A decaying band of showers and thunderstorms moved southeast out of northeast Illinois into and through central Indiana during the August 23rd afternoon hours. Before fully decaying, a couple tree damage observations were received out of Greene County.
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 IND wrote it up.
A decaying band of showers and thunderstorms moved southeast out of northeast Illinois into and through central Indiana during the August 23rd afternoon hours. Before fully decaying, a couple tree damage observations were received out of Greene County.
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 23, 3:38 PM EST, 1 hour earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE INDIANAPOLIS IN 438 PM EDT TUE AUG 23 2011 .UPDATE... THE AVIATION SECTION HAS BEEN UPDATED BELOW. && .SYNOPSIS...UPPER DISTURBANCES WILL KEEP THUNDERSTORM CHANCES IN THE FORECAST FOR THE NEXT DAY. A COLD FRONT WILL APPROACH AND MOVE THROUGH THE AREA WEDNESDAY NIGHT AND BRING CHANCES FOR SEVERE WEATHER FOR WEDNESDAY AFTERNOON AND EVENING. AFTER THAT HIGH PRESSURE WILL BUILD IN AND KEEP DRY WEATHER IN THE FORECAST THROUGH MONDAY. && .NEAR TERM /THIS AFTERNOON AND TONIGHT/... ONGOING CONVECTION IN THE NORTHWESTERN COUNTIES WILL CONTINUE TO MOVE JUST SOUTH OF EAST BUT WEAKEN AS THEY DO SO...ENTERING A LESS FAVORABLE /DRIER/ ENVIRONMENT. WILL KEEP A CHANCE GOING THROUGH THE AFTERNOON ACROSS THE WEST AND CENTRAL WITH A SLIGHT CHANCE IN THE SOUTHEAST BASED ON RADAR AND SATELLITE TRENDS. FOR THE TONIGHT PERIOD...AFTER THIS ROUND OF SHOWERS AND THUNDERSTORMS MOVE THROUGH ANOTHER MCS IS PROGGED TO FIRE OVER IOWA/ILLINOIS ACCORDING TO THE HRRR. THIS SHOULD ENTER THE FORECAST AREA AFTER 0Z AND HAVE GONE NEAR THE MAV NUMBERS FOR POPS FOR 0-6Z. EXPANDED THEM A LITTLE FURTHER SOUTH BASED ON THE REFLECTIVITY FIELDS FROM THE HRRR MOVING THE MCS THROUGH PRETTY QUICKLY. KEPT CHANCE POPS GOING THROUGH THE NIGHT FOR ANY MORE MCS ACTIVITY MOVING IN. && .SHORT TERM /WEDNESDAY THROUGH FRIDAY/... MODELS ARE SHOWING A BREAK IN THE ACTION TO START OFF WEDNESDAY...BUT NOT CONFIDENT ENOUGH IN THE TIMING TO KEEP THE MORNING DRY. WILL KEEP A LOW CHANCE GOING THROUGH 18Z AND THEN START TO RAMP THINGS UP. THE COLD FRONT WILL APPROACH AND SWING THROUGH WEDNESDAY NIGHT AND IT HAS A GOOD LOW LEVEL JET GOING THROUGH WITH IT. STEEP MID LEVEL LAPSE RATES SHOULD BE ADVECTING IN BY LATE AFTERNOON AS WELL AS SOME LOW LEVEL MOISTURE AND THIS SHOULD INCREASE THE AMOUNT OF INSTABILITY AVAILABLE /MLCAPES OF 2000-3500/. WITH SOUNDING SHOWING SOME VEERING WITH HEIGHT AS WELL...POTENTIAL IS THERE FOR SEVERE WEATHER FROM LATE AFTERNOON THROUGH FRONTAL PASSAGE WEDNESDAY NIGHT. HAVE CONFINED HIGHEST POPS OF LIKELY TO WEDNESDAY NIGHT FROM 0-6Z WHEN THE FRONT IS MOVING THROUGH. THE FRONT SHOULD BE THROUGH THE AREA BY 12Z THURSDAY WITH HIGH PRESSURE BUILDING IN. WILL KEEP FORECAST DRY FROM THEN THROUGH THE REST OF THE SHORT TERM. FOR TEMPERATURES GENERALLY USED THE WARMEST GUIDANCE AVAILABLE BASED ON RECENT VERIFICATION. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... EXTENDED PERIOD CAN STILL BE CHARACTERIZED AS DRY WITH AOB NORMAL CLIMO TEMPS (HIGHS IN THE 80S AND LOWS IN THE 60S) UNTIL TUESDAY OF NEXT WEEK AS A RIDGE REMAINS OVER THE REGION AND TROPICAL STORM IRENE MAKES HER TREK N/NE ALONG THE EASTERN SEABOARD. NEXT CHANCE FOR RAIN ARRIVES TUESDAY AS AN UPPER TROUGH FROM THE NORTHERN PLAINS SWINGS THROUGH THE REGION. && .AVIATION /DISCUSSION FOR THE 232100Z TAF UPDATES/... HAD TO ADD TEMPO THUNDERSTORM GROUPS FOR THE NEXT FEW HOURS AT HUF AND BMG BASED ON RADAR TRENDS AND JUST SHOWERS WITH CB'S AT IND AND LAF. ALSO TEMPO VISIBILITIES IN THE ACTIVITY MVFR OR POSSIBLY IFR. PREVIOUS DISCUSSION FOLLOWS... A MIXTURE OF DIFFERENT FLIGHT CATEGORIES EXPECTED THIS FORECAST PERIOD. RAPID REFRESH CONTINUES TO BE THE ONLY SHORT TERM MODEL SHOWING THE ACTIVITY OVER NE IL/FAR NW IN MAKING IT TO CENTRAL INDIANA BY APPROX 20Z THIS AFTERNOON. HAVE OPTED TO INCLUDE MENTION OF THIS LINE IN THE FORM OF THUNDERSTORMS AND SHOWERS ALONG WITH CB GROUPS FOR THE KIND AND KLAF TAFS. AS THIS LINE ENTERS A MORE STABLE ENVIRONMENT WOULD EXPECT IT TO WEAKEN SIGNIFICANTLY BEFORE REACHING THE OTHER TERMINALS. /AS IT IS ALREADY SHOWING