Convection developed over northeastern Illinois and moved across much of northern Indiana. Dense cloud cover much of the day prevented widespread severe weather.
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.
Convection developed over northeastern Illinois and moved across much of northern Indiana. Dense cloud cover much of the day prevented widespread severe weather. However some storms were able to produce damaging wind gusts in several locations.
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 Jul 18, 9:55 AM CST, 2 hours 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTHERN INDIANA 1155 AM EDT SUN JUL 18 2010 .AVIATION/UPDATE... MCV/STORM COMPLEX ACROSS SOUTHERN IL AND EASTERN MO WAS HAVING A MAJOR IMPACT ON AVIATION AND FCST ISSUES FOR THE FORECAST AREA. HAVE UPDATED GRIDS/FCST TO GO WITH A LATER TIMING OF STORMS TODAY. SUBSIDENCE ON THE NORTH SIDE OF THE COMPLEX WAS LIMITING STORM DEVELOPMENT. THE COMPLEX SHOULD CONTINUE TO MOVE SOUTH THIS AFTERNOON AS THE ATMOSPHERE DESTABILIZES OVER N INDIANA AND SURROUNDING AREAS. OLDER 4KM WRF RUN HAS BEEN HANDLING THIS SCENARIO WELL...AND INDICATES STORMS SHOULD DEVELOP IN THE SFC THETA E RIDGE OVER N INDIANA BY 21Z. HAVE UPDATED THE TAFS AND FORECAST IN THIS REGARD. HAVE ALSO LOWERED HIGH TEMPERATURES TODAY...ESPECIALLY OVER WEST AREAS GIVEN HIGH CLOUD CANOPY. && .PREV DISCUSSION... /ISSUED 654 AM EDT SUN JUL 18 2010/ SHORT TERM... MIDDAY SEVERE CONVECTION LARGELY DEPENDENT UPON AM CONVECTIVE TRENDS. HOWEVER...NRN BRANCH OF LLJ INTO CNTL WI TO CONT VEERING PROVIDING FOCUS FOR ELEVATED NON-SEVERE CONVECTION ACRS ECNTL WI AND CRNTLY CROSSING LK MI. DOWNWIND STEERING FLOW SHOULD CONT TO BACK SLIGHTLY AS NEW ENGLAND VORTEX CONTS TO ROTATE THROUGH ERN CAN TROF...KEEPING FOCUS LARGELY TO NORTH OF CWA...AND ALONG WITH STORMS OUTRIDING MIDLVL LAPSE RATE PLUME/GRDLY INCRSG STABILITY TOWARD DAYBREAK/SBCIN WITH TIME...SUGGESTS IR SAT TRENDS TO CONT SLOW DEMISE. MEANWHILE 35-40 KT LLJ ACRS ERN KS TO FAVOR CONTD MCS MAINTENANCE ACRS NRN MO/NE KS/SERN IA WITH SIG PLUME OF 8-9 C/KM MIDLVL LAPSE RATES FIRMLY TAPPED WITH 3000-4000 J/KG MLCAPE YET AT 08 UTC. THIS MCS TO RIDE SW OF CWA....LEAVING SRN GRTLKS PRIMED FOR STRONG SFC HEATING/DESTABILIZATION BY MIDDAY. IN ADDITION...PLUME OF SIG HIR SFC DPS IN LWR/MID 70S POOLED AHEAD OF COLD FNT FM UPR MS VLY INTO CNTL PLAINS TO ADVECT INTO CWA BY THIS AFTN IN INCRSD SWRLY LLVL FLOW. STRONG DESTABILIZATION WITH MODIFIED NAM POINT SOUNDINGS YIELDING 4000-4500 J/KG ACRS CWA AND SREF INDICATING MLCAPES GT 4000 J/KG INTO SWRN CWA. COMPARABLY SIMILAR TO LAST THURSDAY...HOWEVER WITH THIS EVENT CORE OF MUCH STRONGER WNWLY MIDLVL FLOW FURTHER SOUTH INTO LWR MI TO ENHANCE DEEP LAYER SHEAR...PROGGED BY 18 UTC IN PREFRONTAL TROF FM 45-50 KTS NORTH TO 30 KTS SWRN CWA AND 06 UTC NAM ABOUT 5 KTS LESS...THOUGH STILL APPRECIABLY MORE THAN THU. MAX DESTAB/SHEAR ENVIRON COINCIDING ABOUT TIME OF REACHING CONVECTIVE TEMPERATURE. OF NOTE MODEL DCAPE QUITE STRONG SIGNAL WITH 1500-2000 J/KG IN PREFRONTAL TROF AND IMMEDIATELY AHEAD OF SFC FNT. HOWEVER...SOME CONCERN THAT LESSER BULK SHEAR/STABILITY MAY KEEP