A weak upper level system and moderate instability allowed for thunderstorms to develop. A lack of overall shear resulted in the storms producing isolated wind damage as cells collapsed or cold pools established.
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 weak upper level system and moderate instability allowed for thunderstorms to develop. A lack of overall shear resulted in the storms producing isolated wind damage as cells collapsed or cold pools established.
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 Aug 11, 1:21 PM EST, 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTHERN INDIANA 221 PM EDT WED AUG 11 2010 .SHORT TERM... MCV ASSOCD/W EARLIER DECAYED IA MCS LOCATED JUST E OF KBEH AT 18Z. WK SFC TROUGH EXTENDING SWWD FM THIS FTR COMBINED W/WEAKLY DESTABILIZING AIRMASS IN WAKE OF EARLIER OUTFLW BNDRY INDUCED CONVN YIELDING ISOLD NEW DVLPMNT OVR SW MI/NW IN AND SUSPECT ADDNL LOW CHC POTENTIAL EVIDENT FARTHER SWD AHD OF SFC TROUGH IN PROXIMITY TO TAIL END OF SFC BASED PRES FALLS. OTHERWISE UPSTREAM CONDS CONT TO STABILIZE WITHIN LARGER SCALE SUBSIDENT REGIME AS EVIDENT W/MUCH LWR SFC THETA-E WWD OVER NRN IL WWD ACRS SRN WI INTO ERN IA AND DOUBT VALIDITY OF ANY MODEL SOLUTION THAT DVLPS CONVN THERE LIKE 12Z NAM/WRF DOES AND ENDED UP DROPPING LT EVENING POPS ALTOGETHER PER UPSTREAM SFC/RADAR EVOLUTION THIS AFTN. BIGGER CONCERN LIES W/LIKELY FOG DVLPMNT ESP ALG/S OF HIGHWAY 14 WHERE APPRECIABLE RAIN FELL THIS AM. WILL HIGHLITE SRN TIER W/GREATER WEIGHTED FOG WORDING AS MOST LOCALES RECEIVED GREATER THEN 1" AND WORD IT AS PATCHY ELSEWHERE. HYDROLAPSE RATES BASED ON LWR 70S DEWPOINTS SUGGEST DENSE FOG PSBL ESP S AND SOMETHING TO MONITOR THROUGH THIS EVENING. OTHERWISE IN WAKE OF SW TROUGH LIFTING OUT THROUGH ON...LL FLW VEERS FURTHER TO NWRLY ON THU W/ADDNL LL DRYING ANTICIPATED. THERMAL CHARACTER OF INCOMING AIRMASS DIFFERS LTL FM TDY BUT W/GREATER INSOLATION XPCD AND FAIR MIXING...LOW 90S LOOK ATTAINABLE BUT DOUBT HEAT ADVISORY CRITERIA REACHABLE SAVE FAR SW GIVEN DRYING ALOFT. IN ADDN...W/LG SCALE SUBSIDENCE XPCD WILL ELIMINATE PREV POP MENTION. && .LONG TERM...FRIDAY THROUGH WEDNESDAY HOT AND HUMID WX WILL PERSIST INTO FRIDAY AS THE UPPER LEVEL RIDGE NOW SOUTH OF THE FA WILL EDGE NWD INTO THE GREAT LAKES IN RESPONSE TO A LEAD SHORTWAVE TROUGH EJECTING INTO THE NRN PLAINS. 85H TEMPS OF 20-21C COMBINED WITH DEEP MIXING/MOSTLY SUNNY SKIES IN INCREASING LOW LVL FLOW SHOULD YIELD HIGHS IN THE LOW/MID 90S ON FRIDAY. THIS COMBINED WITH DEWPOINTS NEAR 70F SHOULD ALLOW HEAT INDICES TO TOP OUT NEAR 100F BY FRIDAY AFTN. HIGHLIGHTED THIS CONCERN IN THE HWO FOR NOW. OTHERWISE...NOT EXPECTING ANY AFTN ISO/SCT CONVECTION ALONG POTENTIAL LAKE BREEZE BOUNDARY IN MODERATELY UNSTABLE ENVIRONMENT AS CAP SHOULD HOLD GIVEN WARMING ALOFT / 7H TEMPS 11-12C. UPPER LOW LOCATED ACROSS THE PAC NW THIS AFTN WILL FINALLY GET KICKED EWD AND OPEN UP INTO THE NRN PLAINS BY FRIDAY...AND INTO THE WESTERN/NRN GREAT LAKES BY SATURDAY. MEDIUM RANGE MODEL GUIDANCE HAS REMAINED CONSISTENT IN DROPPING THE ATTENDANT SFC TROUGH THROUGH THE FA LATE SATURDAY INTO SATURDAY NIGHT...CLEARING THE FA TO THE SOUTHEAST BY 12Z SUNDAY. LOTS OF UNCERTAINTY WRT CONVECTIVE CHANCES LATE FRIDAY NIGHT THROUGH SATURDAY NIGHT ALONG/AHEAD OF THIS FEATURE AS COULD SEE A PRE-FRONTAL TROUGH BRING A ROUND OF CONVECTION TO THE AREA LATE FRIDAY NIGHT/SATURDAY MORNING AND THEN SOME ADDITIONAL ACTIVITY LATE SATURDAY AFTN/NIGHT ALONG THE ACTUAL FRONT. MODELS ALSO KEEP THE MORE