Alert archive / Illinois / Flash Flood Warnings in 2013

Flash Flood Warning 5, NWS Chicago, IL

April 17, 2013Grundy County, LaSalle County, Livingston County, Illinois

NWS Chicago, IL issued this flash flood warning at Apr 17, 2013, 7:44 PM CDT for Grundy County, LaSalle County, Livingston County, Illinois. It was in force for 8 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: Apr 17, 2013, 7:44 PM CDT (00:44 UTC)
Expired: Apr 18, 2013, 3:30 AM CDT
In force: 8 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Grundy County, IL, LaSalle County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 66 km from the middle of the area, began a volume at 00:46 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, 0.7 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 412 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 356 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.4

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 Apr 17, 6:53 PM CDT, 51 minutes earlier.

Area forecast discussion, Apr 17, 6:53 PM CDT, 51 minutes before

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Hazardous weather outlook, Apr 17, 4:30 PM CDT, 3 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
430 PM CDT WED APR 17 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
182130-
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-
430 PM CDT WED APR 17 2013 /530 PM EDT WED APR 17 2013/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...A FEW MAY PRODUCE:
  HAIL TO ONE INCH.
  STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
  HEAVY RAINFALL PRODUCING LOCALIZED FLOODING.
  ISOLATED TORNADOES.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS WERE OCCURRING ACROSS MUCH OF THE OUTLOOK AREA
  THIS AFTERNOON...AND WILL CONTINUE TO AFFECT MUCH OF THE
  OUTLOOK AREA THROUGH THE REMAINDER OF THE AFTERNOON AND EARLY
  EVENING HOURS. THE STRONGEST STORMS CAPABLE OF PRODUCING
  DAMAGING WIND GUSTS...HAIL AND POSSIBLY ISOLATED TORNADOES
  WILL MAINLY AFFECT AREAS SOUTHEAST OF THE INTERSTATE 55 CORRIDOR
  ACROSS EAST CENTRAL ILLINOIS AND PARTS OF NORTHWEST INDIANA.
  ADDITIONAL ROUNDS OF THUNDERSTORMS AND LOCALLY HEAVY RAINFALL
  CAN BE EXPECTED THROUGH THE EVENING AND EARLY OVERNIGHT HOURS.

  DISCUSSION:

  A WAVE OF LOW PRESSURE WAS OVER WESTERN MISSOURI THIS AFTERNOON
  WITH A WARM FRONT EXTENDING EAST ACROSS CENTRAL ILLINOIS AND
  CENTRAL INDIANA. THIS WARM FRONT WILL CONTINUE TO LIFT NORTH
  ACROSS SOUTHERN PARTS OF THE OUTLOOK AREA INTO THIS EVENING
  AS THE LOW DEEPENS TO OUR WEST. THE FRONT WILL EVENTUALLY LIFT
  NORTH OF THE OUTLOOK AREA...ALONG THE ILLINOIS AND WISCONSIN
  BORDER THURSDAY MORNING. A SERIES OF UPPER LEVEL DISTURBANCES
  WILL RIPPLE NORTHEAST ACROSS THE AREA THROUGH THE NIGHT...
  MAINTAINING THE THREAT OF HEAVY RAIN AND ELEVATED HAIL
  PRODUCING STORMS WELL NORTH OF THE SURFACE WARM FRONT.
  SEVERE THUNDERSTORMS ARE MOST LIKELY LATE THIS AFTERNOON INTO
  EARLY THIS EVENING ACROSS THE SOUTHERN PORTIONS OF THE OUTLOOK
  AREA WHERE MORE NEAR SURFACE INSTABILITY WILL BE PRESENT CLOSER
  TO THE APPROACHING SURFACE WARM FRONT. ANY OF THESE STORMS WILL
  BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL...WITH REPEATED
  TRAINING OF HEAVY RAIN PRODUCING STORMS LEADING TO AREAS OF
  FLOODING.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE DUE TO RECENT RAINFALL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THERE IS A SIGNIFICANT POTENTIAL FOR SEVERE WEATHER ACROSS THE
OUTLOOK AREA THURSDAY AND THURSDAY EVENING...PARTICULARLY ACROSS
AREAS ROUGHLY ALONG AND EAST OF THE INTERSTATE 55 CORRIDOR WHERE
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS. THE GREATEST
THREATS ARE EXPECTED TO BE DAMAGING THUNDERSTORM WINDS IN EXCESS
OF 60 MPH AND HAIL LARGER THAN 1 INCH IN DIAMETER...THOUGH THE
POTENTIAL FOR ISOLATED TORNADOES WILL ALSO EXIST ESPECIALLY
ACROSS THE MODERATE RISK AREA.

