A broken line of severe thunderstorms dropped south across far northeastern Illinois producing damaging winds.
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.
A broken line of severe thunderstorms dropped south across far northeastern Illinois producing damaging winds.
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 Jul 19, 6:41 PM CST, 1 hour 33 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 741 PM CDT FRI JUL 19 2013 .MESOSCALE DISCUSSION...740 PM... SCATTERED STORMS CONTINUE TO SHOW AN UPTICK IN INTENSITY AND COVERAGE ACROSS FAR NORTHERN ILLINOIS BACK WSW TO THE QUAD CITIES. MUCH OF THIS CONVECTION IS ON A PRE-FRONTAL CONVERGENCE AREA ABOUT 50-75 MILES AHEAD OF THE COOL FRONT. THIS CONVERGENT ZONE CERTAINLY NOW LOOKS TO BE THE PRIMARY FOCUS WITH STORM OUTFLOWS THEN DRIVING NEW DEVELOPMENT. RADAR BEHAVIOR OF THE STORMS ON DVN AND OUR RADAR INDICATE THEY OUR SWEEPING OUTFLOWS OUT QUICKLY FROM THEM. THE 00Z DVN RAOB INDICATED 3300 J/KG WITH STEEP LOW-LEVEL LAPSE RATES AND A GENERALLY HIGH LCL OF 5300 FT. NEARBY OBSERVATIONS ALSO INDICATE CLOUDS BASES NEAR 6000 FT. RAP ANALYZED DOWNDRAFT CAPE IS A VERY HIGH 1200-1700 J/KG. THIS ALL FAVORS MICROBURST POTENTIAL WITH THE ISOLATED STRONGEST STORMS...ESPECIALLY WITH DEEP WARM CLOUD LAYERS. EVEN SOME OF THE OUTFLOWS THEMSELVES COULD HAVE GUSTINESS IN EXCESS OF 40 MPH A WAYS /20+ MILES/ FROM THE STORM CORES THROUGH JUST QUICK PROPAGATION IN THIS TYPE OF ENVIRONMENT. BUT AGAIN COVERAGE ON THESE STRONGER DOWNDRAFTS IS LIKELY TO BE ISOLATED. THE HIGH WET BULB ZERO HEIGHT OF 12400 FT ON THE DVN RAOB CONTINUES TO INDICATE HAIL IS OF A LOW THREAT AND IT TOOK A VERY LARGE CORE TO GET JUST PENNY SIZE IN THE DVN CWA THUS FAR. INDIVIDUAL CORE MOTIONS AT THEIR FIRST DEVELOPMENT ARE VERY SLOW AND WOULD BE WHERE THE HEAVIEST RAIN IS MOST FAVORED...THOUGH LOCALLY HEAVY RATES ARE LIKELY UNDER ANY STORMS THIS EVE. GIVEN THE ENVIRONMENT THE STORMS ARE LIKELY TO CONTINUE TO MAINTAIN THEIR INTENSITY AND COVERAGE THROUGH 9-10 PM BUT THEN MAY SHOW A DIMINISHING AS BOUNDARY LAYER WINDS DECREASE AND OVERALL CONVERGENCE EASES INTO THE EVE. ALSO SURFACE-BASED LIFTING OF PARCELS OFF OF OUTFLOWS MAY REQUIRE MORE AND MORE LATER INTO THE EVE AND EARLY OVERNIGHT. CONVECTIVE ALLOWING MODELS...WHILE GENERALLY HAVING STRUGGLED MUCH OF TODAY WITH TOO MUCH ACTIVITY /POSSIBLY DUE TO THE HIGH CAPE/...HAVE GENERALLY AGREED FOR SEVERAL RUNS THAT A DIMINISHING TREND WOULD OCCUR LATE IN THE EVE INTO OVERNIGHT. TIMING WOULD FAVOR THESE NEARBY OR INTO THE DOWNTOWN CHICAGO AREA BY 930-1030 PM TAKING INTO ACCOUNT SOME POSSIBLE QUICKER PROPAGATION AND POSSIBLE DEVELOPMENT ON OUTFLOWS. SOME GUSTINESS IS FAVORED UNDER AND NEAR STORMS. IT WOULD APPEAR THAT BY MIDNIGHT THE STORMS...AT LEAST WHAT IS LEFT OF THEM...WOULD HAVE EVOLVED ESE. MTF && .DISCUSSION... 