IMPRESSIVE 0-6KM SHEAR/FLOW JUST BEHIND THE BOUNDARY WITH CONVECTION LIKELY DEPENDENT ON THE THERMODYNAMICS. CONTINUED WITH INHERITED CHC POPS DURING THIS PERIOD. IF CONVECTION ALONG A SAT MORNING PRE-FRONTAL TROUGH DOES NOT MATERIALIZE COULD SEE ANOTHER DAY WITH HIGHS IN THE LOW/MID 90S AND HEAT INDICES EXCEEDING 100F. LESS HUMID CONDITIONS CAN BE EXPECTED ON SUNDAY AS A PRONOUNCED MID LVL DRY SLOT BUILDS IN BEHIND THE ABOVE MENTIONED SFC TROUGH. THERE MAY BE ENOUGH LINGERING BOUNDARY LAYER MOISTURE AND SFC HEATING TO FIRE ISO/SCT CONVECTION ACROSS SOUTHEASTERN PORTIONS OF THE FA ON SUN. A LOW CHC POPS COVERS THIS WELL ENOUGH FOR NOW. SUNDAY WILL BE ANOTHER HOT DAY...ALTHOUGH NOT AS HOT AS PREVIOUS DAYS...GIVEN 85H TEMPS ONLY COOLING TO 18/19C. STRONGER CAA SUNDAY NIGHT/MONDAY BEHIND A SECONDARY COLD FRONT WILL RESULT IN A NICE CHANGE TO COOLER/MORE SEASONABLE WX EARLY NEXT WEEK. BROAD UPPER TROUGH ACROSS EASTERN CANADA AND THE NC/NE US WILL LIKELY KEEP ANY TROPICAL DEPRESSION REMNANTS SOUTH AND EAST OF THE FA. OTHERWISE...MAY EVENTUALLY NEED TO ADD POPS TO EITHER TUESDAY NIGHT OR WEDNESDAY AS GFS/ECMWF/GEM ARE SHOWING ANOTHER PIECE OF ENERGY TRACKING THROUGH THE BASE OF THE TROUGH DURING THIS TIME. HELD ONTO A DRY FCST FOR NOW AS COVERAGE/CONFIDENCE IN PRECIP FOR ANY ONE PERIOD TOO LOW. && .AVIATION... VFR CONDS XPCD FOR MOST OF THE PD. HWVR MORNING HEAVY RAINFALL VCNTY KFWA AND POINTS S AND W POINT TO FOG DVLPMNT LT TONIGHT AND SWUNG FOR THE FENCES W/18Z ISSUANCE. WRF BUFFER DATA IMPLIES A FAIRLY HIGH RISK FOR DENSE FOG TWD 09-10Z AND ESP SO CONSIDERING 1"+ RAINFALL AMOUNTS THERE THUS THE TEMPO IFR GROUP FOR KFWA. OTHERWISE KEPT W/MVFR RESTRICTION AT KSBN GIVEN SPOTTY RAINFALL OVR NW IN AND GREATER DRYING SPREADING EWD OUT OF IL BFR SFC DECOUPLES THIS EVENING. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SHORT TERM...T LONG TERM...STEINWEDEL AVIATION...T
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORTHERN INDIANA 515 AM EDT WED AUG 11 2010 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-120915- LA PORTE-ST. JOSEPH IN-ELKHART-LAGRANGE-STEUBEN-NOBLE-DE KALB-STARKE- PULASKI-MARSHALL-FULTON IN-KOSCIUSKO-WHITLEY-ALLEN IN-WHITE-CASS IN- MIAMI-WABASH-HUNTINGTON-WELLS-ADAMS-GRANT-BLACKFORD-JAY-BERRIEN- CASS MI-ST. JOSEPH MI-BRANCH-HILLSDALE-WILLIAMS-FULTON OH-DEFIANCE- HENRY-PAULDING-PUTNAM-VAN WERT-ALLEN OH- INCLUDING THE CITIES OF...MICHIGAN CITY...LA PORTE...SOUTH BEND... MISHAWAKA...ELKHART...GOSHEN...LAGRANGE...TOPEKA...ANGOLA... KENDALLVILLE...LIGONIER...AUBURN...GARRETT...KNOX...NORTH JUDSON... WINAMAC...FRANCESVILLE...PLYMOUTH...BREMEN...ROCHESTER...WARSAW... WINONA LAKE...COLUMBIA CITY...SOUTH WHITLEY...FORT WAYNE... MONTICELLO...BROOKSTON...LOGANSPORT...PERU...WABASH... NORTH MANCHESTER...HUNTINGTON...BLUFFTON...OSSIAN...DECATUR... BERNE...MARION...HARTFORD CITY...MONTPELIER...PORTLAND...NILES... BENTON HARBOR...ST. JOSEPH...BUCHANAN...DOWAGIAC...CASSOPOLIS... STURGIS...THREE RIVERS...COLDWATER...HILLSDALE...BRYAN...WAUSEON... ARCHBOLD...DEFIANCE...NAPOLEON...PAULDING...ANTWERP...OTTAWA... PANDORA...VAN WERT...DELPHOS...LIMA 515 AM EDT WED AUG 11 2010 /415 AM CDT WED AUG 11 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OHIO... SOUTHWEST LOWER MICHIGAN AND NORTHERN INDIANA. