A strong mid level trough and resultant increased wind field interacted with a stationary boundary and moderate instability. A long lived squall line developed across Illinois and moved east into far southern Lower Michigan.
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 IWX wrote it up.
A strong mid level trough and resultant increased wind field interacted with a stationary boundary and moderate instability. A long lived squall line developed across Illinois and moved east into far southern Lower Michigan. Numerous reports of trees, tree limbs and power lines were blown down with winds more than 70 mph at times.
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 Northern Indiana wrote its last area forecast discussion before the first event at Jun 18, 2:53 PM EST, 2 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTHERN INDIANA 353 PM EDT FRI JUN 18 2010 .SHORT TERM... TONIGHT THROUGH SATURDAY NIGHT. ...ZONE ISSUANCE WILL BE DELAYED WITH WATCH ISSUANCE ANTICIPATED... MAIN FOCUS WILL BE ON THE NEXT 6 TO 12 HOURS AS CONVECTIVE COMPLEX ACROSS EASTERN IA/WESTERN IL RACES EAST. INCREASINGLY UNSTABLE ATMOSPHERE FOUND FROM MUCH OF ILLINOIS INTO WESTERN PORTIONS OF THE FORECAST AREA. MORNING CONVECTION DID LITTLE TO STIFFLE DAYTIME HEATING AND MSTR TRANSPORT TODAY...ALLOWING CONDITIONS TO CONTINUE TO BECOME MORE PRIMED FOR SHOWERS AND THUNDERSTORMS. 18Z SOUNDING FROM KILX SHOWED A GENERALLY UNCAPPED ATMOSPHERE WITH OVER 4000 J/KG OF CAPE AND LI'S PUSHING -11 C. COORDINATION WITH SPC AND NEW SWOMCD WATCH WILL LIKELY BE ISSUED WITHIN THE NEXT HOUR OR SO. HWO WAS UPDATED EARLIER TO INCREASE THE WORDING...ESPECIALLY IN WESTERN AREAS. GRIDS NOW REFLECT LIKELY POPS FOR THE TIME BEING WITH A MENTION OF SVR WESTERN AREAS FROM 23Z TO 03Z AND EXPANDING EAST THROUGH 6Z. CONVECTION MAY END BEFORE THEN BUT CAN DEAL WITH LATER WITH UPDATES. NO CHANGES MADE BEYOND 6Z INTO TOMORROW WITH POTENTIAL FOR ADDITIONAL UPSTREAM CONVECTION IF PORTIONS OF IOWA CAN RECOVER QUICK ENOUGH. ON SATURDAY...COLD FRONT SHOULD BE MOVING THROUGH THE AREA..WITH THE GREATEST THREAT FOR SHOWERS AND STORMS CONFINED TO SE/E AREAS. WILL LET MID SHIFT FINE TUNE CHANCES AS CONVECTION THIS EVENING/OVERNIGHT MAY PLAY A ROLE IN EVOLUTION OF TOMORROWS PRECIP CHANCES. && .LONG TERM... SUNDAY THROUGH FRIDAY...MOST OF THE PERIOD WILL REMAIN ACTIVE WITH A CHANCE FOR STORMS AS A FLAT UPPER RIDGE REMAINS TO THE SOUTH AND AS WEAK UPPER LEVEL SYSTEMS MOVE RAPIDLY EAST ACROSS THE NORTHERN CONUS. KEPT TEMPERATURES ABOVE NORMAL MONDAY THROUGH WEDNESDAY AS VERY WARM SOUTH TO SOUTHWEST FLOW SHOULD PERSIST. THE OPERATIONAL GFS AND ECMWF RUNS ARE IN REASONABLE AGREEMENT WITH EACH OTHER WITH A WARM AND ACTIVE PERIOD THROUGH MUCH OF THE WEEK. ROUNDS OF STORMS ARE POSSIBLE...ESPECIALLY LATE AFTERNOON/EARLY EVENING AS A WEAK FRONT UNDULATES ACROSS THE AREA WITH PRECIPITABLE WATER VALUES 1.4 TO 1.8 INCHES. && .AVIATION... WHILE MODEST CHANGES WILL BE MADE...OVERALL IDEA WILL REMAIN INTACT FOR 18Z TAFS. MAIN SHOW WILL LIKELY BE TOWARDS OR AFTER 00Z BUT CAN'T RULE OUT CONVECTION THIS AFTERNOON. WILL LEAVE OUT ANY MENTION THROUGH 00Z FOR NOW. WILL HAVE TEMPO CONTINUE AT KSBN WITH SOME SPEED UP OF ARRIVAL TIME TO CLOSER TO 00Z BASED ON EXTRAPOLATION OF IOWA CONVECTION. FURTHER CHANGES WILL BE NEEDED AS CONVECTIVE EVOLUTION BECOMES MORE DEFINED. NO CHANGES BEYOND 12Z WITH MESOSCALE PROCESSES TONIGHT DICTATING WHAT MAY OCCUR TOMORROW. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SHORT TERM...FISHER LONG TERM...SKIPPER AVIATION...FISHER
