During the evening of August 30th, a line of severe thunderstorms dropped south across the northeastern Illinois including the Chicago metro area producing damaging winds and large hail.
Every event with a place to put it. Tap one for its entry below.
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.
The episode as NWS LOT wrote it up.
During the evening of August 30th, a line of severe thunderstorms dropped south across the northeastern Illinois including the Chicago metro area producing damaging winds and large hail.
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 Aug 30, 2:41 PM CST, 1 hour 1 minute earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 341 PM CDT FRI AUG 30 2013 .MESOSCALE DISCUSSION... 253 PM CDT THUNDERSTORMS CONTINUE TO DEVELOP ALONG A SOUTH MOVING COLD FRONT THAT STRETCHES FROM JUST NORTH OF MILWAUKEE WSW TO JUST NORTH OF DUBUQUE THIS HOUR. LATEST SPC MESOANALYSIS INDICATES A CORRIDOR OF UPCAPPED 3000-3500 MLCAPE ALONG AND JUST AHEAD OF THE FRONTAL BOUNDARY. WHILE OVERALL CONVERGENCE ALONG THE FRONT IS WEAK...A SUBTLE SHORTWAVE DROPPING SOUTHEAST INTO SOUTHWESTERN WISCONSIN HELPING TO INCREASE BROAD SCALE ASCENT OVER THE AREA AS WELL AS INCREASE THE DEEP LAYER SHEAR TO A MARGINAL 30 KT NEAR THE BEST INSTABILITY. A LITTLE MORE CONCERNING IS THE NEARLY 1500 J/KG DCAPE AHEAD THE BOUNDARY THAT WILL SUPPORT STRONG AND DAMAGING WINDS REACHING THE SURFACE. EXPECT THE FRONT AND MAIN LINE OF THUNDERSTORMS TO SAG SOUTH INTO NORTHERN ILLINOIS AROUND 5 PM THIS EVENING...WITH ISOLATED DEVELOPMENT POSSIBLY SOONER AHEAD OF THE FRONT. MAIN THREAT IS EXPECTED TO BE STRONG AND DAMAGING WINDS WITH A SECONDARY THREAT OF HAIL...WHICH WILL LIKELY BE SPORADIC AS STORMS MAY BE SOMEWHAT PULSEY GIVEN THE MARGINAL SHEAR ENVIRONMENT. ALSO NOTABLE FROM THE STORM CURRENTLY NEARING MKE IS THE FREQUENT TO NEAR CONTINUOUS LIGHTNING THAT IS OCCURRING. BMD && .DISCUSSION... 300 PM CDT FORECAST CONCERNS INCLUDE THUNDERSTORM POTENTIAL THROUGH THIS EVENING...CLOUD COVER AND TEMPERATURES TOMORROW AND THUNDERSTORM POTENTIAL SUNDAY. REFER TO MESOSCALE DISCUSSION FOR MORE IN DEPTH INFORMATION ON SEVERE TSTORM POTENTIAL THROUGH THIS EVENING. SHORT TERM...TONIGHT THROUGH LABOR DAY... THE WEAK COLD FRONT RESPONSIBLE FOR THE STORMS THIS AFTERNOON AND EVENING WILL SAG SLOWLY SOUTH THROUGH THE CWA BUT NOT CLEAR OUR SOUTHERN COUNTIES...WITH WINDS TURNING NORTH AND NORTHEAST BEHIND IT. SINCE AIRMASS BEHIND FRONT REMAINS WARM AND MOIST AND GIVEN LOW CLOUDS OVER NORTHERN MICHIGAN AND WISCONSIN...EXPECT STRATUS TO OOZE INTO THE AREA FROM THE NORTH LATE THIS EVENING THROUGH THE OVERNIGHT. THIS WILL PREVENT TEMPERATURES FROM