A stationary front extended across extreme southeast Nebraska and southwest Iowa during the afternoon of August 7th. Conditions along and south of the boundary were very unstable with temperatures well into the 90s and dew point temperatures in the mid and upper 70s.
Every event with a place to put it. 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.
A stationary front extended across extreme southeast Nebraska and southwest Iowa during the afternoon of August 7th. Conditions along and south of the boundary were very unstable with temperatures well into the 90s and dew point temperatures in the mid and upper 70s. Scattered thunderstorms...a few severe with heavy rain...developed along and north of the boundary.
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, 2:52 PM CST, 6 hours 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 352 PM CDT TUE AUG 7 2007 .DISCUSSION... THE EARLY PARTS OF THE FORECAST ARE DEPENDENT ON MESOSCALE DETAILS OF FRONTAL AND OUTFLOW BOUNDARIES...AND POSITIONS OF WEAK SHORT WAVES RIDING ACROSS OUR AREA AT THE EDGE OF THE UPPER RIDGE. THIS IS NOT A HIGH CONFIDENCE SITUATION. IT APPEARS THAT SCT TSTMS WILL CONTINUE THIS EVE AND EARLY TONIGHT MAINLY TO THE SOUTH OF WEAKENING MCV TRACKING OUT OF NORTHEAST NEB. AGREE WITH SPC THAT FRONTAL BOUNDARY JUST S OF FNB HAS POTENTIAL TO ERUPT INTO SVR MULTICELLS...BUT HAS NOT SHOWN MUCH INDICATION OF SERIOUSLY BREAKING CAP TO THIS POINT. LATE TONIGHT EXPECT THE AREA TO COME UNDER THE INFLUENCE OF NEXT SHORT WAVE CURRENTLY MOVING NORTHEAST FROM NM INTO CO. AREA WILL REMAIN IN SUBTROP MOIST AXIS NORTH OF THE FRONTAL BOUNDARY THROUGH TOMORROW...BUT IT APPEARS THAT DIURNAL TIMING OF THE NEXT WAVE WILL NOT ESPECIALLY FAVOR HEAVY RAIN. LLJ MAY HELP CONVECTION AS IT ENTERS AREA LATE TNGT...BUT UNCERTAIN THAT IT WILL BE AS STRONG AS DEPICTED BY NAM...WHICH HAS BEEN HAVING TROUBLE PLACING SYSTEMS. DECIDED NOT TO ISSUE FLASH FLOOD WATCH AS ONLY A FEW COUNTIES HAVE RECENTLY RECEIVED ENOUGH RAIN TO BE VERY SUSCEPTABLE. INSTEAD...THINK BEST CHC PRECIP WILL BE DURING THE DAY WED...KEEPING CLOUDS OVER MOST OF THE AREA AND TEMPS DOWN FOR ONE MORE DAY. ACTIVITY COULD LAST INTO WED NIGHT...ESPCEIALLY IF ANOTHER WAVE MATERIALIZES IN SW FLOW ALOFT. AFTER THAT...RIDGE WILL BE BUILDING ALOFT AND WARMER MID LEVEL TEMPS WILL MAKE IT DIFFICULT FOR ORGANIZED PRECIP TO DEVELOP. AREA WILL STILL BE IN WEAK OUTFLOW FROM SFC HIGH TO OUR NORTHEAST ON THU. HOWEVER...EXPECT CAPPING AND LOTS OF SUN TO ALLOW TEMPS TO REBOUND INTO THE 90S...ALONG WITH UNCOMFORTABLY HIGH SFC DEWPOINTS DUE TO EVAPORATION INTO SHALLOW INVERSION. FROM THURSDAY ONWARD EXPECT THAT THE MAIN WEATHER STORY WILL BE THE HEAT. AREA WILL BE UNDER HOT RIDGE ALOFT AT LEAST INTO EARLY NEXT WEEK. AGREE WITH HPC IN KEEPING FRONTAL BOUNDARY NORTH OF THE AREA THRU TUESDAY WITH LITTLE CHC OF RAIN EXCEPT PERHAPS IN THE FAR N. WHILE SOME EROSION OF THE UPPER RIDGE IS POSSIBLE BY TUE...ENSEMBLES SUGGEST THAT THE BALANCE OF PROBABILITY IS FOR HIGHS WELL INTO THE 90S AND DEW POINTS HIGH ENOUGH THAT A HEAT ADVSRY MAY BE NEEDED. MENTION OF HEAT WAS ADDED TO THE HAZARDS OUTLOOK. && .AVIATION... CONVECTION EXPECTED TO CONTINUE ACROSS KOFK/KOMA/KLNK TAF SITES THRU 18Z TAF PD. SEVERAL SFC BOUNDARIES TO FOCUS ACTIVITY ON SO TOUGH TO PIN DOWN EXACT DEVELOPMENT. HAVE INCLUDED TEMP GROUPS TO COVER HEAVIER TSTMS. OTHERWISE...CEILINGS WL BE MVFR WITH IFR CONDITIONS DURING TSTMS. