Strong to severe thunderstorms moved across parts of northern Illinois during the evening hours of June 21st. Additional storms developed during the morning hours of June 21st as well as the early morning hours of June 22nd.
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.
Strong to severe thunderstorms moved across parts of northern Illinois during the evening hours of June 21st. Additional storms developed during the morning hours of June 21st as well as the early morning hours of June 22nd.
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 Jun 21, 8:24 AM CST, 1 hour 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 924 AM CDT MON JUN 21 2010 .MESOSCALE DISCUSSION... 905 AM CDT COMPLEX CONVECTIVE FORECAST ONCE AGAIN FOR TODAY. CURRENT MCS WITH ASSOCIATED MCV SHOULD PUSH EAST OF THE CWA BY MID TO LATE MORNING. ANOTHER WEAK REMNANT MCV ALSO IS NOTED IN NE IA PUSHING ENE WITH SOME SHOWERS ASSOCIATED WITH THIS FEATURE POSSIBLY AFFECTING FAR NORTHERN ILLINOIS INTO THE EARLY AFTERNOON...THOUGH GIVEN THE LACK OF CONVECTION TO MAINTAIN IT SUSPECT THAT THIS FEATURE SHOULD FADE WITH TIME. OF GREATER CONCERN FOR OUR CONVECTIVE CHANCES LATER TODAY IS THE MCS OVER WESTERN IOWA AND NORTHWEST MISSOURI AND ITS ASSOCIATED MCV WHICH SHOWS UP QUITE NICELY ON REGIONAL PROFILER NETWORK AND WATER VAPOR IMAGERY. OUTFLOW FROM THIS MORNING'S MCS HAS PUSHED FAR TO THE SOUTH AND NOW LIES SOUTH OF INTERSTATE 70...HOWEVER NORTH OF THIS OUTFLOW AND AHEAD OF THE MCS/MCV OVER NW MO/SW IA VISIBLE SATELLITE IMAGERY SHOWS THAT SKIES HAVE CLEARED OUT. THE RELATIVELY CLEAR SKIES SHOULD GIVEN THE AREA AHEAD OF THIS MCV AMPLE OPPORTUNITY TO RECOVER FROM THIS MORNINGS CONVECTION. MORNING SOUNDINGS TOP/ILX BOTH SUGGEST THE PRESENCE OF A NICE EML IN THE CONVECTIVELY UNDISTURBED AIRMASS...SO THERE IS REASON TO BE CONCERNED ABOUT MODERATE TO STRONG INSTABILITY DEVELOPING IN THE AREA AHEAD OF THIS VORT THAT BECOMES STRONGLY HEATED. GIVEN THE ANTICIPATED PATH OF THIS MCV AND LIKELIHOOD FOR STRONG DESTABILIZATION AHEAD OF IT FEEL THAT REGENERATION/INTENSIFICATION OF CONVECTION IS LIKELY THIS AFTERNOON WITH THIS FEATURE. THIS WOULD LIKELY PLACE AT LEAST THE SOUTHERN HALF OF OUR CWA AT A HEIGHTENED RISK FOR SEVERE THUNDERSTORMS WITH DAMAGING WINDS LATER THIS AFTERNOON AND EVENING. IZZI && .DISCUSSION... 410 AM CDT VERY CHALLENGING FORECAST FOR NEXT COUPLE OF DAYS...WITH PROSPECTS FOR SEVERAL ROUNDS OF THUNDERSTORMS AND THE POTENTIAL FOR SEVERE WEATHER AND HEAVY RAINFALL TODAY INTO WEDNESDAY. 