Heat index values climbed to around 105 to 108 degrees in the late afternoon of July 26th as temperatures reached the lower 90s and dew point temperatures warmed into the mid 70s to around 80.
Every event with a place to put it; 12 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 OAX wrote it up.
Heat index values climbed to around 105 to 108 degrees in the late afternoon of July 26th as temperatures reached the lower 90s and dew point temperatures warmed into the mid 70s to around 80.
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 Jul 26, 2:19 PM CST, 1 hour 41 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
319 PM CDT TUE JUL 26 2011
.DISCUSSION...TONIGHT THROUGH TUESDAY.
RELATIVELY GOOD AGREEMENT AMONGST THE MODELS THAT ANTICIPATED COOL
FRONT WILL PUSH INTO THE NRN CWA AROUND OR JUST AFTER MIDNIGHT
TONIGHT THEN BECOMES NEARLY STATIONARY WEDNESDAY AFTERNOON. HIGH
DEGREE OF INSTABILITY PROGGED WITH 300MB MU-CAPE IN THE 4000-5000
J/KG RANGE AND PRECIP WATER VALUES PUSHING 2"-2.5" INCHES. DISTINCT
POSSIBILITY FOR SEVERE STORM DEVELOPMENT ALONG THE ADVANCING FRONT.
COMPOSITE PARAMETERS PER THE NAM SHOWING INSTABILITY COMBINED WITH
SHEAR...0-6KM 40-50KT/EFFECTIVE SHEAR 50KT. COUPLE OF NAM PROGS
GIVING CONFLICTING INFORMATION WHETHER CAP WILL BE AN ISSUE. MU-CIN
RELATIVELY HIGH...100-200 J/KG. LID STRENGTH VALUES THOUGH GENERALLY
LESS THAN 2 SUGGEST NIL CAP INFLUENCE. AT ANY RATE...MODELS KEEP
THE SFC BNDRY IN THE VICINITY OF THE CWA THRU AT LEAST FRIDAY...
THUS WILL KEEP POPS IN PLACE.
REMOP GIVING SHOWING RELATIVELY HIGH CONFIDENCE THAT WARM CORE HIGH
PRESSURE DOME WILL BEGIN RETROGRADE NEXT SATURDAY AND FORCE RIDGE
AMPLIFICATION OVER THE GREAT PLAINS. INTERESTING DISCREPANCY THOUGH
BETWEEN GFS AND ECM ON MONDAY AND TUESDAY REGARDING TIMING COLD FRONT
DROPPING INTO THE CNTRL PLAINS. 26/00Z ECM RUN IS MUCH MORE
AGGRESSIVE FORCING THE CAA SWD ASSOCIATED WITH STOUT UPPER TROF
CROSSING SRN CANADA.MEANWHILE 26/06Z GFS KEEPS THE NRN AND CNTRL
PLAINS IN WAA REGIME.
SMALL POPS FRIDAY NIGHT/SATURDAY NIGHT RELATED TO STALLED SFC BNDRY
EXTENDING FROM SFC LOW PRESSURE CENTER IN SRN SASKATCHEWAN THRU THE
CWA INTO NRN MO. BNDRY EVENTUALLY LIFTS NORTHEAST ON SUNDAY. NOTE...
GFS ENSEMBLE IS LENDING SOME SUPPORT THE ECM CAA SOLUTION.
DUE TO HIGH PRESSURE BUILDING IN...WILL OPT FOR DRY FCST SUNDAY
THROUGH TUESDAY. OTHERWISE...SULTRY CONDITIONS PROBABLE SUNDAY AND
MONDAY WITH HEAT INDICES APPROACHING/AROUND 110 DEG.
DEE
&&
.AVIATION...
TAF SITES KOFK/KOMA/KLNK
18Z TAFS
VFR CONDITIONS ARE FORECAST THROUGH THE PERIOD. THUNDERSTORMS MAY
DEVELOP NORTHWEST OF THE FORECAST AREA...AND COULD AFFECT KOFK FROM
27TH/09-13Z...AND KOMA FROM 27TH/12-16Z. DECIDED TO LEAVE
THUNDERSTORMS OUT OF THE KLNK TAF AS THERE WASN/T ENOUGH CONFIDENCE
THAT STORMS WOULD MOVE THAT FAR SOUTH.
DEWALD
&&
.OAX WATCHES/WARNINGS/ADVISORIES...
NE...HEAT ADVISORY UNTIL 7 PM CDT WEDNESDAY FOR NEZ052-053-066>068-
088>093.
IA...HEAT ADVISORY UNTIL 7 PM CDT WEDNESDAY FOR IAZ069-079-080-090-
091.