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && POLLACK/GRIFFIS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 430 PM CDT TUE AUG 7 2007 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-081000- ANTELOPE-BOONE-BURT-BUTLER-CASS-CEDAR-COLFAX-CUMING-DODGE-DOUGLAS- FREMONT IA-GAGE-HARRISON IA-JEFFERSON-JOHNSON-KNOX-LANCASTER-MADISON- MILLS IA-MONONA IA-MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-PAWNEE-PIERCE- PLATTE-POTTAWATTAMIE IA-RICHARDSON-SALINE-SARPY-SAUNDERS-SEWARD- SHELBY IA-STANTON-THURSTON-WASHINGTON-WAYNE- 430 PM CDT TUE AUG 7 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA. .DAY ONE...TONIGHT AND WEDNESDAY THERE WILL BE A CHANCE OF THUNDERSTORMS AGAIN TONIGHT...MAINLY FROM SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA...SOUTH OF A LINE FROM HARLAN IOWA TO OMAHA TO DAVID CITY. A FEW STORMS MAY BE SEVERE THIS EVENING WITH DAMAGING WINDS AND LARGE HAIL THE PRIMARY HAZARDS. IN ADDITION...HEAVY RAIN IS ALSO LIKELY WITH THE STORMS WHICH MAY PRODUCE LOCALIZED FLOODING. THE CHANCE OF THUNDERSTORMS WILL CONTINUE ACROSS THE AREA ON WEDNESDAY WITH DAMAGING WINDS AGAIN THE PRIMARY HAZARD. .DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY HOT AND HUMID WEATHER WILL PREDOMINATE BEGINNING THURSDAY AS THE REGION STARTS INTO A PROLONGED SUMMER HEAT WAVE. AFTERNOON HEAT INDICES MAY EXCEED 105. THE CHANCE OF THUNDERSTORMS WILL CONTINUE INTO WEDNESDAY NIGHT AS THE FRONT REMAINS IN THE AREA. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. FOBERT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
443 PM CDT TUE AUG 07 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 PM HAIL 9 S JOHNSON 40.28N 96.00W
08/07/2007 E1.00 INCH NEMAHA NE PUBLIC
&&
DEWALDPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
655 PM CDT TUE AUG 07 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM HAIL 4 NW BARADA 40.26N 95.63W
08/07/2007 E0.75 INCH RICHARDSON NE PUBLIC
A SMALL AMOUNT OF HAIL UP TO 3/4 INCH IN DIAMETER
OCCURRED ALONG THE RICHARDSON AND NEMAHA COUNTY LINE
NORTHWEST OF BARADA.
&&
MILLERPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
926 PM CDT TUE AUG 07 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1045 AM TSTM WND GST ST. EDWARD 41.57N 97.86W
08/06/2007 E70.00 MPH BOONE NE TRAINED SPOTTER
1100 AM TSTM WND GST MONROE 41.47N 97.60W
08/06/2007 E60.00 MPH PLATTE NE TRAINED SPOTTER
1150 AM TSTM WND DMG GLENWOOD 41.05N 95.74W
08/06/2007 MILLS IA LAW ENFORCEMENT
A FEW TREES DOWN AND NUMEROUS LARGE LIMBS FROM AROUND THE
CENTER OF TOWN TO EAST SIDE OF TOWN AND SOME WINDOWS
BLOWN OUT OF BUILDINGS.
1200 PM TSTM WND DMG 1 NW COLON 41.31N 96.62W
08/06/2007 SAUNDERS NE PUBLIC
TREE LIMBS DOWN. WINDS ESTIMATED AT 60 MPH.
1230 PM HEAVY RAIN 2 E PRAGUE 41.31N 96.77W
08/06/2007 M1.40 INCH SAUNDERS NE PUBLIC
RAINFALL OF 1.40 IN ABOUT 15 MINUTES FROM STORMS AS THEY
MOVED THROUGH.
0125 PM HEAVY RAIN ELKHORN 41.28N 96.24W
08/06/2007 M1.42 INCH DOUGLAS NE NWS EMPLOYEE
RAINFALL OF 1.42 INCHES FROM STORMS.
0355 PM HEAVY RAIN DAVID CITY 41.25N 97.13W
08/06/2007 M1.69 INCH BUTLER NE CO-OP OBSERVER
RAINFALL FROM STORMS LATE THIS MORNING AND EARLY THIS
AFTERNOON ON THE SOUTH END OF DAVID CITY WAS 1.69 INCHES.
UNOFFICIAL AMOUNTS ON THE NORTH SIDE OF TOWN WERE AS HIGH
AS 2.40 INCHES.
0650 PM TSTM WND GST 4 N CRESCENT 41.42N 95.86W
08/06/2007 E60.00 MPH POTTAWATTAMIE IA PUBLIC
0719 PM TSTM WND GST 4 S NEOLA 41.39N 95.62W
08/06/2007 E60.00 MPH POTTAWATTAMIE IA PUBLIC
0915 PM HAIL 4 E KENNARD 41.47N 96.13W
08/06/2007 E0.75 INCH WASHINGTON NE PUBLIC
0430 PM HAIL 9 S JOHNSON 40.28N 96.00W
08/07/2007 E1.00 INCH NEMAHA NE PUBLIC
0530 PM HAIL 4 NW BARADA 40.26N 95.63W
08/07/2007 E0.75 INCH RICHARDSON NE PUBLIC
A SMALL AMOUNT OF HAIL UP TO 3/4 INCH IN DIAMETER
OCCURRED ALONG THE RICHARDSON AND NEMAHA COUNTY LINE
NORTHWEST OF BARADA.
&&
MILLERThe Omaha radar (KOAX), 130 km away, was scanning. The volume nearest the first event began at 03:16 UTC.
1 thunderstorm wind, 1 heavy rain. Local standard time, as filed.
Thunderstorm winds estimated at 60 mph downed power lines and tree limbs in Clarinda. Several Lightning strikes to transformers and the downed power lines caused a little over 2000 residents to lose power in town for several hours.
Rainfall of 2.54 inches in around 1 hour produced some street flooding in Clarinda.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2007Every state in 2007This day in weather historyWarnings in Iowa, August 2007
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: 43671, 39784.