A remnant upper level disturbance left over from earlier convection helped cause new thunderstorm development during the afternoon of May 26th. Due to relatively light winds aloft the storms moved little after development which caused isolated storms over extreme southeast Nebraska to produce heavy rain.
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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 OAX wrote it up.
A remnant upper level disturbance left over from earlier convection helped cause new thunderstorm development during the afternoon of May 26th. Due to relatively light winds aloft the storms moved little after development which caused isolated storms over extreme southeast Nebraska to produce heavy rain.
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 Omaha, NE wrote its last area forecast discussion before the first event at May 26, 1:50 PM CST, 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 250 PM CDT WED MAY 26 2010 .SHORT TERM...TONIGHT THROUGH SATURDAY. UPPER RIDGE TO BUILD NEWD OVER CENTRAL PLAINS INTO SATURDAY AS MASSIVE UPPER LOW DIGS SEWD INTO CA/NV. RESULT SHOULD BE LESS CHC OF PCPN FOR THE CWA ALONG WITH MORE SUNSHINE AND ABOVE NORMAL TEMPERATURES. FOR TONIGHT...EARLY AFTN STLT IMAGERY SHOWED PSBL REMNANT MCV TRACKING ACROSS MO RIVER WITH SCT SHOWERS/TSTMS DVLPG IN TRAILING MID CLOUD DECK IN ERN NEBR AS OF 1830Z. WITH INSTABILITY AXIS/INVERTED SFC TROUGH EXTENDING NWWD ALONG MO RIVER IN SERN NEBR AND POSSIBLE WEAK 850 MB FRONT STRETCHING W TO E ACROSS ERN NEBR/WRN IA...SOME OF THIS ACTIVITY COULD LAST PAST 00Z AND THUS LINGERED SMALL POPS INTO EARLY THIS EVENING. WITH UPPER HEIGHTS BUILDING THROUGH FRIDAY THOUGH EXPECT ACTIVITY IN CWA TO DISPT THIS EVENING WITH LOSS OF HEATING AND HIGH PLAINS CONVECTION TO REMAIN S OR W OF THE CWA LATER TNGT. OTHERWISE LTL CHANGES MADE TO REST OF FORECAST IN SHORT TERM. SLIGHTLY LOWER DWPTS WORKING TWD CWA BOTH FRI AND SAT MORNINGS COULD ALLOW OF LOWS TO BE A BIT COOLER THOSE MORNINGS THAN PREVIOUSLY FORECAST. ALSO A BIT COOLER AIR AT 850 MB WAS FORECAST TO WRAP AROUND SFC RIDGE TOWARD SERN ZONES ON SAT WHICH COULD KNOCK HIGHS DOWN A FEW DEGREES THERE FROM THOSE EXPECTED FRIDAY. BUT GENERALLY LOWS AROUND 60 AND HIGHS IN MID 80S GIVE OR TAKE A FEW DEGREES WILL BRING A SUMMER-LIKE START TO HOLIDAY WEEKEND. .LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY ECM/GFS/CMC IN GENERAL AGREEMENT THAT SHORTWAVE ENERGY CROSSING THE NRN/CNTRL ROCKIES SATURDAY NIGHT...ALONG WITH ATTENDANT COLD FRONT SWEEPING SOUTH...SHOULD RESULT IN THUNDERSTORM ACTIVITY FOR A LARGE PORTION OF THE REGION. ATTM...GIVEN DEEP LYR SHEAR/MU CAPES...THREAT FOR SEVERE SHOULD BE CONFINED TO THE CNTRL HIGH PLAINS SAT NIGHT. MODELS IN GOOD AGREEMENT ADVECTING LLVL MOISTURE UP ALONG THE WRN HIGH PLAINS TO PHASE WITH PASSING SFC BNDRY WHICH SHOULD QUICKLY EXIT THE CWA BY SUNDAY AFTERNOON. DRY FCST THEREAFTER. CAA LOOKS PRETTY STOUT BUT TRANSITION TO LARGE SCALE ZONAL FLOW SHOULD HINDER ANY SIGNIFICANT THERMAL ADVECTION INTO THE CNTRL PLAINS...AND THUS ANTICIPATE TEMPS WILL BE NEAR NORMAL. & .AVIATION... TAF SITES KOFK/KOMA/KLNK 18Z TAFS VFR CONDITIONS SHOULD PREVAIL THROUGH THE PERIOD. A WEAK SHORTWAVE MOVING ACROSS THE PLAINS AND A WEAK FRONTAL BOUNDARY HAS LEAD TO SHOWER AND THUNDERSTORM DEVELOPMENT ACROSS PORTIONS OF SOUTHEAST NEBRASKA. HAVE DROPPED KLNK TO MVFR CONDITIONS AND CONTINUED TO CARRY -RA THROUGH 21Z TO ACCOUNT FOR RAINFALL AND MVFR CEILINGS THIS AFTERNOON. AS THIS SYSTEM MOVES EAST OUT OF THE AREA CEILINGS SHOULD BEGIN TO LIFT TO VFR AND CONTINUE AT ALL SITES THROUGH 18Z THURSDAY. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && SHORT TERM...CHERMOK LONG TERM... DEE AVIATION...KURTZ/ROURKE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1136 AM CDT WED MAY 26 2010 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-270645- MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT- PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON- STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER- SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE- JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON- 1136 AM CDT WED MAY 26 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS SOUTHEAST NEBRASKA AND FAR SOUTHWEST IOWA THROUGH THIS AFTERNOON. NO SEVERE STORMS ARE EXPECTED. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE FOR THUNDERSTORMS LATE SATURDAY NIGHT INTO SUNDAY AS A STRONG COLD FRONT PUSHES INTO THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT. KURTZ/ROURKE
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Almost 2.5 inches of rain fell in about a 40 minute period near Falls City. The heavy rain caused some ponding of water across a few roads in the area and at least one car briefly floated after driving into the high water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2010Every state in 2010This day in weather historyWarnings in Nebraska, May 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: 222289.