FALLING QUICKLY SO IT WILL BE ANOTHER MILD NIGHT WITH LOWS IN THE UPPER 60S AND LOWER 70S. HAZE OR LIGHT FOG IS POSSIBLE FOR SOME AREAS...BUT PRIMARILY EXPECT LOW CLOUDS. SIMILAR TO A FEW DAYS AGO...THE LACK OF SIGNIFICANT AIRMASS EXCHANGE BEHIND THE FRONT WILL LIKELY SUPPORT A PERSISTENT STRATUS DECK THAT LINGERS INTO SATURDAY MORNING BEFORE DISSIPATING FOR INLAND AREAS. ITS POSSIBLE LAKE STRATUS COULD LINGER OVER SOUTHERN LAKE MICHIGAN AND ADJACENT LAKEFRONT AREAS INTO SATURDAY EVENING. HAVE TRENDED TEMPERATURES TOMORROW CLOSER TO MET GUIDANCE WHICH HAS A HANDLE ON THE ANTICIPATED SLOWER EROSION OF CLOUD COVER. WITH ONSHORE FLOW AND CLOUDS...LAKEFRONT AREAS MAY NOT ESCAPE THE LOWER AND MID 70S...WITH LOW AND MID 80S WELL AWAY FROM THE LAKE. A FEW UPPER 80S ARE POSSIBLE IN THE FAR SOUTH. MOISTURE POOLING NEAR THE STALLED OUT FRONTAL BOUNDARY AND THE WARMER TEMPERATURES COULD SUPPORT A FEW STORMS IN THE FAR SOUTHEASTERN CWA...SO MAINTAINED SLIGHT TO LOW CHANCE POPS. AFTER A DRY SATURDAY NIGHT...ATTENTION WILL TURN TO A SHARPENING UPPER TROUGH AND SURFACE COLD FRONT POISED TO AFFECT AREA ON SUNDAY. CLOUD COVER IS A BIT OF A WILD CARD...BUT 850 MB TEMPERATURES APPROACHING 20C AND 925 TEMPS LOW-MID 20S WILL RESULT IN A VERY WARM DAY WITH HIGHS IN THE UPPER 80S TO AROUND 90 AWAY FROM LAKE MICHIGAN. WEAK PRESSURE GRADIENT AND FLOW ALOFT IS EXPECTED TO ALLOW FOR A LAKE BREEZE BOUNDARY TO PUSH INLAND AND COOL OFF LAKESHORE AREAS SOME. DESPITE QUESTIONS OVER MOISTURE RETURN AHEAD OF THE APPROACHING COLD FRONT...A STRONGER UPPER WAVE...HEIGHT FALLS ASSOCIATED WITH THE DEEPENING TROUGH AND A SHARPER BAROCLINIC ZONE WILL SUPPORT AT LEAST SCATTERED THUNDERSTORM DEVELOPMENT SUNDAY AFTERNOON AND EVENING. DID NOT MAKE BIG CHANGES TO POPS FROM PREVIOUS FORECAST. THIS FRONT WILL FINALLY SCOUR OUT THE UNSEASONABLY WARM AND HUMID AIR MASS WE HAVE BEEN UNDER...SO DO NOT EXPECT WIDESPREAD STRATUS BEHIND IT. THE 12Z RUN OF THE GFS HAS SLOWED THE ARRIVAL OF THE BEST PUSH OF COOL AIR UNTIL MONDAY EVENING...BUT OTHER GUIDANCE CONTINUES WITH THE IDEA OF 10C OR A BIT LOWER AIR AT 850 MB PUSHING IN EARLIER. HAVE HEDGED TEMPS A BIT WARMER IN THE SOUTHERN CWA AND WILL LIKELY NEED ADDITIONAL WARMING FOR THE WHOLE AREA IF OTHER GUIDANCE TRENDS TO THE GFS. OTHERWISE KEPT MUCH OF THE AREA SIMILAR TO THE PREVIOUS FORECAST....WITH MID AND UPPER 70S AWAY FROM LAKE MICHIGAN. STRONG ONSHORE FLOW WILL LIKELY KEEP LAKESHORE AREAS IN THE LOWER 70S...IF NOT A FEW DEGREES LOWER AND ALSO RESULT IN LARGE WAVES AND STRONG CURRENTS HAZARDOUS TO SWIMMING. LONG TERM...MONDAY NIGHT THROUGH THURSDAY... HIGH PRESSURE WILL SPREAD ACROSS THE REGION AND MORE OR