CDT, 6 minutes before
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Local storm report, Jun 30, 8:29 PM CDT, 5 minutes before
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Local storm report, Jun 30, 8:31 PM CDT, 3 minutes before
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Local storm report, Jun 30, 8:32 PM CDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 7:04 PM CDTSevere Thunderstorm WarningLOTCook, Kankakee, Will56 min
Jun 30, 7:24 PM CDTSpecial Marine WarningLOT96 min
Jun 30, 7:50 PM CDTAreal Flood AdvisoryLOTKankakee, Will3 hr
Jun 30, 8:27 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, Lee, Ogle, Winnebago48 min
Jun 30, 8:50 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, Kane, LaSalle, Lee, McHenry40 min
Jun 30, 9:09 PM CDTSpecial Marine WarningLOT96 min
Jun 30, 9:17 PM CDTAreal Flood AdvisoryLOTBoone, DeKalb, Kane, Kendall, McHenry4 hr
Jun 30, 9:18 PM CDTSevere Thunderstorm WarningLOTGrundy, LaSalle, Livingston57 min
Jun 30, 9:23 PM CDTSmall Craft AdvisoryLOT22 hr
Jun 30, 9:26 PM CDTRiver Flood WarningLOTKane, Kendall61 hr
Jun 30, 9:26 PM CDTRiver Flood WarningLOTLaSalle66 hr
Jun 30, 9:27 PM CDTSevere Thunderstorm WarningLOTCook, DeKalb, DuPage, Kane, Kendall, LaSalle and 1 more78 min
Jun 30, 9:37 PM CDTAreal Flood AdvisoryLOTGrundy, Kankakee, Kendall, LaSalle, Livingston, Will4 hr
Jun 30, 9:39 PM CDTSpecial Marine WarningLOT2 hr
Jun 30, 9:45 PM CDTRiver Flood AdvisoryLOTLake4 days
Jun 30, 9:45 PM CDTRiver Flood AdvisoryLOTCook56 hr
Jun 30, 9:49 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee, Livingston, Will56 min
Jun 30, 9:58 PM CDTTornado WarningLOTCook, Will32 min
Jun 30, 10:12 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston78 min
Jun 30, 10:13 PM CDTRiver Flood WarningLOTBoone45 hr
Jun 30, 10:13 PM CDTRiver Flood WarningLOTWinnebago3 days
Jun 30, 10:13 PM CDTRiver Flood WarningLOTWinnebago5 days
Jun 30, 10:13 PM CDTRiver Flood WarningLOTOgle4 days
Jun 30, 10:13 PM CDTRiver Flood WarningLOTLee3 days
Jun 30, 10:32 PM CDTRiver Flood AdvisoryLOTWinnebago6 days
Jun 30, 10:32 PM CDTRiver Flood AdvisoryLOTWinnebago36 hr
Jun 30, 10:32 PM CDTRiver Flood AdvisoryLOTDeKalb36 hr
Jun 30, 10:32 PM CDTTornado WarningLOTKankakee28 min
Jun 30, 10:42 PM CDTSevere Thunderstorm WarningLOTIroquois, Kankakee18 min
Jun 30, 10:45 PM CDTRiver Flood WarningLOTBureau, LaSalle6 days
Jun 30, 10:52 PM CDTRiver Flood AdvisoryLOTGrundy60 hr
Jun 30, 10:52 PM CDTRiver Flood AdvisoryLOTLaSalle36 hr
Jun 30, 11:19 PM CDTAreal Flood AdvisoryLOTCook, DuPage, Will3 hr
Jul 1, 12:24 AM CDTRiver Flood AdvisoryLOTWill47 hr
Jul 1, 12:33 AM CDTRiver Flood AdvisoryLOTCook36 hr
Jul 1, 1:20 AM CDTAreal Flood WarningLOTCook, DuPage, Lake, Will10 hr
Jul 1, 2:27 AM CDTRiver Flood AdvisoryLOTKankakee56 hr
Jul 1, 2:36 AM CDTRiver Flood AdvisoryLOTIroquois36 hr
Jul 1, 2:39 AM CDTRiver Flood AdvisoryLOTCook30 hr
Jul 1, 5:55 AM CDTRiver Flood WarningLOTCook21 hr
Jul 1, 7:03 AM CDTRiver Flood WarningLOTWill33 hr
Jul 1, 9:24 AM CDTRiver Flood AdvisoryLOTCook30 hr
Jul 1, 11:21 AM CDTRiver Flood AdvisoryLOTBoone56 hr
Jul 1, 11:21 AM CDTRiver Flood AdvisoryLOTWinnebago4 days
Jul 1, 11:21 AM CDTRiver Flood AdvisoryLOTOgle6 days
Jul 1, 11:21 AM CDTRiver Flood AdvisoryLOTLee5 days
Jul 1, 11:43 AM CDTRiver Flood WarningLOTLaSalle61 hr
Jun 30, 7:54 PM CDTSevere Thunderstorm WarningLOTJasper, Lake, Porter44 min
Jun 30, 10:12 PM CDTSevere Thunderstorm WarningLOTBenton, Jasper, Lake, Newton, Porter78 min
Jun 30, 10:56 PM CDTTornado WarningLOTJasper, Porter18 min
Jul 1, 2:05 AM CDTRiver Flood AdvisoryLOTLake25 hr

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.