Hail, Cass
- When
- May 23, 2:28 PM CST
- Where
- Cass County, 2.08 mi N of Fletcher Chapel
- Measured
- 1.25 in hail
- Property damage
- $10,000
- Crop damage
- $5,000
- Reported by
- Trained Spotter
- Coordinates
- 41.330, -95.000
Hail and Damaging Winds in Iowa, May 23, 2007
A strong southerly flow of very moist air pushed into Iowa. Dew point temperatures rose to the mid 60s to near 70 by late afternoon.
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
- 1
- Property damage
- $156,000
- Crop damage
- $40,000
- Events
- 16
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 DMX wrote it up.
A strong southerly flow of very moist air pushed into Iowa. Dew point temperatures rose to the mid 60s to near 70 by late afternoon. The airmass became relatively unstable, however the dynamics were somewhat limited. The effective shear was in the 25 to 35 kt range. The freezing level was between 12,000 and 13,000 feet, however the sounding was quite saturated which limited the hail somewhat. The CAPE in the -10 to -30 C. layer was in the 200 to 300 J/kg range with the most unstable CAPE in the 1000 to 2000 J/lg range. Lifted indices were in the -2 to -4 C. range. A slow moving cold front entered western Iowa from the west during the late afternoon. Thunderstorms formed along the front and lifted northeast. Many of the storms produced large amounts of pea size hail, however very few produced any significant size hail. Most of the hail was in the three quarter to one inch diameter range. A bow echo segment formed along the east edge of the system and produced scattered reports of high winds. A semi-tractortrailer was blown off the highway along Interstate 80 at the Stuart exit. The truck overturned, blocking the highway and injuring the driver. He was flown to hospital in Des Moines. High winds snapped power poles southwest of Britt. A severe thunderstorm in the Lake Mills area produced what appears to be a downburst wind gust that took the roof off of a grain bin and blew down 6 power poles. A short time later, the same segment produced 61 MPH winds at the Waterloo Airport.
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 Des Moines, IA wrote its last area forecast discussion before the first event at May 23, 2:40 AM CST, 11 hours 48 minutes earlier.
Area forecast discussion, May 23, 2:40 AM CST, 11 hours 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 340 AM CDT WED MAY 23 2007 .DISCUSSION... MAIN FOCUS WILL BE EVENT OVER THE NEXT 24 TO 48 HOURS AS FRONT FINALLY MOVES EAST. IN LONGER TERM IS SECOND SYSTEM AND AFFECT ON THE AREA. TODAY MAIN S/W REMAINS WEST HOWEVER MINOR WAVES ROTATE THAT SHOULD AID IN DEVELOPING STORMS THIS AFTERNOON. DYNAMICS NOT THAT IMPRESSIVE TODAY BEST LIFT AND FORCING OVER NWRN IOWA OUT OF CWA. HOWEVER SLIGHT RISK SMALL PORTION OF WEST PORTION OF CWA IF HEATING CAN DESTABILIZE AIRMASS. LOOK AT SOUNDINGS SLIGHT INVERSION TO OVERCOME AND CAPE LOW AND FLOW UNIDIRECTIONAL SO COULD EXPECT AN ISOLATED HAILER OR DAMAGING WIND. LATER THIS AFTERNOON AS FRONT BEGINS MOVE EAST DECENT LIFT AND THETA ADVECTION WITH PWS STEADILY INCREASING BEST SHOT FOR HEAVY RAINS INTO THURSDAY MORNING AS DEVELOPMENT WILL SLIDE ALONG THE