Alert archive / Indiana / Flash Flood Warnings in 2015

Flash Flood Warning 19, NWS Chicago, IL

June 20, 2015Iroquois County, Kankakee County, Will County, Illinois; 4 counties in Indiana

NWS Chicago, IL issued this flash flood warning at Jun 20, 2015, 10:59 PM CDT for Iroquois County, Kankakee County, Will County, Illinois; 4 counties in Indiana. 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 20, 2015, 10:59 PM CDT (03:59 UTC)
Expired
Jun 21, 2015, 5:00 AM CDT
In force
6 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties Iroquois County, IL, Kankakee County, IL, Will County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 66 km from the middle of the area, began a volume at 04:00 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, 4.0 hours before the alert went out and 147 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, Lincoln, IL at 00:00Z on 2015-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 143 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2015-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.193958Sfc1 km3 km6 km9 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
143 J/kg
Mixed-layer CIN
-493 J/kg
Mixed-layer LCL
1524 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 20, 10:32 PM CDT, 27 minutes earlier.

Area forecast discussion, Jun 20, 10:32 PM CDT, 27 minutes before
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Hazardous weather outlook, Jun 20, 4:42 PM CDT, 6 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
442 PM CDT SAT JUN 20 2015

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
212145-
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-
442 PM CDT SAT JUN 20 2015

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SCATTERED THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:

   TORRENTIAL RAINFALL.
   FREQUENT CLOUD TO GROUND LIGHTNING.
   WIND GUSTS OVER 60 MPH.
   QUARTER SIZED HAIL.

  AREAS AFFECTED AND TIMING:

 SHOWERS AND THUNDERSTORMS ARE LIKELY OVER NORTH CENTRAL ILLINOIS
 LATE THIS AFTERNOON...AND THEN LIKELY ACROSS THE ENTIRE OUTLOOK
 AREA FROM EARLY TO MID EVENING. THE HIGHEST THREAT FOR STRONG TO
 SEVERE STORMS AND THUNDERSTORMS PRODUCING FREQUENT CLOUD TO
 GROUND LIGHTNING WILL PASS WEST OF A BYRON TO OTTAWA TO PAXTON
 LINE.

  DISCUSSION:

 A COLD FRONT WILL SINK SOUTHEAST THROUGH THE REGION THIS
 EVENING...WITH AN AREA OF THUNDERSTORMS FORMING AHEAD OF THE
 FRONT. A MOIST AIRMASS WILL ALSO BE IN PLACE SO TORRENTIAL
 DOWNPOURS ARE LIKELY WITH WELL ORGANIZED THUNDERSTORMS. GIVEN
 THE RECENT HEAVY RAINFALL...FLASH FLOODING IS POSSIBLE ALONG
 WITH RISES ON LOCAL RIVERS AND STREAMS. THE MAIN SEVERE WEATHER
 THREATS WILL BE LARGE HAIL AND ISOLATED DAMAGING WIND GUSTS.

MODERATE TO MAJOR FLOODING CONTINUES ON PORTIONS OF THE KANKAKEE
AND IROQUOIS RIVERS IN NORTHWEST INDIANA...AND MODERATE FLOODING
CONTINUES ON THE ILLINOIS RIVER NEAR LA SALLE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE ARE PERIODIC THUNDERSTORM CHANCES ACROSS THE ENTIRE OUTLOOK
AREA SUNDAY THROUGH FRIDAY. SOME OF THE STORMS ON MONDAY COULD BE
STRONG TO SEVERE AND PRODUCE HEAVY RAINFALL.

PORTIONS OF THE ILLINOIS...IROQUOIS AND KANKAKEE RIVERS WILL
REMAIN IN FLOOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED IN PORTIONS OF THE OUTLOOK AREA THIS
EVENING.

&&

LMZ740>745-212145-
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-
442 PM CDT SAT JUN 20 2015

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

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING AND
OVERNIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE ARE PERIODIC CHANCES OF THUNDERSTORMS MONDAY THROUGH
FRIDAY.

WINDS HAZARDOUS TO SMALL CRAFT ARE POSSIBLE MONDAY AFTERNOON
THROUGH MONDAY EVENING.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-212145-
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-
442 PM CDT SAT JUN 20 2015

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

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING AND OVERNIGHT
ACROSS THE ENTIRE LAKE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE ARE PERIODIC CHANCES OF THUNDERSTORMS MONDAY THROUGH
FRIDAY.

&&

RODRIGUEZ

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSCHICAGO
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

In the hours before

Local storm report, Jun 20, 9:11 PM CDT, 1 hour 48 minutes before
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Special weather statement, Jun 20, 9:23 PM CDT, 1 hour 36 minutes before
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Special weather statement, Jun 20, 9:47 PM CDT, 1 hour 12 minutes before
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Special weather statement, Jun 20, 9:50 PM CDT, 1 hour 9 minutes before
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Special weather statement, Jun 20, 10:28 PM CDT, 31 minutes before
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Local storm report, Jun 20, 10:51 PM CDT, 8 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 7:17 PM CDTSpecial Weather StatementLOTKendall28 min
Jun 20, 7:38 PM CDTSpecial Weather StatementLOTWill52 min
Jun 20, 8:37 PM CDTRiver Flood AdvisoryLOTKane, Kendall47 hr
Jun 20, 9:00 PM CDTSpecial Weather StatementLOTWill30 min
Jun 20, 9:23 PM CDTSpecial Weather StatementLOTWill37 min
Jun 20, 9:24 PM CDTAreal Flood AdvisoryLOTCook, DuPage, Will3 hr
Jun 20, 9:26 PM CDTSpecial Marine WarningLOT94 min
Jun 20, 9:47 PM CDTSpecial Weather StatementLOTGrundy, LaSalle, Livingston43 min
Jun 20, 9:57 PM CDTSevere Thunderstorm WarningLOTLaSalle, Livingston33 min
Jun 20, 10:15 PM CDTFlash Flood WarningLOTFord, Grundy, Iroquois, Kankakee, LaSalle, Livingston and 1 more6 hr
Jun 20, 10:28 PM CDTSpecial Weather StatementLOTFord47 min
Jun 20, 10:46 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston74 min
Jun 21, 12:01 AM CDTAreal Flood AdvisoryLOTIroquois6 hr
Jun 21, 1:34 AM CDTRiver Flood AdvisoryLOTIroquois, Kankakee36 hr
Jun 21, 6:16 AM CDTRiver Flood WarningLOTIroquois, Kankakee4 days
Jun 21, 6:16 AM CDTRiver Flood WarningLOTGrundy, Will5 days
Jun 21, 6:33 AM CDTRiver Flood AdvisoryLOTIroquois36 hr
Jun 21, 9:01 AM CDTMarine Dense Fog AdvisoryLOT25 hr
Jun 21, 9:39 AM CDTRiver Flood WarningLOTIroquois33 hr
Jun 21, 11:03 AM CDTRiver Flood WarningLOTGrundy4 days
Jun 21, 3:06 PM CDTSmall Craft AdvisoryLOT25 hr
Jun 20, 9:50 PM CDTSpecial Weather StatementLOTLake, Porter40 min
Jun 20, 11:24 PM CDTSevere Thunderstorm WarningLOTBenton, Jasper, Newton54 min

Nearby

Flash Flood Warnings in Indiana, 2015Flash Flood Warnings in Illinois, 2015Every flash flood warning in 2015

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.