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS TODAY AND TONIGHT. SEVERE WEATHER IS NOT EXPECTED BUT LOCALLY HEAVY RAINFALL IS POSSIBLE. HOT AND HUMID CONDITIONS ARE EXPECTED WITH AFTERNOON WITH HEAT INDICES FROM 95 TO 102 DEGREES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY. SEVERE WEATHER IS NOT EXPECTED. THERE IS ALSO A CHANCE FOR THUNDERSTORMS LATE FRIDAY NIGHT THROUGH SATURDAY NIGHT. SOME OF THE THUNDERSTORMS SATURDAY MAY PRODUCE DAMAGING WINDS AND HEAVY RAINFALL. HOT AND HUMID CONDITIONS ARE EXPECTED THURSDAY THROUGH SATURDAY WITH AFTERNOON WITH HEAT INDICES FROM 95 DEGREES TO 104 DEGREES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX LMZ043-046-120915- NEW BUFFALO MI TO ST JOSEPH MI-MICHIGAN CITY IN TO NEW BUFFALO MI- 515 AM EDT WED AUG 11 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF SOUTHEASTERN LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS TODAY AND TONIGHT. WIND GUSTS TO 35 KNOTS ARE POSSIBLE WITH THE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY. SEVERE WEATHER IS NOT EXPECTED. THERE IS ALSO A CHANCE FOR THUNDERSTORMS LATE FRIDAY NIGHT THROUGH SATURDAY NIGHT. SOME OF THE THUNDERSTORMS SATURDAY MAY PRODUCE STRONG WINDS. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTHERN INDIANA 1019 AM EDT WED AUG 11 2010 INZ006-007-MIZ079-080-111515- BRANCH MI-LAGRANGE IN-ST. JOSEPH MI-STEUBEN IN- 1019 AM EDT WED AUG 11 2010 AT 1014 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTH OF THREE RIVERS TO 8 MILES SOUTHWEST OF STURGIS...MOVING EAST AT 30 MPH. WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY DOWNPOURS ARE LIKELY WITH THE PASSAGE OF THESE STORMS. LOCATIONS IN THE PATH OF THESE STORMS INCLUDE... STURGIS... COLDWATER... COLON... BRONSON... UNION CITY... WASEPI... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. LAT...LON 4175 8483 4171 8558 4208 8570 4208 8484 TIME...MOT...LOC 1419Z 263DEG 26KT 4204 8557 4176 8551
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1039 AM EDT WED AUG 11 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1033 AM HEAVY RAIN 4 SE FORT WAYNE 41.04N 85.08W
08/11/2010 M1.00 INCH ALLEN IN TRAINED SPOTTER
HEAVY RAINFALL OF 1.00 INCH IN 20 MINUTES.
&&
EVENT NUMBER IWX1001022
NGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1138 AM EDT WED AUG 11 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1138 AM HEAVY RAIN MARION 40.56N 85.66W
08/11/2010 M2.25 INCH GRANT IN TRAINED SPOTTER
STORM TOTAL RAINFALL SO FAR.
&&
EVENT NUMBER IWX1001023
NGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1139 AM EDT WED AUG 11 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1139 AM HEAVY RAIN PORTLAND 40.43N 84.98W
08/11/2010 M2.70 INCH JAY IN TRAINED SPOTTER
STORM TOTAL RAINFALL.
&&
EVENT NUMBER IWX1001024
NGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1142 AM EDT WED AUG 11 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1139 AM HEAVY RAIN 4 N BLUFFTON 40.80N 85.17W
08/11/2010 M1.30 INCH WELLS IN TRAINED SPOTTER
STORM TOTAL RAINFALL SO FAR.
&&
EVENT NUMBER IWX1001025
NGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
115 PM EDT WED AUG 11 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1217 PM HEAVY RAIN PLEASANT LAKE 41.58N 85.02W
08/11/2010 M1.50 INCH STEUBEN IN TRAINED SPOTTER
STORM TOTAL RAINFALL.
&&
EVENT NUMBER IWX1001026
NGThe Northern Indiana radar (KIWX), 50 km away, was scanning. The volume nearest the first event began at 18:34 UTC.
1 thunderstorm wind. Local standard time, as filed.
A trained spotter reported a healthy two to three foot diameter fell onto two trailers at Willow Lake Campgrounds.
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, August 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: 256723.