Tornadoes and Flooding in Illinois, November 17, 2013

Name: Tornadoes and Flooding in Illinois, November 17, 2013
Start: 2013-11-17T10:30
End: 2013-11-17T15:52
Location: Illinois

November 17, 2013 · NWS LOT · 55 events in 16 counties and zones

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 5
Property damage: $14 million
Crop damage: None recorded
Events: 55

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LOT wrote it up.

A major tornado outbreak impacted the Midwest and Ohio Valley on November 17th. A powerful low pressure system across the plains states steered warmth and moisture northward for nearly two days, with dew points rising into the mid 60s. This coupled with temperatures around 70 resulted in unseasonably strong instability for thunderstorms to develop. High wind shear and a cold front sweeping eastward made up the remaining ingredients of an environment favorable for supercells capable of long-lived significant tornadoes. Within the WFO LOT county warning area, ten tornadoes were confirmed, including three EF-2 tornadoes. As the event evolved, the system became linear with numerous reports of straight line wind damage. Behind the thunderstorms, a wake low developed with wind gusts to around 60 mph.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Nov 17, 10:09 AM CST, 21 minutes earlier.

Area forecast discussion, Nov 17, 10:09 AM CST, 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1009 AM CST SUN NOV 17 2013

.MESOSCALE DISCUSSION...
950 AM CST

RADAR UPDATE...

TOR ISSUED FOR NW MCHENRY COUNTY DUE TO BRIEF RAPID TIGHTENING OF
THE ROTATION ALOFT NE OF BELVIDERE ON THE 1533Z SCAN. ENVIRONMENT
REMAINS EXTREMELY CONDUCIVE FOR TORNADOES AND HAD ALREADY GOTTEN
CONFIRMED ROTATION AND WALL CLOUD WITH SPOTTER SUBMITTED PHOTO WITH
OTHER REPORTS OF FUNNELS AS WELL. ROTATION HAS SINCE WEAKENED BUT
THE THREAT FOR RAPID INTENSIFICATION OF ROTATION IN THESE STORMS
REMAINS HIGH.

905 AM CST

INITIAL STRING OF CONVECTION IS DEVELOPING ACROSS NORTH CENTRAL IL.
A MODIFIED 14Z DVN RAOB INDICATES WE ARE ALREADY UNCAPPED BASED ON
OUR MID 60S DEW POINTS...WITH SURFACE BASED CAPE 1000-1500 J/KG
ALREADY BASED ON THIS. WATER VAPOR AND VISIBLE SATELLITE CHANNELS
BOTH INDICATE MULTIPLE NORTH-TO-SOUTH CORRIDORS OF CONVERGENCE
WITHIN THE SIGNIFICANT HEIGHT FALLS WHERE CONVECTION WILL LIKELY
CONTINUE TO GRADUALLY DEVELOP...WITH AGITATED CUMULUS FROM
NORTHERN IL THROUGH CENTRAL MO.

INITIAL CELLS HAVE ALREADY SHOWN ROTATION WHICH IS NOT SURPRISING
CONSIDERING THE IMPRESSIVE 35-45 KT OF 0-1KM SHEAR AND 60KT+ OF
DEEP LAYER SHEAR. WHILE THE LOW-LEVEL SHEAR WILL EASE SOME AS THE
LOW-LEVEL WIND MAXIMA MOVES NORTHEAST...IT WILL REMAIN PLENTY HIGH
AND WELL ABOVE WHAT RESEARCH HAS SHOWN WHAT IS NEEDED FOR
SIGNIFICANT TORNADOES. CONVECTIVE MODE INITIALLY MAY BE THESE
STRINGS OF QUICK MOVING NORTHEAST CELLS...BUT IT IS STILL
ANTICIPATED THAT INDIVIDUAL DISCRETE CELLS WITHIN THIS...OR JUST
ON THEN OWN...WILL BE THE MAIN MODE FROM LATE MORNING THROUGH
EARLY AFTERNOON ACROSS MUCH OF THE FORECAST AREA. CONVECTIVE
ALLOWING MODELS CONTINUE TO SHOW THIS TREND AND THE LATEST ONES
ARE FOR THE MOST PART IN VERY GOOD AGREEMENT. THE MAIN TIME FOR
CHICAGOLAND CONTINUES TO LOOK TO BE WITHIN 11AM-3PM.

DEVELOPMENT OF STRONG UPDRAFTS WITHIN CONVECTION CAN BE VERY QUICK
IN THIS HIGHLY DYNAMIC ENVIRONMENT...WITH SHEAR ON RADAR
CORRELATING TO TORNADO DEVELOPMENT IN SHORT TIME. THIS IS EVEN
MORE REASON TO MAINTAIN A HIGH AWARENESS.

PDS TORNADO WATCH IS IN EFFECT UNTIL 400 PM FOR THE ENTIRE AREA.

MTF

&&

.DISCUSSION...
304 AM CST

HIGH SEVERE WEATHER POTENTIAL ACROSS MUCH OF THE AREA TODAY WITH
TORNADOES AND DAMAGING STRAIGHT LINE WINDS A SIGNIFICANT THREAT.

SYNOPSIS...NEAR TERM FOCUS CONTINUES TO BE SEVERE WEATHER THREAT AS
A MAJOR FALL STORM SYSTEM TAKES SHAPE AND MOVES ACROSS THE REGION.
WATER VAPOR IMAGERY SHOWS A BROAD UPPER TROUGH PIVOTING ACROSS THE
MID SECTION OF THE COUNTRY WITH EVENING UPPER AIR ANALYSIS SHOWING A
150 KT UPPER JET DIGGING DOWN ITS WESTERN FLANK. AT THE SAME TIME A
SUB TROPICAL JET OF AROUND 120 KT IS STRETCHED FROM OKLAHOMA UP THE
OHIO VALLEY. SEVERAL SHORTWAVES ARE EMBEDDED IN THE SOUTHWESTERLY
FLOW AHEAD OF THE TROUGH WI ONE WAVE CROSSING NORTHWEST ILLINOIS
EARLY THIS MORNING AND A HINT OF ANOTHER ACROSS EASTERN KANSAS. AT
THE SURFACE...ONE AREA OF LOW PRESSURE IS STRETCHED FROM NORTHERN
MINNESOTA ACROSS LAKE SUPERIOR WITH ANOTHER LOW MOVING NORTHEAST
FROM CENTRAL KANSAS. SYNOPTICALLY...THE UPPER TROUGH WILL AMPLIFY AS
THE UPPER JET ROUNDS THE BASE WITH IT TAKING ON A NEGATIVE TILT AS
IT PIVOTS ACROSS THE LOCAL AREA THROUGH THE AFTERNOON. THIS WILL
CAUSE THE SURFACE LOW OVER KANSAS TO CONTINUE NORTHEAST REACHING
SOUTHERN WISCONSIN BY EARLY AFTERNOON. THE LOW WILL THEN DEEPEN AS
THE UPPER TROUGH AMPLIFIES AND CATCHES UP WITH IT ACROSS NORTHERN
LAKE MICHIGAN LATE THIS AFTERNOON. A COLD FRONTAL BOUNDARY WILL
CROSS THE AREA DURING THE AFTERNOON.