LESS REMAIN IN PLACE THROUGH THE MIDDLE OF THE WORK WEEK. THIS WILL LIKELY RESULT IN ANOTHER EXTENDED DRY PERIOD...THOUGH SOME GUIDANCE IS INDICATING A LOW CHANCE FOR PRECIP WEDNESDAY NIGHT INTO THURSDAY. AFTER FAIRLY COOL TEMPERATURES TUESDAY...TEMPERATURES WILL WARM BACK TO NEAR NORMAL ON WEDNESDAY...POSSIBLY FOLLOWED BY MODEST COOLING BEHIND A COLD FRONT ON THURSDAY. RC && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 20Z... * SCATTERED TSRA EXPECTED TO BE NEAR BY STARTING 23Z OR SO. * WINDS TURNING NORTH-NORTHWEST THEN NORTH-NORTHEAST BEHIND THUNDERSTORMS/COOL FRONT TOWARD 00/01Z. * LOWER END MVFR CIGS EXPECTED BY MID/LATE EVENING...WITH IFR POSSIBLE EARLY SATURDAY MORNING. MDB //DISCUSSION...UPDATED 20Z... STORM COVERAGE CONTINUES TO SLOWLY INCREASE ACROSS SOUTHERN WISCONSIN WITH A FEW ISOLATED CELLS TRYING TO FIRE FURTHER TO THE SOUTH. HAVE SLOWED TIMING OF MAIN THUNDERSTORM WINDOW BY AN HOUR AND TIGHTENED UP THE SHIFT FROM NNW TO NNE WINDS BEHIND THE STORMS/WITH THE FRONT THIS EVENING. HAVE A BIT LESS CONFIDENCE IN DETAILS OF LOWERING CEILINGS THIS EVENING...MAINLY WITH RESPECT TO TIMING...AS MUCH OF THE CLOUD COVER BEHIND THE STORMS IS TAKING ON AN DIURNAL APPEARANCE SO ARRIVAL OF STRATUS MAY BE DELAYED. MDB FROM 18Z... MAIN FOCUS IS SCATTERED TSRA DEVELOPMENT TO THE NORTHWEST AFFECTING THE AREA LATE THIS AFTERNOON/EARLY THIS EVENING...AS WELL AS A SHIFT TO NORTH-NORTHEAST WINDS BY MID EVENING OR SO. SURFACE ANALYSIS SHOWS A COOL FRONTAL BOUNDARY FROM JUST SOUTH OF KSBM TO NEAR KDLL TO JUST SOUTH OF KPDC. VISIBLE SATELLITE SHOWS SOME INCREASE IN CUMULUS DEVELOPMENT JUST AHEAD OF THE FRONT ACROSS SOUTHERN WISCONSIN WITH RADAR IMAGERY SHOWING SOME SCATTERED STORMS JUST WEST OF LAKE MICHIGAN. WITH BUILDING INSTABILITY THE COVERAGE OF SCATTERED STORMS SHOULD INCREASE TO THE WEST ALONG THE FRONT AND PUSH SOUTHWARD THROUGH LATE AFTERNOON. HAVE MADE LITTLE CHANGE TO THE TAFS FOR 18Z IN TERMS OF TIMING OF TS...THOUGH AM A LITTLE CONCERNED THAT ARRIVAL IN THE AREA MAY NEED TO BE SLOWED SLIGHTLY. DURATION LOOKS TO BE ON THE ORDER OF A FEW HOURS AND COVERAGE MAY BE SUCH THAT NOT ALL TERMINALS ARE DIRECTLY AFFECTED...BUT HAVE GOOD CONFIDENCE IN ACTIVITY BEING IN THE AREA. THE OTHER CONCERN WILL BE WINDS SHIFTING TO THE WEST AS THE FRONT APPROACHES THEN TO THE NORTH-NORTHWEST AND THEN NORTH-NORTHEAST SOON AFTER. THIS SHIFT MAY OCCUR AS STORMS ARE CROSSING THE AREA SO TO THE SHIFT COULD OCCUR SLIGHTLY EARLY THAN INDICATED. ONCE STORMS EXIT...STRATUS IS EXPECTED TO SPREAD IN BY MID EVENING...WITH LOWER MVFR BASES LIKELY. A FURTHER LOWERING TO IFR IS POSSIBLE LATE TONIGHT/EARLY SATURDAY. THE INCOMING AIRMASS