Hail, Monona
- When
- September 24, 5:45 PM CST
- Where
- Monona County, 2.17 mi ENE of Castana
- Measured
- 0.75 in hail
- Reported by
- Trained Spotter
- Coordinates
- 42.092, -95.881
Hail up to 3/4 inch was reported along with winds estimated at 60 mph.
Hail and Damaging Winds in Iowa, September 24, 2007
Thunderstorms developed along a slow moving cold front during the late afternoon of September 24th. The storms produced mostly wind damage in western Iowa, although a report of 3/4 inch hail was received near Castana.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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.
What happened
The episode as NWS OAX wrote it up.
Thunderstorms developed along a slow moving cold front during the late afternoon of September 24th. The storms produced mostly wind damage in western Iowa, although a report of 3/4 inch hail was received near Castana.
What forecasters said that day
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 Sep 24, 2:18 PM CST, 3 hours 27 minutes earlier.
Area forecast discussion, Sep 24, 2:18 PM CST, 3 hours 27 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 318 PM CDT MON SEP 24 2007 .DISCUSSION... THE CHANCE FOR PCPN THROUGH TUESDAY...TEMPERATURES THE NEXT SEVERAL DAYS AND THE CHANCE OF PCPN LATE IN THE WEEK ARE THE MAIN FORECAST CONCERNS. WATER VAPOR LOOP EARLY THIS AFTERNOON SHOWED A CLOSED LOW OVER NERN UT AND SWRN WY. A DECENT BAND OF MOISTURE STRETCHED FROM MEXICO ACROSS TX AND UP INTO MN. SO FAR...TSTM COVERAGE HAS BEEN MOSTLY FROM NWRN IA ACROSS MN. ANOTHER BAND OF MOISTURE EXTENDED FROM THE GULF OF MEXICO NORTH ACROSS LA AND UP INTO WI. THE 20Z SURFACE ANALYSIS SHOWED A COLD FRONT FROM NWRN IA INTO NWRN KS. GUSTY WIND AND COOL TEMPERATURES WERE NOTED BEHIND THE FRONT... WITH SOME READINGS ONLY IN THE 40S AND 50S. AHEAD OF THE FRONT... TEMPERATURES WERE IN THE 80S WITH DEWPOINTS IN THE 60S. AS OF 315 PM...COVERAGE OF STORMS SEEMED TO BE ON THE INCREASE... AND CAP WAS ERODING. LEFT HIGH POPS GOING THROUGH TONIGHT OR WENT WITH AREAL COVERAGE WORDING...ESPECIALLY BEFORE 06Z. THINK THAT LOWS SHOULD DROP TO NEAR 50 IN MUCH OF NERN NE...WITH LOWS RANGING TO NEAR 60 FAR SERN CORNER OF NE. THE CHANCE FOR PCPN SHOULD DECREASE TUESDAY MORNING...AND DID NOT MENTION ANY PCPN TUESDAY AFTERNOON. HIGH PRESSURE SHOULD BUILD OVER THE AREA BY LATE TUESDAY. MIXING WONT BE GOOD...AND HIGHS IN THE 60S SEEM APPROPRIATE. A GENERAL TROUGHINESS TO THE 500 MB FLOW IS EXPECTED ACROSS THE NRN AND CNTRL PLAINS INTO THURSDAY...THEN A WEAK RIDGE BUILDS EAST FROM THE ROCKIES. THERE ARE SOME FAIRLY MAJOR MODEL TIMING DIFFERENCES THAT HOPEFULLY WILL WORK THEMSELVES OUT THE NEXT FEW DAYS. 12Z GFS WAS FASTER IN MOVING SURFACE HIGH PRESSURE EAST THURSDAY NIGHT INTO FRIDAY...AND IT STARTED TO DVLP WARM ADVECTION PCPN FRIDAY. DID NOT GO QUITE THAT FAST...BUT WILL MENTION CHANCE OR SLIGHT CHANCE OF TSTMS FROM FRIDAY NIGHT INTO SATURDAY. TROUGH AXIS SHIFTS EAST BY SUNDAY...WITH RIDGING ACROSS THE AREA INTO MONDAY. && .AVIATION... THE FRONT IS MOVING THROUGH KOFK AND WILL PUSH THROUGH KOMA AND KLNK EARLY THIS EVENING. SHOWERS ARE POSSIBLE A KOFK...WITH SHOWERS AND THUNDERSTORMS FOR THE KOMA AND KLNK SITES THRU EARLY EVENING. SW WINDS AT 12 TO 25 KTS AHEAD OF THE FNT WITH NW WINDS AT 10 TO 25 KTS BEHIND THE FNT. VFR CIGS WILL GIVE WAY TO MVFR CIGS MAINLY AFTER 02Z AND CONTINUE TUESDAY MORNING. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && DISCUSSION...MILLER AVIATION...MILLER