DETAILS FOR TODAY...CONVECTION CONTINUES TO WORK NORTHWARD ACROSS
THE NORTHWEST HALF OR SO OF THE AREA EARLY THIS MORNING IN
CONJUNCTION WITH THE AFOREMENTIONED SHORTWAVE. THIS WAVE IS
COINCIDENT WITH A TIGHTENING LOW/MID LEVEL BAROCLINIC ZONE/WARM
FRONT THAT IS LIFTING NORTHWARD. STEADY ASCENT WILL CONTINUE OVER
THIS BOUNDARY WHICH WILL PROGRESS NORTHWARD THROUGH DAYBREAK KEEPING
AT LEAST SCATTERED CONVECTIVE DEVELOPMENT POSSIBLE ACROSS THE
NORTHERN CWA BEFORE LIFTING NORTH. HAVE NOT SEEN MUCH IN THE WAY OF
WIND GUSTS WITH THE PRECIP THUS FAR WITH INTENSITY HAVING WANED INTO
THE OVERNIGHT HOURS...BUT SOME PULSEY CORES ARE POSSIBLE WITH SOME
SMALL HAIL. SATELLITE IMAGERY SHOWS A FAIR AMOUNT OF SCT-BKN SKIES
UPSTREAM OF THE AREA WITH A MORE WIDESPREAD AREA OF CLOUDS WORKING
NORTHWARD TO THE WEST OF THE CWA. SUSPECT THAT THERE WILL BE BREAKS
IN THE CLOUDS ACROSS PORTIONS OF THE CWA THIS MORNING.

ATTENTION TURNS TO SEVERE POTENTIAL THROUGH THE REST OF THE DAY AS
THE ABOVE SYNOPTIC EVOLUTION COMMENCES. BOTH DYNAMIC AND
THERMODYNAMIC ASPECTS OF THE SYSTEM ARE IMPRESSIVE AND WILL COME
TOGETHER TO PRODUCE AN OUTBREAK OF SEVERE WEATHER ACROSS THE REGION.
THE MAIN QUESTION FOR THE LOCAL AREA WILL BE THE AMOUNT OF COVERAGE
AS THE SYSTEM WORKS THROUGH INTO THE LATE AFTERNOON. THE WESTERN
UPPER JET WILL ROUND THE BASE OF THE TROUGH AND NOSE INTO THE AREA
FROM THE SOUTHWEST DURING THE LATE MORNING AND EARLY AFTERNOON. THIS
JET WILL ALSO COUPLE WITH THE SUB-TROPICAL JET ALREADY IN PLACE
ACROSS THE OHIO VALLEY. IN ADDITION...A 85-90 KT MID LEVEL SPEED MAX
WILL NOSE IN UNDERNEATH THE UPPER JET DURING THIS TIME AS WELL. THE
COMBINATION OF THESE FEATURES AND THE DEEPENING SURFACE TROUGH WILL
PROVIDE DEEP LAYER SHEAR VALUES OF 55-60 KT ACROSS MUCH OF THE AREA
BY MIDDAY...WITH AN INCREASE TO NEAR 70 KT ACROSS THE SOUTHEASTERN
CWA THIS AFTERNOON...WITH 0-1KM SHEAR VALUES OF AROUND 40 KT.
UNSEASONABLY STRONG INSTABILITY WILL DEVELOP AS DEW POINTS RISE INTO
THE LOWER 60S WITH CAPE VALUES OF AROUND 1000 J/KG. FORECAST
SOUNDINGS SHOW HIGH VALUES OF LOW LEVEL CAPE WITH 150 TO EVEN 200
J/KG IN THE LOWEST 3 KM. ALL OF THIS RESULTS IN IMPRESSIVE VALUES
FOR VARIOUS SEVERE WEATHER PARAMETERS. BASED ON ALL OF THIS EXPECT
THAT STORMS WILL INITIATE BY LATE MORNING OVER OR JUST SOUTHWEST/WEST OF
THE SOUTHWEST CWA AS THE ABOVE SYNOPTIC FEATURES ADVANCE NORTHEAST.
COVERAGE OF STORMS LOOKS TO TAKE OFF EARLY THIS AFTERNOON AS THE
COUPLING OF THE MID/UPPER JETS MAXIMIZES AND CONTINUES THROUGH THE
AFTERNOON. THE SEVERE THREAT WILL MARKEDLY INCREASE AS THIS OCCURS
AS WELL. THE RATE AT WHICH COVERAGE INCREASES IS STILL SOMEWHAT
UNCERTAIN...AT LEAST THROUGH MIDDAY...WITH IT POSSIBLE THAT A FEW
STORMS DEVELOP INITIALLY WITH A MORE RAPID INCREASE HOLDING OFF
UNTIL EARLY AFTERNOON WITH THE ARRIVAL OF BETTER FORCING. THE MYRIAD
OF AVAILABLE CONVECTIVE ALLOWING GUIDANCE RUNS THE GAMUT OF COVERAGE
SCENARIOS. THE LATEST SPC DAY 1 OUTLOOK LINES UP WELL WITH LOCAL
THINKING PLACING THE HIGHEST RISK FROM BASICALLY CHICAGO SOUTH TO
FORD COUNTY AND POINTS EAST. THIS AREA WILL LINE UP WELL WITH THE
BEST FORCING PARAMETERS AND TIMING OF INCREASING COVERAGE THIS
AFTERNOON. THE REMAINDER OF THE CWA TO THE WEST INCLUDING THE
ROCKFORD AREA IS IN A MODERATE RISK AND MAY BE MORE IN LINE WITH THE
INITIAL DEVELOPMENT. AS FAR AS THREATS...THE STRONG SHEAR AND
INSTABILITY WILL POINT TO DISCRETE SUPERCELL DEVELOPMENT WITH AN
EVENTUAL EVOLUTION INTO A SQUALL LINE LATER TODAY. IT IS POSSIBLE
THAT MUCH OF THE ACTIVITY REMAINS FAIRLY DISCRETE ACROSS THE CWA
WITH EVOLUTION INTO A PREDOMINATELY LINEAR STRUCTURE TAKING PLACE
OVER OR JUST EAST OF THE EASTERN CWA. GIVEN THE STRONG LOW LEVEL
SHEAR AND INSTABILITY...TORNADOES ARE A DEFINITE THREAT ALONG WITH
DAMAGING WINDS FOLLOWED BY LARGE HAIL. THE STRONG SHEAR AND
POTENTIAL FOR MAINTENANCE OF DISCRETE CELLS SUGGEST THE POTENTIAL
FOR STRONGER AND LONGER TRACKED TORNADOES SHOULD THEY OCCUR.