00Z ANALYSIS INDICATES UPPER PATTERN CHARACTERIZED BY BROAD UPPER TROUGH OVER WESTERN CONUS...AND FLAT RIDGING ACROSS THE SOUTHEAST. FAST BELT OF WEST/SOUTHWESTERLY MID/UPPER LEVEL WINDS FLOWS FROM THE SOUTHERN ROCKIES TO THE GREAT LAKES REGION. LOW LEVELS HAVE BECOME QUITE CONVECTIVELY DISTURBED ACROSS THE PLAINS...THOUGH MOISTURE DISCONTINUITY/FRONTAL ZONE BASICALLY STRETCHES FROM KS/NEB BORDER EASTWARD ALONG IA/MO BORDER THEN INTO CENTRAL IL. THIS BAROCLINIC ZONE CONTINUES TO BE FOCUS FOR DEVELOPMENT OF THUNDERSTORM CLUSTERS EARLY THIS MORNING...WITH MCS MOVING INTO WEST CENTRAL IL...AND ANOTHER BACK ACROSS NEB. COMPLICATING THINGS A BIT...CONVECTION ALSO OCCURRING WELL TO THE NORTH ACROSS THE DAKOTAS/WESTERN MN IN ASSOCIATION WITH MID LEVEL SHORT WAVE PROPAGATING NORTH OF RIDGE. GUIDANCE NOT HANDLING COMPLEX PRECIP FIELDS ALL THAT WELL SO HAVE TRIED TO BASE NEAR TERM FORECAST ON ANALYSIS/OBSERVATIONAL DATA. MCS CURRENTLY TRACKING ALONG BAROCLINIC ZONE ACROSS NERN MO/WRN IL AND SERN IA OCCURRING IN ASSOCIATION WITH SOUTHERN PERIPHERY OF SHORT WAVE MOVING ACROSS UPPER MIDWEST EARLY THIS AM...AND IN REGION OF ENHANCED MOIST/THERMAL ADVECTION PROVIDED BY 20 KT 850 MB JET PER PROFILER NETWORK. RUC OBJECTIVE ANALYSIS INDICATES AXIS OF 2000+ J/KG MLCAPES EXTEND FROM NORTHEAST MO INTO CNTRL/SRN IL AND IND AND EXPECT THIS ACTIVITY TO CONTINUE TO SPREAD EAST ACROSS MAINLY CENTRAL IL THIS AM. MORE ISOLATED CONVECTIVE CELLS HAVE BEEN NOTED TRYING TO DEVELOP OVER NORTHWEST IL...THOUGH DESPITE SOME LARGE SCALE ASCENT AHEAD OF SHORT WAVE THIS IS IN AREA OF LESS IMPRESSIVE THERMAL/MOIST ADVECTION AND INSTABILITY. ATTENTION THEN TURNS BACK TO THE WEST AND NEBRASKA MCS AND ASSOCIATED SHORT WAVE/MCV WHICH IS EXPECTED TO APPROACH THE FA THIS AFTERNOON. MORNING CONVECTION ACROSS CENTRAL IL WILL LIKELY SLOW NORTHWARD ADVANCE OF WARM FRONT...THOUGH AMOUNT OF NORTHWARD MOVEMENT AND DESTABILIZATION SOMEWHAT UNCERTAIN BASED ON AMOUNT OF RESIDUAL CLOUD COVER ACROSS AREA BY EARLY AFTERNOON. EXPECTATION IS AGAIN THE SOUTHWESTERN HALF OF CWA WILL HAVE GREATEST POTENTIAL FOR REDEVELOPMENT OF THUNDERSTORMS. FCST MLCAPES 1000-2000 J/KG AND 0-6 KM BULK SHEAR APPROACHING 40 KTS WILL SUPPORT POTENTIAL FOR SEVERE STORMS WITH DAMAGING WIND THREAT...AGAIN WITH GREATEST POTENTIAL EXPECTED OVER SOUTHERN HALF OF CWA WITH THREAT LINGERING INTO THIS EVENING. SOME INDICATION THAT SHORT WAVE WILL TOP THE RIDGE AND MOVE EAST LATER TONIGHT...DECREASING OVERALL PRECIP/SVR THREAT OVERNIGHT. HOWEVER...POSITION OF LOW LEVEL FRONT REMAINS