Hazardous weather outlook, Sep 24, 4:00 PM CST, 1 hour 45 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 500 PM CDT MON SEP 24 2007 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-251100- 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- 500 PM CDT MON SEP 24 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOST OF EASTERN NEBRASKA AND PARTS OF SOUTHWEST IOWA. .DAY ONE...TONIGHT AND TUESDAY SHOWERS AND THUNDERSTORMS WILL OCCUR ACROSS A LARGE PORTION OF THE AREA THIS EVENING AND TONIGHT. A FEW VERY STRONG TO SEVERE STORMS ARE POSSIBLE...MAINLY BEFORE 10 PM. THE MOST INTENSE STORMS COULD PRODUCE DAMAGING WINDS AND HAIL UP TO ABOUT ONE INCH IN DIAMETER. LOCALLY HEAVY RAIN IS ALSO POSSIBLE. A COLD FRONT IS MOVING THROUGH THE AREA. THE STORMS WILL OCCUR MAINLY ALONG AND IN THE VICINITY OF THE FRONT. .DAYS TWO THROUGH SEVEN...TUESDAY NIGHT THROUGH MONDAY THERE IS A CHANCE OF THUNDERSTORMS IN THE PERIOD FROM FRIDAY NIGHT INTO SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE URGED TO PASS ALONG ANY REPORTS OF HAIL...DAMAGING WINDS OR RAINFALL IN EXCESS OF ONE INCH THROUGH THE EVENING HOURS. SPOTTER ACTIVATION WILL NOT BE NEEDED TUESDAY. MILLER
In the hours before
Local storm report, Sep 24, 5:01 PM CST, 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
601 PM CDT MON SEP 24 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM HAIL 8 NE WEST POINT 41.92N 96.60W
09/24/2007 M1.00 INCH CUMING NE PUBLIC
&&
MILLERLocal storm report, Sep 24, 5:24 PM CST, 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
624 PM CDT MON SEP 24 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0605 PM TSTM WND DMG 8 WSW DECATUR 41.96N 96.39W
09/24/2007 BURT NE PUBLIC
NUMEROUS TREES DOWN AND WINDOWS IN A HOUSE WERE BLOWN IN
AT A LOCATION 6 MILES WEST AND 3 MILES SOUTH OF DECATUR.
WINDS ESTIMATED TO BE OVER 80 MPH.
&&
MILLERThe radar
The Omaha radar (KOAX), 95 km away, was scanning. The volume nearest the first event began at 23:44 UTC.
Event by event
3 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm Wind, Monona
- When
- September 24, 5:45 PM CST
- Where
- Monona County, 2.17 mi NE of Castana
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Trained Spotter
- Coordinates
- 42.102, -95.890
Occurred with 3/4 inch hail.
Thunderstorm Wind, Monona
- When
- September 24, 5:50 PM CST
- Where
- Monona County, 3.77 mi SW of Mapleton
- Measured
- 61 kt (70 mph) estimated gust
- Reported by
- Public
- Coordinates
- 42.132, -95.852
Winds estimated at 70 mph were reported by the public about 4.5 miles southwest of Mapleton.
Thunderstorm Wind, Monona
- When
- September 24, 5:55 PM CST
- Where
- Monona County, 3.3 mi SE of Mapleton
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Public
- Coordinates
- 42.136, -95.754
The public estimated thunderstorm wind gusts at up to 60 mph.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Winds in Nebraska, September 24, 2007
- Damaging Winds in Minnesota, September 24, 2007
- Frost and Freeze in Oregon, September 24, 2007
- Hail and Damaging Winds in Nebraska, September 24, 2007
- Frost and Freeze in California, September 24, 2007
- Hail in Iowa, September 24, 2007
- Damaging Wind in Minnesota, September 24, 2007
- Damaging Wind in Minnesota, September 24, 2007
- Damaging Wind in Texas, September 24, 2007
More
Every storm in Iowa in 2007Every state in 2007This day in weather historyWarnings in Iowa, September 2007
Sources
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: 51426, 51429, 51427, 51428.