Alert archive / Illinois / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 10, NWS Chicago, IL

April 17, 2013LaSalle County, Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Apr 17, 2013, 6:48 PM CDT for LaSalle County, Livingston County, Illinois. It was in force for 57 min. 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, 6:48 PM CDT (23:48 UTC)
Expired
Apr 17, 2013, 7:45 PM CDT
In force
57 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties LaSalle County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 23:51 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 17, 9:14 AM CDTSevere Thunderstorm WatchSPC10 hr
Apr 17, 3:33 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 108 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 12:00Z on 2013-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2013-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
540 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
299 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Apr 17, 5:40 PM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Apr 17, 5:40 PM CDT, 1 hour 8 minutes before
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Hazardous weather outlook, Apr 17, 4:30 PM CDT, 2 hours 18 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, 5:27 PM CDT, 1 hour 21 minutes before
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Local storm report, Apr 17, 5:29 PM CDT, 1 hour 19 minutes before
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Local storm report, Apr 17, 5:33 PM CDT, 1 hour 15 minutes before
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Local storm report, Apr 17, 5:45 PM CDT, 1 hour 3 minutes before
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Local storm report, Apr 17, 6:06 PM CDT, 42 minutes before
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Local storm report, Apr 17, 6:27 PM CDT, 21 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 7:51 PM CDTRiver Flood WarningLOTWinnebago16 days
Apr 17, 3:43 AM CDTGale WatchLOT12 hr
Apr 17, 8:19 AM CDTSpecial Weather StatementLOTDeKalb56 min
Apr 17, 9:35 AM CDTSpecial Weather StatementLOTCook, DuPage55 min
Apr 17, 9:46 AM CDTRiver Flood WatchLOTOgle6 hr
Apr 17, 9:46 AM CDTRiver Flood WatchLOTLee6 hr
Apr 17, 9:46 AM CDTRiver Flood WatchLOTWinnebago6 hr
Apr 17, 10:07 AM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, Kane, Lee, Ogle, Winnebago53 min
Apr 17, 10:49 AM CDTRiver Flood WatchLOTKane, Kendall6 hr
Apr 17, 10:49 AM CDTRiver Flood WatchLOTLaSalle6 hr
Apr 17, 10:49 AM CDTRiver Flood WatchLOTLake6 hr
Apr 17, 10:49 AM CDTRiver Flood WatchLOTCook6 hr
Apr 17, 10:49 AM CDTRiver Flood WatchLOTCook6 hr
Apr 17, 10:49 AM CDTRiver Flood WatchLOTWill6 hr
Apr 17, 11:07 AM CDTSpecial Weather StatementLOTDeKalb, DuPage, Kane53 min
Apr 17, 11:17 AM CDTSevere Thunderstorm WarningLOTCook, DeKalb, DuPage, Kane, Lake, McHenry58 min
Apr 17, 11:29 AM CDTSpecial Marine WarningLOT91 min
Apr 17, 11:36 AM CDTSevere Thunderstorm WarningLOTDeKalb, Lee, Ogle, Winnebago54 min
Apr 17, 12:03 PM CDTFlash Flood WarningLOTCook, Kane, Lake, McHenry6 hr
Apr 17, 12:17 PM CDTRiver Flood WarningLOTLaSalle10 days
Apr 17, 12:18 PM CDTFlash Flood WarningLOTDeKalb, Lee, Ogle6 hr
Apr 17, 12:25 PM CDTRiver Flood AdvisoryLOTGrundy10 hr
Apr 17, 12:53 PM CDTSpecial Weather StatementLOTOgle, Winnebago37 min
Apr 17, 12:58 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, Lee, Ogle, Winnebago62 min
Apr 17, 1:18 PM CDTFlash Flood WarningLOTBoone, Kane, Lake, McHenry, Winnebago5 hr
Apr 17, 1:27 PM CDTSpecial Weather StatementLOTCook, DeKalb, DuPage, Kane, Lake, McHenry63 min
Apr 17, 1:44 PM CDTSevere Thunderstorm WarningLOTBoone, Cook, DeKalb, Kane, Lake, McHenry and 1 more61 min
Apr 17, 2:11 PM CDTSpecial Weather StatementLOTDeKalb, DuPage, Grundy, Kendall, LaSalle, Lee and 1 more64 min
Apr 17, 3:11 PM CDTRiver Flood WarningLOTCook61 hr
Apr 17, 3:14 PM CDTSpecial Weather StatementLOTCook, DuPage, Grundy, Kankakee, Livingston, Will31 min
Apr 17, 3:18 PM CDTRiver Flood AdvisoryLOTCook15 hr
Apr 17, 3:39 PM CDTSpecial Weather StatementLOTKendall, LaSalle66 min
Apr 17, 3:45 PM CDTSpecial Weather StatementLOTFord, Iroquois, Kankakee60 min
Apr 17, 3:58 PM CDTRiver Flood WarningLOTOgle9 days
Apr 17, 3:58 PM CDTRiver Flood WarningLOTLee6 days
Apr 17, 3:58 PM CDTRiver Flood WarningLOTWinnebago5 days
Apr 17, 4:10 PM CDTGale WatchLOT11 hr
Apr 17, 4:10 PM CDTGale WarningLOT17 hr
Apr 17, 4:20 PM CDTRiver Flood WarningLOTKane, Kendall17 days
Apr 17, 4:20 PM CDTRiver Flood WarningLOTLaSalle9 days
Apr 17, 4:20 PM CDTRiver Flood WarningLOTLake10 days
Apr 17, 4:20 PM CDTRiver Flood WarningLOTCook10 days
Apr 17, 4:20 PM CDTRiver Flood WarningLOTCook9 days
Apr 17, 4:20 PM CDTRiver Flood WarningLOTWill4 days
Apr 17, 4:35 PM CDTSpecial Marine WarningLOT40 min
Apr 17, 4:46 PM CDTFlash Flood WarningLOTCook4 hr
Apr 17, 6:12 PM CDTAreal Flood WarningLOTBoone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more18 hr
Apr 17, 3:18 PM CDTRiver Flood AdvisoryLOTLake5 hr
Apr 17, 4:35 PM CDTSevere Thunderstorm WarningLOTPorter25 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2013Every severe thunderstorm 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.