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NORTHERN INDIANA 150 PM EDT FRI JUN 18 2010 INZ006>009-017-018-024>027-032>034-MIZ079>081-OHZ001-002-004-005-015- 016-024-025-191800- LAGRANGE-STEUBEN-NOBLE-DE KALB-WHITLEY-ALLEN IN-WABASH-HUNTINGTON- WELLS-ADAMS-GRANT-BLACKFORD-JAY-ST. JOSEPH MI-BRANCH-HILLSDALE- WILLIAMS-FULTON OH-DEFIANCE-HENRY-PAULDING-PUTNAM-VAN WERT-ALLEN OH- INCLUDING THE CITIES OF...LAGRANGE...TOPEKA...ANGOLA... KENDALLVILLE...LIGONIER...AUBURN...GARRETT...COLUMBIA CITY... SOUTH WHITLEY...FORT WAYNE...WABASH...NORTH MANCHESTER... HUNTINGTON...BLUFFTON...OSSIAN...DECATUR...BERNE...MARION... HARTFORD CITY...MONTPELIER...PORTLAND...STURGIS...THREE RIVERS... COLDWATER...HILLSDALE...BRYAN...WAUSEON...ARCHBOLD...DEFIANCE... NAPOLEON...PAULDING...ANTWERP...OTTAWA...PANDORA...VAN WERT... DELPHOS...LIMA 150 PM EDT FRI JUN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OHIO... NORTHERN INDIANA AND SOUTHWEST LOWER MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT A LINE OF THUNDERSTORMS WILL LIKELY BEGIN TO AFFECT PORTIONS OF EASTERN INDIANA AND NORTHWESTERN OHIO DURING THE EVENING HOURS. DAMAGING WINDS WILL POSE THE GREATEST THREAT FROM THIS LINE. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS EACH DAY SATURDAY THROUGH WEDNESDAY. SOME OF THE STORMS COULD BE SEVERE SOUTHEAST OF A MONTICELLO TO COLDWATER LINE ON SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATER THIS AFTERNOON AND THIS EVENING. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX INZ003>005-012>016-020-022-023-LMZ043-046-MIZ077-078-191800- LA PORTE-ST. JOSEPH IN-ELKHART-STARKE-PULASKI-MARSHALL-FULTON IN- KOSCIUSKO-WHITE-CASS IN-MIAMI-NEW BUFFALO MI TO ST JOSEPH MI- MICHIGAN CITY IN TO NEW BUFFALO MI-BERRIEN-CASS MI- INCLUDING THE CITIES OF...MICHIGAN CITY...LA PORTE...SOUTH BEND... MISHAWAKA...ELKHART...GOSHEN...KNOX...NORTH JUDSON...WINAMAC... FRANCESVILLE...PLYMOUTH...BREMEN...ROCHESTER...WARSAW... WINONA LAKE...MONTICELLO...BROOKSTON...LOGANSPORT...PERU...NILES... BENTON HARBOR...ST. JOSEPH...BUCHANAN...DOWAGIAC...CASSOPOLIS 150 PM EDT FRI JUN 18 2010 /1250 PM CDT FRI JUN 18 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN INDIANA... SOUTHWEST LOWER MICHIGAN AND THE NEARSHORE WATERS OF SOUTHEASTERN LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT A LINE OF STRONG TO SEVERE THUNDERSTORM WILL BE APPROACHING WESTERN INDIANA...SOUTHWESTERN MICHIGAN AND THE ADJACENT WATERS OF LAKE MICHIGAN BETWEEN 5 AND 7 PM EDT AND CONTINUE EASTWARD THIS EVENING. THE MAIN THREAT FROM THIS LINE WILL BE DAMAGING WINDS...POTENTIALLY AS HIGH AS 70 MPH. LARGE HAIL AND AN ISOLATED TORNADO CANNOT BE RULED OUT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS EACH DAY SATURDAY THROUGH WEDNESDAY. SOME OF THE STORMS COULD BE SEVERE SOUTHEAST OF A MONTICELLO TO COLDWATER LINE ON SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATER THIS AFTERNOON AND THIS EVENING. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX FISHER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTHERN INDIANA 602 PM EDT FRI JUN 18 2010 INZ003>006-008-012>017-020-022>024-MIZ077>079-190030- LA PORTE-ST. JOSEPH IN-ELKHART-LAGRANGE-NOBLE-STARKE-PULASKI- MARSHALL-FULTON IN-KOSCIUSKO-WHITLEY-WHITE-CASS IN-MIAMI-WABASH- BERRIEN-CASS MI-ST. JOSEPH MI- INCLUDING THE CITIES OF...MICHIGAN CITY...LA PORTE...SOUTH BEND... MISHAWAKA...NEW CARLISLE...WALKERTON...ELKHART...GOSHEN... NAPPANEE...LAGRANGE...TOPEKA...SHIPSHEWANA...KENDALLVILLE... LIGONIER...ALBION...KNOX...NORTH