THE OTHER HIGHLIGHT IS THE SYNOPTIC NON-THUNDERSTORM WINDS.
SOUTHERLY SPEEDS WILL INCREASE THROUGH THE MORNING...ESPECIALLY IF
ANY MEANINGFUL CLEARING CAN OCCUR AS PRESSURE FALLS INCREASE AHEAD
OF THE LOW. THE BIGGEST CONCERN HOWEVER IS WINDS BEHIND THE COLD
FRONT WHICH WILL CROSS THE AREA LATER THIS AFTERNOON. THE STRONG
GRADIENT AND ASSOCIATED PRESSURE RISES ARE EXPECTED TO ALLOW FOR
STRONG MIXING AND GENERATION OF WIND GUSTS THAT COULD TOP 50 KT
ACROSS MUCH OF THE CWA...ESPECIALLY FROM THE NORTHERN CHICAGO
SUBURBS BACK TOWARDS THE MENDOTA AREA AND POINTS SOUTH. HAVE
UPGRADED THIS PORTION OF THE WIND ADVISORY TO A HIGH WIND WARNING
THIS AFTERNOON STARTING TOWARD MIDDAY...WITH THE HIGHEST
WINDS...OUTSIDE OF STORMS...THIS AFTERNOON.

MDB

TONIGHT THROUGH SATURDAY...

LOW PRESSURE WILL QUICKLY BE LIFTING ACROSS THE NORTHERN LAKES
THIS EVENING AND INTO WESTERN QUEBEC MONDAY MORNING...WHILE STILL
DEEPENING WHILE HIGH PRESSURE STRENGTHENS ACROSS THE PLAINS
TONIGHT AND CONTINUES TO STRENGTHEN AS IT MOVES ACROSS THE OHIO
VALLEY AND SOUTHERN LAKES REGION MONDAY NIGHT. THE STRONGEST
WINDS/GUSTS SHOULD DIMINISH QUICKLY EARLY THIS EVENING BUT IT WILL
REMAIN WINDY THROUGH THE EARLY MORNING HOURS...GRADUALLY
DIMINISHING OVERNIGHT. WRAP AROUND SHOWERS WILL BE POSSIBLE FOR A
FEW HOURS THIS EVENING...MAINLY ACROSS FAR NORTHERN IL...THEN
SHOULD SEE CLEARING SKIES. MUCH COLDER AIR WILL SPREAD ACROSS THE
REGION WITH LOWS IN THE MID/UPPER 30S BUT COMBINED WITH THE GUSTY
WESTERLY WINDS...WIND CHILLS WILL RANGE FROM THE MID 20S TO AROUND
30 RANGE BY MORNING.

MONDAY WILL REMAIN BREEZY WITH HIGHS IN THE LOWER/MID 40S WITH
MAINLY SUNNY SKIES. WINDS SHOULD STEADILY DIMINISH FROM MID
AFTERNOON THROUGH SUNSET AS THE HIGH CONTINUES TO BUILD EAST.
LIGHT WINDS AND GENERALLY CLEAR SKIES SHOULD ALLOW FOR A FAST TEMP
DROP MONDAY EVENING WITH THE USUAL COLD SPOTS PERHAPS AS LOW AS
THE LOWER 20S...BUT WITH WEAK WARM AIR ADVECTION OVERNIGHT...TEMPS
MAY LEVEL OFF AT SOME POINT. SOUTHERLY FLOW RETURNS TUESDAY AND
WITH MOSTLY SUNNY SKIES EXPECTED...HIGHS INTO THE UPPER 40S LOOK
REASONABLE WITH GUIDANCE SUGGESTING LOWER 50S COULD BE REACHED
THUS TEMPS COULD BE SLIGHTLY WARMER.

RETURN MOISTURE COMBINED WITH WEAK WAVES LIFTING ACROSS THE AREA
NOW APPEAR SUFFICIENT TO PRODUCE SOME SHOWERS WEDNESDAY INTO
WEDNESDAY NIGHT. THE MODELS ARE IN MUCH BETTER AGREEMENT WITH
THIS SOLUTION BUT STILL SOME TIMING DIFFERENCES AS THE ECMWF HOLDS
OFF PRECIP UNTIL WEDNESDAY NIGHT FOR MUCH OF THE AREA AND A SLOWER
TIMING COULD MEAN WARMER TEMPS ON WEDNESDAY. A COLD FRONT THEN
SAGS SOUTH INTO THE AREA THURSDAY AHEAD OF ANOTHER VERY STRONG
HIGH BUILDING SOUTH INTO THE NORTHERN PLAINS. AS THE UPPER TROUGH
DIGS ACROSS THE LAKES REGION...ANOTHER WAVE MOVES EAST/NORTHEAST
ACROSS THE SOUTHERN LAKES AND OHIO VALLEY. TIMING OF COLDER AIR
ALONG WITH END TIME OF PRECIP ALL REMAIN UNCERTAIN FROM THIS
DISTANCE. CURRENT TRENDS WOULD SUGGEST A COLD RAIN WITH A BRIEF
MIX BEFORE ENDING. HOWEVER...GIVEN THE DIFFERENCES...ITS DIFFICULT
TO LOWER OR RAISE POPS FOR VARIOUS TIME PERIODS. THUS HAVE CHANCE
POPS FOR THE ENTIRE WEDNESDAY NIGHT THROUGH FRIDAY NIGHT TIME
PERIOD AND THERE WILL LIKELY BE PERIODS OF NO PRECIP DURING THIS
TIME. CMS

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 16Z...

* SOUTH SOUTHWEST WINDS 20-31 KT INCREASING TO 22-35 KT EARLY
  AFTERNOON. THEN SOUTHWEST WINDS 30-50 KT MID AFTERNOON THROUGH
  EARLY EVENING. WEST WINDS 20-35 KT OVERNIGHT.

* ISOLATED SHOWERS LATE THIS MORNING. A PERIOD OF STRONG TO SEVERE
  THUNDERSTORMS POSSIBLE MID DAY TO MID AFTERNOON.

* MVFR CIGS THROUGH MID AFTERNOON. BRIEFLY IFR CIG/VSBY IN HEAVIER
  SHOWERS AND THUNDERSTORMS.

RODRIGUEZ

//DISCUSSION...UPDATED 12Z...

...HIGH WINDS ESPECIALLY MID AFTERNOON TO EARLY EVENING...
...MDT TO HIGH RISK OF SEVERE STORMS LATE MORNING-MID AFTERNOON...

SYNOPSIS AND THUNDERSTORM THREAT...NOT A GOOD DAY FOR FLYING. LOW
PRESSURE NEAR THE IA/MO BORDER THIS MORNING WILL INTENSIFY AS IT
MOVES INTO SOUTH CENTRAL WISCONSIN BY MIDDAY...WITH A STRONG COLD
FRONT SURGING EAST ACROSS NORTHERN IL. THE LOW WILL THEN RAPIDLY
DEEPEN LATE THIS AFTERNOON AND EARLY THIS EVENING AS IT MOVES
ACROSS NORTHERN LAKE MICHIGAN AND THE COLD FRONT SWEEPS INTO
INDIANA. UNSEASONABLY MILD AND HUMID AIR IS SURGING NORTH AHEAD OF
THE LOW...PRODUCING AREAS OF SHOWERS AND A FEW THUNDERSTORMS THIS
MORNING. AS THE LOW INTENSIFIES AND THE ATMOSPHERE
DESTABILIZES...MORE ORGANIZED THUNDERSTORM CLUSTERS WILL DEVELOP
AHEAD OF THE COLD FRONT OVER CENTRAL ILLINOIS AND MOVE RAPIDLY
NORTHEAST. SOME OF THE STORMS WILL PRODUCE DAMAGING WINDS AND EVEN
TORNADOES. THUNDERSTORMS WILL END WITH THE PASSAGE OF THE STRONG
COLD FRONT.

