Alert archive / Illinois / Flash Flood Warnings in 2013

Flash Flood Warning 24, NWS Chicago, IL

June 26, 2013Boone County, Winnebago County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 26, 2013, 10:23 AM CDT for Boone County, Winnebago 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 26, 2013, 10:23 AM CDT (15:23 UTC)
Expired: Jun 26, 2013, 4:30 PM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Boone County, IL, Winnebago County, IL

The radar

The Milwaukee radar (KMKX), 80 km from the middle of the area, began a volume at 15:25 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 12:00Z, 3.4 hours before the alert went out and 148 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: 12 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 1376 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 106 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 26, 9:20 AM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Jun 26, 9:20 AM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, Jun 26, 5:19 AM CDT, 5 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
519 AM CDT WED JUN 26 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
271030-
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-
519 AM CDT WED JUN 26 2013 /619 AM EDT WED JUN 26 2013/

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

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

   THUNDERSTORMS...THE STRONGEST MAY PRODUCE:
    HEAVY RAIN AND FLASH FLOODING
    FREQUENT CLOUD TO GROUND LIGHTNING.
    HAIL TO THE SIZE OF QUARTERS.
    WINDS TO 60 MPH.

  AREAS AFFECTED AND TIMING:

   EARLY THIS MORNING THE HEAVIEST RAINFALL WILL BE ACROSS FAR
   NORTHERN ILLINOIS...BUT THE FOCUS WILL GRADUALLY SHIFT SOUTH
   AS THE DAY PROGRESSES. NEW DEVELOPMENT THIS AFTERNOON AND
   EVENING ALSO WOULD HAVE THE POTENTIAL TO PRODUCE HEAVY RAIN
   ALONG WITH LARGE HAIL AND STRONG WINDS...BUT THE TIMING AND
   EXTENT OF THIS ACTIVITY IS LESS CERTAIN AT THIS TIME.

  DISCUSSION:

   CONVECTIVE ACTIVITY OVER AND UPSTREAM OF THE AREA EARLY THIS
   MORNING IS EXPECTED TO DECREASE IN COVERAGE AND INTENSITY
   FAIRLY SOON AFTER SUNRISE...THOUGH A FEW SHOWERS COULD LINGER
   INTO MID MORNING. ANY OF THE STORMS THIS MORNING...OR NEW
   STORMS THAT MAY DEVELOP THIS AFTERNOON OR EVENING...WOULD HAVE
   THE POTENTIAL TO GENERATE HEAVY RAINFALL RATES THAT COULD
   RESULT IN FLASH FLOODING. HAIL AND STRONG WINDS ALSO ARE A
   POSSIBILITY...BUT MORE LIKELY TOWARD LATE AFTERNOON OR EVENING
   IF NEW STORMS DO MANAGE TO DEVELOP.

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

THERE WILL PERIODIC BUT LESSER CHANCES FOR THUNDERSTORMS THURSDAY
AND FRIDAY.

RUNOFF FROM THUNDERSTORMS AND HEAVY RAIN THIS WEEK COULD PRODUCE
SIGNIFICANT RISES ON AREA RIVERS OVER THE NEXT THREE DAYS. THE
FOX...ROCK...DES PLAINES...ILLINOIS...AND PECATONICA ARE FORECAST
TO APPROACH OR EXCEED FLOOD OR ACTION STAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED THROUGH THE DAY TO REPORT HEAVY RAINFALL OR
ANY SEVERE WEATHER THAT MAY OCCUR.

&&

LMZ740>745-271030-
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-
519 AM CDT WED JUN 26 2013

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

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE LIKELY EARLY THIS MORNING...AND THERE IS A
CONTINUED CHANCE OF THUNDERSTORMS LATER TODAY AND TONIGHT. SOME
STORMS MAY PRODUCE SMALL HAIL AND GUSTY WINDS IN EXCESS OF 30
KT.

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

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS THURSDAY
THROUGH FRIDAY...WITH LESSER CHANCES THIS WEEKEND INTO EARLY NEXT
WEEK.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-271030-
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-
519 AM CDT WED JUN 26 2013

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

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE LIKELY EARLY THIS MORNING ACROSS THE SOUTHERN
PORTION OF THE LAKE...AND THERE IS A CONTINUED CHANCE OF
THUNDERSTORMS THIS AFTERNOON AND EVENING. SOME COULD PRODUCE
STRONG WINDS AND SMALL HAIL.

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

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS THURSDAY AND
FRIDAY...WITH LESSER CHANCES THIS WEEKEND INTO EARLY NEXT WEEK.

