A weakening line of thunderstorms pushed into southern portions of central Indiana from the southwest during the 26th of April. Only isolated severe reports across southern portions of the forecast area were received.
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 weakening line of thunderstorms pushed into southern portions of central Indiana from the southwest during the 26th of April. Only isolated severe reports across southern portions of the forecast area were received.
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 Apr 25, 11:10 PM EST, 3 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE INDIANAPOLIS IN 1210 AM EDT TUE APR 26 2011 .UPDATE... AVIATION SECTION HAS BEEN UPDATED BELOW. && .SYNOPSIS... A FRONTAL SYSTEM CURRENTLY HUNG UP ACROSS THE LOCAL AREA IS EXPECTED TO OSCILLATE BACK AND FORTH THROUGH THE MIDDLE OF THE WEEK AS DISTURBANCES OF INCREASING INTENSITY MOVE THROUGH THE OHIO VALLEY. THE STRONGEST DISTURBANCE APPEARS TO MOVE THROUGH THE AREA AROUND WEDNESDAY. AFTER THE PASSAGE OF THIS LAST SYSTEM...HIGH PRESSURE EXPECTED TO BRIEFLY MOVE INTO THE AREA LATE THIS WEEK. ANOTHER FRONTAL SYSTEM MAY MOVE INTO THE AREA FROM THE PLAINS BY NEXT WEEKEND. IN THE WAKE OF THIS FRONT...HIGH PRESSURE IS EXPECTED TO BUILD INTO THE AREA EARLY NEXT WEEK. && .NEAR TERM /REST OF TONIGHT/... WAVE SEEN IN WATER VAPOR IMAGE CONTINUES TO GENERATE A LARGE AREA OF CONVECTION...NOW LOCATED ACROSS ILLINOIS AND MISSOURI. THIS LINE WILL CONTINUE TO MARCH SLOWLY EAST INTO THE FORECAST AREA TONIGHT. MESOANALYSIS SHOWS 850MB MOISTURE TRANSPORT INCREASING ACROSS THE AREA...AND PRECIPITABLE WATER VALUES REMAIN AROUND 1.5 INCHES. THUS...HEAVY RAIN REMAINS A THREAT ACROSS THE AREA...ESPECIALLY GIVEN THE RELATIVELY SLOW MOVEMENT OF THE STORMS. ONGOING FORECAST HAD THIS HANDLED WELL. ONLY CHANGED THE WORDING SO THAT IT INDICATES PERIODS OF STORMS SINCE ITS DRY ACROSS MANY AREAS AT THE MOMENT. THAT WILL CHANGE THOUGH AS THE CONVECTION MOVES IN...SO THE NEAR 100 POPS LOOK GOOD. DID HAVE TO DECREASE LOW TEMPERATURES SOME THOUGH. NORTHEAST WINDS ACROSS THE NORTHEAST FORECAST AREA HAVE ALLOWED READINGS TO DIP INTO THE MID 50S...AND THE RAIN EARLIER THIS EVENING HAS ALLOWED READINGS ACROSS THE SOUTH TO GET TO NEAR 60 IN SOME AREAS. TEMPERATURES SHOULD REMAIN STEADY OR SLOWLY RISE LATER TONIGHT THOUGH AS WARM ADVECTION INCREASES. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... LONG WAVE TROUGH EXPECTED TO GRADUALLY SHIFT EAST TOWARDS THE LOCAL AREA DURING THIS PERIOD. INDIVIDUAL DISTURBANCES ROTATING AROUND THE APPROACHING TROUGH WILL KEEP THINGS UNSETTLED THROUGH THE MIDDLE OF THE WEEK. DISTURBANCE ARRIVING LATER TONIGHT EXPECTED TO BE IN THE PROCESS OF EXITING THE FORECAST AREA DURING THE MORNING HOURS ON TUESDAY. WILL GO WITH HIGH POPS IN THE MORNING ON TUESDAY...TAPERING OFF TO CHANCE DURING THE AFTERNOON. COULD BE SOME CONVECTION DEVELOP ALONG TRAILING COLD FRONT DURING THE AFTERNOON AS AIR MASS WILL BE RATHER UNSTABLE...BUT THE EXITING UPPER WAVE AND WEAK LOW LEVEL CONVERGENCE IN THE VICINITY OF FRONT MAY SERVE TO KEEP CONVECTIVE DEVELOPMENT DOWN. SEVERE WEATHER PARAMETERS IMPRESSIVE TUESDAY AFTERNOON WITH STRONG DEEP LAYER SHEAR COUPLED WITH STEEP LAPSE RATES...ALTHOUGH AS STATED ABOVE...OTHER FACTORS ARE WORKING AGAINST CONVECTION ON TUESDAY. STRONG LIFT AHEAD OF NEXT WAVE SHOULD ALLOW FOR WIDESPREAD