SECONDARY CONVECTION LINE LESS PRONE TO SEVERE. SVRL DERECHO CLIMO PARAMETERS MET ALONG WITH 5H COOL POOL INTO NRN CWA AND PRONOUNCED DRY ENVIRONMENTAL AIR IN 600-400 MB LYR WITH MDPI GT 1.25/WINDEX 55-65 KTS...WITH SHEAR TO AID IN ORGANIZATION COULD SEE CLUSTERS QUICKLY DVLP INTO SERIAL TYPE DERECHO/LEWP ACRS NRN IL/NWRN IN BY MIDDAY...AND PROGRESS RAPIDLY EWD. PRECIP LOADING WITH PWAT RAPIDLY INCRS TO 1.75-2 INCHES AND MORE FAVORABLE WB0 HEIGHTS IN 11.5-12.5 KFT RANGE...FZLVL AROUND 15KFT FOR LARGE HAIL PRODUCTION IN STRONGER/ORGANIZED UPDRAFTS...THOUGH WIND BY FAR SHOULD BE LARGEST RISK TODAY. CONTD SCAT WORDING WITH UNCERTAINTIES IN OVERALL COVERAGE/MESOSCALE OUTCOMES. LESSENING TO LWR CHC POPS NW- SE OVERNIGHT. MSTR/INSTABILITY WELL RAKED OUT TO SOUTH ON MONDAY FOR DRY/COOLER LESS HUMID DAY. HIGH THETA-E RIBBON LAID OUT WEST TO EAST WITH ADDNL SHORTWAVES EMANATING FM NRN ROCKIES EMBEDDED IN RAPID ZONAL FLOW WITH CNTL ROCKIES EML PLUME ADVANCING WELL EAST INTO MID MS VLY FOR CONTD UPSTREAM CONVECTION DVLPMNT MONDAY...TRANSLATING INTO CWA MONDAY NIGHT...TIMING OF WHICH SUGGESTS A LESSER RISK OF SVR. LONG TERM... TUESDAY THROUGH SATURDAY VERY LITTLE CHANGE TO THE PREVIOUS FORECAST AS FORECAST MODEL CONSENSUS GROWS TOWARD AN ACTIVE PATTERN IN THE SOUTHERN GREAT LAKES. THE TREND CONTINUES TO BE TOWARD FLATTER MID LEVEL HEIGHTS IN THE NORTHERN CONUS...A SOLUTION THAT IS PREFERRED GIVEN THE NEGATIVE HEIGHT ANOMALY IN SE CANADA AND DOWNSTREAM RIDGE BLOCKING. TIGHT MID LEVEL HEIGHT GRADIENT INTO THE REGION THROUGH MOST OF THE PERIOD WILL OFFER FAST MID LEVEL FLOW WITH SEVERAL IMPULSES EXPECTED THROUGH THE FLOW GIVEN AN ANCHORED NW CONUS TROUGH. DEEP MOISTURE WILL BE OVER THE REGION WITH SFC DEWPOINTS EXPECTED INTO AT LEAST THE LOWER 70S MOST PLACES...SUPPORTING AMPLE INSTABILITY AHEAD OF ANY APPROACHING IMPULSE. IN ADDITION...A LINGERING STATIONARY FRONTAL BOUNDARY IS EXPECTED OVER THE REGION OR VERY NEAR...SUPPORTING THE ADDED CONVERGENCE AND BACKED SFC WINDS/WAA REGIME FAVORABLE FOR AN MCS CORRIDOR. DID ADJUST POPS IN THE PERIOD...ADJUSTING NUMBERS UP EARLY IN THE PERIOD...WITH INTRODUCTION IN LATER PERIODS. THERE STILL REMAINS SOME UNCERTAINTY PER THE DEGREE OF RIDGE FLATTENING AND THE ORIENTATION AND PLACEMENT OF THE UPPER RIDGE CENTER...NOT TO MENTION DETAILS PER THE SPEED/TIMING OF INDIVIDUAL IMPULSES. MODEL CONSENSUS DOES SUPPORT INCREASED CONFIDENCE IN THE PERIOD...AND SO FEEL POP RAISES WERE WARRANTED...ALTHOUGH DID NOT MATCH THE HIGH MEX NUMBERS GIVEN THE PERIOD AND INHERENT UNCERTAINTY. DID CONTINUE A TREND TO A DRY FORECAST AT THE END OF THE PERIOD GIVEN THE CURRENT FAVORED EJECTION OF THE WESTERN CONUS UPPER TROUGH AND ASSOCIATED DOWNSTREAM RIDGING. HOWEVER...MODEL SOLUTIONS DIVERGE BY NEXT WEEKEND WITH TROUGH EJECTION TIMING VARYING GREATLY. GIVEN THE PATTERN AND THE SEASON...A MUCH SLOWER EJECTION IN LINE WITH 12Z AND 00Z ECMWF PROGS IS FAVORED. GIVEN THE DEGREE OF FAST MID LEVEL FLOW WITH 50+ KNOTS SUPPORTING AMPLE DEEP SHEAR FOR STORM ORIGINATION...SEVERE CHANCES WILL BE ELEVATED WITH EACH IMPULSE...PARTICULARLY THE THREAT FOR DAMAGING SFC GUSTS GIVEN FAVORED STORM