&&HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 446 PM CDT TUE JUL 26 2011 IAZ043-055-056-NEZ011-012-015>018-030>034-042>045-050-051-065-078- 271200- MONONA-HARRISON-SHELBY-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE- BOONE-MADISON-STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON- BUTLER-SAUNDERS-SEWARD-SALINE- 446 PM CDT TUE JUL 26 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 WEDNESDAY THUNDERSTORMS COULD MOVE INTO NORTHEAST AND POSSIBLY EAST CENTRAL NEBRASKA LATE TONIGHT. THE STORMS WILL DEVELOP NEAR A COLD FRONT OVER THE WESTERN HIGH PLAINS THIS AFTERNOON AND TRACK EAST TONIGHT. THE MAIN SEVERE WEATHER THREATS WOULD BE STRONG WINDS AND VERY HEAVY RAIN...NORTHWEST OF A LINE FROM COLUMBUS TO WAYNE TONIGHT WHERE A SLIGHT RISK OF SEVERE WEATHER WILL EXIST. SOME CHANCE OF THUNDERSTORMS WILL CONTINUE ACROSS THE AREA ON WEDNESDAY AS THE COLD FRONT STALLS ACROSS EASTERN NEBRASKA AND WEST CENTRAL IOWA. SOME STORMS MAY BE SEVERE WEDNESDAY AFTERNOON WITH DAMAGING WINDS THE MAIN HAZARD. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER. .DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY SOME CHANCE OF THUNDERSTORMS WILL PERSIST ACROSS THE AREA WEDNESDAY NIGHT THROUGH THURSDAY NIGHT AS THE COLD FRONT REMAINS STALLED OVER FAR SOUTHEAST NEBRASKA AND SOUTHWEST IOWA. SEVERE STORMS ARE POSSIBLE WEDNESDAY NIGHT AND AGAIN LATE THURSDAY AFTERNOON AND THURSDAY NIGHT. THE COVERAGE AND CONCENTRATION OF THE STRONGEST STORMS COULD BE LIMITED BY RELATIVELY WARM TEMPERATURES ALOFT AND WILL ALSO BE DEPENDENT ON HOW OUTFLOW FROM THE PRIOR DAYS ACTIVITY ALTERS CONVERGENCE ALONG THE COLD FRONT. BOTH OF WHICH WILL BE FURTHER ADDRESSED IN LATER OUTLOOKS. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER FOR THE NEXT SEVERAL WEEKS AT LEAST. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT BUT MAY BE NEEDED LATE WEDNESDAY AFTERNOON AND EVENING. IAZ069-079-080-090-091-NEZ052-053-066>068-088>093-271200- POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-PAGE-DOUGLAS-SARPY- LANCASTER-CASS-OTOE-JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE- RICHARDSON- 446 PM CDT TUE JUL 26 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...EAST CENTRAL NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND WEDNESDAY A HEAT ADVISORY IS IN EFFECT FOR THE AREA THROUGH 7 PM WEDNESDAY. LOW TEMPERATURES TONIGHT WILL ONLY FALL TO AROUND 80 WITH THE HEAT INDEX CLIMBING TO AROUND 105 WEDNESDAY AFTERNOON. THERE WILL BE A CHANCE OF THUNDERSTORMS ON WEDNESDAY AS A COLD FRONT MOVES INTO THE AREA THEN STALLS OR WEAKENS OVER SOUTHEAST NEBRASKA AND SOUTHWEST IOWA. SEVERE STORMS ARE POSSIBLE LATE WEDNESDAY AFTERNOON WITH DAMAGING WINDS THE PRIMARY HAZARD...HEAVY RAIN IS ALSO LIKELY WITH STORMS THAT DO DEVELOP. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER. .DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY SOME CHANCE OF THUNDERSTORMS WILL REMAIN OVER THE AREA WEDNESDAY NIGHT THROUGH THURSDAY NIGHT. SEVERE STORMS ARE POSSIBLE WEDNESDAY NIGHT AND AGAIN LATE THURSDAY AFTERNOON AND THURSDAY NIGHT. THE COVERAGE AND CONCENTRATION OF THE STRONGEST STORMS MAY BE LIMITED BY RELATIVELY WARM TEMPERATURES ALOFT AND WILL ALSO BE DEPENDENT ON HOW OUTFLOW FROM THE PRIOR DAYS ACTIVITY ALTERS CONVERGENCE ALONG THE COLD FRONT. BOTH OF WHICH WILL BE FURTHER ADDRESSED IN LATER OUTLOOKS. HEAT INDEX VALUES WILL AGAIN APPROACH OR EXCEED 105 DEGREES ON THURSDAY AND THE HEAT ADVISORY MAY NEED TO BE EXTENDED. MODERATE TO MAJOR FLOODING WILL CONTINUE ALONG THE MISSOURI RIVER FOR THE NEXT SEVERAL WEEKS AT LEAST. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT BUT MAY BE NEEDED WEDNESDAY AFTERNOON. FOBERT
The national radar mosaic for the moment the first event began.
12 heat. Local standard time, as filed.
Heat index values climbed to 105 to 110 degrees or hotter in the late afternoon of July 26th and during the afternoon of the 27th as temperatures reached the 90s and dew point temperatures warmed into the mid 70s to around 80.
Heat index values climbed to around 105 degrees in the late afternoon of July 26th as temperatures reached the lower 90s and dew point temperatures warmed into the mid to upper 70s.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures reached the 90s and dew point temperatures warmed into the mid 70s to around 80.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures reached the 90s and dew point temperatures warmed into the mid 70s to around 80.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures reached the 90s and dew point temperatures warmed into the mid 70s to around 80.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures reached around 100 degrees along with dew point temperatures around 70.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures reached around 100 with dew point temperatures near 70.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures rose to 95 to 100 with dew point temperatures in the lower 70s.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures rose to 95 to 100 with dew point temperatures in the lower 70s.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures rose to the mid 90s with dew point temperatures in the lower to mid 70s.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures rose to the lower to mid 90s with dew point temperatures in the mid to upper 70s.
Heat index values climbed to 105 to 110 degrees during the afternoon of July 27th|as temperatures rose to the lower to mid 90s with dew point temperatures in the mid to upper 70s.
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, July 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: 316342, 316343, 317782, 317783, 317784, 317785, 317786, 317787, 317788, 317789, 317790, 317791.