WILL NOT BE NOTABLY DRIER BUT WIND SPEEDS LOOK TO REMAIN SLIGHTLY ELEVATED SO FOG DEVELOPMENT LOOKS UNLIKELY BUT WILL NEED TO MONITOR IF WINDS DROP OFF...ESPECIALLY OVER AREAS THAT RECEIVE RAINFALL. NORTHEAST WINDS WILL CONTINUE SATURDAY. IMPROVEMENT TO VFR IS EXPECTED WITH SCATTERING CLOUDS EARLY SATURDAY AFTERNOON...THOUGH THIS MAY TAKE A BIT LONGER AT GYY. MDB //ORD AND MDW CONFIDENCE...UPDATED 20Z... * MEDIUM-HIGH CONFIDENCE IN TIMING AND OCCURRENCE OF TSRA. * HIGH CONFIDENCE IN WINDS SHIFTING TO THE NORTH-NORTHWEST THEN NORTH-NORTHEAST...MEDIUM-HIGH CONFIDENCE IN TIMING. * MEDIUM-HIGH CONFIDENCE IN LOWER END MVFR CIGS BY MID EVENING...LOW-MEDIUM CONFIDENCE IN TIMING. LOW-MEDIUM CONFIDENCE IN SOME IFR SATURDAY MORNING. MDB //OUTLOOK FOR ORD/MDW FOR 00Z SUNDAY-12Z FRIDAY...UPDATED 12Z... SATURDAY NIGHT...VFR. SUNDAY...VFR. CHANCE OF TSRA IN THE AFTN/NIGHT. COULD SEE LOCAL MVFR/IFR CIGS. MONDAY THROUGH THROUGH...VFR. BEACHLER && .MARINE... 318 PM...LOW PRESSURE OVER NORTHERN LAKE HURON WILL MOVE EAST TONIGHT AS A TRAILING COLD FRONT MOVES SOUTH OF LAKE MICHIGAN BY MID EVENING. THE GRADIENT WILL INCREASE BEHIND THIS FRONT WITH NORTHERLY WINDS 15-25 KTS THROUGH MUCH OF THE NIGHT WITH A FEW HIGHER GUSTS POSSIBLE. WEAK HIGH PRESSURE WILL BUILD ACROSS THE WESTERN LAKES ON SATURDAY AND THIS WILL LIKELY LIMIT THE DURATION OF STRONGER WINDS ON THE FAR SOUTH END OF LAKE MICHIGAN. THUS AT THIS POINT...NOT EXPECTING SMALL CRAFT CRITERIA SATURDAY MORNING FOR EITHER THE ILLINOIS OR INDIANA NEARSHORE WATERS. WINDS MAY GO LIGHT AND VARIABLE SATURDAY EVENING AS THIS HIGH MOVES EAST...THEN WINDS WILL TURN SOUTHERLY AHEAD OF THE NEXT LOW MOVING ACROSS ONTARIO ON SUNDAY. A TRAILING COLD FRONT FROM THIS LOW WILL MOVE ACROSS LAKE MICHIGAN SUNDAY EVENING. A RATHER STRONG GRADIENT COMBINED WITH MUCH COOLER AIR SPREADING ACROSS THE REGION SHOULD RESULT IN A PROLONGED PERIOD OF NORTHERLY WINDS 15-25 KTS AND POSSIBLY SOME HIGHER GUSTS TO 30 KTS ON MONDAY. WINDS WILL SLOWLY DIMINISH MONDAY NIGHT INTO TUESDAY AS HIGH PRESSURE BUILDS ACROSS THE LAKES REGION TUESDAY. CMS && .LOT WATCHES/WARNINGS/ADVISORIES... IL...HEAT ADVISORY...ILZ003-ILZ008-ILZ010-ILZ019 UNTIL 7 PM FRIDAY. IN...NONE. LM...NONE. && 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
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
442 PM CDT FRI AUG 30 2013
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
312145-
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-
442 PM CDT FRI AUG 30 2013 /542 PM EDT FRI AUG 30 2013/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
WEATHER HAZARDS EXPECTED:
SCATTERED THUNDERSTORMS LATE AFTERNOON AND THIS EVENING.