WINDS...SOUTH WINDS ARE IN A LULL EARLY THIS MORNING BUT WILL
RAMP UP TO 20 TO 30 KTS BY LATE MORNING. BEHIND THE COLD FRONT
VERY STRONG PRESSURE RISES WILL PRODUCED SUSTAINED SOUTHWEST WINDS
25 TO 30 KT WITH GUSTS TO AROUND 50 KT. THE STRONGEST WINDS WILL
BE MID AFTERNOON THROUGH EARLY EVENING. WINDS WILL TURN WEST AND
GRADUALLY DIMINISH OVERNIGHT.

CIG/VSBY...LOOKING AT SURFACE OBS AROUND THE AREA THIS
MORNING...CIGS ARE GENERALLY 1000-2000 FT BUT WILL DROP BRIEFLY TO
IFR ESPECIALLY IN HEAVIER SHOWERS AND THUNDERSTORMS. CIG/VSBY WILL
IMPROVE RAPIDLY AFTER THE COLD FRONTAL PASSAGE THIS EVENING...AND
SKIES WILL CLEAR OVERNIGHT.

ALLSOPP

//ORD AND MDW CONFIDENCE...UPDATED 16Z...

* MEDIUM TO HIGH CONFIDENCE IN WIND FORECAST.

* MEDIUM CONFIDENCE IN CIG/VSBY TRENDS.

* MEDIUM HIGH CONFIDENCE IN TIMING OF PERIOD OF STRONG STORMS.

RODRIGUEZ

//OUTLOOK FOR ORD/MDW FOR 00Z TUESDAY-12Z SUNDAY...UPDATED 12Z...

MONDAY NIGHT...VFR. STRONG WEST WINDS.

TUESDAY...VFR.

WEDNESDAY AND THURSDAY...CHC SHRA. MVFR POSSIBLE.

FRIDAY...CHC RASN. MVFR LIKELY. IFR POSSIBLE.

SATURDAY...VFR.

ALLSOPP

&&

.MARINE...
142 AM CST

...STORM WARNING ISSUED FOR SOUTH 2/3 OF LAKE MI LATE AFTERNOON
AND TONIGHT...
POWERHOUSE STORM WILL INTENSIFY RAPIDLY THIS AFTERNOON AND
TONIGHT AS IT MOVES FROM NORTHERN ILLINOIS TO SOUTHERN ONTARIO.
THERE WILL BE A BIT OF A LULL IN THE WINDS THIS MORNING...AND
WINDS WILL BE JUST BELOW GALE FORCE FOR A BIT BUT WILL MAINTAIN
THE GALE THROUGH MID AFTERNOON. AS THE LOW PRESSURE MOVES ACROSS
THE NORTH END OF THE LAKE THIS AFTERNOON A STRONG COLD FRONT WILL
SWEEP RAPIDLY ACROSS THE LAKE. A LARGE PRESSURE FALL/RISE COUPLET
WILL MOVE ACROSS NORTHERN IL THIS AFTERNOON AND OVER CENTRAL AND
SOUTHERN LAKE MICHIGAN THIS EVENING. EXPECT WINDS TO INTENSIFY
LATE AFTERNOON AND EVENING WITH GUSTS OF 50 TO 60 KTS. NORTH PART
OF THE LAKE MAY SEE SOME NEAR STORM FORCE GUSTS LATE EVENING
THROUGH THE OVERNIGHT HOURS...BUT NOT AS STRONG AS THE SOUTH AND
CENTRAL. SO HAVE MAINTAINED THE GALE FOR THE NORTH. GALES WILL
THEN CONTINUE OVER THE ENTIRE LAKE THROUGH MONDAY AFTERNOON.

FOR THE NEARSHORE...WINDS WILL RAMP UP TO STORM FORCE GUSTS BY
LATE AFTERNOON BUT DROP BACK TO GALES THIS EVENING...SO A SHORTER
PERIOD OF POTENTIAL STORM FORCE WINDS NEARSHORE.

HIGH PRESSURE WILL THEN SETTLE INTO THE AREA FOR MONDAY NIGHT AND
TUESDAY.

ALLSOPP

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...HIGH WIND WARNING...ILZ013-ILZ014-ILZ019-ILZ020-ILZ021-ILZ022-
     ILZ023-ILZ032-ILZ033-ILZ039 UNTIL 8 PM SUNDAY.

     WIND ADVISORY...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-
     ILZ012 UNTIL 8 PM SUNDAY.

IN...HIGH WIND WARNING...INZ001-INZ002-INZ010-INZ011-INZ019 UNTIL 8
     PM SUNDAY.

LM...GALE WARNING...LMZ080-LMZ366-LMZ565-LMZ567-LMZ669-LMZ671-LMZ673-
     LMZ675-LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-
     LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-LMZ878 UNTIL 2 PM
     SUNDAY.

     GALE WARNING...LMZ080-LMZ366-LMZ565-LMZ567-LMZ669-LMZ671-LMZ673-
     LMZ675-LMZ777-LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-
     LMZ878...4 AM MONDAY TO 3 PM MONDAY.

     STORM WARNING...LMZ080-LMZ366-LMZ565-LMZ567-LMZ669-LMZ671-LMZ673-
     LMZ675-LMZ777-LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-
     LMZ878...2 PM SUNDAY TO 4 AM MONDAY.

     GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ563 UNTIL 3 PM MONDAY.

     GALE WARNING...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-LMZ745...8 PM
     SUNDAY TO 4 AM MONDAY.

     STORM WARNING...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-LMZ745...2 PM
     SUNDAY TO 8 PM SUNDAY.

&&

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
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Hazardous weather outlook, Nov 17, 8:50 AM CST, 1 hour 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
850 AM CST SUN NOV 17 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
181500-
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-
850 AM CST SUN NOV 17 2013 /950 AM EST SUN NOV 17 2013/

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

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...WHICH WILL PRODUCE...
   DAMAGING WIND GUSTS IN EXCESS OF 75 MPH.
   TORNADOES...POSSIBLY STRONG...DAMAGING AND LONG TRACKED.
   HAIL TO THE SIZE OF QUARTERS.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS MORNING AND AFFECT
  THE ENTIRE OUTLOOK AREA THROUGH MID AFTERNOON.

  DISCUSSION:

A POWERFUL STORM SYSTEM WILL MOVE ACROSS THE WESTERN GREAT LAKES
REGION THIS AFTERNOON WITH A STRONG TRAILING COLD FRONT SWEEPING
ACROSS THE AREA THIS AFTERNOON. SEVERE THUNDERSTORMS ARE EXPECTED
TO DEVELOP AHEAD OF THIS FRONT AND RACE EAST ACROSS THE AREA. THE
PRIMARY SEVERE WEATHER THREATS WILL BE DAMAGING WINDS AND THE
POTENTIAL FOR STRONG...VERY DAMAGING...AND LONG LIVED TORNADOES.

