Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 16, NWS Chicago, IL

June 18, 2015Ford County, Iroquois County, Livingston County, Illinois; Jasper County, Newton County, Indiana

NWS Chicago, IL issued this flash flood warning at Jun 18, 2015, 2:56 PM CDT for Ford County, Iroquois County, Livingston County, Illinois; Jasper County, Newton County, 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 18, 2015, 2:56 PM CDT (19:56 UTC)
Expired: Jun 18, 2015, 9:00 PM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Ford County, IL, Iroquois County, IL, Livingston County, IL, Jasper County, IN, Newton County, IN

The radar

The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 19:56 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 12:00Z, 7.9 hours before the alert went out and 101 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: 515 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 2:55 PM CDT, 1 minute earlier.

Area forecast discussion, Jun 18, 2:55 PM CDT, 1 minute before

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Hazardous weather outlook, Jun 18, 11:29 AM CDT, 3 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1129 AM CDT THU JUN 18 2015

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
191630-
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-
1129 AM CDT THU JUN 18 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SCATTERED THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:

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

  AREAS AFFECTED AND TIMING:

  ISOLATED THUNDERSTORMS WILL BE POSSIBLE THIS MORNING ACROSS
  THE REGION. THUNDERSTORMS WILL BECOME MORE NUMEROUS BY THIS
  AFTERNOON...PARTICULARLY SOUTHEAST OF A LA SALLE ILLINOIS TO
  GARY INDIANA LINE. THE GREATEST POTENTIAL FOR FLOODING OR
  ISOLATED SEVERE WEATHER WILL BE IN THESE AREAS THIS AFTERNOON
  INTO EARLY EVENING. THUNDERSTORMS SHOULD MOVE SOUTH OF THE
  OUTLOOK AREA BY LATE EVENING.

  DISCUSSION:

  A COLD FRONT WILL MOVE SOUTHEAST ACROSS THE OUTLOOK AREA
  TODAY. WITH DAYTIME HEATING THE AIR MASS WILL DESTABILIZE BY
  MIDDAY...AND THUNDERSTORMS ALONG AND AHEAD OF THE FRONT WILL
  BECOME MORE NUMEROUS AND STRONGER. BY EARLY AFTERNOON THE COLD
  FRONT IS EXPECTED TO BE PUSHING SOUTHEAST FROM A LA SALLE TO
  GARY LINE. THUNDERSTORMS SOUTH OF THIS LINE WILL HAVE THE
  GREATEST POTENTIAL TO PRODUCE TORRENTIAL RAINFALL WHICH COULD
  LEAD TO LOCALIZED FLOODING...AS WELL AS ISOLATED DAMAGING WIND
  GUSTS ABOVE 60 MPH. THUNDERSTORMS WILL THEN GRADUALLY MOVE
  SOUTH OF THE OUTLOOK AREA THIS EVENING.

PORTIONS OF THE DES PLAINES...WEST BRANCH OF THE DUPAGE...LOWER
FOX...ILLINOIS...IROQUOIS AND KANKAKEE RIVERS WILL BE IN FLOOD.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS MAINLY SOUTH
OF A PONTIAC TO VALPARAISO LINE FRIDAY THROUGH SATURDAY.

THERE WILL BE PERIODIC THUNDERSTORM CHANCES ACROSS THE OUTLOOK
AREA SATURDAY NIGHT THROUGH WEDNESDAY. SOME OF THE STORMS
SATURDAY NIGHT COULD BE SEVERE AND COULD ALSO PRODUCE LOCALLY
HEAVY RAINFALL.

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

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT...THOUGH
REPORTS OF ANY ISOLATED SEVERE WEATHER OR RAINFALL MEASUREMENTS
ARE MOST WELCOME.

&&

LMZ740>745-191630-
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-
1129 AM CDT THU JUN 18 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS.

WINDS MAY BRIEFLY BE HAZARDOUS TO SMALL CRAFT THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE ARE PERIODIC CHANCES OF THUNDERSTORMS SATURDAY NIGHT
THROUGH WEDNESDAY.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-191630-
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-
1129 AM CDT THU JUN 18 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS TODAY...MAINLY ACROSS THE
SOUTHERN HALF OF THE LAKE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE ARE PERIODIC CHANCES OF THUNDERSTORMS SATURDAY THROUGH
WEDNESDAY.