UNCERTAIN GIVEN COMPLEX CONVECTIVE EVOLUTION EXPECTED TODAY/THIS EVENING. THUS CONTINUED SWLY WARM/MOIST ADVECTION MAIN MAINTAIN A THUNDERSTORM THREAT THROUGH THE OVERNIGHT HOURS. LARGE SCALE HEIGHT FALLS THEN PROGGED ACROSS UPPER MIDWEST ON TUESDAY/TUESDAY NIGHT AS MAIN UPPER TROUGH MOVES EAST AND ACROSS THE REGION ON WEDNESDAY...CONTINUING THUNDERSTORM THREAT UNTIL COLD FRONT SLIDES SOUTHEAST OF THE AREA WEDNESDAY NIGHT. HAVE MADE LITTLE CHANGE TO OVERALL FORECAST BEYOND TODAY BASED ON HIGH DEGREE OF UNCERTAINTY IN CONVECTIVE TRENDS AND LOW CONFIDENCE IN MODEL SPECIFIC QPF FIELDS. WITH GENERAL LACK OF CONVECTION ACROSS MUCH OF CWA OVERNIGHT LINGERING UNCERTAINTY WITH EVOLUTION THROUGH NEXT 12-24 HOURS WILL MAINTAIN ESF ISSUANCE AND FORE GO ANY FLOOD HEADLINES FOR NOW. BUMPED TEMPS A FEW DEGS ESPECIALLY SOUTH TODAY. ALSO LOWERED MAX TEMPS A BIT THURS/FRI IN NORTHERLY FLOW AS HIGH PRESSURE SETTLES ACROSS REGION. RATZER && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 14Z... POTENTIAL DEVELOPMENT OF MORE SHOWERS AND THUNDERSTORMS AND TIMING AS NEXT IN A SERIES OF WAVES OF THUNDERSTORMS APPROACHES FROM IA. MERZLOCK //DISCUSSION...UPDATED 12Z... A FEW SHOWERS HAVE DEVELOPED DURING THE PRE DAWN HOURS OVER SW WI AND NE IL TO S CENTRAL WI AND N CENTRAL IL AS E EDGE OF MID LEVEL WARM AIR ADVECTION SHIFTED ACROSS THE MS RIVER. MID LEVEL LAPSE RATES THAT WERE NEAR MOIST ADIABATIC HAVE STEEPENED AS THE LOW LEVEL WARM AIR ADVECTION INCREASED. EXPECT SCATTERED AND THUNDERSTORMS TO MOVE THROUGH AND OFF TO THE EAST BY 15Z AS THE ASSOCIATED SHORT WAVE TROUGH AND MESO VORT MOVES INTO THE SOUTH CENTRAL GREAT LAKES REGION BY LATE MORNING. IDENTIFYING POSITION OF SURFACE WARM FRONT RATHER DIFFICULT AS HAS BECOME QUITE DIFFUSE BUT APPEARS TO BE FROM E CENTRAL IA SOUTHEASTWARD ACROSS NW AND E CENTRAL IL. AS THE WARM FRONT CONTINUES SLOWLY NORTHWARD DURING THE DAY ML CAPE VALUES CLIMB TO 3000+ J/KG OVER MUCH OF NORTHERN IL...WHILE A SHORT WAVE CURRENTLY SUSTAINING A LARGE AREA OF THUNDERSTORMS ACROSS EASTERN NE TO CONTINUE MOVING E TO THE LOCAL AREA BY LATE AFTERNOON. THE SHORT WAVE APPROACHES DURING OR SHORTLY AFTER PEAK HEATING AND EXPECT ANOTHER WAVE OF THUNDERSTORMS MOVING ACROSS THE AREA BETWEEN 21Z AND 02Z. MORE STORMS POSSIBLE LATE TONIGHT AS ANOTHER DISTURBANCE CURRENTLY OVER CO MOVES ACROSS THE PLAINS TODAY AND APPROACHES THE LOCAL AREA TONIGHT. WITH MODERATELY STRONG SW TO W MID LEVEL WINDS...SOME OF THESE STORMS MAY PRODUCE GUSTS TO 35KT AS DOWNDRAFTS BRING THESE STRONGER WINDS DOWN