An isolated thunderstorm developed over Central Indiana during the late afternoon on August the 13th. This storm produced heavy rainfall over the northeast quarter of Marion County, where some localized flooding occurred.
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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.
An isolated thunderstorm developed over Central Indiana during the late afternoon on August the 13th. This storm produced heavy rainfall over the northeast quarter of Marion County, where some localized flooding occurred.
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 13, 6:07 PM EST, 1 hour 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE INDIANAPOLIS IN 707 PM EDT FRI AUG 13 2010 .UPDATE... THE AVIATION SECTION HAS BEEN UPDATED BELOW && .SYNOPSIS... AN UPPER RIDGE CONTINUES OVER THE AREA PUMPING HOT HUMID AIR INTO CENTRAL INDIANA. A COLD FRONT WILL APPROACH ON SATURDAY AND MOVE THROUGH THE AREA SATURDAY NIGHT AND SUNDAY AND BRING CHANCES FOR THUNDERSTORMS. AFTER THIS FRONT PASSES TEMPERATURES WILL BE A BIT COOLER /THOUGH STILL HIGHER THAN AVERAGE FOR THIS TIME OF YEAR/ AND DEWPOINTS SHOULD DROP SOME AS WELL. && .NEAR TERM /THIS EVENING AND TONIGHT/... FORECAST CHALLENGE IS OVERNIGHT POPS. MODELS ARE NOT HANDLING CURRENT AREAS OF CONVECTION...COMPLETELY MISSING THE SYSTEM ACROSS NORTHERN AND WESTERN ILLINOIS AND CREATING A NONEXISTENT SYSTEM OVER WESTERN AND NORTHERN KENTUCKY. THIS LENDS LOW CONFIDENCE TO ANY PARTICULAR MODEL QPF SOLUTION. THIS BEING SAID...CAN SEE SOME INDICATIONS FOR POTENTAIL FORCING OF MCS UPSTREAM IN WESTERN ILLIOIS/EASTERN IOWA/SOUTHWESTERN WISCONSIN WITH LOW LEVEL JET POINTED IN THAT DIRECTION AND SOME DECENT THETA E ADVECTION. THE BEST CHANCE OF THIS AFFECTING THE AREA IS IF IT CLIPS THE NORTHWESTERN COUNTIES. WILL KEEP A LOW CHANCE THERE AND A SLIGHT CHANCE ELSEWHERE IN CASE AN MCS DOES DEVELOP. FOR TEMPERATURES USED A MAV/MET AVERAGE BUT BUMPED IT UP A DEGREE OR TWO FOR LOWS SIMILAR TO LAST NIGHT. && .SHORT TERM /SATURDAY-SUNDAY NIGHT/... FORECAST FOCUS IS ON TEMPERATURES SATURDAY AND POPS THROUGHOUT. MODELS IN DECENT AGREEMENT ON PATTERN AND TIMING SO WILL USE A BLEND OF FIELDS. GUIDANCE HOWEVER SHOWING SOME DECENT DIFFERENCES SO USED BEST FEATURES OF BOTH AS DESCRIBED BELOW. WARMER MAV HAS BEEN DOING BETTER WITH HIGHS IN RECENT DAYS SO USED IT FOR HIGHS SIMILAR TO TODAY. COULD SEE SOME MORE CLOUDS WITH THE APPROACHING FRONT SO DID NOT BUMP UP THE MAV AS HAS BEEN NECESSARY PAST COUPLE OF DAYS. MUCH LOWER MET GUIDANCE LOOKS OUT OF TOUCH WITH 850 MB TEMPERATURES AND THICKNESSES SIMILAR TO TODAY. FOR SOME REASON MAV DEWPOINTS ARE RUNNING SEVERAL DEGREES TOO DRY WHILE MET LOOKS VERY REASONABLE. JUDGING BY BOTH CURRENT CONDITIONS AND UPSTREAM DEWPOINTS SEE NO REASON WHY DEWPOINTS WOULD FALL INTO THE 60S AND THUS USED MET NUMBERS IN THE 70S UNTIL LATE IN THE SHORT TERM AFTER FRONTAL PASSAGE. HEAT INDEX VALUES COULD BE SLIGHTLY LOWER TOMORROW THAN HEAT WARNING CRITERIA BUT WITH EXTENDED NATURE OF HEAT EVENT DANGER IS STILL HIGH SO WILL CONTINUE WITH EXCESSIVE HEAT WARNING IN THE SOUTHWEST AND CENTRAL AND ADVISORY IN THE NORTHEAST. FOR LOWS SATURDAY NIGHT USED THE WARMER MET GUIDANCE AS IT HAD A BETTER HANDLE ON THE MOISTURE AND LOOKED CLOSER TO THE WET BULB TEMPERATURES. SUNDAY USED THE