A warm front lifted north across eastern Nebraska during the afternoon of April 23rd. This allowed unstable conditions to spread north across the region.
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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 warm front lifted north across eastern Nebraska during the afternoon of April 23rd. This allowed unstable conditions to spread north across the region. A large upper level low pressure system began moving onto the plains from the central Rocky Mountains during the evening of the 23rd which aided in thunderstorm development over the region. In addition...a dryline spread into southeast Nebraska during the evening of the 23rd also aiding in convective development.
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 Apr 23, 2:26 PM CST, 3 hours 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 326 PM CDT FRI APR 23 2010 .DISCUSSION... SHORT TERM...TONIGHT. WARM FRONT OVER MIDLANDS WAS BECOMING A LITTLE BETTER DEFINED AT 20Z WITH IT NEAR A OLU-OMA LINE. HOWEVER... WINDS WERE A BIT MORE SOUTHERLY WITH MORE BREAKS IN THE OVC NOTED ON AFTN STLT/SFC OBS SW OF BIE/FNB. CONVECTION AT 1930Z WAS MOSTLY CONFINED TO WRN EDGE OF LEADING WARM FRONT ON NOSE OF MID/UPPER LEVEL THERMAL TROUGH WELL OFF TO THE WEST OF THE CWA. RUC MESO ANALYSIS PAGE INDICATED BEST DESTABILIZATION WAS OCCURRING FM CONVECTION OVER SANDHILLS SEWD INTO SERN NEBR AND 17Z HIGH RESOLUTION RAPID REFRESH MODEL SHOWED POSSIBLE DEVELOPMENT SE INTO THIS AXIS OF MORE UNSTABLE AIR IN 22Z-01Z TIME FRAME. 4KM WRF ALSO DVLPD ACTIVITY FARTHER SE BUT DELAYED IT A BIT TILL 01Z BEFORE RAPIDLY FILLING IN A LINE ARCING FM NCNTRL NEBR INTO SWRN IA BY MID EVENING...SORT OF WHERE LEADING EDGE WHERE BREAKS WERE OCCURRING ON 1930Z VSBL STLT PICS. THE WARMING NEAR 700 MB NOTED ON AFTN TOP SOUNDING WAS ERODED BY GFS/NAM BY 00Z THUS WOULD EXPECT AN INCREASE IN DEVELOPMENT ESE FM NCNTRL NEBR RAPIDLY THIS EVENING AND CATEGORICAL POPS WERE MENTIONED ACROSS NRN/ERN ZONES ALONG WITH SVR THREAT THROUGH 04Z MOST AREAS...ALTHOUGH THREAT MAINLY JUST HAIL N OF BNDRY AND NOT EXACTLY SURE HOW THINGS WILL PLAY OUT SOUTH OF NEBR WARM FRONT IN SEEMINGLY LESSER PCPN CHC AREA. DRIER AIR STILL FORECAST TO WRAP INTO SWRN ZONES LATE BHND OCCLUDED FRONT...AND KEPT OVERNIGHT LOWS COOLER THAT AREA. CHERMOK MID TERM...SATURDAY THROUGH MONDAY. SURFACE LOW LOCATED ACROSS SCNTRL NEBRASKA SATURDAY MORNING WILL MOVE TO THE SOUTHERN GREAT LAKES BY DAYBREAK SUNDAY. PRECIPITATION THREAT SATURDAY WILL HAVE TWO COMPONENTS...THE WRAPAROUND PRECIP THAT WILL BE AFFECTING NORTHEAST NEBRASKA...IN THE FORM OF RAIN...AND SHOWERS THAT COULD DEVELOP ACROSS SOUTHWEST IOWA AND SOUTHEAST NEBRASKA...IN RESPONSE TO STEEP LAPSE RATES DUE TO