TO THE SURFACE. TRS //ORD AND MDW CONFIDENCE...UPDATED 14Z... HIGH CONFIDENCE THROUGH 18Z OF MAINLY VFR CIGS AND DIMINISHING TSTM POTENTIAL. MEDIUM CONFIDENCE IN REDEVELOPMENT OF CONVECTION AFTER 22Z...BUT LOW CONFIDENCE ON SPECIFIC TIMING...THOUGH RADAR AND SATLT TRENDS WOULD SUGGEST PRIME ARRIVAL TIME OF NEXT WAVE OF TS WOULD BE AFTER 02Z. MERZLOCK //OUTLOOK FOR ORD/MDW FOR 18Z TUESDAY-12Z SATURDAY...UPDATED 06Z... MONDAY NIGHT...CHANCE TSRA...OTHERWISE VFR. TUESDAY...CHANCE TSRA...OTHERWISE VFR. WEDNESDAY...CHANCE TSRA...OTHERWISE VFR. THURSDAY...VFR. FRIDAY...VFR. SATURDAY...VFR. && .MARINE... 404 AM CDT WEAK FLOW OVER THE LAKE CONTINUES THIS MORNING AS A RIDGE OF HIGH PRESSURE IS CENTERED OVER THE CENTRAL GREAT LAKES. AS THIS HIGH MOVES EAST TODAY...WINDS WILL GRADUALLY INCREASE AS THEY VEER TO THE SOUTHEAST...ALTHOUGH STILL REMAINING RELATIVELY LIGHT. A TROUGH OF LOW PRESSURE CURRENTLY OVER THE CENTRAL PLAINS WILL MOVE EAST INTO THE CENTRAL GREAT LAKES EARLY TUESDAY MORNING...WHICH WILL BEGIN TO HELP INCREASE THE WINDS AS THEY CONTINUE TO VEER MORE TO THE SOUTH/SOUTHWEST. WITH AN ACTIVE WEATHER PATTERN IN PLACE...A SERIES OF DISTURBANCES WILL MOVE THROUGH THE GREAT LAKES REGION. WITH THIS OCCURRING...WINDS WILL VARY WITH BOTH DIRECTION AND SPEED THROUGH THE FORECAST PERIOD. HIGH PRESSURE WILL FINALLY SETTLE BACK IN BY THURSDAY AND REMAIN ACROSS THE REGION THROUGH THE START OF THE WEEKEND. RODRIGUEZ && .LOT WATCHES/WARNINGS/ADVISORIES... IL...NONE. IN...NONE. LM...NONE. &&
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
935 AM CDT MON JUN 21 2010
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
221445-
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-
935 AM CDT MON JUN 21 2010 /1035 AM EDT MON JUN 21 2010/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME MAY BE SEVERE CAPABLE OF PRODUCING:
DAMAGING WIND GUSTS OVER 70 MPH.
HAIL TO THE SIZE OF NICKELS.
VERY HEAVY DOWNPOURS WHICH COULD LEAD TO FLASH FLOODING.
FREQUENT CLOUD TO GROUND LIGHTNING.
AREAS AFFECTED AND TIMING:
NON-SEVERE THUNDERSTORMS WILL END OVER EASTERN PORTIONS OF THE
OUTLOOK AREA THIS MORNING. ADDITIONAL THUNDERSTORMS...SOME
POSSIBLY SEVERE...ARE LIKELY LATER THIS AFTERNOON AND EARLY THIS
EVENING...ESPECIALLY SOUTH OF INTERSTATES 88 AND 290.
THUNDERSTORMS WILL REMAIN POSSIBLE OVER THE OUTLOOK AREA
OVERNIGHT.
DISCUSSION:
THUNDERSTORMS OVER EASTERN PORTIONS OF THE OUTLOOK AREA WILL
PUSH OUT OF THE AREA BY LATE MORNING...NO ADDITIONAL SEVERE
WEATHER IS EXPECTED WITH THESE THUNDERSTORMS.