WARMER MAV AS HEIGHTS AND 850 MB TEMPERATURES DO NOT DROP QUICKLY AS THE FRONT PASSES WITH THE RIDGE HOLDING PRETTY STRONG TO THE SOUTH. FOR POPS HAVE TRIED TO TIME HIGHEST POPS WITH THE TIME OF MOST DEEP LAYER MOISTURE AND FORCING. THIS BRINGS HIGHEST POPS /STILL HIGH CHANCE/ THROUGH ON SATURDAY NIGHT AS A SHORTWAVE PASSES THROUGH. STARTED CHANCE POPS ON SATURDAY AFTERNOON WITH RIDGE GETTING DEPRESSED AND DECENT INSTABILITY AVAILABLE BUT DIDN/T GO TOO HIGH AS NOT MUCH IN THE WAY OF FORCING UNTIL SATURDAY NIGHT. LATE SATURDAY NIGHT/SUNDAY MORNING THE COLD FRONT IS PROGGED TO MOVE THROUGH THE AREA AND THUS MAINTAINED CHANCE POPS ACROSS THE AREA UNTIL IT HAS MOVED THROUGH. IN A SEE TEXT FOR SEVERE FOR DAMAGING WINDS SATURDAY EVENING BUT THINK IT WOULD BE ISOLATED WITH NOT MUCH AVAILABLE IN THE WAY OF SHEAR. && .LONG TERM /MONDAY-FRIDAY/... SOME DISAGREEMENT AMONG THE MODELS ABOUT HOW MUCH THE RIDGE WILL BREAK DOWN AND WHEN/WHETHER IT BUILDS BACK OVER THE AREA. QUITE A BIT OF VARIABILITY IN THE PATTERN SHOWN IN THE ENSEMBLES AS WELL. OPERATIONAL GFS IS NOW TRENDING WARMER AT THE END OF THE WEEK AND SHOWING THE RIDGE BUILDING BACK UP ON THURSDAY AND FRIDAY SIMILAR TO THE ECMWF. EARLY TO MID WEEK THE GFS IS STRONGER WITH THE UPPER LOW AND TROF OVER THE AREA THAN EITHER THE NAM /THROUGH MONDAY NIGHT/ OR THE ECMWF AND BRINGS LOWER HEIGHTS AND THUS LOWER TEMPERATURES TO THE AREA. GIVEN THE STRENGTH OF THE RIDGE CURRENTLY WOULD FAVOR THE WEAKER TROF/STRONGER RIDGE SOLUTION SHOWN IN THE ECMWF. THEREFORE WILL BUMP TEMPERATURES UP A BIT FROM HPC. ALSO IN FAVORING THE STRONGER RIDGE WILL KEEP THE EXTENDED DRY WITH THE INTENTION OF TIMING IN ANY POTENTIAL WEAK IMPULSES AS THEY GET CLOSER. && .AVIATION.../140000Z TAFS/... MAIN CONCERN AT THIS TIME IS APPROACHING LINE OF CONVECTION MOVING THROUGH ILLINOIS. IT NO LONGER LOOKS LIKE KLAF AND KIND WILL GET AWAY WITHOUT ANY THUNDERSTORMS. SO...INSERTED A TEMPO FOR THE SAT 02-07Z TIME FRAME...THIS WILL BE NARROWED DOWN WITH FUTURE UPDATES. UNCERTAIN AS TO HOW FAR SOUTH THE LINE WILL GO...SO LEFT MENTION OF TSTORMS OUT OF KHUF AND KBMG FOR NOW...BUT THIS COULD CHANGE. VFR CONDITIONS WILL BE THE PREVAILING CATEGORY...BUT THERE COULD BE BRIEF DROPS TO MVFR WITH ANY STORMS THAT BECOME STRONG. FOG WILL THEN BE POSSIBLE AGAIN LATE TONIGHT AT KLAF/KHUF/KBMG... RESULTING IN MVRF/IFR CONDITIONS BEFORE DAYBREAK. CURRENT THINKING IS THAT SOUTHWEST WINDS OF 4-7 KTS WILL BE JUST STRONG ENOUGH TO PREVENT FOG FORMATION AT KIND. VFR CONDITIONS WILL RETURN SHORTLY AFTER DAYBREAK AGAIN TOMORROW AS FOG BURNS OFF. CONFIDENCE HAS INCREASED ENOUGH AT THIS TIME TO MENTION VCTS AT KIND/KLAF/KHUF TOMORROW AFTERNOON AS A COLD FRONT APPROACHES THE AREA. VCTS WILL BE INSERTED AT KBMG WITH NEXT TAF ISSUANCE SINCE IT FALLS OUTSIDE THE TIME FRAME OF THIS ISSUANCE. && .IND WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING UNTIL 8 PM EDT SATURDAY FOR INZ021- 028>030-035>037-043>048-051>057-060>065-067>072. HEAT ADVISORY UNTIL 8 PM EDT SATURDAY FOR INZ031-038>042-049. && SYNOPSIS...CP NEAR TERM...CP SHORT TERM...CP LONG TERM....CP AVIATION...TDUD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 329 AM EDT FRI AUG 13 2010 INZ045>048-051>057-060>065-067>072-140730- PUTNAM-HENDRICKS-MARION-HANCOCK-VIGO-CLAY-OWEN-MORGAN-JOHNSON- SHELBY-RUSH-SULLIVAN-GREENE-MONROE-BROWN-BARTHOLOMEW-DECATUR-KNOX- DAVIESS-MARTIN-LAWRENCE-JACKSON-JENNINGS- 