BOUNDARY AND TRAINING WILL LIKELY BRING 2 INCHES OF RAIN TO SOME LOCATIONS IN WESTERN PORTION OF CWA. EVEN THOUGH THIS RUN SLOWS FRONTAL MOVEMENT HAVE HELD LINE ON TIMING WITH POPS DECREASING FOR THE AFTERNOON ON THURSDAY AS BEST DYNAMICAL FIELDS WELL EAST OF THE CWA. ON FRIDAY DURING DAY LITTLE SUPPORT FOR ANY DEVELOPMENT BEFORE NEXT SYSTEM ARRIVES AS BOUNDARY NORTH OF STATE. LATEST MODEL RUN DOES NOT BRING ANY DYNAMICAL FIELDS INTO THE STATE BEFORE 06Z/26TH SO HAVE LOWERED OR REMOVED POPS FOR FRIDAY EVENING AND THEN SLOWLY RAISED POPS AFTER 06Z. ON SATURDAY MORNING BOUNDARY BACK INTO THE STATE AND GOOD FOCUS FOR DEVELOPMENT AND ONGOING RAIN INTO THE EVENING. NAM TEMPERATURES FOLLOWED FOR THE MOST PART THOUGH SOME ADJUSTING FOR RAIN CLOUD COVER AND FRONTAL MOVEMENT. && .AVIATION/SHORT TERM... COLD FRONT FM THE ERN DAKOTAS THROUGH CEN KS WILL MOVE SLOWLY E TDY. SHOWERS AND THUNDERSTORMS ONGOING OVER WRN IA SHOULD DIMINISH THROUGH THE MORNING. EXPECT ANOTHER ROUND THIS AFTN AS A DISTURBANCE MOVES UP THE BOUNDARY DURING PEAK HEATING REFIRING STORMS. MEAN FLOW PUTS THAT EAST DURING THE 18Z-00Z PERIOD. FRONTAL PASSAGE THROUGH CENTRAL IA IS NOT EXPECTED UNTIL THURSDAY. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && .AVIATION/SHORT TERM...BOKSA .LONG TERM...FORSTER/101/22
Hazardous weather outlook, May 23, 7:10 AM CST, 7 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE DES MOINES IA 810 AM CDT WED MAY 23 2007 IAZ004-005-015-023-024-033>035-044>046-057-058-070-071-081-092- 241100- EMMET-KOSSUTH-PALO ALTO-POCAHONTAS-HUMBOLDT-SAC-CALHOUN-WEBSTER- CRAWFORD-CARROLL-GREENE-AUDUBON-GUTHRIE-CASS-ADAIR-ADAMS-TAYLOR- 810 AM CDT WED MAY 23 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY...BUT WILL BECOME MORE NUMEROUS BY LATE AFTERNOON. A FEW STORMS MAY BECOME SEVERE WITH THE STORMS PRODUCING LARGE HAIL AND DAMAGING WINDS. THERE IS THE LIKELIHOOD THAT THE STORMS WILL PRODUCE HEAVY RAINS OF 1 TO 2 INCHES AND ISOLATED HIGHER AMOUNTS TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS WILL LINGER INTO THURSDAY MORNING. SOME OF THESE STORMS COULD PRODUCE LARGE HAIL AND DAMAGING WINDS. THERE IS ANOTHER CHANCE FOR THUNDERSTORMS FRIDAY NIGHT...SATURDAY AND SATURDAY NIGHT. HOWEVER AT THIS TIME THE SPECIFIC SEVERE THREAT CAN NOT BE DETERMINED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY LATE THIS AFTERNOON AND TONIGHT AND POSSIBLY ON THURSDAY MORNING. ANY REPORTS OF HEAVY RAINFALL WOULD BE HELPFUL. IAZ006-007-016-017-025-026-036-037-047-048-059-060-072-073-082- 083-093-094-241100- WINNEBAGO-WORTH-HANCOCK-CERRO GORDO-WRIGHT-FRANKLIN-HAMILTON- HARDIN-BOONE-STORY-DALLAS-POLK-MADISON-WARREN-UNION-CLARKE- RINGGOLD-DECATUR- 810 AM CDT WED MAY 23 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY...BUT WILL BECOME MORE NUMEROUS BY LATE AFTERNOON. ISOLATED STORMS MAY BECOME SEVERE WITH THE STORMS PRODUCING LARGE HAIL AND DAMAGING WINDS. THERE IS THE LIKELIHOOD THAT THE STORMS WILL PRODUCE HEAVY RAINS OF 1 TO 2 INCHES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS WILL LINGER INTO THURSDAY MORNING. SOME OF THESE STORMS COULD PRODUCE LARGE HAIL AND DAMAGING WINDS. THERE IS ANOTHER CHANCE FOR THUNDERSTORMS FRIDAY NIGHT...SATURDAY