JUDSON...BASS LAKE...WINAMAC... FRANCESVILLE...MEDARYVILLE...PLYMOUTH...BREMEN...CULVER... ROCHESTER...AKRON...WARSAW...WINONA LAKE...SYRACUSE...MENTONE... COLUMBIA CITY...TRI-LAKES...SOUTH WHITLEY...MONTICELLO... BROOKSTON...MONON...LOGANSPORT...ROYAL CENTER...PERU... GRISSOM AFB...MEXICO...WABASH...NORTH MANCHESTER...NILES... BENTON HARBOR...ST. JOSEPH...BUCHANAN...DOWAGIAC...CASSOPOLIS... MARCELLUS...STURGIS...THREE RIVERS...WHITE PIGEON...MENDON 602 PM EDT FRI JUN 18 2010 /502 PM CDT FRI JUN 18 2010/ ...LINE OF SEVERE THUNDERSTORMS TO SWEEP THROUGH NORTHWEST INDIANA AND SOUTHWEST MICHIGAN LATE THIS AFTERNOON AND EVENING... PARTY SUNNY...HOT AND HUMID CONDITIONS ARE IN PLACE ACROSS THE AREA THIS AFTERNOON BUT DO NOT BE DECEIVED...AS A FAST MOVING LINE OF SEVERE THUNDERSTORMS WITH WIDESPREAD DAMAGING WINDS IS RACING EASTWARD OUT OF NORTHEAST ILLINOIS. CURRENT INDICATIONS PLACE THIS LINE INTO THE SOUTH BEND AREA TOWARD 630 PM EDT...GOSHEN AND ELKHART 645 PM...WARSAW...ROCHESTER AND LAGRANGE AROUND 7 PM EDT AND COLUMBIA CITY TOWARD 730 PM EDT. THIS LINE OF STORMS HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE IN THE CHICAGO AREA AND WILL APPROACH THE AREA VERY RAPIDLY LATE THIS AFTERNOON AND EVENING. THOSE WITH OUTDOOR PLANS THIS EVENING SHOULD BE PREPARED TO SEEK SHELTER QUICKLY SHOULD THREATENING WEATHER APPROACH.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
607 PM EDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0604 PM HAIL TRAIL CREEK 41.70N 86.86W
06/18/2010 E0.88 INCH LAPORTE IN TRAINED SPOTTER
&&
EVENT NUMBER IWX1000706
CEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
609 PM EDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0608 PM HAIL MICHIGAN CITY 41.71N 86.90W
06/18/2010 M1.00 INCH LAPORTE IN TRAINED SPOTTER
MEASURED 70-80 MPH. LARGE TREE BRANCHES DOWN.
&&
EVENT NUMBER IWX1000707
CEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
610 PM EDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0609 PM TSTM WND GST WANATAH 41.43N 86.90W
06/18/2010 E70 MPH LAPORTE IN TRAINED SPOTTER
TREE BRANCHES DOWN
&&
EVENT NUMBER IWX1000708
CEOPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
611 PM EDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0611 PM TSTM WND GST LA PORTE 41.61N 86.72W
06/18/2010 M64 MPH LAPORTE IN TRAINED SPOTTER
&&
EVENT NUMBER IWX1000709
CEOThe Northern Indiana radar (KIWX), 99 km away, was scanning. The volume nearest the first event began at 22:25 UTC.
19 thunderstorm wind. Local standard time, as filed.
Numerous reports of trees and power lines down.
Tree limbs down.
Nine power poles snapped.
A tree fell into a house and collapsed the bathroom wall.
Tree branches down.
Trees down.
Power was also out along M-60.
Peak wind measured at KHAI.
Fire department estimates gusts of 60 to 70 mph with numerous trees down.
Numerous trees and power lines down.
Numerous trees and power lines down.
Numerous trees and power lines down.
A 40 foot tall, 1 foot diameter tree was down.
Law enforcement reported widespread power outages and a tree that fell on a car.
Trees and power lines down.
Numerous trees down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2010Every state in 2010This day in weather historyWarnings in Michigan, 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: 235867, 235868, 235883, 235869, 235884, 235870, 235871, 235872, 235886, 235887, 235888, 235890, 235873, 235874, 235875, 235876, 235877, 235878, 235882.