PRECIPITATION TO DEVELOP LATER ON TUESDAY NIGHT...WHICH WILL CONTINUE INTO WEDNESDAY NIGHT. STILL SOME VARIANCE IN THE SURFACE TRACK OF FINAL WAVE ON WEDNESDAY...BUT THE TREND IS FOR A SHIFT TO THE WEST. DEEP LAYER SHEAR OVER THE WARM SECTOR ON WEDNESDAY LOOKS STRONG WITH GOOD ALIGNMENT OF THE LOWER AND MID LEVEL JETS...SO TRACK OF THIS FINAL WAVE WILL HAVE TO BE WATCHED. LOW LEVEL THICKNESSES SUGGEST THE GFS MOS HIGHS FOR TUESDAY MAY BE A LITTLE ON THE COOL SIDE. WILL NUDGE THE GUIDANCE DOWN A COUPLE OF DEGREES. THE THICKNESSES ALSO DO NOT SUPPORT HIGHS AS WARM AS THE GFS MOS ON WEDNESDAY...BUT THESE TEMPERATURES MAY BE WITHIN REACH IF THE AREA CAN REMAIN IN THE WARM SECTOR UNTIL WEDNESDAY. FOR NOW...WILL SPLIT THE DIFFERENCE BETWEEN THE GFS AND NAM GUIDANCE. GFS MOS LOWS LOOK REASONABLE. && .LONG TERM /THURSDAY THROUGH NEXT MONDAY/... ENSEMBLE DATA SUGGEST A PROGRESSIVE UPPER PATTERN DURING THIS PERIOD. LONG WAVE TROUGH THAT WILL BE AFFECTING THE AREA DURING THE SHORT TERM IS EXPECTED TO BE IN THE PROCESS OF PASSING EAST OF THE LOCAL AREA. NEXT TROUGH LOOKS TO MOVE INTO THE GREAT LAKES AND OHIO VALLEY OVER THE WEEKEND...PUSHING EAST TOWARDS THE EAST COAST BY EARLY NEXT WEEK. WILL KEEP SOME CHANCE POPS FOR SHOWERS ON THURSDAY TO COVER ANY LINGERING ACTIVITY THAT MAY BE AROUND FROM DEPARTING SYSTEM. ENSEMBLES STILL SUGGEST LITTLE THREAT FOR PRECIPITATION FROM THURSDAY NIGHT THROUGH FRIDAY NIGHT WITH SOME UPPER RIDGING MOVING THROUGH BEFORE THE NEXT CHANCE OF PRECIPITATION ARRIVING OVER THE WEEKEND. UPCOMING WEEKEND SYSTEM LOOKS PROGRESSIVE IN NATURE...SO DRIER CONDITIONS EXPECTED BY NEXT MONDAY. && .AVIATION.../DISCUSSION FOR THE 26/06Z TAFS/... BECOMING MVFR WITH SOME AREAS OF IFR OVERNIGHT AND THEN VFR AFTER 15Z UNTIL LATE TUESDAY NIGHT. SHOWERS AND THUNDERSTORMS ALONG THE INDIANA ILLINOIS BORDER WILL SPREAD EAST ACROSS CENTRAL INDIANA NEXT SEVERAL HOURS. WILL MENTION A PERIOD OF TEMPO THUNDERSTORMS KHUF AND KIND SOUTHWARD. MODELS INDICATE THUNDERSTORMS MAY WEAKEN TOWARDS MORNING AND THEN MVFR CEILINGS IMPROVING TO VFR AFTER 15Z. WIDELY SCATTERED THUNDERSTORMS WILL POSSIBLE SO WILL KEEP CB IN TAFS. MODELS SOUNDINGS INDICATE STRONG LOW LEVEL WIND SHEAR OCCURRING OVERNIGHT AS STRONG LOW PRESSURE OVER NORTHEAST MISSOURI LIFTS TO THE NORTHEAST. WINDS WILL BECOME SOUTHERLY AND INCREASE TO 15 KNOTS WITH GUSTS TO 25 KNOTS LATE TONIGHT. BETTER MIXING WILL OCCUR AFTER 15Z AND WIND GUSTS IN EXCESS OF 30 KNOTS POSSIBLE. FINALLY WINDS SHOULD DIMINISH TUESDAY EVENING AS SURFACE LOW MOVES FARTHER NORTH AND GRADIENT DECREASES. ANOTHER AREA OF LOW PRESSURE WILL MOVE INTO THE OHIO VALLEY LATE TUESDAY NIGHT CAUSING CONDITIONS TO WORSEN RAPIDLY AFTER 270600Z. && .HYDROLOGY... THREAT FOR ROUNDS OF HEAVY RAINFALL/FLOODING APPEARS TO CONTINUE THROUGH WEDNESDAY AS PRECIPITABLE WATERS REMAIN 150-200% OF NORMAL. CONVECTIVE BOUNDARIES THAT HAVE BEEN FOCUSING THE HEAVY RAINFALL FARTHER SOUTH OVER THE PAST FEW DAYS SHOULD BEGIN TO MIX OUT WITH TIME AS A STRONGER SOUTHERLY GRADIENT DEVELOPS ACROSS THE OHIO/TENNESSEE VALLEYS...WHICH SHOULD HELP TO FOCUS THE HEAVIER RAIN FARTHER NORTH STARTING TONIGHT. THE FLASH FLOOD WATCH HAS BEEN EXTENDED IN TIME THROUGH 00Z THURSDAY TO COVER THE CONTINUING THREAT. && .IND WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH WEDNESDAY EVENING FOR INZ021-028>031- 035>049-051>057-060>065-067>072. && SYNOPSIS...JAS