SIGNS OF WEAKENING./ BETTER CHANCES FOR RAIN COME THIS EVENING AND OVERNIGHT...AND THEN AGAIN WED NIGHT WITH COLD FRONTAL PASSAGE. HAVE INDICATED IN TAFS A ROUGH TIMING FOR SHOWERS AND POSSIBLY A FEW TSTMS /USING CB GROUPS/ OVERNIGHT WITH KLAF WITH FIRST TO BE IMPACTED AND BMG THE LAST AS THE FEATURE MOVES FROM NW TO SE. A BRIEF BREAK IN THE ACTION IS EXPECT TOMORROW BEFORE THE MAIN FRONT COMES MOVING THROUGH WED NIGHT BRINGING ADDITIONAL CHANCES FOR RAIN AND TSTMS. && .IND WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...CP NEAR TERM...CP SHORT TERM...CP LONG TERM....SMF AVIATION...SMF/MK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 1045 AM EDT TUE AUG 23 2011 INZ021-028>031-035>049-051>057-060-241445- 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- 1045 AM EDT TUE AUG 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TODAY AND TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND TONIGHT. THE MAIN THREATS FROM THESE STORMS WILL BE DANGEROUS CLOUD TO GROUND LIGHTNING...GUSTY WINDS AND HEAVY RAINFALL. WHILE WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...AN ISOLATED SEVERE STORM WITH DAMAGING WINDS IS POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE FOR THUNDERSTORMS ON WEDNESDAY AND THUNDERSTORMS WILL BECOME LIKELY BY WEDNESDAY NIGHT AS A COLD FRONT MOVES INTO OUR REGION. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE WEDNESDAY AFTERNOON AND EARLY WEDNESDAY NIGHT WITH THE MAIN THREATS BEING DAMAGING WINDS AND LARGE HAIL. DRY WEATHER WILL BE THE RULE THURSDAY THROUGH SUNDAY. BUT THERE IS A CHANCE OF THUNDERSTORMS AGAIN BY NEXT MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE LATE WEDNESDAY AFTERNOON INTO WEDNESDAY NIGHT. && MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL LOWERCASE) INZ061>065-067>072-241445- GREENE-MONROE-BROWN-BARTHOLOMEW-DECATUR-KNOX-DAVIESS-MARTIN- LAWRENCE-JACKSON-JENNINGS- 1045 AM EDT TUE AUG 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TODAY AND TONIGHT. THERE IS A CHANCE FOR THUNDERSTORMS THIS AFTERNOON AND TONIGHT. THE MAIN THREATS WITH THESE STORMS WILL BE DANGEROUS CLOUD TO GROUND LIGHTNING...HEAVY RAIN...AND GUSTY WINDS. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THUNDERSTORMS ARE POSSIBLE WEDNESDAY AND WEDNESDAY NIGHT. SOME MAY PRODUCE GUSTY WINDS...HEAVY RAINFALL AND DANGEROUS CLOUD TO GROUND LIGHTNING. HOWEVER WE ARE NOT EXPECTING ANY OUTBREAKS OF SEVERE WEATHER AT THIS TIME ACROSS THE SOUTHERN PORTIONS OF CENTRAL INDIANA. DRY WEATHER WILL BE THE RULE THURSDAY THROUGH SUNDAY. BUT THERE IS A CHANCE OF THUNDERSTORMS AGAIN BY NEXT MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. && MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL LOWERCASE)
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE INDIANAPOLIS IN 122 PM EDT TUE AUG 23 2011 INZ028-035-231745- FOUNTAIN-WARREN- 122 PM EDT TUE AUG 23 2011 AT 120 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 7 MILES NORTHWEST OF WILLIAMSPORT...AND MOVING SOUTHEAST AT 40 MPH. * THE THUNDERSTORM WILL BE NEAR... WILLIAMSPORT AROUND 130 PM EDT... ATTICA AROUND 135 PM EDT... NEWTOWN AND MELLOTT AROUND 145 PM EDT... 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 THIS STORM HAS PASSED. DRT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE INDIANAPOLIS IN 128 PM EDT TUE AUG 23 2011 INZ028-035-231800- FOUNTAIN-WARREN- 128 PM EDT TUE AUG 23 2011 AT 121 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 7 MILES NORTHEAST OF DANVILLE...AND MOVING EAST AT 25 MPH. * THE THUNDERSTORM WILL BE NEAR... COVINGTON AROUND 140 PM EDT... VEEDERSBURG AROUND 155 PM EDT... 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 THIS STORM HAS PASSED. DRT
The Indianapolis radar (KIND), 92 km away, was scanning. The volume nearest the first event began at 21:36 UTC.
2 thunderstorm wind. Local standard time, as filed.
A tree was downed, along State Route 54, due to damaging thunderstorm wind gusts.
A few three and one quarter inch diameter trees were reported down due to thunderstorm wind gusts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2011Every state in 2011This day in weather historyWarnings in Indiana, August 2011
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: 343101, 343116.