VERY WINDY CONDITIONS WILL DEVELOP THIS MORNING AND CONTINUE INTO
THIS EVENING...OUTSIDE OF THUNDERSTORMS...WITH WIND GUSTS
EXPECTED TO REACH 55 TO 60 MPH GENERALLY SOUTH OF AN EVANSTON TO
MENDOTA LINE...WITH WIND GUSTS OF 50 TO 55 MPH NORTH OF THIS LINE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS WILL BE NEEDED THROUGH MID TO LATE AFTERNOON.

&&

LMZ740>745-181500-
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-
850 AM CST SUN NOV 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...TODAY AND TONIGHT.

THUNDERSTORMS ARE EXPECTED THROUGH LATE THIS AFTERNOON...SOME
MAY BE SEVERE.

GALE FORCE WINDS WILL DEVELOP LATE THIS MORNING THEN INCREASE TO
STORM FORCE MID TO LATE AFTERNOON...DIMINISHING BACK TO GALES
THIS EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

STRONG WINDS AND HIGH WAVES HAZARDOUS TO SMALL CRAFT WILL
CONTINUE THROUGH MONDAY EVENING.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-181500-
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-
850 AM CST SUN NOV 17 2013

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

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE EXPECTED THROUGH LATE THIS AFTERNOON...SOME
MAY BE SEVERE...MAINLY ACROSS THE SOUTHERN TWO THIRDS OF THE
LAKE.

GALE FORCE WINDS WILL DEVELOP LATE THIS MORNING INTO EARLY THIS
AFTERNOON ACROSS THE ENTIRE LAKE...THEN INCREASE TO STORM FORCE
MID TO LATE AFTERNOON OVER THE SOUTHERN THREE QUARTERS OF THE
LAKE. STORM FORCE WINDS WILL CONTINUE THROUGH LATE TONIGHT...
DIMINISHING BACK TO GALE FORCE WINDS OVERNIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

GALE FORCE WINDS WILL CONTINUE THROUGH MONDAY AFTERNOON.

&&

IZZI

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

Special weather statement, Nov 17, 5:00 AM CST, 5 hours 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
500 AM CST SUN NOV 17 2013

ILZ005-006-012-014-171115-
COOK IL-KANE IL-LAKE IL-MCHENRY IL-
500 AM CST SUN NOV 17 2013

...SPECIAL WEATHER STATEMENT...

AT 457 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR ALGONQUIN...MOVING NORTHEAST AT 55 MPH.

NICKEL SIZE HAIL IS POSSIBLE WITH THIS STORM.

CITIES AND TOWNS AFFECTED...
  ALGONQUIN...          CARPENTERSVILLE...    WEST DUNDEE...
  LAKE IN THE HILLS...  SLEEPY HOLLOW...      OAKWOOD HILLS...
  TOWER LAKES...        LAKE ZURICH...        ISLAND LAKE...

OTHER LOCATIONS AFFECTED...
COLLEGE OF LAKE COUNTY...LAKE COUNTY IL FAIRGROUNDS...SIX FLAGS GREAT
AMERICA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

&&

LAT...LON 4243 8798 4226 8782 4208 8833 4217 8841
TIME...MOT...LOC 1100Z 236DEG 49KT 4214 8831

CMS

Special weather statement, Nov 17, 6:02 AM CST, 4 hours 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
602 AM CST SUN NOV 17 2013

ILZ013-014-022-023-INZ001-171230-
COOK IL-DUPAGE IL-KANKAKEE IL-LAKE IN-WILL IL-
602 AM CST SUN NOV 17 2013

...SPECIAL WEATHER STATEMENT...

AT 558 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LOCKPORT TO
PEOTONE...MOVING NORTHEAST AT 60 MPH.

UP TO PENNY SIZE HAIL...OCCASIONAL CLOUD TO GROUND LIGHTNING...ARE
POSSIBLE WITH THESE STORMS.

CITIES AND TOWNS AFFECTED...
  LOCKPORT...           NEW LENOX...          PEOTONE...
  INGALLS PARK...       LEMONT...             UNIVERSITY PARK...
  RICHTON PARK...       MONEE...              MOKENA...

OTHER LOCATIONS AFFECTED...
FIRST MIDWEST BANK AMPHITHEATRE...GOVERNORS STATE UNIVERSITY...
HAWTHORNE PARK...ILLIANA MOTOR SPEEDWAY...INDIANA UNIVERSITY
NORTHWEST...JOLIET SLAMMERS BASEBALL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES.  SEEK SHELTER IN
A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

&&

LAT...LON 4124 8773 4157 8815 4195 8763 4191 8762
      4190 8760 4184 8760 4177 8756 4175 8753
      4170 8751 4168 8745 4169 8742 4167 8741
      4165 8742 4163 8733 4162 8722 4137 8722
TIME...MOT...LOC 1202Z 228DEG 51KT 4161 8798 4134 8768

MDB

Local storm report, Nov 17, 10:03 AM CST, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1003 AM CST SUN NOV 17 2013

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

0950 AM     FUNNEL CLOUD     3 W HEBRON              42.47N 88.49W
11/17/2013                   MCHENRY            IL   TRAINED SPOTTER

&&

BN

Local storm report, Nov 17, 10:30 AM CST, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1030 AM CST SUN NOV 17 2013

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

1008 AM     TSTM WND GST     HARVARD                 42.42N 88.62W
11/17/2013  M54 MPH          MCHENRY            IL   TRAINED SPOTTER

&&

BN

The radar

The Milwaukee radar (KMKX), 72 km away, was scanning. The volume nearest the first event began at 16:30 UTC.

Open the radar archive at this moment

Event by event

27 thunderstorm wind, 14 hail, 10 tornado, 2 flood, 2 high wind. Local standard time, as filed.

Hail, Winnebago

When: November 17, 10:30 AM CST to 10:32 AM CST
Where: Winnebago County, Roscoe
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.420, -89.020

Hail, La Salle

When: November 17, 10:41 AM CST to 10:47 AM CST
Where: La Salle County, 0.86 mi NE of La Salle
Measured: 1 in hail
Reported by: CoCoRaHS
Coordinates: 41.340, -89.090

Penny to quarter size hail was reported in La Salle.

Thunderstorm Wind, La Salle

When: November 17, 10:55 AM CST
Where: La Salle County, 1.66 mi NW of Peru
Measured: 50 kt (58 mph) measured gust
Reported by: AWOS
Coordinates: 41.347, -89.152

Hail, Ogle

When: November 17, 11:09 AM CST to 11:11 AM CST
Where: Ogle County, Stillman Vly
Measured: 1.25 in hail
Reported by: Trained Spotter
Coordinates: 42.100, -89.180

Hail, La Salle

When: November 17, 11:11 AM CST to 11:13 AM CST
Where: La Salle County, Oglesby
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 41.300, -89.070

Hail, Ogle

When: November 17, 11:20 AM CST to 11:23 AM CST
Where: Ogle County, 2.07 mi N of Davis Jct
Measured: 1.75 in hail
Reported by: Trained Spotter
Coordinates: 42.130, -89.100

Quarter to golfball size hail was reported.