SEVERAL ROUNDS OF HEAVY RAIN PRODUCING THUNDERSTORMS WILL ALSO
CONTINUE TO PRODUCE A SIGNIFICANT FLOODING THREAT...WITH MANY
AREA RIVERS ALREADY AT OR ABOVE FLOOD STAGE. LOCALLY HEAVY
RAINFALL WILL ALSO LIKELY CONTINUE TO RESULT IN FLOODING OF LOW
LYING URBAN AREAS.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE FOR MANY DAYS DUE TO RECENT RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE NEEDED THIS AFTERNOON AND THIS EVENING IN CURRENT
SEVERE WEATHER WATCH AREAS. REPORTS OF FLOODING...RAINFALL
MEASUREMENTS AND HAIL ARE WELCOME.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ740>745-182130-
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-
430 PM CDT WED APR 17 2013

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

.DAY ONE...TONIGHT.

PERIODIC THUNDERSTORMS ARE LIKELY TONIGHT. A FEW THUNDERSTORMS
COULD PRODUCE STRONG...GUSTY WINDS.

GALE FORCE WINDS ARE LIKELY TOWARD MORNING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

PERIODIC THUNDERSTORMS ARE LIKELY THURSDAY INTO THURSDAY EVENING.
SOME STORMS MAY BE SEVERE WITH STRONG GUSTY WINDS AND LARGE HAIL.

GALE FORCE WINDS ARE LIKELY THURSDAY INTO THURSDAY EVENING...AND
AGAIN DURING THE DAY FRIDAY. HIGH WAVES WILL LIKELY CONTINUE TO
PRODUCE HAZARDOUS CONDITIONS FOR SMALL CRAFT THROUGH FRIDAY NIGHT
PARTICULARLY ALONG THE INDIANA SHORE.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-182130-
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-
430 PM CDT WED APR 17 2013

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

.DAY ONE...TONIGHT.

PERIODIC THUNDERSTORMS ARE LIKELY TONIGHT ACROSS THE SOUTHERN
HALF OF LAKE MICHIGAN. A FEW THUNDERSTORMS MAY PRODUCE STRONG
GUSTY WINDS. A FEW GALE FORCE GUSTS MAY OCCUR THIS EVENING
THROUGH TONIGHT MAINLY FOR THE SOUTHERN TIP OF LAKE MICHIGAN.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THUNDERSTORMS ARE LIKELY ACROSS MUCH OF LAKE MICHIGAN THROUGH
THURSDAY. SOME STORMS COULD BE SEVERE WITH GUSTY WINDS AND HAIL
ESPECIALLY ACROSS THE SOUTHERN PART OF THE LAKE.

GALE FORCE WINDS ARE LIKELY FROM LATE THURSDAY NIGHT INTO
FRIDAY NIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

RATZER

In the hours before

Local storm report, Apr 17, 7:08 PM CDT, 36 minutes before

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Local storm report, Apr 17, 7:23 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
723 PM CDT WED APR 17 2013

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

0700 PM     HEAVY RAIN       ROCKFORD AIRPORT        42.20N 89.10W
04/17/2013  M2.39 INCH       WINNEBAGO          IL   ASOS

            RAINFALL TOTAL TODAY SO FAR.

&&

RC

Special weather statement, Apr 17, 7:31 PM CDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
731 PM CDT WED APR 17 2013

ILZ033-180100-
IROQUOIS IL-
731 PM CDT WED APR 17 2013

...SPECIAL WEATHER STATEMENT...

AT 731 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR CISSNA PARK...MOVING NORTH AT 45 MPH.

UP TO PENNY SIZE HAIL...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF
HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY RAINFALL
COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR VISIBILITY. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

&&

LAT...LON 4098 8813 4099 8754 4050 8763 4050 8811
TIME...MOT...LOC 0031Z 193DEG 37KT 4057 8792

BMD

Local storm report, Apr 17, 7:33 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
733 PM CDT WED APR 17 2013

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

0700 PM     HEAVY RAIN       OHARE AIRPORT           41.98N 87.90W
04/17/2013  M1.20 INCH       COOK               IL   ASOS

            RAINFALL SO FAR FOR THE DAY.

0700 PM     HEAVY RAIN       WAUKEGAN                42.37N 87.87W
04/17/2013  M1.82 INCH       LAKE               IL   ASOS

            RAINFALL SO FAR TODAY.

0700 PM     HEAVY RAIN       AURORA                  41.77N 88.29W
04/17/2013  M1.30 INCH       KANE               IL   ASOS

            RAINFALL SO FAR TODAY

&&

BN

Local storm report, Apr 17, 7:33 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
733 PM CDT WED APR 17 2013

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

0700 PM     HEAVY RAIN       OHARE AIRPORT           41.98N 87.90W
04/17/2013  M0.00 INCH       COOK               IL   ASOS

            RAINFALL SO FAR FOR THE DAY.