329 AM EDT FRI AUG 13 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TODAY AND TONIGHT. AN EXCESSIVE HEAT WARNING IS IN EFFECT. HEAT INDEX READINGS WILL BE IN EXCESS OF 105 THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. AN EXCESSIVE HEAT WARNING IS IN EFFECT THROUGH 800 PM SATURDAY. HEAT INDEX READINGS WILL BE IN EXCESS OF 105 ON SATURDAY AFTERNOON AND EVENING. THERE IS A CHANCE FOR THUNDERSTORMS ON SATURDAY THROUGH SUNDAY. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME...HOWEVER LIGHTNING IS THREAT FROM ANY THUNDERSTORM. .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) INZ021-028>030-035>037-043-044-140730- CARROLL-WARREN-TIPPECANOE-CLINTON-FOUNTAIN-MONTGOMERY-BOONE- VERMILLION-PARKE- 329 AM EDT FRI AUG 13 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TODAY AND TONIGHT. AN EXCESSIVE HEAT WARNING IS IN EFFECT. HEAT INDEX READINGS WILL BE IN EXCESS OF 105 THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. AN EXCESSIVE HEAT WARNING IS IN EFFECT THROUGH 800 PM SATURDAY. HEAT INDEX READINGS WILL BE IN EXCESS OF 105 ON SATURDAY AFTERNOON AND EVENING. THERE IS A CHANCE FOR THUNDERSTORMS ON SATURDAY THROUGH SUNDAY. THERE IS A SLIGHT RISK FOR SEVERE STORMS ON SATURDAY AND SATURDAY NIGHT. THE MAIN THREAT FROM THESE STORMS WILL BE DAMAGING WIND. MORE STORMS ARE POSSIBLE ON SUNDAY. SEVERE STORMS ARE NOT EXPECTED ON SUNDAY AT THIS TIME...HOWEVER LIGHTNING IS THREAT FROM ANY THUNDERSTORM. .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) INZ031-038>042-049-140730- HOWARD-TIPTON-HAMILTON-MADISON-DELAWARE-RANDOLPH-HENRY- 329 AM EDT FRI AUG 13 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TODAY AND TONIGHT. A HEAT ADVISORY IS IN EFFECT. HEAT INDEX READINGS WILL BE BETWEEN 100 AND 104 THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. A HEAT ADVISORY IS IN EFFECT THROUGH 800 PM SATURDAY. HEAT INDEX READINGS WILL BE BETWEEN 100 AND 104 ON SATURDAY AFTERNOON AND EVENING. THERE IS A CHANCE FOR THUNDERSTORMS ON SATURDAY THROUGH SUNDAY. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME...HOWEVER LIGHTNING IS THREAT FROM ANY THUNDERSTORM. .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) PUMA
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
745 PM EDT FRI AUG 13 2010
INZ047-140030-
MARION-
745 PM EDT FRI AUG 13 2010
...STRONG THUNDERSTORM ADVISORY FOR NORTHEASTERN MARION COUNTY UNTIL
830 PM EDT...
AT 742 PM EDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM NEAR
LAWRENCE...OR 6 MILES NORTHEAST OF INDIANAPOLIS...MOVING EAST AT 5
MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.
THIS STORM WILL BE NEAR...
CASTLETON AROUND 755 PM EDT...
LAWRENCE AROUND 820 PM EDT...
GEIST RESERVOIR AROUND 825 PM EDT...
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
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 3993 8595 3988 8595 3988 8596 3974 8597
3975 8616 3993 8617
TIME...MOT...LOC 2345Z 257DEG 5KT 3983 8604
77/TDUDThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
High water was reported on roadways in and around the city of Lawrence due to thunderstorm heavy rainfall.
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, 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: 258920.