THE MOST INTENSE COULD PRODUCE:
DAMAGING WIND GUSTS UP TO AROUND 60 MPH...
HAIL UP TO THE SIZE OF QUARTERS...
FREQUENT DEADLY CLOUD TO GROUND LIGHTNING...
HEAVY DOWNPOURS WITH LOCALIZED PONDING OF WATER.
AREAS AFFECTED AND TIMING:
SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS ALL OF NORTHERN
ILLINOIS AND NORTHWEST INDIANA THROUGH MID EVENING.
DISCUSSION:
MODERATE TO STRONG INSTABILITY OUT AHEAD OF A COLD FRONT WILL
SUPPORT SCATTERED THUNDERSTORMS PUSHING SOUTHWARD ACROSS THE AREA
THROUGH THE EVENING.
HOT AND HUMID CONDITIONS WITH HEAT INDEX VALUES NEAR OR SLIGHTLY
OVER 100 DEGREES WILL CONTINUE THE REST OF THE AFTERNOON AND EARLY
EVENING BEFORE THE SUN GETS LOWERS TOWARD THE HORIZON.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE IS A CHANCE OF THUNDERSTORMS ON SATURDAY...MAINLY SOUTH OF
A LINE FROM GIBSON CITY IL NORTHEASTWARD TO VALPARAISO IN. THERE
IS A CHANCE OF THUNDERSTORMS AGAIN SUNDAY AND SUNDAY NIGHT ACROSS
THE ENTIRE OUTLOOK AREA.
LARGE WAVES COULD PRODUCE STRONG CURRENTS AND HAZARDOUS SWIMMING
CONDITIONS AT LAKE MICHIGAN BEACHES ON MONDAY...LABOR DAY...
THROUGH TUESDAY MORNING.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NEEDED THROUGH THIS EVENING FOR REPORTING OF
ANY SEVERE WEATHER OCCURRENCES OBSERVED.
&&
LMZ740>745-312145-
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-
442 PM CDT FRI AUG 30 2013
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA
NEARSHORE WATERS OF LAKE MICHIGAN.
.DAY ONE...TONIGHT.
SCATTERED THUNDERSTORMS ARE EXPECTED INTO THE EARLY EVENING. SOME
STORMS COULD BE STRONG TO SEVERE AND PRODUCE WIND GUSTS OF 40 TO
50 KT. LARGE HAIL IS ALSO POSSIBLE. FREQUENT LIGHTNING FROM SOME
OF THESE STORMS WILL POSE A SERIOUS HAZARD TO VESSELS AND ALL
PARTIES ABOARD. GUST WINDS AND CHOPPY WATERS WILL LIKELY BE
ENCOUNTERED NEAR ANY OF THE THUNDERSTORMS.
PATCHY FOG IS POSSIBLE LATE TONIGHT AFTER THE A COLD FROM PASSES
BY.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE IS A CHANCE OF THUNDERSTORMS SUNDAY AND SUNDAY EVENING.
STRONG WINDS AND HIGH WAVES MAY LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT MONDAY THROUGH TUESDAY MORNING ALONG THE INDIANA
SHORE AND PORTIONS OF THE ILLINOIS SHORE.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-312145-
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-
442 PM CDT FRI AUG 30 2013
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...TONIGHT.
SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING ON THE
FAR SOUTHERN PORTION OF LAKE MICHIGAN. SOME STORMS COULD BE STRONG
TO SEVERE AND PRODUCE WIND GUSTS OF 40 TO 50 KT. LARGE HAIL AND
FREQUENT LIGHTING ARE ALSO POSSIBLE WITH THE STORMS.
PATCHY FOG IS POSSIBLE TONIGHT FOR THE ENTIRE LAKE.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH SUNDAY EVENING.