AND SATURDAY NIGHT. HOWEVER AT THIS TIME THE SPECIFIC SEVERE THREAT CAN NOT BE DETERMINED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY TONIGHT AND POSSIBLY ON THURSDAY MORNING. ANY REPORTS OF HEAVY RAINFALL WOULD BE HELPFUL. IAZ027-028-038-039-049-050-061-062-074-075-084>086-095>097-241100- BUTLER-BREMER-GRUNDY-BLACK HAWK-MARSHALL-TAMA-JASPER-POWESHIEK- MARION-MAHASKA-LUCAS-MONROE-WAPELLO-WAYNE-APPANOOSE-DAVIS- 810 AM CDT WED MAY 23 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TODAY...BUT WILL BECOME MORE NUMEROUS BY LATE AFTERNOON. ISOLATED STORMS MAY BECOME SEVERE WITH THE STORMS PRODUCING LARGE HAIL AND DAMAGING WINDS. THERE IS THE LIKELIHOOD THAT THE STORMS WILL PRODUCE HEAVY RAINS OF AROUND AN INCH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORMS WILL LINGER INTO THURSDAY MORNING. SOME OF THESE STORMS COULD PRODUCE LARGE HAIL AND DAMAGING WINDS. THERE IS ANOTHER CHANCE FOR THUNDERSTORMS FRIDAY NIGHT...SATURDAY AND SATURDAY NIGHT. HOWEVER AT THIS TIME THE SPECIFIC SEVERE THREAT CAN NOT BE DETERMINED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY TONIGHT AND POSSIBLY ON THURSDAY MORNING. ANY REPORTS OF HEAVY RAINFALL WOULD BE HELPFUL. MOYER/FORSTER
In the hours before
Local storm report, May 23, 9:14 AM CST, 5 hours 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1014 AM CDT WED MAY 23 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1005 AM HAIL NEWTON 41.70N 93.05W
05/23/2007 E1.00 INCH JASPER IA BROADCAST MEDIA
FROM KCCI TV
&&
JJOHNSONLocal storm report, May 23, 9:14 AM CST, 5 hours 14 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
1014 AM CDT WED MAY 23 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1002 AM HAIL NEWTON 41.70N 93.05W
05/23/2007 E1.00 INCH JASPER IA BROADCAST MEDIA
FROM KCCI TV
&&
JJOHNSONThe radar
The Omaha radar (KOAX), 114 km away, was scanning. The volume nearest the first event began at 20:29 UTC.
Event by event
8 hail, 8 thunderstorm wind. Local standard time, as filed.
Hail, Carroll
- When
- May 23, 3:25 PM CST
- Where
- Carroll County, 0.69 mi S of Glidden
- Measured
- 1 in hail
- Property damage
- $5,000
- Crop damage
- $5,000
- Reported by
- Law Enforcement
- Coordinates
- 42.060, -94.730
Hail, Adair
- When
- May 23, 3:38 PM CST
- Where
- Adair County, 4.32 mi NW of Rosserdale
- Measured
- 1 in hail
- Property damage
- $2,000
- Crop damage
- $5,000
- Reported by
- Trained Spotter
- Coordinates
- 41.450, -94.470
Hail, Adair
- When
- May 23, 3:54 PM CST
- Where
- Adair County, 7.58 mi NNE of Howe
- Measured
- 1 in hail
- Property damage
- $5,000
- Crop damage
- $5,000
- Reported by
- Trained Spotter
- Coordinates
- 41.500, -94.320
Hail, Adair
- When
- May 23, 3:58 PM CST
- Where
- Adair County, 4.18 mi N of Howe
- Measured
- 1 in hail
- Property damage
- $2,000
- Crop damage
- $5,000
- Reported by
- Emergency Manager
- Coordinates
- 41.460, -94.370
Hail, Hancock
- When
- May 23, 4:07 PM CST
- Where
- Hancock County, 1.52 mi E of Duncan
- Measured
- 0.75 in hail
- Crop damage
- $5,000
- Reported by
- Emergency Manager
- Coordinates
- 43.100, -93.700
Thunderstorm Wind, Hancock
- When
- May 23, 4:10 PM CST
- Where
- Hancock County, 2.9 mi NE of Stilson
- Measured
