A weak trough of low pressure pushed into central Indiana as a weak upper level disturbance approached the area from the middle Mississippi River Valley. This was enough to produce some scattered convection during the evening hours of August the 8th.
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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 IND wrote it up.
A weak trough of low pressure pushed into central Indiana as a weak upper level disturbance approached the area from the middle Mississippi River Valley. This was enough to produce some scattered convection during the evening hours of August the 8th. Primarily hail reports were received from these storms and one severe wind event was observed.
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 Indianapolis, IN wrote its last area forecast discussion before the first event at Aug 8, 8:21 PM EST, 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE INDIANAPOLIS IN 921 PM EDT WED AUG 8 2012 .UPDATE... THE NEAR TERM SECTION HAS BEEN UPDATED BELOW. && .SYNOPSIS... ISSUED AT 246 PM EDT WED AUG 8 2012 A FRONTAL SYSTEM IS EXPECTED TO DROP SOUTH INTO THE AREA TONIGHT. A WAVE OF LOW PRESSURE WILL MOVE ACROSS NORTHERN INDIANA DURING THE DAY ON THURSDAY. THIS WILL DRAG A COLD FRONT THROUGH THE AREA THURSDAY AFTERNOON AND NIGHT. IN THE WAKE OF THIS FRONT...HIGH PRESSURE WILL BUILD INTO THE REGION. ANOTHER WEAK FRONTAL SYSTEM MAY AFFECT THE AREA LATE IN THE WEEKEND OR EARLY NEXT WEEK. && .NEAR TERM /TONIGHT/... ISSUED AT 920 PM EDT WED AUG 8 2012 FOR THE REMAINDER OF THE NIGHT...WITH QUASISTATIONARY BOUNDARY IN THE AREA...AND WEAK UPPER LEVEL WAVES...INCLUDING REMNANT MCV MOVING THROUGH SRN GREAT LAKES...EXPECT SCATTERED THUNDERSTORMS. COVERAGE HAS BEEN SLOW TO EXPAND THUS FAR THIS EVENING...ALTHOUGH THERE IS SOME HINT IN SREF PROBABILITIES...RAP...AND HRRR THAT EXPANSION OF COVERAGE MAY OCCUR WITH A SLIGHT INCREASE IN MID LEVEL FLOW LATE TONIGHT. CONSIDERING THIS...HAVE DEPICTED 40 TO 50 POPS WITH SCATTERED WORDING THROUGHOUT...AND POPS HIGHEST IN VICINITY OF THE BOUNDARY. ISOLATED STRONG STORM CANNOT BE RULED OUT...AND 5 PERCENT/SEE TEXT ON DAY ONE OUTLOOK PERFECTLY REASONABLE. INCREASED CLOUD COVER AND AS A RESULT...IN CONCERT WITH LATEST HOURLY NUMERICAL GUIDANCE AND OBSERVATIONAL TRENDS...BUMPED MIN TEMPS UP SLIGHTLY IN SOME PORTIONS OF THE AREA. STILL MID 60S TO AROUND 70...JUST SOME MINOR TWEAKS TO INDIVIDUAL NUMBERS. && .SHORT TERM /THURSDAY THROUGH SATURDAY/... ISSUED AT 246 PM EDT WED AUG 8 2012 MODELS INDICATE A COUPLE OF UPPER DISTURBANCES WILL AFFECT THE FORECAST AREA DURING THIS PERIOD. ONE WAVE...CURRENTLY OVER THE UPPER MISSISSIPPI VALLEY...IS EXPECTED TO MOVE THROUGH THURSDAY AFTERNOON AND EVENING. THIS WILL BE FOLLOWED BY AN UPPER LOW WHICH WILL SETTLE INTO THE GREAT LAKES BY FRIDAY AND SATURDAY. A SURFACE LOW ASSOCIATED WITH THE FIRST UPPER WAVE IS EXPECTED TO MOVE ACROSS NORTHERN INDIANA THURSDAY AFTERNOON...WHICH WILL DRAG A COLD FRONT THROUGH THE FORECAST AREA LATE THURSDAY AFTERNOON INTO THURSDAY NIGHT. THIS SETUP LOOKS TO PROVIDE THE BEST CHANCES FOR PRECIPITATION DURING THIS PERIOD. DEEP LAYER SHEAR IS INITIALLY RATHER WEAK...BUT GETS PROGRESSIVELY STRONGER TOWARDS THE LATE AFTERNOON AND EARLY EVENING HOURS ON THURSDAY. MID LEVEL LAPSE RATES ARE MARGINALLY FAVORABLE FOR SEVERE STORMS...SO THERE IS SOME POTENTIAL FOR STORM ORGANIZATION AND ATTENDANT THREAT FOR MAINLY WIND DAMAGE GIVEN THE INCREASING DEEP SHEAR. WILL CONTINUE TO MENTION POPS FOR THURSDAY AND THURSDAY NIGHT...WITH THE HIGHEST POPS AROUND FRONTAL PASSAGE...FROM MID AFTERNOON THURSDAY UNTIL ABOUT MIDNIGHT THURSDAY NIGHT. WILL KEEP A SMALL POP IN THE FORECAST FOR FRIDAY WITH THE UPPER LOW IN THE AREA. APPEARS BY SATURDAY...THE UPPER LOW WILL HAVE DRIFTED FAR ENOUGH OFF TO THE NORTHEAST TO KEEP THAT PERIOD DRY. PROGGED LOW LEVEL THICKNESSES SUGGEST THE GFS MOS HIGHS FOR THURSDAY ARE PROBABLY ABOUT 3-6 DEGREES TOO LOW. THE HIGHS ON FRIDAY LOOK BETTER...BUT MAY STILL BE A LITTLE COOL. GUIDANCE LOWS LOOK OK AT THIS POINT. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... ISSUED AT 246 PM EDT WED AUG 8 2012 MODELS HAVE LOW RAIN CHANCES AT TIMES...BUT CONSIDERING RECENT BIASES A TOTALLY DRY FORECAST BEST BET. EUROPEAN MOS AND MEX TEMPS CLOSE THROUGH PERIOD. FOR MINS...CONSALL MODEL WE INITIALIZED WITH IS ALSO CLOSE AND SEE NO REASON TO CHANGE. EVERYTHING AGREES GRADUAL WARMING THROUGH THE PERIOD. GIVEN RECENT BIASES IN WARMING SITUATIONS WILL GO A FEW DEGREES ABOVE EVEN RELATIVELY HOT CONSALL. && .AVIATION /DISCUSSION FOR 090000Z TAF ISSUANCE/... ISSUED AT 700 PM EDT WED AUG 8 2012 EXPECT SOME THUNDERSTORMS ACROSS CENTRAL INDIANA TONIGHT AND THURSDAY AS A QUASI-STATIONARY BOUNDARY COMBINES WITH UPPER WAVES AND INSTABILITY. AWIPS DISTANCE AND SPEED TOOL SUGGESTS THUNDERSTORM ACTIVITY WILL BE IN THE LAF AREA NEAR ISSUANCE TIME. WITH LIKELY POPS THERE TONIGHT...WILL GO WITH PREVAILING -TSRA FOR THE FIRST TWO HOURS OF THE TAF FOLLOWED BY 4 HOURS TEMPO -TSRA...AS RAPID REFRESH SUGGESTS ADDITIONAL ACTIVITY WILL MOVE INTO THE AREA. NEXT BEST CHANCE OF THUNDERSTORMS WILL BE AFTER 18Z TOMORROW AS AN UPPER WAVE AND DEEPER MOISTURE APPROACHES. FOR THE OTHER SITES...NOT CONFIDENT ENOUGH TO GO WITH ANYTHING MORE THAN VCTS TONIGHT WITH PROB30 GROUP AFTER 18Z THURSDAY. CONDITIONS SHOULD BE VFR OUTSIDE OF THUNDERSTORMS PER MODEL TIME SECTIONS MOISTURE PROFILE. WINDS WILL BE LIGHT TO CALM TONIGHT BEFORE BECOMING SOUTHWEST AT LESS THAN 10 KNOTS THURSDAY AS THE FRONT LIFTS NORTH OF THE TERMINALS. && .IND WATCHES/WARNINGS/ADVISORIES...NONE. && SYNOPSIS...JAS NEAR TERM...NIELD SHORT TERM...JAS LONG TERM....JK AVIATION...MK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 718 PM EDT WED AUG 8 2012 INZ021-028>031-035>049-051>057-060>065-067>072-092330- CARROLL-WARREN-TIPPECANOE-CLINTON-HOWARD-FOUNTAIN-MONTGOMERY- BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-RANDOLPH-VERMILLION-PARKE- PUTNAM-HENDRICKS-MARION-HANCOCK-HENRY-VIGO-CLAY-OWEN-MORGAN- JOHNSON-SHELBY-RUSH-SULLIVAN-GREENE-MONROE-BROWN-BARTHOLOMEW- DECATUR-KNOX-DAVIESS-MARTIN-LAWRENCE-JACKSON-JENNINGS- 718 PM EDT WED AUG 8 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TONIGHT. OUTLOOK: THUNDERSTORMS WILL BE POSSIBLE. HAZARDS: THUNDERSTORMS PRODUCING LIGHTNING...BRIEF HEAVY RAIN...GUSTY WINDS AND SMALL HAIL. TIMING: THROUGHOUT THE NIGHT. DISCUSSION: THUNDERSTORMS WILL BE POSSIBLE THROUGHOUT TONIGHT. ALTHOUGH WIDESPREAD SEVERE STORMS ARE NOT EXPECTED...AN ISOLATED STRONG TO SEVERE STORM CANNOT BE RULED OUT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. OUTLOOK: THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE THROUGH THURSDAY NIGHT...WITH THUNDERSTORMS LIKELY FROM THURSDAY AFTERNOON THROUGH LATE THURSDAY NIGHT. THERE IS A SLIGHT RISK OF SEVERE STORMS...WITH DAMAGING WINDS AND LIGHTNING THE PRIMARY THREATS. BRIEF HEAVY RAIN AND HAIL WILL ALSO BE THREATS. DISCUSSION: A FRONTAL SYSTEM WILL PUSH INTO THE AREA THURSDAY. THIS SYSTEM WILL PRODUCE THUNDERSTORMS...SOME OF WHICH MAY BE SEVERE. THE MOST FAVORABLE TIME FOR SEVERE STORMS WILL BE FROM 2 PM TO MIDNIGHT THURSDAY AFTERNOON AND EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THURSDAY AFTERNOON AND NIGHT. && MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL LOWERCASE) NIELD
The Indianapolis radar (KIND), 17 km away, was scanning. The volume nearest the first event began at 01:24 UTC.
5 hail, 1 thunderstorm wind, 1 flood. Local standard time, as filed.
Nickel to quarter sized hail was reported one mile west of the Greenwood airport.
Quarter sized hail was reported at Greenwood Mall.
Trees were down on houses in the Hope area due to damaging thunderstorm wind gusts. The power was reported out as well.
Street flooding occurred along College Avenue, between 96th and 99th Streets, due to heavy thunderstorm rainfall. The southbound lanes were impassable.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2012Every state in 2012This day in weather historyWarnings in Indiana, August 2012
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: 410330, 410331, 410332, 410337, 410333, 410335, 411348.