Scattered thunderstorms pushed across the southern half of Indiana during the afternoon of August the 18th. While coverage of these storms were limited, one of them did produce one report of large hail.
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.
Scattered thunderstorms pushed across the southern half of Indiana during the afternoon of August the 18th. While coverage of these storms were limited, one of them did produce one report of large hail.
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 18, 3:44 PM EST, 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE INDIANAPOLIS IN 444 PM EDT THU AUG 18 2011 .UPDATE... AVIATION SECTION UPDATED BELOW && .SYNOPSIS... A SERIES OF UPPER LEVEL DISTURBANCES IN NORTHWEST FLOW AROUND UPPER RIDGING OVER WESTERN AND CENTRAL PORTIONS OF THE NATION MAY LEAD TO PERIODS OF THUNDERSTORMS THROUGH MONDAY. HIGH PRESSURE RE- ESTABLISHES ITSELF ACROSS THE REGION THROUGH MID WEEK NEXT WEEK. && .NEAR TERM /REST THIS AFTERNOON AND TONIGHT/... AREA OF SHOWERS ACROSS MAINLY WEST/CENTRAL IL IS LOOKING DISORGANIZED AND WEAK AT THIS HOUR...SO TAPERED BACK FROM SCATTERED THUNDERSTORMS TO 30% CHANCE TO ISOLATED FOR LATER THIS AFTERNOON AND INTO TONIGHT. THIS FEATURE IS ASSOCIATED WITH A SHORTWAVE WHICH MODELS PROG TO SHIFT ACROSS CENTRAL INDIANA THROUGH THIS EVENING...ALONG A DIFFUSE FRONTAL BOUNDARY...MOVING INTO CENTRAL INDIANA AROUND 21Z. THERE IS THE POTENTIAL TO SPARK THUNDERSTORMS...THOUGH FORCING IS WEAK AND INSTABILITY IS BARELY MODERATE. THIS IS FAIRLY WELL SUPPORTED BY THE MAJORITY OF THE SHORT TERM GUIDANCE. THUNDERSTORM CHANCES AFTER SUNSET REALLY LOOK WEAK SO LEFT POPS AS IS AT SLIGHT CHANCE OVERNIGHT. DIDN/T STRAY FAR FROM PREVIOUS FORECAST LOWS OF MID TO UPPER 60S FOR TONIGHT. LOW LEVEL THICKNESSES CONTINUE TO SUPPORT THIS. && .SHORT TERM /FRIDAY THROUGH SUNDAY/... FRIDAY AND THE REST OF THIS WEEKEND WILL BE PLAGUED BY PESKY LOW CHANCES OF SCATTERED THUNDERSTORMS. THE UPSHOT IS THAT THEY DO NOT HAVE THE THREAT TO BE TO SEVERE...HOWEVER OF COURSE ANY THUNDERSTORM CAN BE DANGEROUS WITH LIGHTNING/STRONG WINDS AND HEAVY RAINFALL. STILL APPEARS THAT A SERIES OF WEAK DISTURBANCES WILL WORK THROUGH THE REGION RIDING THE UPPER RIDGE TO OUR WEST. TRIED MY BEST BUT AGREE WITH PREVIOUS FORECAST THAT TIMING THESE WAVES IS VERY DIFFICULT AND IN SOME CASES HAD TO BROAD BRUSH IN LOW CHANCE POP FOR SOME DURATIONS FRIDAY AND OVER THE WEEKEND. IN TERMS OF TEMPS...COOL BIAS REMAINS IN GUIDANCE...AND ACTUALLY VERY COOL THIS MODEL RUN. BUMPED UP MOS SEVERAL DEGREES FOR HIGHS DURING THIS PERIOD...BUT IT APPEARS LOWS WERE NOT AS AFFECTED BY ANY BIASED, SO ONLY NEEDED TO MAKE SOME MINOR TWEAKS HERE. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... COULD SEE SOME CHANCES FOR THUNDERSTORMS CONTINUE INTO SUNDAY NIGHT AND PERHAPS MONDAY DEPENDING ON HOW QUICKLY THE COLD FRONT MOVES THROUGH. BY MONDAY NIGHT THE UPPER RIDGE AND SURFACE HIGH PRESSURE WILL START BUILDING BACK INTO THE AREA. 12Z GFS/ 00Z ECMWF ARE STARTING TO SHOW POTENTIAL FOR MORE THUNDER CHANCES AROUND THE RIDGE AND ANOTHER FRONTAL PASSAGE ON WEDNESDAY/WEDNESDAY NIGHT...BUT SINCE THIS LOOKS A DECENT BIT DIFFERENT FROM