Thunderstorm Wind, Kendall

When: November 17, 11:20 AM CST
Where: Kendall County, 1.94 mi NNW of Bristol Station
Measured: 61 kt (70 mph) measured gust
Reported by: Public
Coordinates: 41.705, -88.446

Thunderstorm Wind, Kane

When: November 17, 11:28 AM CST
Where: Kane County, 2.03 mi SW of Montgomery
Measured: 52 kt (60 mph) estimated gust
Reported by: Social Media
Coordinates: 41.712, -88.381

Winds to 60 mph were estimated near the intersection of Orchard Road and Galena Road.

Thunderstorm Wind, Du Page

When: November 17, 11:29 AM CST
Where: Du Page County, 1.38 mi N of (Dpa)dupage Co Arpt
Measured: 54 kt (62 mph) measured gust
Reported by: ASOS
Coordinates: 41.920, -88.250

Tornado, La Salle

When: November 17, 11:33 AM CST to 11:41 AM CST
Where: La Salle County, 3.8 mi S of Rutland to 2.1 mi NNE of Dana
Rating: EF2
Path length: 6.53 mi
Path width: 200 yd
Continued into: Livingston, Il (LOT)
Property damage: $150,000
Reported by: NWS Storm Survey
Coordinates: 40.926, -89.036

This is a continuation of a tornado that began in Tazewell County (NWS Central Illinois) and tracked across Woodford County, entering NWS Chicago county warning area in La Salle County, and finally ending in Livingston County. The tornado entered La Salle County approximately half a mile east of State Route 251 north of Minonk where several power poles were snapped at the base along County Line Road. On E 7th Road, a home had large portions of the roof removed. Small outbuildings were completely destroyed. More power poles were snapped on E 8th Road and again on N 2nd Road near the intersection of E 10th Road. A machinery shed was completely destroyed on N 2nd Road about half a mile west of Dana. On E 11th Road just north of Dana, an addition to a home was completely leveled with several outbuildings destroyed. This tornado entered Livingston County just northeast of Dana around 11:41 AM CST. Maximum wind speeds were estimated to be up to 135 mph.

Thunderstorm Wind, Du Page

When: November 17, 11:37 AM CST to 11:39 AM CST
Where: Du Page County, 0.51 mi W of Cloverdale to Roselle
Measured: 61 kt (70 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.930, -88.130

Winds were estimated between 65 mph and 70 mph.

Hail, Winnebago

When: November 17, 11:38 AM CST to 11:40 AM CST
Where: Winnebago County, 1.79 mi ENE of Cherry Vly
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.240, -88.918

Tornado, Livingston

When: November 17, 11:41 AM CST to 11:47 AM CST
Where: Livingston County, 3.1 mi WSW of Long Pt to 1.93 mi ENE of Long Pt
Rating: EF2
Path length: 4.97 mi
Path width: 200 yd
Property damage: $75,000
Reported by: NWS Storm Survey
Coordinates: 40.977, -88.931

This is a continuation of a tornado that began in Tazewell County (NWS Central Illinois) and tracked across Woodford County, entering NWS Chicago county warning area in La Salle County, and finally ending in Livingston County. The tornado entered Livingston County about a third of a mile north of E 2400 N Road where power poles were leaning. Several outbuildings were heavily damaged or destroyed on E 2475 N Road. Hardwood trees were snapped on N 200 E Road as well as wooden power poles. A large shed housing a fire engine was completely destroyed with the fire engine rolled onto its side on Long Point Blacktop Road near the intersection of N 400 E Road. On the northeast side of that intersection, a wooded area saw extensive tree damage with numerous trees sheared off about 20 to 30 feet from their bases. The damage path ended about half a mile north of Long Point Blacktop Road between N 450 E Road and Route 23. Maximum wind speeds were estimated to be up to 135 mph.

Tornado, Livingston

When: November 17, 11:43 AM CST to 11:46 AM CST
Where: Livingston County, 3.7 mi SW of Long Pt to 1.4 mi S of Long Pt
Rating: EF0
Path length: 2.6 mi
Path width: 50 yd
Reported by: Storm Chaser
Coordinates: 40.959, -88.925

Video was received from a storm chaser showing a satellite tornado that formed just south of the long tracked tornado that moved across Livingston County. This tornado only lasted a few minutes and appeared to stay over open fields with no damage evident. Maximum wind speeds were estimated to be up to 75 mph.

Thunderstorm Wind, Du Page

When: November 17, 11:46 AM CST
Where: Du Page County, 1.33 mi NW of Lisle
Measured: 50 kt (58 mph) measured gust
Reported by: Public
Coordinates: 41.816, -88.094

Thunderstorm Wind, Cook

When: November 17, 11:56 AM CST
Where: Cook County, 1.43 mi SE of North Northfield to Northbrook
Measured: 61 kt (70 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.117, -87.859

There were two reports of winds estimated to 70 mph near Northbrook. Tree tops were bent horizontally.

Hail, Cook

When: November 17, 12:00 PM CST
Where: Cook County, Morton Grove
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 42.030, -87.770

Hail, Du Page

When: November 17, 12:05 PM CST
Where: Du Page County, 1.51 mi S of Belmont
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.758, -88.075

Nickel size hail was reported at Hobson Road and Greene Road.

Hail, Du Page

When: November 17, 12:11 PM CST
Where: Du Page County, Villa Park
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 41.880, -87.980

Thunderstorm Wind, La Salle

When: November 17, 12:20 PM CST
Where: La Salle County, 1.14 mi ENE of Ransom
Measured: 60 kt (69 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.156, -88.650

Tops of trees were blown down. Sheet metal was damaged at a construction site.

Tornado, Grundy

When: November 17, 12:22 PM CST to 12:26 PM CST
Where: Grundy County, 1.31 mi WNW of Central City to 0.39 mi NNE of Diamond
Rating: EF2
Path length: 4.42 mi
Path width: 200 yd
Continued into: Will, Il (LOT)
Injuries: 5 direct, 0 indirect
Property damage: $11 million
Reported by: NWS Storm Survey
Coordinates: 41.237, -88.303

The tornado formed just northwest of the intersection of E Braceville Road and S Carbon Hill Road where several softwood trees were uprooted. The tornado moved northeast just north of E Reed Road where a single family residence sustained visible damage to its exterior while a metal outbuilding sustained roof and exterior wall damage. A single family home sustained considerable damage near the intersection of Berta Road and Spring Road where two people were injured. The tornado continued into a subdivision north of Spring Road where widespread minor damage occurred to several dozen homes. Several homes received more substantial damage though, including partial loss of roofs and second story walls. The tornado continued into Will County around 12:26 PM CST. Maximum wind speeds were estimated to be up to 125 mph.

