Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 1, NWS Chicago, IL

May 13, 20108 counties in Illinois

NWS Chicago, IL issued this flash flood warning at May 13, 2010, 2:24 AM CDT for 8 counties in 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: May 13, 2010, 2:24 AM CDT (07:24 UTC)
Expired: May 13, 2010, 8:15 AM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Boone County, IL, DeKalb County, IL, Kane County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 80 km from the middle of the area, began a volume at 07:26 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, 7.4 hours before the alert went out and 140 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 452 m²/s²
0-3 km storm-relative helicity: 677 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 May 13, 1:28 AM CDT, 56 minutes earlier.

Area forecast discussion, May 13, 1:28 AM CDT, 56 minutes before

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Hazardous weather outlook, May 12, 9:00 PM CDT, 5 hours 24 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
900 PM CDT WED MAY 12 2010

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
140200-
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-
900 PM CDT WED MAY 12 2010 /1000 PM EDT WED MAY 12 2010/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

 HEAVY RAIN WITH UP TO 2 TO 3 INCHES OR RAINFALL IN 6 HOURS.
 LOCAL FLOODING IS POSSIBLE.

 AREAS AFFECTED AND TIMING:

 SHOWERS AND THUNDERSTORMS WILL SPREAD ACROSS NORTH CENTRAL
 ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA DURING
 THE REST OF TONIGHT AND THURSDAY MORNING.

  DISCUSSION:

 A WARM FRONT WILL MOVE INTO AND THROUGH NORTHERN ILLINOIS AND
 NORTHWEST INDIANA BY THURSDAY MORNING.

 SOME STREAMS MAY EXPERIENCE RISES TO NEAR BANK FULL TONIGHT.

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

THUNDERSTORMS ARE LIKELY THURSDAY. SOME OF THE THUNDERSTORMS
COULD PRODUCE DAMAGING WINDS AND LARGE HAIL.

THERE IS A CHANCE OF THUNDERSTORMS MONDAY THROUGH TUESDAY.

RIVERS MAY REACH BANK FULL AND APPROACH FLOOD STAGE THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD BE ALERT FOR POSSIBLE FLOODING OVERNIGHT. REPORT
FLOODING IF IT OCCURS.

&&

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

LMZ740>745-140200-
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-
900 PM CDT WED MAY 12 2010

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

.DAY ONE...TONIGHT.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT FOR THE ILLINOIS NEARSHORE TONIGHT. THUNDERSTORMS ARE
LIKELY OVERNIGHT.

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

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT FOR THE ILLINOIS NEARSHORE THURSDAY.

THUNDERSTORMS ARE LIKELY THURSDAY. A CHANCE OF THUNDERSTORMS
MONDAY THROUGH TUESDAY.

&&

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-
870-872-874-876-878-140200-
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 TOW 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-
900 PM CDT WED MAY 12 2010

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

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY TONIGHT.

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

THUNDERSTORMS ARE LIKELY THURSDAY. A CHANCE OF THUNDERSTORMS
MONDAY THROUGH TUESDAY.

&&

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

In the hours before

Local storm report, May 12, 11:05 PM CDT, 3 hours 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1105 PM CDT WED MAY 12 2010

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

1058 PM     HAIL             FRANKLIN GROVE          41.84N 89.30W
05/12/2010  E1.00 INCH       LEE                IL   BROADCAST MEDIA

&&

Local storm report, May 13, 12:49 AM CDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1249 AM CDT THU MAY 13 2010

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

1245 AM     HAIL             MANHATTAN               41.43N 87.99W
05/13/2010  E0.75 INCH       WILL               IL   PUBLIC

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 9:51 PM CDT	River Flood Watch	LOT	Kane, McHenry	13 hr
May 12, 10:19 PM CDT	River Flood Advisory	LOT	Kane, Kendall	12 hr
May 12, 10:19 PM CDT	River Flood Advisory	LOT	LaSalle	31 hr
May 12, 10:19 PM CDT	River Flood Advisory	LOT	Will	54 hr
May 12, 10:19 PM CDT	River Flood Advisory	LOT	Ogle	12 hr
May 12, 10:19 PM CDT	River Flood Advisory	LOT	Cook	11 hr
May 12, 11:21 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kankakee, Livingston	24 min
May 13, 4:33 AM CDT	Areal Flood Advisory	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kendall and 4 more	5 hr
May 13, 6:07 AM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane, Lake, McHenry	6 hr
May 13, 6:09 AM CDT	River Flood Advisory	LOT	Cook	5 hr
May 13, 6:13 AM CDT	River Flood Warning	LOT	Lake	6 days
May 13, 6:25 AM CDT	River Flood Advisory	LOT	Boone	4 hr
May 13, 6:25 AM CDT	River Flood Advisory	LOT	DeKalb	4 hr
May 13, 7:42 AM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	48 min
May 13, 8:19 AM CDT	Areal Flood Warning	LOT	Boone, DeKalb, Kane, Kendall, LaSalle, Lee and 3 more	8 hr
May 13, 9:55 AM CDT	River Flood Warning	LOT	Boone	12 hr
May 13, 9:55 AM CDT	River Flood Warning	LOT	Winnebago	4 days
May 13, 9:55 AM CDT	River Flood Warning	LOT	Winnebago	12 hr
May 13, 9:55 AM CDT	River Flood Warning	LOT	Ogle	12 hr
May 13, 9:55 AM CDT	River Flood Warning	LOT	DeKalb	19 hr
May 13, 10:05 AM CDT	River Flood Advisory	LOT	Winnebago	13 hr
May 13, 10:31 AM CDT	River Flood Warning	LOT	Kane, McHenry	4 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	Kane, Kendall	4 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	LaSalle	58 hr
May 13, 10:31 AM CDT	River Flood Warning	LOT	Lake	5 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	Lake	11 hr
May 13, 10:31 AM CDT	River Flood Warning	LOT	Cook	4 days
May 13, 10:31 AM CDT	River Flood Warning	LOT	Cook	58 hr
May 13, 11:12 AM CDT	River Flood Warning	LOT	Bureau, LaSalle	5 days
May 13, 12:00 PM CDT	Areal Flood Warning	LOT	Cook, Lake	4 hr
May 13, 4:01 PM CDT	Areal Flood Warning	LOT	Boone, Cook, DeKalb, Kane, Lake, Lee and 3 more	18 hr
May 12, 10:06 PM CDT	River Flood Warning	LOT	Lake	11 hr
May 13, 3:44 AM CDT	Flash Flood Warning	LOT	Porter	5 hr
May 13, 10:59 AM CDT	River Flood Warning	LOT	Lake, Newton	4 days

Nearby

Flash Flood Warnings in Illinois, 2010 Every flash flood warning in 2010

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.