Heavy rain producing thunderstorms wrapped around low pressure that tracked south of the region. The resultant training of echoes over far southeast Nebraska caused an isolated flash flooding report near Falls City.
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The episode as NWS OAX wrote it up.
Heavy rain producing thunderstorms wrapped around low pressure that tracked south of the region. The resultant training of echoes over far southeast Nebraska caused an isolated flash flooding report near Falls City.
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 25, 2:45 PM CST, 2 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 345 PM CDT WED MAY 25 2011 .SHORT TERM...TONIGHT. SHORT TERM CONCERNS WILL BE THE RAINFALL WINDING DOWN AND THE STRONG WINDS EARLY ON. AT 20Z...SURFACE LOW PRESSURE WAS CENTERED NEAR KANSAS CITY...WITH A STRONG PRESSURE GRADIENT OVER THE LOCAL FORECAST AREA. THIS WAS RESULTING IN WINDY CONDITIONS ACROSS THE AREA. SURFACE WINDS HAVE BEEN VARIABLE BETWEEN 15 AND 30 MPH SUSTAINED WITH GUSTS 35 TO 45 MPH. THESE STRONG WINDS WILL DECREASE IN NORTHEAST NEBRASKA AND WORK SOUTHEAST AS THE SURFACE LOW MOVES FARTHER AWAY. WILL LET THE WIND ADVISORY GO AS THOSE AREAS SHOULD SEE DECREASING WINDS LATE THIS AFTERNOON AND EARLY THIS EVENING...HOWEVER...WILL MAINTAIN STRONGER WINDS FARTHER SOUTH FOR A FEW HOURS. THE THUNDERSTORMS SHOULD MOVE OUT OF SOUTHEAST NEBRASKA AND SOME SHOWERS WILL LINGER INTO THE EVENING. WILL KEEP IT MAINLY DRY AFTER 06Z WITH DECREASING CLOUDS AND WINDS FROM THE NORTH AND LOWS IN THE 40S. MAY SEE SOME PATCHY FOG LATE TONIGHT WHERE WINDS SETTLE DOWN TO LIGHT AND VARIABLE. ZAPOTOCNY .MID TERM...LATE TONIGHT THROUGH SATURDAY. WV IMAGERY...AS WELL MOSAIC 88D...THIS AFTERNOON SHOWING WELL DEFINED CLOSED CIRCULATION CENTERED IN ERN KS. SYSTEM SFC REFLECTION WAS LOCATED IN NWRN MO WITH ASSOCIATED WARM FRONT EXTENDING FROM SRN IA TO NRN IL...AND COLD FRONT FROM SE NEB INTO CNTRL KS. CURRENT 88D RETURNS SHOWING BAND OF PCPN MAINLY ACROSS NRN IA INTO ERN NEB WRAPPING AROUND MAIN CIRCULATION. MODELS IN GOOD AGREEMENT SHOWING SHORT WAVE RIDGE PUSHING EWD THRU THE CNTRL PLAINS OVERNIGHT AND WILL GRADUALLY KICK SYSTEM/PCPN EAST OF THE CWA. LATEST HRRR/RUC13 INDICATING LINGERING PCPN PROBABLY THRU MOST OF THIS EVENING MAINLY SOUTH AND EAST...THEN DRY AFTER MIDNIGHT. AFOREMENTIONED SHORTWAVE RIDGE WILL PROVIDE DRY CONDITIONS INTO THURSDAY EVENING. SYNOPTIC SCALE LIFT THOUGH INCREASES LATE THURSDAY NIGHT...VIA DPVA/MID LYR WAA...WITH THE APPROACH OF THE NEXT SYSTEM THRU THE NRN PLAINS. BOTH NAM/GFS INSTABILITY PARAMETERS PRACTICALLY NIL...BUT NEG LYR MAX THETA-E DIFFERENCES SUGGESTING ELEVATED CONVECTION POSSIBLE INTO FRIDAY. NO SIGNIFICANT FEATURES PASSING THRU FRIDAY NIGHT OR SATURDAY WHEN LARGE SCALE FLOW TRANSITIONS TO NEAR ZONAL...THUS WILL CONTINUE DRY FCST. .LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY. GFS/ECM IN DECENT AGREEMENT UPPER LEVEL HIGH PRESSURE WILL STRENGTHEN OVER THE SERN STATE THRU THE PD AND FORCE LARGE SCALE FLOW TO TRANSITION TO AN UPPER TROF OVER THE WRN CONUS. PCPN CHANCES HEADING INTO NEXT WEEKEND FOR OUR AREA REVOLVING AROUND INTENSE LLVL THERMAL/MOIST CONVG BNDRY SETTING UP FROM ABOUT ERN IA TO WRN KS. GFS/ECM IN DECENT AGREEMENT THAT THE BNDRY WILL MOVE LITTLE UNTIL LATE SUNDAY WHEN DEEPENING SFC LOW OVER THE NEB PANH BEGINS TO LIFT NEWD WITH CLOSING UPPER LEVEL LOW. BY MONDAY MORNING THE BNDRY WILL BEGIN TO MIGRATE NWD AS A WARM FRONT INTO THE DAKOTAS/MN. THE GFS IS ADVERTISING PRECIP WATER VALUES ANYWHERE FROM 150-200% OF NORMAL DUE TO CONTINUOUS MOISTURE POOLING ALONG/SOUTH OF THE FRONT...THUS PROLONGED HEAVY RAINFALL UNTIL THE FRONT EXITS NORTH A DEFINITE POSSIBILITY. MEANWHILE ATTENDANT COLD FRONT WILL BEGIN TO SWEEP EWD INTO THE CNTRL PLAINS AND IS