IT NOW APPEARS AS SKIES WILL CLEAR OUT FOR A TIME TODAY AND
ALLOW THE ATMOSPHERE TO BECOME QUITE UNSTABLE...PARTICULARLY
FROM CHICAGO TO DIXON AND SOUTHWARD. ANOTHER UPPER LEVEL
DISTURBANCE OVER WESTERN IOWA IS FORECAST TO MOVE EAST INTO THE
REGION THIS AFTERNOON AND TRIGGER THE DEVELOPMENT OF ADDITIONAL
THUNDERSTORMS. GIVEN THE ANTICIPATED INSTABILITY AND STRENGTH OF
THE UPPER LEVEL DISTURBANCE THE POTENTIAL EXISTS FOR SEVERE
THUNDERSTORMS WITH DAMAGING WINDS LATER THIS AFTERNOON AND
EVENING.
ADDITIONAL THUNDERSTORM DEVELOPMENT WILL REMAIN POSSIBLE THROUGH
TONIGHT. THE AIRMASS OVER THE AREA REMAINS QUITE MOIST...SO
THERE WILL BE A POTENTIAL FOR LOCALLY HEAVY RAINFALL TOTALS
WHICH COULD TRIGGER LOCALIZED FLASH FLOODING.
FINALLY...PORTIONS OF THE UPPER ILLINOIS RIVER WILL REMAIN IN
FLOOD.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THE AREA WILL CONTINUE TO SEE PERIODIC THUNDERSTORMS TUESDAY
THROUGH WEDNESDAY NIGHT. WE WILL REMAIN IN A PATTERN THAT IS
CONDUCIVE FOR SOME OF THESE THUNDERSTORMS TO BE SEVERE WITH
DAMAGING WINDS THE PRIMARY THREAT.
THE THUNDERSTORMS WILL ALSO PRODUCE LOCALLY VERY HEAVY RAINFALL
TOTALS...WITH THE THREAT OF FLASH FLOODING INCREASING WITH EACH
SUCCESSIVE ROUND OF THUNDERSTORMS. GIVEN THE POTENTIAL FOR
REPEATED BOUTS OF HEAVY RAINFALL...THE THREAT DOES EXIST FOR
SIGNIFICANT FLOODING PROBLEMS TO DEVELOP THIS WEEK.
PORTIONS OF THE UPPER ILLINOIS RIVER WILL REMAIN IN FLOOD
THROUGH THE UPCOMING WORK WEEK.
HEAT INDICES OVER 100 DEGREES ARE POSSIBLE SATURDAY.
THERE IS ALSO A CHANCE OF THUNDERSTORMS BY SATURDAY NIGHT INTO
SUNDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL PROBABLY BE NEEDED LATER THIS AFTERNOON
AND EVENING...AND POSSIBLY AGAIN AT TIMES TUESDAY INTO
WEDNESDAY.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
LMZ740>745-221445-
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-
935 AM CDT MON JUN 21 2010
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 WILL END BY LATE MORNING...HOWEVER ADDITIONAL
THUNDERSTORMS ARE LIKELY LATE THIS AFTERNOON INTO TONIGHT. SOME OF
THOSE STORMS MAY BE SEVERE WITH WIND GUSTS OVER 50 KNOTS POSSIBLE.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
PERIODIC CHANCES OF THUNDERSTORMS WILL CONTINUE TUESDAY THROUGH
WEDNESDAY NIGHT. SOME OF THE STORMS MAY BE SEVERE WITH WIND GUSTS
OVER 50 KNOTS THE PRIMARY HAZARD.
THERE IS ANOTHER CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY.
&&
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-
870-872-874-876-878-221445-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TOW RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
935 AM CDT MON JUN 21 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...TODAY AND TONIGHT.
THUNDERSTORMS ARE LIKELY THIS MORNING OVER FAR SOUTHERN PORTIONS
OF THE LAKE. ADDITIONAL THUNDERSTORMS ARE EXPECTED LATER THIS
AFTERNOON OR EARLY THIS EVENING WITH THE CHANCE SPREADING NORTH TO
OVER THE REMAINDER OF THE LAKE TONIGHT. SOME OF THE STORMS ACROSS
SOUTHERN LAKE MICHIGAN COULD BE SEVERE TONIGHT...WITH DAMAGING
WIND GUSTS IN EXCESS OF 50 KNOTS.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS TUESDAY THROUGH
WEDNESDAY NIGHT. SOME OF THE STORMS MAY BE SEVERE ACROSS SOUTHERN
LAKE MICHIGAN...WITH WIND GUSTS OVER 50 KNOTS THE PRIMARY HAZARD.