316 PM CDT THE MAIN FORECAST CONCERNS WILL FIRST FOCUS ON CONVECTIVE TRENDS THIS EVENING AND OVERNIGHT...AND ALSO THE HEAT THROUGH THIS EVENING. HOWEVER...OTHER CONCERNS IN THE FORECAST PERIOD WILL BE ADDITIONAL THREATS OF CONVECTION/MCS'S LATER THIS WEEKEND INTO EARLY NEXT WEEK. A COLD FRONTAL BOUNDARY IS CURRENTLY DROPPING SOUTHWARD ACROSS SOUTHERN WISCONSIN. LOW LEVEL CONVERGENCE ALONG THIS BOUNDARY HAS REMAINED FAIRLY WEAK AS A WELL MIXED WARM SECTOR HAS PRODUCED SOUTHWESTERLY FLOW RELATIVELY PARALLEL WITH THE SURFACE FRONT. AS A RESULT OF THIS...STORM DEVELOPMENT HAS REMAINED ISOLATED THUS FAR. IN SPITE OF THIS ADDITIONAL STORMS ARE STILL EXPECTED TO DEVELOP THROUGH THE AFTERNOON. FOR MORE INFO ON THESE STORMS REFERENCE THE MESO DISCUSSION ABOVE. THUNDERSTORMS WILL LIKELY BECOME HIGHER IN AERIAL COVERAGE EARLY THIS EVENING AS LOWER LEVEL MOISTURE CONVERGENCE INCREASES AHEAD THIS BOUNDARY. IT APPEARS THE FRONT WILL BE SLOW TO CLEAR NORTHERN ILLINOIS...POSSIBLY NOT PASSING SOUTH OF CHICAGO UNTIL AFTER 03 UTC THIS EVENING. THEREFORE...THUNDERSTORMS WILL BE POSSIBLY THROUGH AT LEAST EARLY TO MID EVENING ACROSS MUCH OF ILLINOIS. THERE WILL STILL BE A THREAT FOR STORMS TO PRODUCE MICROBURSTS WITH ISOLATED AREAS OF STRONG DAMAGING WINDS INTO THIS EVENING AS DOWNDRAFT CAPE WILL REMAIN IN EXCESS OF 1,000 J/KG. HOWEVER...THE OTHER THREAT WILL BE TORRENTIAL DOWNPOURS WITH THESE THUNDERSTORMS. THE RICH THETA-E AIR...WITH PWATS UP AROUND 2 INCHES WILL PROVIDE AMPLE CONDITIONS FOR VERY HEAVY RAINFALL FROM THESE STORMS. MY CONCERN IS THAT AS THE LOWER LEVEL CONVERGENCE INCREASES ALONG THE LOWER LEVEL FRONTAL ZONE...THAT SOME OF THESE STORMS COULD TRAIN...WITH A NEARLY EASTERLY CLOUD BEARING FLOW AROUND 25 KT EXPECTED...WHICH SHOULD BE NEARLY PARALLEL TO THE BOUNDARY. IT APPEARS THE MAIN THREAT FOR THIS WILL BE PRIMARILY SOUTH OF CHICAGO ACROSS MY EAST CENTRAL ILLINOIS AND NORTHWESTERN ILLINOIS COUNTIES. I HAVE MAINTAINED THE HEAVY RAIN WORDING IN THESE AREAS...ESPECIALLY THIS EVENING. THESE STORMS COULD EASY DROP 1 TO 2 INCHES PER HOUR...AND IF THE STORMS TRAIN OVER THE SAME AREAS THERE COULD BE SOME LOCALIZED AREAS OF HIGH RAINFALL AMOUNTS. THIS WILL NEED TO BE WATCHED THIS EVENING. CONFIDENCE IN WIDESPREAD HYDRO CONCERNS IN LOW...THEREFORE NO HEADLINES ARE PLANNED. THE THREAT FOR THUNDERSTORMS WITH HEAVY RAIN COULD CONTINUE OVERNIGHT ACROSS MY FAR SOUTHERN COUNTIES AS IT APPEARS THE FRONTAL BOUNDARY WILL BE SLOW TO MOVE ACROSS THESE AREAS. HOWEVER...IT APPEARS THAT THE FRONT SHOULD CLEAR THE AREA BY EARLY SATURDAY