COLD TEMPERATURES ALOFT. THIS AREA OF SHOWERS COULD EVENTUALLY DEVELOP INTO THUNDERSTORMS SATURDAY AFTERNOON OR EARLY EVENING. SCATTERED TO NUMEROUS MAY BE POSSIBLE IN THE WRAPAROUND SATURDAY NIGHT...BUT DIMINISHING THROUGH TIME INTO SUNDAY AS THE LOW FOCUSES WELL EAST OF THE REGION. SUNDAY NIGHT SHOULD BE DRY WITH WEAK RIDGING ACROSS THE REGION...IN ADVANCE OF THE NEXT TROUGH THAT MOVES DOWN FROM THE NORTHERN PLAINS...WHICH COULD TRIGGER A FEW SPOTTY SHOWERS MONDAY INTO MONDAY NIGHT. TEMPS SATURDAY SHOULD BE SOMEWHAT TRICKY...RANGING ONLY IN THE UPPER 50S IN OUR NORTHWESTERN CWFA...BUT IN THE LOWER 70S IN THE SOUTHEAST...SO TIGHT GRADIENTS COULD EXIST RESULTING IN BUST POTENTIAL. SOMEWHAT COOLISH SUNDAY AND MONDAY WITH BELOW NORMAL TEMPS. DEWALD LONG TERM...TUESDAY THROUGH FRIDAY. BEGINNING OF PERIOD WILL STILL SEE AN UPPER LEVEL TROUGH MOVING THROUGH THE REGION...WHICH COULD STILL TRIGGER SPOTTY SHOWERS MONDAY NIGHT AND TUESDAY. THE GFS IS JUST A TAD QUICKER IN MOVING THE PRECIP THREAT EAST OF THE REGION...BUT THE PREFERRED ECMWF HAS A SLIGHT SECONDARY TROUGH THAT MAY STILL BE MOVING THROUGH. TUESDAY STILL LOOKS COOLISH WITH SLIGHTLY BELOW NORMAL TEMPS IN THE LOW/MID 60S. RIDGE THEN BUILDS ACROSS THE REGION ON WEDNESDAY WITH A DECENT SOUTHERLY FLOW RETURNING TO THE REGION. THIS SHOULD PROVIDE AMPLE SUNSHINE WHICH SHOULD HELP TO BOOST TEMPS BACK INTO THE UPPER 60S AND DRY. DIGGING TROUGH THROUGH THE ROCKIES WEDNESDAY NIGHT COULD SEND A FRONT INTO THE REGION ON THURSDAY. WILL HAVE SOME POPS IN THERE DURING THIS TIME WITH A SIGNIFICANT WARMUP IN PLACE AHEAD OF THE FRONT WITH TEMPS REACHING THE LOWER/MID 70S. WILL MAINTAIN CONTINUITY WITH PRECIP CHANCES THURSDAY NIGHT AS THE FRONT MOVES THROUGH...BUT FEEL THAT THE PRECIP THREAT MAY BE /JUST/ SOUTH AND EAST OF THE CWFA BY FRIDAY. SLIGHTLY COOLER...BUT NEAR NORMAL ON FRIDAY BEHIND THE FRONT. DEWALD && .AVIATION... TAF SITES KOFK/KOMA/KLNK 18Z TAFS PER PREV AVIATION DISCUSSION BREAK IN PCPN HAD OCCURRED AT TAF SITES TO BEGIN FORECAST PD...WITH NEW CONVECTION AT 20Z CONFINED TO NEBR SANDHILLS WEST OF KOFK. ACTIVITY EXPECTED TO DEVELOP ESE INTO SERN NEBR/SWRN IA THROUGH 03Z AND THUS TEMPO GROUPS WERE INCLUDED AT ALL 3 TAF SITES FROM LATE AFTN INTO THIS EVENING. ALTHOUGH TEMPORARY MVFR CIGS POSSIBLE AT KOMA...AND AT KLNK AND KOMA WITH ANY TSTM ACTIVITY...NO CIGS OR CIGS ABOVE MVFR ARE EXPECTED AFTER MID EVENING AT THOSE 2 SITES. LOW CIGS/VSBYS THAT PLAGUED KOFK SHOULD IMPROVE THROUGH EARLY EVENING BUT CIGS COULD GO BACK DOWN AGAIN AS SFC WINDS TURN MORE EASTERLY LATER TONIGHT. AREAS OF FOG POSSIBLE IN CLEARING AREA LATE TNGT...BUT DRIER AIR THAT IS FORECAST TO WRAP INTO SYSTEM LATE TNGT COULD LIMIT THAT FROM DVLPG AT KLNK/KOMA. CHERMOK && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && DEWALD/CHERMOK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 452 PM CDT FRI APR 23 2010 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-241200- 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- 452 PM CDT FRI APR 23 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NEBRASKA AND WESTERN IOWA. .DAY ONE...TONIGHT AND SATURDAY SEVERE THUNDERSTORMS MAY STILL DEVELOP THIS EVENING ACROSS PORTIONS OF EASTERN NEBRASKA AND SOUTHWESTERN IOWA AS A WARM FRONT CONTINUES TO PUSH NORTHWARD INTO THE REGION. PRESENT INDICATIONS SUGGEST THAT THUNDERSTORMS COULD DEVELOP IN AN ARC FROM NEAR ALBION OR NELIGH SOUTHEASTWARD THROUGH WAHOO OR LINCOLN OR FALLS CITY...THEN SOUTHWARD TOWARD TOPEKA. THE THUNDERSTORMS WOULD THEN MOVE NORTH AND NORTHEAST FROM THIS AREA THROUGH THE EVENING. LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE IN ANY STORMS THAT DEVELOP THIS EVENING...BUT ANY STORM THAT DEVELOPS ON OR NEAR THE WARM FRONT COULD PRODUCE A TORNADO THROUGH MID EVENING AS WELL. OVERNIGHT... THUNDERSTORMS SHOULD SHIFT INTO NORTHEAST NEBRASKA AND WESTERN IOWA WITH SOME HAIL STILL POSSIBLE. ON SATURDAY...AS AN UPPER LEVEL LOW PRESSURE SYSTEM MOVES INTO THE AREA...THUNDERSTORMS MAY STILL BE POSSIBLE ACROSS PORTIONS OF EASTERN NEBRASKA AND SOUTHWEST IOWA IN THE AFTERNOON. DUE TO COLD TEMPERATURES ALOFT...SOME WOULD BE POSSIBLE...GENERALLY EAST OF A LINE FROM BEATRICE NEBRASKA TO ONAWA IOWA. .DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH FRIDAY ANOTHER WEATHER DISTURBANCE MOVING INTO THE REGION COULD BRING MORE THUNDERSTORMS TO THE AREA WEDNESDAY NIGHT THROUGH THURSDAY NIGHT. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION COULD BE NEEDED ACROSS PARTS
The Omaha radar (KOAX), 27 km away, was scanning. The volume nearest the first event began at 00:02 UTC.
19 hail, 1 thunderstorm wind. Local standard time, as filed.
Hail up to 1 inch in diameter was observed by off duty NWS meteorologists along Interstate 80 near exit 432.
Accompanied by 50 mph gusts.
The public reported a few hailstones reached golfball-size.
Emergency management estimated thunderstorm wind gusts reached around 60 mph southwest of Yutan.
Hail at the NWS office fell for almost 20 minutes, although there was a brief break. The hail reached 1 inch in diameter toward the end of the second episode and was accompanied by very heavy rain, with nearly 2 inches measured from the storm, and 35 mph winds.
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, April 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: 217749, 217750, 217751, 217752, 217753, 217754, 217755, 217756, 217757, 217758, 217759, 217762, 217760, 217761, 217765, 217766, 217767, 217768, 217769, 217770.