&&
RC/TRSSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 1238 PM CDT FRI AUG 30 2013 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 302100- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK... WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO... OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...PONTIAC... WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...RENSSELAER... FOWLER 1238 PM CDT FRI AUG 30 2013 /138 PM EDT FRI AUG 30 2013/ HOT AND HUMID...WITH SEVERE STORMS POSSIBLE LATER TODAY... TEMPERATURES HAVE RISEN TO NEAR OR A BIT ABOVE 90 DEGREES ACROSS THE AREA AS OF EARLY AFTERNOON. COMBINED WITH DEWPOINTS IN THE 70S...HEAT INDEX VALUES WILL TOP OUT AT BETWEEN 100 AND 105 DEGREES THIS AFTERNOON AS TEMPERATURES RISE A FEW MORE DEGREES. HOT WEATHER SAFETY PRECAUTIONS SHOULD BE TAKEN FOR ANYONE SPENDING A PROLONGED PERIOD OF TIME OUTDOORS THROUGH THE AFTERNOON. THE HOT AND HUMID AIRMASS IN PLACE AHEAD OF A COLD FRONT PUSHING SOUTHWARD WILL LIKELY SET THE STAGE FOR A BROKEN LINE OF THUNDERSTORMS MID TO LATE THIS AFTERNOON INTO THIS EVENING. STRONG INSTABILITY COULD ALLOW FOR A FEW OF THE MOST INTENSE STORMS TO BECOME SEVERE AND PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL...AS WELL AS FREQUENT CLOUD TO GROUND LIGHTNING AND TORRENTIAL DOWNPOURS. BE ALERT FOR THE POSSIBILITY OF SEVERE WEATHER LATER TODAY INTO THIS EVENING. RC 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
The Milwaukee radar (KMKX), 73 km away, was scanning. The volume nearest the first event began at 21:42 UTC.
13 thunderstorm wind, 11 hail. Local standard time, as filed.
Multiple trees of about 12 inches in diameter were blown down near the intersection of Deep Lake Road and Route 132.
The greatest damage occurred along Hazelwood Drive just south of Hastings Lake where several pine trees were snapped in the middle and many hardwood tree limbs up to 30 feet in length were broken off with power lines down. Scattered structural damage was also reported.
Penny size hail fell near the intersection of Grand Avenue and Cedar Lake Road.
Quarter size hail fell near the intersection of Lake Street and Washington Street.
Winds were estimated to 60 mph by a trained spotter near Grand Avenue and Almond Road. Over 20 trees were blown down near Route 45 and Rollins Road.
Limbs and large trees were blown down.
Multiple trees of 12 inches in diameter were blown down near the intersection of Route 45 and Casey Road.
An amateur radio operator measured 55 mph winds in Grayslake, however, locally higher winds were estimated from damage reports across the area. Numerous branches were blown down on the 600 block of Stuart Street. Multiple trees were blown down near the intersection of Route 132 and Route 45. A large tree fell onto a car.
Multiple trees at least 18 inches in diameter were blown down near the intersection of Hammond Street and Seymour Avenue. A 15-inch diameter tree was blown down on Lake Street just East of Butterfield Road.
Multiple reports of estimated wind gusts to around 70 mph came in from Skokie and Evanston. Three large trees were blown onto homes in Skokie.
Winds were estimated to around 60 mph with multiple tree branches blown down.
Tree limbs up to 8 inches in diameter were blown down across Edison Park. Multiple large tree limbs were split off from trees with some blocking roads and others falling onto power lines.
Penny size hail was reported near the intersection of Sheridan Road and Hollywood Avenue.
There were multiple reports of winds estimated between 60 and 70 mph in Chicago. Winds estimated to 60 mph near the intersection of Irving Park Road and North Kostner Avenue caused trees to be blown down. Large branches were blown down just northwest of Downtown where winds were estimated to 60 mph. Winds were estimated to 70 mph at Montrose and Lake Shore Drive.
Penny size hail was reported just northwest of Downtown while quarter size hail was reported at Montrose and Lake Shore Drive.
Trees and crops were damaged near the intersection of Route 52 and Route 23.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2013Every state in 2013This day in weather historyWarnings in Illinois, August 2013
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: 474977, 474978, 472821, 472820, 472822, 472823, 472824, 474983, 472834, 472836, 472831, 472832, 475164, 472848, 472849, 472850, 472851, 472852, 472853, 472854, 472855, 472856, 472857, 472858.