0700 PM     HEAVY RAIN       WAUKEGAN                42.37N 87.87W
04/17/2013  M1.82 INCH       LAKE               IL   ASOS

            RAINFALL SO FAR TODAY.

0700 PM     HEAVY RAIN       AURORA                  41.77N 88.29W
04/17/2013  M1.30 INCH       KANE               IL   ASOS

            RAINFALL SO FAR TODAY

&&

BN

Local storm report, Apr 17, 7:44 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
744 PM CDT WED APR 17 2013

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

0740 PM     HEAVY RAIN       2 W OAK BROOK           41.84N 87.99W
04/17/2013  M1.75 INCH       DUPAGE             IL   CO-OP OBSERVER

            STORM TOTAL SO FAR. PONDING OF WATER IN YARD.

&&

BN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:31 PM CDT	Special Weather Statement	LOT	Iroquois	29 min
Apr 17, 8:29 PM CDT	River Flood Warning	LOT	Boone	3 days
Apr 17, 8:31 PM CDT	River Flood Watch	LOT	DeKalb	8 hr
Apr 17, 9:03 PM CDT	River Flood Warning	LOT	Kankakee	62 hr
Apr 17, 9:03 PM CDT	River Flood Warning	LOT	Grundy, Will	56 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Iroquois	23 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Iroquois, Kankakee	33 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Iroquois	23 hr
Apr 17, 9:15 PM CDT	Small Craft Advisory	LOT		10 hr
Apr 17, 9:20 PM CDT	River Flood Warning	LOT	Will	4 days
Apr 17, 9:20 PM CDT	River Flood Warning	LOT	DuPage	3 days
Apr 17, 9:23 PM CDT	River Flood Warning	LOT	LaSalle	3 days
Apr 17, 9:27 PM CDT	River Flood Watch	LOT	Livingston	23 hr
Apr 17, 10:31 PM CDT	River Flood Warning	LOT	Grundy	7 days
Apr 17, 10:31 PM CDT	River Flood Warning	LOT	Grundy	53 hr
Apr 17, 10:31 PM CDT	River Flood Warning	LOT	Cook	39 hr
Apr 18, 2:15 AM CDT	Areal Flood Warning	LOT	Grundy, Kankakee, LaSalle, Livingston, Will	10 hr
Apr 18, 3:19 AM CDT	Gale Watch	LOT		12 hr
Apr 18, 3:19 AM CDT	Gale Warning	LOT		48 hr
Apr 18, 4:01 AM CDT	Wind Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	5 hr
Apr 18, 4:05 AM CDT	Flash Flood Warning Emergency	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kendall and 3 more	8 hr
Apr 18, 4:34 AM CDT	Special Marine Warning	LOT		116 min
Apr 18, 4:52 AM CDT	River Flood Warning	LOT	DeKalb	33 hr
Apr 18, 5:45 AM CDT	River Flood Warning	LOT	Cook	46 hr
Apr 18, 5:58 AM CDT	Flash Flood Warning	LOT	Cook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more	8 hr
Apr 18, 6:14 AM CDT	Special Weather Statement	LOT	Cook, DuPage, Grundy, Kankakee, Kendall, LaSalle and 2 more	61 min
Apr 18, 6:45 AM CDT	Special Marine Warning	LOT		2 hr
Apr 18, 7:06 AM CDT	Special Weather Statement	LOT	Cook, DuPage, Kankakee, Will	39 min
Apr 18, 7:09 AM CDT	Special Weather Statement	LOT	Cook, DuPage, Kankakee, Will	36 min
Apr 18, 7:18 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kankakee, Will	57 min
Apr 18, 7:24 AM CDT	Special Marine Warning	LOT		2 hr
Apr 18, 8:09 AM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee	96 min
Apr 18, 12:00 PM CDT	Flash Flood Warning	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 5 more	8 hr
Apr 18, 1:28 PM CDT	Areal Flood Warning	LOT	Boone, DeKalb, Kane, Lake, Lee, McHenry and 2 more	6 hr
Apr 18, 4:52 PM CDT	Small Craft Advisory	LOT		5 hr
Apr 17, 8:05 PM CDT	River Flood Warning	LOT	Lake	65 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Porter	28 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Jasper, Porter	28 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Jasper	27 hr
Apr 17, 9:14 PM CDT	River Flood Watch	LOT	Newton	24 hr

Nearby

Flash Flood Warnings in Illinois, 2013 Every flash flood warning in 2013

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.