MORNING...ENDING THE THREAT FOR STORMS. I WILL LEAVE THE HEAT HEADLINES AS IS...WITH AN ENDING TIME AT 00 UTC THIS EVENING. WITH THE DEW POINTS MIXING OUT INTO THE UPPER 60S THE HEAT INDEX HAS NOT BEEN MUCH ABOVE 100. SO ALTHOUGH THE FRONT WILL NOT MOVE THROUGH TILL TONIGHT...IT APPEARS THE BIG HEAT WILL BE OVER BY 00 UTC...WITH COOLER AND LESS HUMID AIR TO MOVE IN LATER TONIGHT. SATURDAY AND SUNDAY WILL BE COOLER...WITH HIGHS MAINLY IN THE LOW TO MID 80S...WITH AN ONSHORE FLOW. DRY CONDITIONS ARE EXPECTED FOR MUCH OF THE WEEKEND. HOWEVER...THE CHANCE FOR MORE STORMS WILL INCREASE LATE SUNDAY AND SUNDAY NIGHT AS ANOTHER DISTURBANCE APPROACHES THE AREA. IT CURRENTLY APPEARS THE MAIN FOCUS MAY BE ACROSS THE SOUTHERN HALF TO TWO THIRDS OF MY AREA...BUT THE POTENTIAL FOR SOME ADDITIONAL HEAVY RAIN AREA POSSIBLE INTO EARLY MONDAY. SUBSIDENCE IN THE WAKE OF THIS DISTURBANCE MAY LEAD TO LITTLE TO NO CONVECTIVE ACTIVITY MONDAY AFTERNOON AND NIGHT. I HAVE THEREFORE TRENDED POPS DOWN SIGNIFICANTLY FOR THIS TIMEFRAME. HOWEVER...A FAIRLY DISTURBED WEST-NORTHWESTERLY FLOW ALOFT OVER THE CENTRAL CONUS WILL LIKELY DRIVE ANOTHER DISTURBANCE OR TWO ACROSS THE AREA ON TUESDAY. THIS WILL PRODUCE ANOTHER DECENT CHANCE OF THUNDERSTORMS TUESDAY INTO TUESDAY EVENING. ONCE THIS DISTURBANCE MOVES THROUGH...THE FLOW ALOFT LOOKS TO AMPLIFY SOME...WITH BUILDING HEIGHTS ACROSS THE WESTERN CONUS. THIS SHOULD ALLOW A COLD FRONT AND AREA OF SURFACE HIGH PRESSURE TO SHIFT SOUTHWARD ACROSS THE GREAT LAKES REGION. THIS SHOULD RESULT IN THE MAIN THREAT FOR CONVECTIVE ACTIVITY SHIFTING SOUTH OF THE REGION FOR WEDNESDAY THROUGH THURSDAY...WITH A CONTINUATION OF COOL TEMPERATURES INTO LATER NEXT WEEK. KJB && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 00Z... * ISOLD-SCT SHRA/TSRA AFFECTING THE AREA THROUGH APPROX 3/4Z. * BRIEF IFR VSBY AND GUSTY WINDS IN AN CELL THAT PASSES OVERHEAD. * WINDS SHIFTING NORTHWEST EARLY TONIGHT WITH COLD FRONTAL PASSAGE. * NORTH WINDS SATURDAY MORNING TURNING NORTHEAST. MDB //DISCUSSION...UPDATED 00Z... SHRA/TSRA CONTINUE TO SLOWLY DEVELOP WITH THE LATEST DEVELOPMENT OCCURRING NEAR THE IL/WI BORDER WHERE A NEW CU FIELD POPPED UP IN THE LAST HOUR. ADDITIONAL SPOTTY ACTIVITY IS OCCURRING TO THE NORTHWEST ALONG THE FRONT AND ALSO OUT TO THE WEST ACROSS EASTERN IOWA. ALL OF THIS ACTIVITY WILL GRADUALLY MOVE EAST-SOUTHEAST OVER THE NEXT SEVERAL HOURS. COVERAGE STILL LOOKS ISOLD-SCATTERED SO THERE IS A CHANCE THE TERMINALS WILL NOT ALL BE DIRECTLY AFFECTED BUT WILL STICK WITH VCTS/TEMPO TS MENTION FOR A FEW HOURS THIS EVENING. ANY CELL WILL LIKELY BRING VERY HEAVY DOWNPOURS AND IFR VSBY WITH THE STRONGEST ALSO BRINGING THE POTENTIAL FOR GUSTY