Hail, Grundy

When: November 17, 12:25 PM CST to 12:27 PM CST
Where: Grundy County, 2.76 mi S of Divine
Measured: 1 in hail
Reported by: CoCoRaHS
Coordinates: 41.340, -88.300

Tornado, Will

When: November 17, 12:26 PM CST to 12:33 PM CST
Where: Will County, 1.74 mi NW of Braidwood to 2.52 mi NNE of Wilmington
Rating: EF2
Path length: 7.6 mi
Path width: 200 yd
Property damage: $2.0 million
Reported by: NWS Storm Survey
Coordinates: 41.285, -88.247

This is a continuation of a tornado that began at 12:22 PM CST in Grundy County. The tornado moved into Will County on N Will Road just south of State Route 113. There was considerable damage to businesses on State Route 113 between N Will Road and I-55. An RV dealership had numerous vehicles overturned and damaged. A two story structure lost its roof and had portions of its walls ripped off. A model home was completely removed from its foundation on the north side of State Route 113. A manufactured building had its roof ripped off with all the walls collapsed. Widespread tree damage was observed along the west side of I-55 where the tornado almost tracked parallel to as it weakened. The tornado crossed I-55 near Widows Road where several hardwood trees were uprooted. The tornado tracked into the Midewin Tallgrass Prairie where it damaged several metal structures just west of Route 53. The tornado lifted just east of Route 53. Maximum wind speeds were estimated to be up to 125 mph.

Thunderstorm Wind, Ford

When: November 17, 12:31 PM CST to 12:32 PM CST
Where: Ford County, 0.66 mi WSW of Cabery to 0.31 mi SSE of Cabery
Measured: 56 kt (64 mph) estimated gust
Property damage: $20,000
Reported by: NWS Storm Survey
Coordinates: 40.995, -88.211

A roof was lifted off a garage causing the collapse of a cinder block building. A chimney was toppled at St Joseph Church. A home TV antenna tower was blown over. There were sporadic uprooted trees and downed limbs throughout town.

Thunderstorm Wind, Kankakee

When: November 17, 12:32 PM CST
Where: Kankakee County, 1.8 mi SW of Reddick
Measured: 60 kt (69 mph) estimated gust
Reported by: Public
Coordinates: 41.100, -88.252

A large tree was blown over onto Route 17.

Thunderstorm Wind, Cook

When: November 17, 12:35 PM CST
Where: Cook County, Oak Lawn to 0.67 mi SE of Oak Lawn
Measured: 70 kt (81 mph) estimated gust
Property damage: $50,000
Reported by: Law Enforcement
Coordinates: 41.720, -87.750

A roof was blown off a gas station at 99th and Cicero. Tree limbs and power lines were blown down across town.

Hail, Cook

When: November 17, 12:35 PM CST to 12:37 PM CST
Where: Cook County, 0.51 mi W of Evanston
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.050, -87.690

Thunderstorm Wind, Kankakee

When: November 17, 12:35 PM CST
Where: Kankakee County, 0.73 mi WNW of Buckingham to 0.76 mi SSE of Buckingham
Measured: 60 kt (69 mph) estimated gust
Property damage: $15,000
Reported by: Trained Spotter
Coordinates: 41.054, -88.183

Route 115 was closed between 17000W and 16000W roads due to several power snapped power poles. Two power lines were blown down on 5000S Road between 16000W and 15000W roads. Several south facing windows were blown in on a house. A roof was blown off a shed.

Thunderstorm Wind, Ogle

When: November 17, 12:35 PM CST
Where: Ogle County, 2.72 mi ESE of Rochelle
Measured: 50 kt (58 mph) estimated gust
Reported by: Public
Coordinates: 41.905, -89.021

Two semi-trucks were overturned near the I-39 and I-88 interchange.

Thunderstorm Wind, Lee

When: November 17, 12:36 PM CST
Where: Lee County, 1.03 mi E of Steward
Measured: 65 kt (75 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.850, -89.000

Two older 8 to 10 inch diameter trees were blown down.

Thunderstorm Wind, Ogle

When: November 17, 12:37 PM CST
Where: Ogle County, 0.56 mi SE of Rochelle Muni Arpt
Measured: 58 kt (67 mph) measured gust
Reported by: AWOS
Coordinates: 41.893, -89.074

Thunderstorm Wind, Kankakee

When: November 17, 12:38 PM CST
Where: Kankakee County, 2.07 mi S of Dickeys to 2.5 mi S of Dickeys
Measured: 70 kt (81 mph) estimated gust
Property damage: $25,000
Reported by: Storm Chaser
Coordinates: 41.020, -88.030

The roof of a barn was torn off on the south side of 7000S between 8000W and 9000W/ Debris was thrown about half a mile to the northeast. A power pole was snapped at the base near the barn.

Thunderstorm Wind, Kankakee

When: November 17, 12:42 PM CST
Where: Kankakee County, 0.52 mi W of Bonfield
Measured: 65 kt (75 mph) estimated gust
Property damage: $20,000
Reported by: Public
Coordinates: 41.150, -88.060

A home was damaged when strong winds tore off a large section of a roof. A power pole was also blown down.

Tornado, Will

When: November 17, 12:42 PM CST to 12:48 PM CST
Where: Will County, 2.02 mi N of Wilton to 1.28 mi SW of Frankfort Arpt
Rating: EF2
Path length: 5.21 mi
Path width: 200 yd
Property damage: $750,000
Reported by: NWS Storm Survey
Coordinates: 41.409, -87.931

The tornado touched down south of W Bruns Road and east of S Kankakee Street. This tornado quickly intensified to EF-2 damaging five houses along Bruns Road rendering them uninhabitable by removing large sections of the roofs and leading to partial wall collapse. Four high tension power line towers were bent along S Schoolhouse Road. Two houses and a barn were heavily damaged on W Dralle Road where large portions of the roofs were ripped off. Several trees were snapped and uprooted as well. Another farm on S Scheer Road had roof damage consistent to EF-1 intensity. The last sign of damage occurred just south of Steger Road where large branches were blown down. Maximum winds were estimated to around 125 mph.

Hail, Cook

When: November 17, 12:45 PM CST to 12:47 PM CST
Where: Cook County, 0.52 mi E of Bridgeview
Measured: 1 in hail
Reported by: COOP Observer
Coordinates: 41.750, -87.790

Hail, Will

When: November 17, 12:45 PM CST to 12:47 PM CST
Where: Will County, 0.36 mi NW of Ingalls Park
Measured: 1.75 in hail
Reported by: Amateur Radio
Coordinates: 41.524, -88.005

Golf ball size hail was reported near Route 30 and Gouger Road.

Thunderstorm Wind, Kankakee

When: November 17, 12:46 PM CST
Where: Kankakee County, 0.62 mi S of Kankakee
Measured: 50 kt (58 mph) estimated gust
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.111, -87.850

A tree fell onto a house on Eagle Street.

Thunderstorm Wind, De Kalb

When: November 17, 12:50 PM CST
Where: De Kalb County, 0.56 mi NW of De Kalb to 2.08 mi NE of Elva
Measured: 50 kt (58 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.935, -88.758

A large tree was blown down onto power lines in the northwest side of Dekalb. Power lines were blown down near Route 23 and Gurler Road.