- 61 kt (70 mph) estimated gust
- Property damage
- $10,000
- Reported by
- Emergency Manager
- Coordinates
- 43.060, -93.860
Thunderstorm Wind, Dallas
- When
- May 23, 4:15 PM CST
- Where
- Dallas County, 0.86 mi SE of Dawson
- Measured
- 57 kt (66 mph) estimated gust
- Injuries
- 1 direct, 0 indirect
- Property damage
- $25,000
- Reported by
- Emergency Manager
- Coordinates
- 41.841, -94.218
Thunderstorm Wind, Hancock
- When
- May 23, 4:15 PM CST to 4:30 PM CST
- Where
- Hancock County, Garner
- Measured
- 70 kt (81 mph) estimated gust
- Property damage
- $10,000
- Reported by
- Trained Spotter
- Coordinates
- 43.100, -93.620
Hail, Dallas
- When
- May 23, 4:19 PM CST
- Where
- Dallas County, 1.03 mi W of Kennedy
- Measured
- 0.88 in hail
- Property damage
- $2,000
- Crop damage
- $5,000
- Reported by
- Trained Spotter
- Coordinates
- 41.620, -94.140
Thunderstorm Wind, Hancock
- When
- May 23, 4:25 PM CST
- Where
- Hancock County, 1.01 mi E of Garner
- Measured
- 57 kt (66 mph) estimated gust
- Property damage
- $5,000
- Reported by
- Emergency Manager
- Coordinates
- 43.100, -93.600
Hail, Dallas
- When
- May 23, 4:54 PM CST
- Where
- Dallas County, 0.86 mi SW of Adel
- Measured
- 1 in hail
- Property damage
- $5,000
- Crop damage
- $5,000
- Reported by
- Emergency Manager
- Coordinates
- 41.610, -94.030
Thunderstorm Wind, Winnebago
- When
- May 23, 5:30 PM CST
- Where
- Winnebago County, 2 mi S of Lake Mills
- Measured
- 70 kt (81 mph) estimated gust
- Property damage
- $50,000
- Reported by
- Newspaper
- Coordinates
- 43.391, -93.530
Thunderstorm Wind, Franklin
- When
- May 23, 5:55 PM CST
- Where
- Franklin County, Hampton
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $10,000
- Reported by
- Newspaper
- Coordinates
- 42.750, -93.200
Thunderstorm Wind, Butler
- When
- May 23, 6:15 PM CST
- Where
- Butler County, Parkersburg
- Measured
- 57 kt (66 mph) estimated gust
- Property damage
- $10,000
- Reported by
- Trained Spotter
- Coordinates
- 42.570, -92.780
Thunderstorm Wind, Black Hawk
- When
- May 23, 6:54 PM CST
- Where
- Black Hawk County, (Alo)waterloo Muni A
- Measured
- 53 kt (61 mph) measured gust
- Property damage
- $5,000
- Reported by
- ASOS
- Coordinates
- 42.550, -92.400
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
- Tornadoes and Flash Flooding in Texas, May 23 to 31, 2007
- Flash Flooding and Flooding in Kansas, May 23 to 28, 2007
- Flash Flooding and Flooding in Kansas, May 23 to 28, 2007
- Tornadoes and Flash Flood in Kansas, May 23 to 24, 2007
- Flash Flood and Damaging Wind in Kansas, May 23 to 24, 2007
- Hail and Lightning Strikes in Kansas, May 23 to 24, 2007
- Tornado and Hail in Minnesota, May 23, 2007
- Hail and Damaging Wind in Louisiana, May 23, 2007
- Lightning Strike in Oklahoma, May 23, 2007
- Hail and Damaging Winds in Oklahoma, May 23 to 24, 2007
- Hail and Damaging Winds in Texas, May 23, 2007
- Hail in Oklahoma, May 23, 2007
More
Every storm in Iowa in 2007Every state in 2007This day in weather historyWarnings in Iowa, May 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: 22921, 22922, 22924, 22925, 22926, 22927, 22930, 22931, 23090, 22928, 22932, 22929, 26494, 26495, 22933, 22934.