WINDS. OTHERWISE...WEST-SOUTHWEST WINDS WILL BE EASING THEN TURN NORTHWEST LATE THIS EVENING/EARLY TONIGHT AS A COOL FRONT PASSES. WINDS WILL THEN TURN NORTH SATURDAY MORNING THEN NORTHEAST BY EARLY SATURDAY AFTERNOON. AN UPPER LEVEL TROUGH WILL BE PASSING LATE IN THE DAY SO THERE MAY BE AN INCREASE IN VFR CLOUD COVER AS WELL AS A ROGUE SHOWER OR TWO. MDB //ORD AND MDW CONFIDENCE...UPDATED 00Z... * HIGH CONFIDENCE IN TIMING OF SHRA/TSRA WINDOW. * HIGH CONFIDENCE IN BRIEF IFR VSBY UNDER SHRA/TSRA...MEDIUM CONFIDENCE THAT WIND GUSTS COULD ALSO OCCUR. * HIGH CONFIDENCE IN WIND TRENDS WITH MEDIUM CONFIDENCE IN TIMING OF CHANGES. MDB //OUTLOOK FOR ORD/MDW FOR 12Z SUNDAY-12Z FRIDAY...UPDATED 00Z... SUNDAY...CHANCE SHRA/TSRA AFTERNOON-OVERNIGHT. MONDAY...CHANCE SHRA/TSRA EARLY. TUESDAY...CHANCE SHRA/TSRA. WEDNESDAY AND THURSDAY...VFR. MDB && .MARINE... 329 PM CDT INITIAL CONCERN IN THE NEARSHORE WITH GUSTY WEST-SOUTHWEST WINDS OCCASIONALLY TO 30 KT AHEAD OF A COLD FRONT. WITH SLOW PROGRESS OF FRONT...IT IS POSSIBLE SMALL CRAFT ADVISORY MAY NEED TO BE EXTENDED FOR A FEW HOURS INTO MID EVENING. ALSO A FEW GUSTY STORMS ARE POSSIBLE THROUGH EARLY EVENING...WITH AN OUTSIDE CHANCE FOR GUSTS OVER 50 KT. THIS INCLUDES THE OPEN WATERS. BEHIND THE FRONT...A STRONG PUSH OF COOL AIR FOR THIS TIME OF YEAR WILL MOVE DOWN THE LAKE RESULTING IN INCREASING NORTHERLY WINDS...FIRST ON THE NORTH HALF SHIFTING TO THE SOUTH HALF DURING THE DAY SATURDAY. THERE MAY BE OCCASIONAL GUSTS TO 30 KT OVER THE OPEN WATERS. THEN HIGH PRESSURE WILL BUILD OVER THE LAKE BY SUNDAY AND WINDS WILL DIMINISH. THOUGH LOW PRESSURE WILL MOVE OVER THE REGION EARLY NEXT WEEK AND A COLD FRONT WILL PUSH ACROSS THE LAKE BY TUESDAY...WINDS LOOK TO REMAIN FAIRLY LIGHT OUT OF THE SOUTH UNTIL THE COLD FRONT PASSAGE. THEN AFTER THE FRONTAL PASSAGE LATE TUESDAY...THERE COULD POTENTIALLY BE A PERIOD OF MODESTLY STRONGER NORTHERLY WINDS FOLLOWED BY AN EXTENDED PERIOD OF LIGHT WINDS MID TO LATE NEXT WEEK AS HIGH PRESSURE SPREADS ACROSS THE GREAT LAKES. RC && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. 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 356 PM CDT FRI JUL 19 2013 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 202100- 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- 356 PM CDT FRI JUL 19 2013 /456 PM EDT FRI JUL 19 2013/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: SCATTERED THUNDERSTORMS...THE STRONGEST MAY PRODUCE: TORRENTIAL DOWNPOURS POSSIBLY PRODUCING LOCALIZED FLOODING. ISOLATED DAMAGING WIND GUSTS OVER 60 MPH. FREQUENT CLOUD TO GROUND LIGHTNING. AREAS AFFECTED AND TIMING: SCATTERED THUNDERSTORMS ARE PROBABLE TO DEVELOP LATE THIS AFTERNOON OR EARLY EVENING ACROSS