PREVIOUS RUNS AND THE ENSEMBLES ARE NOT YET ON BOARD WILL KEEP REMAINDER OF THE FORECAST DRY FOR NOW. FOR TEMPERATURES WILL SEE CLOSER TO NORMAL OR EVEN A LITTLE COOLER THAN NORMAL FOR MONDAY AND TUESDAY WITH SOME REBOUNDING WEDNESDAY AND THURSDAY. && .AVIATION /DISCUSSION FOR 21Z IND TAF UPDATE/... ONGOING TAF APPEARS ON TRACK AS CONVECTION SHOULD REMAIN SW OF THE IND TAF SITE VFR CONDITIONS CONTINUE IN THE NEAR TERM. WILL MONITOR TRACK/PROGRESSION OF TSRA NEAR ATTICA AND MAY UPDATE IF IT HAVE ANY CHANCE TO THREATEN IND. /DISCUSSION FOR 181800Z TAF ISSUANCE/... SOME SCATTERED CONVECTIVE DEVELOPMENT IS POSSIBLE THIS AFTERNOON AND EVENING...WITH THE RAPID REFRESH SHOWING SOME CELLS DEVELOPING AROUND 20-22Z. TOO MUCH UNCERTAINTY IN PLACEMENT TO INCLUDE EVEN A VCTS AT THIS TIME...BUT WILL CONTINUE TO CARRY A CB AT ALL SITES FOR MUCH OF THE AFTERNOON/EARLY EVENING. WITH LIGHT TO CALM WINDS OVERNIGHT AND WEAK SUBSIDENCE EXPECT TO SEE SOME VISIBILITY RESTRICTIONS BEGINNING AROUND 6Z AT THE OUTLYING SITES AND COULD SEE SOME IFR IN THOSE BUT WILL STICK WITH MVFR AT KIND. && .IND WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...NIELD/SMF NEAR TERM...SMF SHORT TERM...SMF LONG TERM....CP AVIATION...CP/JP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 444 PM EDT THU AUG 18 2011 INZ021-028>031-035>049-051>057-060>065-067>072-192045- 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- 444 PM EDT THU AUG 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TONIGHT. SCATTERED THUNDERSTORMS WILL OCCUR LATE THIS AFTERNOON AND INTO TONIGHT. ISOLATED SEVERE STORMS ARE POSSIBLE THROUGH THIS EVENING...WITH THE MAIN THREATS DAMAGING WINDS...LARGE HAIL...AND HEAVY RAINFALL. ANY THUNDERSTORM MAY PRODUCE FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE FRIDAY THROUGH MONDAY. WHILE WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...ISOLATED SEVERE STORMS WILL BE POSSIBLE FRIDAY AND SATURDAY. IT IS TOO SOON TO DETERMINE WHETHER STORMS WILL BE SEVERE SUNDAY AND MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY OBSERVED SEVERE WEATHER THROUGH THE WEEKEND. && 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
433 PM EDT THU AUG 18 2011
INZ061-068-182100-
DAVIESS-GREENE-
433 PM EDT THU AUG 18 2011
...STRONG THUNDERSTORM ADVISORY FOR NORTHEASTERN DAVIESS AND
SOUTHWESTERN GREENE COUNTIES UNTIL 500 PM EDT...
AT 431 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES SOUTHEAST OF LINTON...OR 28 MILES
NORTHEAST OF VINCENNES...MOVING SOUTHEAST AT 5 MPH.
HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
NEWBERRY...
ELNORA...
ODON...
TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.
&&
LAT...LON 3872 8708 3885 8717 3884 8714 3887 8715
3886 8713 3889 8713 3889 8712 3890 8712
3891 8722 3892 8723 3903 8704 3890 8690
3883 8691
TIME...MOT...LOC 2033Z 323DEG 3KT 3890 8707
HOMANN/JPThe Evansville,IN radar (KVWX), 83 km away, was scanning. The volume nearest the first event began at 21:08 UTC.
1 hail. Local standard time, as filed.
Quarter sized hail fell for approximately five minutes in an area about 1.5 miles SSW of the North Daviess High School.
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: 341889.