&&

KREIN

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

Special weather statement, Jun 18, 1:21 PM CDT, 1 hour 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
121 PM CDT THU JUN 18 2015

ILZ019-023-032-033-039-INZ010-011-019-181945-
KANKAKEE IL-LA SALLE IL-IROQUOIS IL-FORD IL-LIVINGSTON IL-JASPER IN-
BENTON IN-NEWTON IN-
121 PM CDT THU JUN 18 2015

...SPECIAL WEATHER STATEMENT FOR SOUTHWESTERN LA SALLE...FORD...
LIVINGSTON...SOUTHERN KANKAKEE...IROQUOIS...NEWTON...BENTON AND
SOUTHERN JASPER COUNTIES UNTIL 245 PM CDT/345 PM EDT/...

AT 118 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF THUNDERSTORMS
ALONG A LINE EXTENDING FROM NEAR HAVANA TO NEAR PAXTON TO NEAR
LEBANON...AND MOVING NORTHEAST AT 45 MPH. SCATTERED THUNDERSTORMS
WERE ALSO DEVELOPING NORTH OF THAT LINE AND MOVING NORTHEAST AT
ABOUT 45 MPH.

HALF INCH HAIL AND WINDS OF UP TO 40 TO 50 MPH WILL BE POSSIBLE WITH
THE STRONGEST STORMS. IN ADDITION...TORRENTIAL DOWNPOURS AND
OCCASIONAL TO FREQUENT LIGHTNING WILL LIKELY OCCUR.

LOCATIONS IMPACTED INCLUDE...
PONTIAC...             RENSSELAER...          WATSEKA...
PAXTON...              FAIRBURY...            GIBSON CITY...
FOWLER...              KENTLAND...            MOROCCO...
PIPER CITY...          STOCKLAND...           HANGING GROVE...
BEAVER CITY...         PERCY JUNCTION...      PERKINS...
CLAYTONVILLE...        ATKINSON...            FORESMAN...
WADENA...              FREELAND PARK...

INCLUDING THE FOLLOWING INTERSTATES...
 I-55 BETWEEN MILE MARKERS 188 AND 214.
 I-57 BETWEEN MILE MARKERS 258 AND 306.
 INDIANA I-65 BETWEEN MILE MARKERS 200 AND 223.

THIS INCLUDES... US 41 DRAGWAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

OCCASIONAL TO FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH
THESE STORMS. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A
THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4062 8846 4062 8858 4076 8858 4075 8893
      4093 8893 4093 8905 4106 8905 4106 8693
      4091 8693 4091 8699 4084 8699 4084 8710
      4048 8710 4049 8793 4040 8793 4040 8846
TIME...MOT...LOC 1818Z 246DEG 40KT 4030 8995 4049 8820 4006 8652

RC

Local storm report, Jun 18, 2:49 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
249 PM CDT THU JUN 18 2015

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

0230 PM     HEAVY RAIN       1 ESE PONTIAC           40.87N 88.63W
06/18/2015  M0.92 INCH       LIVINGSTON         IL   COCORAHS

            RAIN FALL IN 20 MINUTES. TORRENTIAL DOWNPOUR.

&&

C

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 8:29 PM CDT	River Flood Advisory	LOT	Iroquois	36 hr
Jun 18, 7:44 AM CDT	Special Marine Warning	LOT		91 min
Jun 18, 7:52 AM CDT	Areal Flood Advisory	LOT	Cook, DuPage	113 min
Jun 18, 7:53 AM CDT	Special Weather Statement	LOT	Cook, DuPage	52 min
Jun 18, 8:49 AM CDT	River Flood Advisory	LOT	DeKalb	8 hr
Jun 18, 1:21 PM CDT	Special Weather Statement	LOT	Ford, Iroquois, Livingston	84 min
Jun 18, 3:30 PM CDT	Flash Flood Warning	LOT	Kankakee	6 hr
Jun 18, 3:59 PM CDT	River Flood Warning	LOT	Kane, Kendall	15 hr
Jun 18, 4:02 PM CDT	Small Craft Advisory	LOT		6 hr
Jun 18, 4:30 PM CDT	River Flood Advisory	LOT	DuPage	17 hr

Nearby

Flash Flood Warnings in Illinois, 2015 Flash Flood Warnings in Indiana, 2015 Every 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.