NORTHERN ILLINOIS. THESE STORMS WILL GRADUALLY SHIFT ACROSS EAST CENTRAL ILLINOIS AND NORTHWEST ILLINOIS LATER THIS EVENING AND INTO THE OVERNIGHT HOURS. DISCUSSION: A COLD FRONT WILL APPROACH THE AREA THIS EVENING RESULTING IN AT LEAST SOME SCATTERED THUNDERSTORMS DEVELOPING. STRONG INSTABILITY COULD ALLOW FOR SOME ISOLATED SEVERE STORMS TO PRODUCE LOCALLY DAMAGING WIND GUSTS...HOWEVER WEAK WINDS ALOFT SHOULD GENERALLY KEEP THE OVERALL MAGNITUDE AND COVERAGE OF SEVERE THUNDERSTORMS RATHER LOW. THESE THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING TORRENTIAL DOWNPOURS WHERE THEY OCCUR...AND THIS COULD RESULT IN SOME MINOR LOCALIZED FLOODING. OPPRESSIVE HEAT AND HUMIDITY WILL CONTINUE WITH HEAT INDICES AROUND 100 THROUGH EARLY THIS EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. WHILE A MAJORITY OF THE TIME WILL BE DRY...THERE IS A CHANCE FOR A COUPLE PERIODS OF THUNDERSTORMS LATE SUNDAY INTO MONDAY AND AGAIN ON TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS MAY BE NEEDED EARLY THIS EVENING. && LMZ740>745-202100- 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- 356 PM CDT FRI JUL 19 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. SCATTERED THUNDERSTORMS ARE PROBABLE THIS EVENING. SOME OF THE STORMS COULD PRODUCE WIND GUSTS TO LOCALLY OVER 50 KNOTS ALONG WITH FREQUENT CLOUD TO LAKE LIGHTNING. STRONG WINDS WILL LEAD TO HAZARDOUS CONDITIONS FOR SMALL CRAFT THROUGH EARLY THIS EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. WHILE A MAJORITY OF THE TIME WILL BE DRY...THERE IS A CHANCE FOR A COUPLE PERIODS OF THUNDERSTORMS LATE SUNDAY THROUGH EARLY MONDAY...AND AGAIN ON TUESDAY. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-202100- 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- 356 PM CDT FRI JUL 19 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. SCATTERED THUNDERSTORMS ARE LIKELY THIS EVENING...ESPECIALLY ACROSS SOUTHERN LAKE MICHIGAN. SOME OF THE STORMS COULD PRODUCE WIND GUSTS TO LOCALLY OVER 50 KNOTS ALONG WITH FREQUENT CLOUD TO LAKE LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE WILL BE PERIODIC THUNDERSTORM CHANCES SUNDAY THROUGH TUESDAY...ESPECIALLY OVER SOUTHERN PORTIONS OF THE LAKE. && KJB 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
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 833 PM CDT FRI JUL 19 2013 ILZ004-005-011-012-200200- BOONE IL-DE KALB IL-KANE IL-MCHENRY IL- 833 PM CDT FRI JUL 19 2013 ...SPECIAL WEATHER STATEMENT... AT 832 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR GENOA...MOVING EAST AT 40 MPH. WINDS TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. CITIES AND TOWNS AFFECTED... GENOA... KINGSTON... HAMPSHIRE... HUNTLEY... LAKEWOOD... SLEEPY HOLLOW... GILBERTS... ALGONQUIN... LAKE IN THE HILLS... PRECAUTIONARY/PREPAREDNESS ACTIONS... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY RAINFALL COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR VISIBILITY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. && LAT...LON 4225 8828 4194 8828 4203 8880 4218 8880 TIME...MOT...LOC 0133Z 276DEG 34KT 4208 8862 BMD
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 844 PM CDT FRI JUL 19 2013 ILZ008-010-200230- LEE IL-OGLE IL- 844 PM CDT FRI JUL 19 2013 ...SPECIAL WEATHER STATEMENT... AT 841 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 10 MILES SOUTHWEST OF DIXON...MOVING EAST AT 40 MPH. WINDS TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. CITIES AND TOWNS AFFECTED... WALTON... DIXON... AMBOY... FRANKLIN GROVE... ASHTON... OTHER LOCATIONS AFFECTED... LEE COUNTY FAIRGROUNDS...SAUK VALLEY COLLEGE... PRECAUTIONARY/PREPAREDNESS ACTIONS... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY RAINFALL COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR VISIBILITY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. && LAT...LON 4188 8964 4192 8911 4164 8912 4168 8964 TIME...MOT...LOC 0144Z 271DEG 35KT 4177 8959 BMD
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 857 PM CDT FRI JUL 19 2013 ILZ005-006-012>014-200230- COOK IL-DUPAGE IL-KANE IL-LAKE IL-MCHENRY IL- 857 PM CDT FRI JUL 19 2013 ...SPECIAL WEATHER STATEMENT... AT 855 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR WEST DUNDEE...MOVING EAST AT 45 MPH. WINDS TO 55 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. CITIES AND TOWNS AFFECTED... EAST DUNDEE... WEST DUNDEE... SLEEPY HOLLOW... ELGIN... CARPENTERSVILLE... HOFFMAN ESTATES... STREAMWOOD... BARRINGTON... HANOVER PARK... OTHER LOCATIONS AFFECTED... ELGIN COMMUNITY COLLEGE...HARPER COLLEGE...OAKTON COMMUNITY COLLEGE...SCHAUMBURG BOOMERS BASEBALL... PRECAUTIONARY/PREPAREDNESS ACTIONS... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY RAINFALL COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR VISIBILITY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. && LAT...LON 4220 8787 4195 8787 4199 8834 4216 8833 TIME...MOT...LOC 0157Z 275DEG 39KT 4208 8826 BMD
The Chicago radar (KLOT), 51 km away, was scanning. The volume nearest the first event began at 02:14 UTC.
2 thunderstorm wind. Local standard time, as filed.
Winds were estimated between 55 and 60 mph on the north side of Hoffman Estates.
A large tree limb was blown down on South Salem Lane in Arlington Heights.
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, July 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: 468878, 468879.