Storm Events Database

Event Details

Event Hail
Magnitude 1.00 in.
State IOWA
County/Area SAC
WFO DMX
Report Source Law Enforcement
NCDC Data Source CSV
Begin Date 2008-05-06 17:45:00.0 CST-6
Begin Location 1N SAC CITY
Begin Lat/Lon 42.44/-95
End Date 2008-05-06 17:45:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 3.00K
Crop Damage 0.00K
Episode Narrative A strong push of warm and unstable air pushed north into Iowa during the day on the 6th. Surface temperatures warmed into the upper 70s to mid 80s across the state, with dew point readings in the 55 to 60 degree range. A cold front moved into the state from the northwest as an upper level short wave lifted northeast across the state during the evening. Most unstable CAPE values were in the 1000-2000 J/kg range by the late afternoon. There was sufficient shear available with the effective shear in the 40 to 50 kt range across the north half of the state. The LCL was quite high, in the 1250 to 1500 meter range. Cape in the -10 to -30 C. layer of the atmosphere had around 200 J/kg of CAPE available. Downdraft CAPE was in the 700 to 900 J/kg range as the soundings indicated an inverted V structure. The freezing level was around 12,000 feet. Thunderstorms fired in a broken line extending from the far northwest corner of Iowa, southwest into Nebraska. The storms became severe quite quickly as they advanced east. Many of the storms produced hail of around one half inch in diameter or so. Several produced hail of three quarters of an inch to one inch in diameter. The hail would have likely been larger if not for the lack of significant CAPE in the -10 to -30 C. layer. As the line evolved, it became solid from north central into west central Iowa. Initially, the northern part of the line took on a bow echo configuration and produced high winds across north central into northeast Iowa. The winds blew over a semi-tractortrailer rig near the 197 mile post on Interstate 35. The bow echo feature continued east into northeast Iowa. As the line moved through Bremer County, high winds blew down road signs and caused damage at the Wal-Mart store there. This feature left an outflow boundary extending east to west across central Iowa. The boundary provided the focal point for additional thunderstorms, which trained across parts of central into northeast Iowa. Farther to the west, many of the storms produced hail and some heavy rainfall. Flooding became a problem with many areas reporting small stream and urban flooding. Flash flooding, as well as areal flooding, became a problem over Wright and Hardin Counties where 3 to 5 inches of rain fell. One of the harder hit areas was in Hardin County at Alden where nearly 5 inches of rain was reported in under three hours. A report of 6.25 inches was received from west of Iowa Falls in Hardin County. This was over a period of six and one half hours. Numerous roads were closed in these two counties with water anywhere from 6 to 24 inches deep running across the roads. In addition, heavy rain fell in the city of Boone in Boone County with water reportedly flowing 6 to 12 inches deep over a number of roads. There were several road closures in the city of Boone.
Event Narrative


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All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 438.00K 0.00K
ESTHERVILLE EMMET CO. IA 05/06/2008 15:47 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
GRUVER EMMET CO. IA 05/06/2008 15:52 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
ARMSTRONG EMMET CO. IA 05/06/2008 15:58 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
RUTHVEN PALO ALTO CO. IA 05/06/2008 16:01 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
LOTTS CREEK KOSSUTH CO. IA 05/06/2008 16:17 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
RAKE WINNEBAGO CO. IA 05/06/2008 17:05 CST-6 Heavy Rain 0 0 0.00K 0.00K
SAC CITY SAC CO. IA 05/06/2008 17:10 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
SAC CITY SAC CO. IA 05/06/2008 17:17 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
SAC CITY SAC CO. IA 05/06/2008 17:19 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
SAC CITY SAC CO. IA 05/06/2008 17:20 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
JOLLEY CALHOUN CO. IA 05/06/2008 17:24 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
SHERWOOD CALHOUN CO. IA 05/06/2008 17:35 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
SAC CITY SAC CO. IA 05/06/2008 17:45 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
(MCW)MASON CITY MUNI CERRO GORDO CO. IA 05/06/2008 17:48 CST-6 Thunderstorm Wind 57 kts. EG 0 0 25.00K 0.00K
(MCW)MASON CITY MUNI CERRO GORDO CO. IA 05/06/2008 17:49 CST-6 Thunderstorm Wind 57 kts. MG 0 0 1.00K 0.00K
SOMERS CALHOUN CO. IA 05/06/2008 17:54 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
LATIMER FRANKLIN CO. IA 05/06/2008 18:17 CST-6 Thunderstorm Wind 53 kts. MG 0 0 1.00K 0.00K
GENEVA FRANKLIN CO. IA 05/06/2008 18:40 CST-6 Thunderstorm Wind 52 kts. EG 0 0 1.00K 0.00K
GENEVA FRANKLIN CO. IA 05/06/2008 18:45 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
IOWA FALLS HARDIN CO. IA 05/06/2008 18:45 CST-6 Heavy Rain 0 0 50.00K 0.00K
JEWELL HAMILTON CO. IA 05/06/2008 18:51 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
BOONE BOONE CO. IA 05/06/2008 19:18 CST-6 Heavy Rain 0 0 50.00K 0.00K
BOONE BOONE CO. IA 05/06/2008 19:29 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
WAVERLY BREMER CO. IA 05/06/2008 19:30 CST-6 Thunderstorm Wind 57 kts. EG 0 0 50.00K 0.00K
AMES STORY CO. IA 05/06/2008 19:42 CST-6 Heavy Rain 0 0 0.00K 0.00K
DEWAR BLACK HAWK CO. IA 05/06/2008 19:53 CST-6 Heavy Rain 0 0 0.00K 0.00K
ONTARIO STORY CO. IA 05/06/2008 20:00 CST-6 Heavy Rain 0 0 10.00K 0.00K
SHELDAHL BOONE CO. IA 05/06/2008 20:14 CST-6 Flash Flood 0 0 25.00K 0.00K
CLARION ARPT WRIGHT CO. IA 05/06/2008 23:30 CST-6 Flash Flood 0 0 25.00K 0.00K
IOWA FALLS MUNI ARPT HARDIN CO. IA 05/06/2008 23:34 CST-6 Flash Flood 0 0 25.00K 0.00K
IOWA FALLS HARDIN CO. IA 05/07/2008 01:30 CST-6 Flood 0 0 75.00K 0.00K
IOWA FALLS HARDIN CO. IA 05/07/2008 05:28 CST-6 Flood 0 0 25.00K 0.00K
IOWA FALLS HARDIN CO. IA 05/07/2008 05:36 CST-6 Flood 0 0 50.00K 0.00K
Totals: 0 0 438.00K 0.00K