PROGGED OT REACH THE CWA LATE MONDAY NIGHT/TUESDAY MORNING..AND GFS/ECM SHOW AMPLE LLVL MOISTURE AVAILABLE TO TAP INTO DURING FROPA. LATEST SPC DAY 4-8 OUTLOOK NOT COMMITTING TO POINTING OUT SEVERE THREAT...BUT JUST LOOKING AT COMBINATION OF DEEP SHEAR AND MUCAPES INDICATE POSSIBLE SEVERE STORMS ON SUNDAY NIGHT AND MONDAY. OTHERWISE SHOULD BE GETTING BACK TO SEASONAL TEMPS TWD DAY 7 AS BOTH GFS/ECM ARE ADVERTISING SIGNIFICANT MEAN THKNS INCREASING OVER THE PLAINS. DEE && .AVIATION... TAF SITES KOFK/KOMA/KLNK 18Z TAFS A LARGE AREA OF SHOWERS CONTINUES OVER PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA...WITH ON AN OFF RAIN AT ALL THROUGH TAFS SITES. THIS RAIN SHOULD GRADUALLY DECREASE BTWN 23-02Z AS THE STORM SYSTEM MOVES FROM EASTERN KANSAS INTO MISSOURI. MVFR CIGS WILL IMPROVE TO VFR DURING THIS TIME. STRONG NORTH WINDS AROUND 20 TO 25KTS SUSTAINED WITH GUSTS 28 TO 32KTS WILL CONTINUE THROUGH 00-02Z BEFORE SUBSIDING TO UNDER 12KTS. OVERNIGHT SURFACE WINDS WILL BECOME LIGHT WITH SOME PATCHY FOG POSSIBLE. ZAPOTOCNY && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 429 PM CDT WED MAY 25 2011 IAZ043-055-056-069-080-091-NEZ011-012-015>018-030>034-042>045- 050>053-065-066-078-088>090-092-261100- ANTELOPE-BOONE-BURT-BUTLER-CEDAR-COLFAX-CUMING-DODGE-DOUGLAS-GAGE- HARRISON IA-JEFFERSON-JOHNSON-KNOX-LANCASTER-MADISON-MONONA IA- MONTGOMERY IA-PAGE IA-PAWNEE-PIERCE-PLATTE-POTTAWATTAMIE IA-SALINE- SARPY-SAUNDERS-SEWARD-SHELBY IA-STANTON-THURSTON-WASHINGTON-WAYNE- 429 PM CDT WED MAY 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY NIGHT THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS OVER THE OUTLOOK AREA SATURDAY NIGHT THROUGH MONDAY NIGHT. AS OF NOW...IT APPEARS THAT SEVERE THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE SUNDAY EVENING INTO MONDAY WHEN THE NEXT STORM SYSTEM CROSSES THROUGH THE CENTRAL PLAINS. MINOR TO MODERATE FLOODING OF THE MISSOURI RIVER WILL CONTINUE INTO NEXT WEEKEND...ESPECIALLY FROM OMAHA DOWNSTREAM. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION SHOULD NOT BE NEEDED THROUGH SATURDAY. IAZ079-090-NEZ067-068-091-093-261100- CASS-FREMONT IA-MILLS IA-NEMAHA-OTOE-RICHARDSON- 429 PM CDT WED MAY 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND THURSDAY MINOR TO MODERATE FLOODING IS EXPECTED TO CONTINUE ALONG THE MISSOURI RIVER FROM AROUND OMAHA DOWNSTREAM TO RULO. .DAYS TWO THROUGH SEVEN...THURSDAY NIGHT THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS OVER THE OUTLOOK AREA SATURDAY NIGHT THROUGH MONDAY NIGHT. AS OF NOW...IT APPEARS THAT SEVERE THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE SUNDAY EVENING INTO MONDAY WHEN THE NEXT STORM SYSTEM CROSSES THROUGH THE CENTRAL PLAINS. MINOR TO MODERATE FLOODING OF THE MISSOURI RIVER WILL CONTINUE INTO NEXT WEEKEND...ESPECIALLY FROM OMAHA DOWNSTREAM. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION SHOULD NOT BE NEEDED THROUGH SATURDAY.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
408 PM CDT WED MAY 25 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1107 AM FLOOD FREMONT 41.44N 96.49W
05/25/2011 DODGE NE AMATEUR RADIO
MINOR STREET FLOODING REPORTED.
&&
PEARSONThe Topeka radar (KTWX), 127 km away, was scanning. The volume nearest the first event began at 23:11 UTC.
1 flash flood. Local standard time, as filed.
Two to three inches of rain fell over much of Richardson county over several hours during the afternoon/early evening of 5/25...2.29 inches was measured at Falls City. The heavy rain caused flash flooding for a few hours across Pony Creek Road south of Falls City causing its brief closure.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2011Every state in 2011This day in weather historyWarnings in Nebraska, May 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: 293733.