Thunderstorms developed north of a weak front in north central Nebraska during the late afternoon of 8/7. The storms raced across northeast Nebraska as a bowing line producing at least 1 report of strong winds.
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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.
Thunderstorms developed north of a weak front in north central Nebraska during the late afternoon of 8/7. The storms raced across northeast Nebraska as a bowing line producing at least 1 report of strong winds.
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 Aug 7, 2:26 PM CST, 7 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 326 PM CDT SUN AUG 7 2011 .SHORT TERM...TONIGHT CHANGES MADE TO THE LOW TEMPERATURE TONIGHT WERE MERELY COSMETIC. SHOULD SEE THE MERCURY DIP INTO THE 60S TO LOW 70S OVERNIGHT GIVEN THE SLIGHTLY DRIER AIRMASS IN PLACE ACROSS THE CWA. DID NUDGE POPS UP TO LIKELY ACROSS THE SOUTHERN TWO-THIRDS OF THE CWA /OUT WEST FIRST...THEN LIKELYS SPREAD EASTWARD LATE/ FOR TONIGHT GIVEN THE UPPER LEVEL SHORT-WAVE OR WAVES SHOWING UP IN WATER VAPOR IMAGERY THIS AFTERNOON. MORE THAN ONE MID-LEVEL IMPULSE COULD BE ARGUED TO EXIST HEADING EAST OFF THE CENTRAL AND NORTHERN HIGH PLAINS. THE MOST CLEARLY IDENTIFIABLE S/W TROF APPEARS TO BE STRADDLING THE WYOMING/MONTANA BORDER WITH ANOTHER WAVE HEADING INTO THE NEBRASKA PANHANDLE. PLENTY OF LOW LEVEL MOISTURE/INSTABILITY AND STRONG 0-6KM SHEAR /40 TO 50 KNOTS/ WILL BE IN PLACE THROUGH EARLY THIS EVENING. MODELS ARE ALSO PROGGING A LOW LEVEL JET TO NOSE UP INTO THE CWA OVERNIGHT. ALREADY SEEING SOME INITIAL CONVECTIVE CELLS DEVELOPING ACROSS PORTIONS OF WESTERN NEBRASKA AND WESTERN SOUTH DAKOTA. THE CONV DAY ONE OUTLOOK STILL HAS THE SWRN HALF OF THE CWA IN A SLIGHT RISK FOR SVR WX. THE LATEST DAY ONE EXCESSIVE RAINFALL OUTLOOK HIGHLIGHTS THE SOUTHERN THIRD OF FORECAST ZONES. WX GRIDS HAVE T+ AND RW+ MENTIONED FOR THE TONIGHT PERIOD. WILL PROLLY HAVE TO WAIT UNTIL AFTER 00Z TO SEE THUNDER APPROACHING THIS CWA. && .LONG TERM...MONDAY THROUGH SUNDAY AS THUNDERSTORM COMPLEX MOVES SOUTHEAST OF THE AREA...THERE WILL BE A DRY PERIOD DURING THE LATE MORNING/EARLY AFTERNOON HOURS. HOWEVER...THE NEXT COLD FRONT WILL MOVE INTO THE REGION LATE MONDAY AFTERNOON INTO THE OVERNIGHT HOURS. THIS WILL BRING THUNDERSTORM CHANCES BACK INTO THE FORECAST...WITH THE HIGHEST CHANCES ACROSS THE IOWA ZONES. HIGH PRESSURE THEN MOVES INTO THE REGION...WITH A DRY PERIOD FOR MUCH OF TUESDAY. AS THE HIGH MOVES SOUTHEAST...ANOTHER MCS WILL DEVELOP ACROSS WESTERN NEBRASKA AND MOVE SOUTHEAST. WILL CONTINUE CURRENT THINKING OF HIGHEST POPS ACROSS THE NEBRASKA ZONES. FOR THE REST OF THE EXTENDED...FAST NORTHWEST FLOW ALOFT WILL KEEP UNSETTLED WEATHER ACROSS THE REGION. TEMPERATURES WILL BE AROUND NORMAL...OR A COUPLE OF DEGREES COOLER. && .AVIATION... TAF SITES KOFK/KOMA/KLNK 18Z TAFS STILL DEALING WITH SOME DISSIPATING CONVECTIVE CIRRUS BLOW-OFF FROM THUNDERSTORMS EARLIER THIS MORNING AFFECTING...FOR THE MOST PART...THE KOFK AND KLNK TERMINALS. OTHERWISE GOOD VFR IS EXPECTED OVER THE NEXT 24 HOURS AT ALL THREE TERMINALS OUTSIDE OF ANY THUNDERSTORM ACTIVITY. THUNDERSTORMS ARE FORECAST TO ROLL THROUGH THE CWA LATER TONIGHT. PRIOR TO THAT...SOME LATE AFTERNOON/EARLY EVENING ISOLATED/SCATTERED COVERAGE OF THUNDERSTORMS IS STILL POSSIBLE. HOWEVER...THE MORE PROBABLE THUNDER OCCURRENCE APPEARS TO BE LATE THIS EVENING AND DURING THE OVERNIGHT. LARGE HAIL...DAMAGING WINDS AND TORRENTIAL RAINFALL ARE ALL POSSIBLE WITH OVERNIGHT CONVECTION. OPTED TO EASE INTO SUB-VFR CONDITIONS IN THE TAFS AND INCLUDE AN MVFR VISBY AND VCTS MENTION STARTING GENERALLY AROUND MIDNIGHT TONIGHT /GIVE OR TAKE AN HOUR/. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && DORN/NIPPER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 437 PM CDT SUN AUG 7 2011 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-081145- 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- 437 PM CDT SUN AUG 7 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 MONDAY THUNDERSTORMS WILL BE POSSIBLE ACROSS THE AREA TONIGHT...MAINLY AFTER SUNSET. SOME STORMS COULD BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS THE MAIN HAZARDS. HEAVY RAIN IS ALSO POSSIBLE. MORE STORMS ARE POSSIBLE LATE MONDAY AFTERNOON WITH LARGE HAIL AND DAMAGING WINDS AGAIN THE PRIMARY HAZARDS. THE STORMS WILL OCCUR AS SEVERAL UPPER LEVEL DISTURBANCES TRACK NORTH OF A FRONTAL BOUNDARY LOCATED ACROSS PARTS OF MISSOURI AND KANSAS. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SUNDAY THUNDERSTORM CHANCES WILL CONTINUE INTO MONDAY EVENING. A FEW STORMS COULD BE SEVERE...WITH LARGE HAIL AND DAMAGING WINDS. THERE IS ALSO A CHANCE OF THUNDERSTORMS FROM TUESDAY AFTERNOON INTO FRIDAY...AS SEVERAL DISTURBANCES MOVE ACROSS THE PLAINS. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER FOR THE NEXT SEVERAL WEEKS. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION MAY BE NEEDED LATER THIS EVENING. FOBERT
The Omaha radar (KOAX), 151 km away, was scanning. The volume nearest the first event began at 03:26 UTC.
1 thunderstorm wind. Local standard time, as filed.
A spotter estimated thunderstorm winds reached around 60 mph.
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, August 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: 322605.