NEAR TERM...50 SHORT TERM...JAS LONG TERM....JAS AVIATION...JH HYDROLOGY...JAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE INDIANAPOLIS IN 625 PM EDT MON APR 25 2011 INZ021-028>031-035>049-051>057-060>065-067>072-262230- 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- 625 PM EDT MON APR 25 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH WEDNESDAY EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL BE INCREASING IN INTENSITY AND COVERAGE TONIGHT WITH UP TO TWO ADDITIONAL INCHES OF RAINFALL AND LOCALLY HIGHER AMOUNTS IN THE HEAVIER STORMS POSSIBLE. THIS MAY CAUSE LOCALIZED FLASH FLOODING....PARTICULARLY IN LOW-LYING AND POOR DRAINAGE AREAS. IT WILL ALSO RESULT IN FLOODING OR CONTINUED FLOODING OF MANY RIVERS AND STREAMS. A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING AND OVERNIGHT AS WELL...PARTICULARLY SOUTH OF INTERSTATE 70. DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES ARE ALL POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. MORE THUNDERSTORMS ARE EXPECTED THROUGH WEDNESDAY NIGHT AS A COLD FRONT REMAINS IN THE VICINITY OF CENTRAL INDIANA. REPEATED CHANCES FOR HEAVY RAINFALL WILL ALSO EXIST...WITH THE POTENTIAL FOR SIGNIFICANT FLOODING OVER A LARGE AREA ESPECIALLY SOUTH OF INTERSTATE 70. THERE IS POTENTIAL FOR ADDITIONAL SEVERE THUNDERSTORMS MAINLY TUESDAY AND TUESDAY NIGHT. DAMAGING WINDS...LARGE HAIL AND TORNADOES ARE ALL POSSIBLE. LIGHTNING IS A THREAT WITH ANY THUNDERSTORM. RAINFALL WILL FURTHER EXACERBATE ANY FLOODING ALONG MOST AREA RIVERS AND STREAMS. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO CALL IN ANY REPORTS OF FLOODING OR SEVERE WEATHER THROUGH THE NEXT SEVERAL DAYS. && 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
1231 AM EDT TUE APR 26 2011
INZ035-036-044-045-260515-
FOUNTAIN-MONTGOMERY-PARKE-PUTNAM-
1231 AM EDT TUE APR 26 2011
...STRONG THUNDERSTORM ADVISORY FOR NORTHWESTERN PUTNAM...PARKE...
SOUTHERN MONTGOMERY AND SOUTHEASTERN FOUNTAIN COUNTIES UNTIL 115 AM
EDT...
AT 1227 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 8 MILES SOUTH OF ROCKVILLE...OR 16 MILES
NORTHEAST OF TERRE HAUTE...MOVING NORTHEAST AT 50 MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN.
THIS STORM WILL BE NEAR...
JUDSON...CECIL HARDEN LAKE AND MARSHALL AROUND 1240 AM EDT...
WAVELAND AROUND 1245 AM EDT...
SHADES STATE PARK AND RUSSELLVILLE AROUND 1250 AM EDT...
ALAMO AND NEW MARKET AROUND 1255 AM EDT...
CRAWFORDSVILLE AROUND 105 AM EDT...
DARLINGTON AROUND 110 AM EDT...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. A FLASH FLOOD WATCH IS IN EFFECT. DO
NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY.
&&
LAT...LON 4014 8718 4012 8671 3988 8680 3961 8703
3962 8733
TIME...MOT...LOC 0431Z 207DEG 45KT 3970 8717
NIELDThe Evansville,IN radar (KVWX), 81 km away, was scanning. The volume nearest the first event began at 07:39 UTC.
1 thunderstorm wind, 1 hail, 1 flash flood. Local standard time, as filed.
A shed was destroyed, a camper was damaged, and a tree was uprooted on County Road 1250 East, south of U.S. Highway 50 due to damaging thunderstorm wind gusts.
U.S. Highway 31 flooded under a railroad trestle and other roads were flooded as well, due to heavy thunderstorm rainfall.
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, April 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: 299107, 299109, 299137.