THERE IS ALSO A CHANCE OF THUNDERSTORMS OVER MAINLY NORTHERN
PORTIONS OF THE LAKE BY FRIDAY NIGHT INTO SATURDAY...SPREADING TO
SOUTHERN PORTIONS OF THE LAKE SATURDAY.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
IZZIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
752 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0744 AM HEAVY RAIN CHATSWORTH 40.75N 88.29W
06/21/2010 M1.20 INCH LIVINGSTON IL PUBLIC
1.2 INCHES OF RAIN HAVE FALLEN OVER THE LAST HOUR
&&
SHEAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
811 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0737 AM HEAVY RAIN LA SALLE 41.34N 89.09W
06/21/2010 M1.17 INCH LA SALLE IL TRAINED SPOTTER
RAINFALL IN 53 MINUTES.
&&
CMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
813 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0803 AM HEAVY RAIN BOURBONNAIS 41.16N 87.88W
06/21/2010 M0.90 INCH KANKAKEE IL TRAINED SPOTTER
RAINFALL IN 15 MINUTES. HEAVY RAINFALL CONTINUES.
&&
CMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
825 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0818 AM HEAVY RAIN BOURBONNAIS 41.16N 87.88W
06/21/2010 M1.09 INCH KANKAKEE IL TRAINED SPOTTER
UPDATE SINCE LAST REPORT. 30 MINUTE RAINFALL TOTAL 1.09.
&&
CMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
929 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0922 AM HEAVY RAIN PORTAGE 41.59N 87.18W
06/21/2010 M1.10 INCH PORTER IN TRAINED SPOTTER
RAINFALL PAST 35 MINUTES. MINOR PONDING ON ROADS.
&&
CMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
950 AM CDT MON JUN 21 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0922 AM HEAVY RAIN BRADLEY 41.15N 87.86W
06/21/2010 E1.40 INCH KANKAKEE IL TRAINED SPOTTER
&&
CMThe Milwaukee radar (KMKX), 76 km away, was scanning. The volume nearest the first event began at 15:31 UTC.
14 thunderstorm wind, 2 tornado, 1 flash flood, 1 hail. Local standard time, as filed.
Tree limbs were blown down. A roof vent and shingles were also damaged.
A trained spotter witnessed a brief tornado with a debris cloud in an open field near U.S. 52, southwest of Melvin.
Large tree limbs were blown down, one fell on restrooms at a park.
A trained spotter observed a rain-wrapped tornado in a field. There was no damage.
Roads were closed due to water from nearby fields flowing across them.
A few trees were blown down.
A medium size tree limb was blown down on Route 173.
A large silo blew down onto an anhydrous ammonia tank, damaging a valve. The ammonia leak resulted in evacuation of several nearby residences. There was also a tree blown down on a road.
Quarter size hail was reported near Ridge Road and Theodore Street.
A tree was blown down on Petite Lake Road.
Large tree limbs were blown down with damage to two cars.
A tree was blown down across Harlem Avenue at Division.
Several tree limbs and power lines were blown down.
Numerous trees up to two feet in diameter, tree limbs and power lines were blown down in Gibson City. Some trees and tree limbs fell onto houses. A semi tanker trailer was pushed over on its side. A large grain bin under construction was knocked off its foundation. Damage to the grain bin itself was estimated at $750,000.
Several trees were blown down blocking Route 9 between Gibson City and Paxton.
A power pole was blown down across Route 49.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2010Every state in 2010This day in weather historyThe tornado archive for Illinois, 2010Warnings in Illinois, June 2010
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: 235468, 243043, 243040, 243044, 242495, 242231, 242228, 243030, 242232, 242420, 242417, 242418, 242419, 242490, 242492, 242480, 242482, 243037.