&&

LENNING

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 26, 8:58 AM CDT, 1 hour 25 minutes before

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Special weather statement, Jun 26, 9:03 AM CDT, 1 hour 20 minutes before

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Local storm report, Jun 26, 9:21 AM CDT, 1 hour 2 minutes before

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Special weather statement, Jun 26, 9:25 AM CDT, 58 minutes before

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Special weather statement, Jun 26, 9:52 AM CDT, 31 minutes before

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Local storm report, Jun 26, 9:57 AM CDT, 26 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 25, 11:28 PM CDT	River Flood Watch	LOT	Bureau, LaSalle	12 hr
Jun 25, 11:28 PM CDT	Special Weather Statement	LOT	Iroquois	47 min
Jun 25, 11:33 PM CDT	River Flood Advisory	LOT	Lee	11 hr
Jun 25, 11:33 PM CDT	River Flood Advisory	LOT	Kane, Kendall	12 hr
Jun 26, 12:11 AM CDT	Special Weather Statement	LOT	Iroquois	34 min
Jun 26, 2:53 AM CDT	Special Weather Statement	LOT	Boone	37 min
Jun 26, 3:52 AM CDT	Areal Flood Advisory	LOT	Boone, McHenry	6 hr
Jun 26, 4:33 AM CDT	Areal Flood Advisory	LOT	Cook, Lake, McHenry	6 hr
Jun 26, 5:26 AM CDT	Flash Flood Warning	LOT	Boone, Cook, Lake, McHenry	6 hr
Jun 26, 5:43 AM CDT	River Flood Warning	LOT	Winnebago	10 days
Jun 26, 7:13 AM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane	4 hr
Jun 26, 8:34 AM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Kankakee, Kendall, LaSalle, Livingston and 1 more	26 min
Jun 26, 8:37 AM CDT	River Flood Warning	LOT	Cook	56 hr
Jun 26, 8:37 AM CDT	River Flood Warning	LOT	Kane, McHenry	9 days
Jun 26, 9:03 AM CDT	Special Weather Statement	LOT	Ford, Iroquois, Kankakee, Will	57 min
Jun 26, 9:25 AM CDT	Special Weather Statement	LOT	Boone, DeKalb, McHenry, Winnebago	65 min
Jun 26, 9:43 AM CDT	Areal Flood Advisory	LOT	Boone, Winnebago	3 hr
Jun 26, 9:52 AM CDT	Special Weather Statement	LOT	Cook	38 min
Jun 26, 10:14 AM CDT	River Flood Warning	LOT	Winnebago	9 days
Jun 26, 10:37 AM CDT	River Flood Watch	LOT	Lee	5 hr
Jun 26, 10:38 AM CDT	Flash Flood Warning	LOT	Boone, Cook, DuPage, Kane, Lake, McHenry	6 hr
Jun 26, 10:56 AM CDT	River Flood Advisory	LOT	Boone	5 hr
Jun 26, 10:56 AM CDT	River Flood Advisory	LOT	Winnebago	5 hr
Jun 26, 11:06 AM CDT	River Flood Warning	LOT	Kane, Kendall	6 days
Jun 26, 11:19 AM CDT	River Flood Watch	LOT	Cook	22 hr
Jun 26, 11:22 AM CDT	River Flood Advisory	LOT	Lake	70 hr
Jun 26, 11:34 AM CDT	River Flood Advisory	LOT	Cook	23 hr
Jun 26, 11:44 AM CDT	River Flood Advisory	LOT	Bureau, LaSalle	23 hr
Jun 26, 1:37 PM CDT	River Flood Advisory	LOT	Lake	16 hr
Jun 26, 3:46 PM CDT	River Flood Warning	LOT	Ogle	5 days
Jun 26, 3:46 PM CDT	River Flood Warning	LOT	Lee	28 hr
Jun 26, 3:46 PM CDT	River Flood Warning	LOT	Boone	42 hr
Jun 26, 3:46 PM CDT	River Flood Warning	LOT	Winnebago	60 hr
Jun 26, 3:46 PM CDT	River Flood Warning	LOT	Winnebago	28 hr
Jun 26, 4:27 PM CDT	Flash Flood Warning	LOT	Boone, Cook, Kane, Lake, McHenry	18 hr
Jun 25, 7:46 PM CDT	Severe Thunderstorm Warning	LOT	Porter	29 min
Jun 26, 7:25 AM CDT	Flash Flood Warning	LOT	Lake, Porter	6 hr
Jun 26, 4:11 PM CDT	Special Weather Statement	LOT	Jasper	34 min

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.