SCALE ORGANIZATION INTO A BOWING LINEAR CONVECTIVE COMPLEX. HEAVY RAIN WILL ALSO BR A CONCERN WITH EACH COMPLEX...AND IF SUCCESSIVE COMPLEXES TRACK OVER THE SAME AREAS...AREAL AND RIVER FLOODING MAY OCCUR. THIS WILL NEED TO BE WATCHED. DETAILS PER IMPULSE ARRIVAL TIME IS NEARLY IMPOSSIBLE ATTM GIVEN MESOSCALE CONVECTIVE INFLUENCES AND CURRENT POOR WAVE STRUCTURE DETAILS AND WILL CONTINUE TO BE VERY GENERAL WITH POP PERIODS. TEMP CONCERNS REMAIN GIVEN QUESTIONS ON THE LOCATION OF THE EXPECTED STATIONARY FRONT IN ADDITION TO TS OUTFLOW INFLUENCE AND RAINFALL. DID TREND T/S DOWN A FEW DEGREES IN EARLY PERIODS WHERE A HIGHER CONFIDENCE IN PRECIP AND CLOUDS LIES...OPTING TO DEFER ANY MAJOR CHANGES UNTIL BETTER CONFIDENCE IN SYNOPTIC DETAILS IS MET. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && SHORT TERM...MURPHY LONG TERM...JC AVIATION...SKIPPER UPDATE...SKIPPER
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NORTHERN INDIANA 954 AM EDT SUN JUL 18 2010 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-191400- 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 954 AM EDT SUN JUL 18 2010 /854 AM CDT SUN JUL 18 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OHIO... SOUTHWEST LOWER MICHIGAN AND NORTHERN INDIANA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP BY MID AFTERNOON AND PERSIST INTO THIS EVENING. SOME OF THE STORMS MAY BE SEVERE WITH DAMAGING WIND GUSTS THE PRIMARY THREAT. HAIL TO ONE INCH IN DIAMETER IS POSSIBLE WITH THE STRONGER STORMS. HEAVY DOWNPOURS WHICH MAY CAUSE LOCALIZED FLOODING ARE ALSO POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE MONDAY NIGHT THROUGH THURSDAY AS AN ACTIVE PATTERN SETTLES INTO THE GREAT LAKES REGION. THE THREAT FOR SEVERE WEATHER WILL BE ELEVATED IN THIS PERIOD...WITH DAMAGING WINDS BEING THE PRIMARY THREAT. HEAVY RAINFALL WILL ALSO BE A POSSIBILITY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED TODAY && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX LMZ043-046-191400- NEW BUFFALO MI TO ST JOSEPH MI-MICHIGAN CITY IN TO NEW BUFFALO MI- 954 AM EDT SUN JUL 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF SOUTHEASTERN LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY. SOME OF THE STORMS MAY BE SEVERE WITH WIND GUSTS TO 50 KNOTS WITH LOCALLY HIGHER WAVES NEAR STORMS THE PRIMARY THREAT. HAIL TO ONE INCH IN DIAMETER IS ALSO POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE MONDAY NIGHT THROUGH THURSDAY AS AN ACTIVE PATTERN SETTLES INTO THE GREAT LAKES REGION. THE THREAT FOR SEVERE WEATHER WILL BE ELEVATED IN THIS PERIOD...WITH DAMAGING WINDS BEING THE PRIMARY THREAT. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX/?N=MARINE
The Chicago radar (KLOT), 100 km away, was scanning. The volume nearest the first event began at 18:45 UTC.
1 thunderstorm wind. Local standard time, as filed.
Law enforcement officials reported tree limbs down onto power lines in the 6300 block of North 400 West.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2010Every state in 2010This day in weather historyWarnings in Indiana, July 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: 249091.