Thunderstorm Wind, De Kalb

When: November 17, 12:50 PM CST to 12:58 PM CST
Where: De Kalb County, 1.57 mi SSW of Hart to 0.19 mi W of Genoa
Measured: 52 kt (60 mph) estimated gust
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 42.078, -88.710

Two older trees were blown down on the north side of the Oak Club of Genoa Golf Course and many trees were uprooted. In Genoa, house siding was damaged by the winds. A 100 year old oak tree cracked at the base and landed on a neighbors garage.

Thunderstorm Wind, Kankakee

When: November 17, 12:51 PM CST
Where: Kankakee County, 1.61 mi SSE of St George to 1.85 mi SW of Yeager
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.178, -87.760

Between 10 and 20 power poles were snapped or blown down along 4000N between 6000E and 8000E.

Thunderstorm Wind, Cook

When: November 17, 12:55 PM CST
Where: Cook County, 2.43 mi ENE of Englewood
Measured: 60 kt (69 mph) measured gust
Reported by: AWOS
Coordinates: 41.788, -87.604

Thunderstorm Wind, Kankakee

When: November 17, 12:56 PM CST
Where: Kankakee County, 0.79 mi NNE of Grant Park
Measured: 50 kt (58 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.241, -87.646

Barn doors were blown in and a few power poles were blown down.

Flood, Cook

When: November 17, 12:58 PM CST to 2:00 PM CST
Where: Cook County, 1.68 mi SSE of Evanston to 1.66 mi SSE of Evanston
Cause: Heavy Rain
Reported by: Trained Spotter
Coordinates: 42.027, -87.670

The 500 block of Sheridan Road in Evanston was flooded with 6 to 8 inches of water.

Thunderstorm Wind, Kane

When: November 17, 1:00 PM CST
Where: Kane County, 0.16 mi NW of Elburn
Measured: 50 kt (58 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 41.881, -88.472

Several limbs up to 8 inches in diameter were blown down near Route 47 and Keslinger Road.

Tornado, Kankakee

When: November 17, 1:00 PM CST to 1:01 PM CST
Where: Kankakee County, 3.37 mi NE of Puder to 3.43 mi NE of Puder
Rating: EF1
Path length: 0.05 mi
Path width: 75 yd
Continued into: Will, Il (LOT)
Reported by: NWS Storm Survey
Coordinates: 41.297, -87.546

The tornado formed along the Kankakee-Will County Line just west of N 17480 E Road. Large branches from hardwood trees were broken off while an older softwood tree was snapped at the base. A hardwood tree was also snapped in half. The tornado had estimated winds to around 100 mph. The tornado continued into Will County at 1:01 PM CST.

Tornado, Will

When: November 17, 1:01 PM CST to 1:02 PM CST
Where: Will County, 4.99 mi S of Eagle Lake to 4.44 mi S of Eagle Lake
Rating: EF1
Path length: 0.11 mi
Path width: 150 yd
Property damage: $100,000
Reported by: NWS Storm Survey
Coordinates: 41.298, -87.545

This is a continuation of a tornado that formed in Kankakee County at 1:00 PM CST. The tornado moved northeast into Will County just west of N 17480 E Road. A large barn sustained significant damage to its roof and outer walls. Two adjacent metal outbuildings also had partial roof loss. Several softwood trees were snapped at the base or half way up with debris lofted about a thousand feet. A 400 lb tractor blade was moved about 60 feet while a grain pipe that had been riveted to the silo was ripped away. Minor tree damage was noted along E Delite Inn Road as well as minor damage to small barns and outbuildings. The tornado had estimated winds to around 100 mph.

Thunderstorm Wind, Du Page

When: November 17, 1:11 PM CST
Where: Du Page County, 0.26 mi SSW of (Dpa)dupage Co Arpt
Measured: 51 kt (59 mph) measured gust
Reported by: ASOS
Coordinates: 41.896, -88.251

Tornado, Iroquois

When: November 17, 1:14 PM CST to 1:15 PM CST
Where: Iroquois County, 5 mi ESE of Fountain Creek to 4 mi SW of Wellington
Rating: EF0
Path length: 1 mi
Path width: 100 yd
Reported by: NWS Storm Survey
Coordinates: 40.488, -87.734

This is a continuation of a tornado that began in Champaign County (NWS Central Illinois) and tracked across Vermilion County before entering the NWS Chicago county warning area in southern Iroquois County. Three homes had minor damage to either outbuildings or large trees.

Thunderstorm Wind, Cook

When: November 17, 1:17 PM CST
Where: Cook County, Schaumburg
Measured: 53 kt (61 mph) measured gust
Reported by: Trained Spotter
Coordinates: 42.030, -88.080

Numerous limbs were blown down, the largest of which was around a foot and a half in diameter.

Tornado, Iroquois

When: November 17, 1:19 PM CST to 1:23 PM CST
Where: Iroquois County, 0.93 mi S of Wellington to 2.08 mi WNW of Hallock Station
Rating: EF0
Path length: 4.52 mi
Path width: 75 yd
Property damage: $20,000
Reported by: NWS Storm Survey
Coordinates: 40.517, -87.673

Four farms were impacted with several large trees down or snapped. One outbuilding had its roof torn off. Maximum winds were estimated to 80 mph.

Thunderstorm Wind, Lake

When: November 17, 1:25 PM CST
Where: Lake County, 0.69 mi S of Benet Lake
Measured: 50 kt (58 mph) estimated gust
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 42.470, -88.080

Shingles were blown off of a roof and trees were blown down.

Hail, Cook

When: November 17, 1:36 PM CST to 1:37 PM CST
Where: Cook County, 1.65 mi SSE of Evanston
Measured: 1 in hail
Reported by: Trained Spotter
Coordinates: 42.027, -87.671

Quarter size hail was reported near Sheridan Road and South Boulevard.

Flood, Kane

When: November 17, 1:40 PM CST to 3:00 PM CST
Where: Kane County, 0.86 mi NW of Elgin to 0.69 mi WNW of Elgin
Cause: Heavy Rain
Reported by: Trained Spotter
Coordinates: 42.040, -88.290

Several streets in Elgin were flooded with one to two feet of water. A spotter measured 0.95 inches of rain.

High Wind, Kankakee

When: November 17, 2:15 PM CST
Where: Kankakee forecast zone
Measured: 51 kt (59 mph) measured gust
Reported by: AWOS
Coordinates: 41.138, -87.862 (the zone’s center; the record gives no point)

High Wind, Cook

When: November 17, 3:51 PM CST to 3:52 PM CST
Where: Cook forecast zone
Measured: 51 kt (59 mph) measured gust
Reported by: ASOS

The ASOS at O'Hare measured 59 mph wind gusts, while the ASOS at Midway measured 58 mph wind gusts.

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
High Wind: Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2013 Every state in 2013 This day in weather history The tornado archive for Illinois, 2013 Warnings in Illinois, November 2013

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 480998, 480999, 481000, 481001, 481002, 481003, 481004, 481005, 481006, 484024, 481007, 481008, 484025, 484026, 481009, 481010, 482202, 482201, 482203, 482206, 484027, 482207, 484030, 482208, 482236, 482237, 482238, 482239, 483959, 482241, 482240, 482242, 482701, 484032, 482243, 482693, 482699, 482691, 482694, 482695, and more.