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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 65 kts. |
| State | IOWA |
| County/Area | GRUNDY |
| WFO | DMX |
| Begin Date | 06/06/2008 00:30:00 CST-6 |
| Begin Range | 1 |
| Begin Azimuth | S |
| Begin Location | DIKE |
| Begin Lat/Lon | 42.46/-92.63 |
| End Date | 06/06/2008 00:30:00 CST-6 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 100.00K |
| Crop Damage | 0.00K |
| Episode Narrative | A very dynamic weather situation unfolded during the 5th into the 6th. Although the atmosphere was summer like in the lower elevations, the upper levels were more typical of April. A strong upper level low pressure area lifted northeast out of the southern Rockies with a negatively tilted trough of low pressure lifting northeast across the central U.S. An intense low pressure area developed over northern Kansas and lifted north into southeast North Dakota by the morning of the 6th, with a central Pressure of 984 mb. During the day on the 5th, the atmosphere was capped with the freezing level rising to 15,600 feet by the evening hours over central Iowa. A warm front lifted north across Iowa, with temperatures warming into the mid 80s to the south of the front with dewpoint readings in the low 70s. It became quite unstable by evening with MUCAPE between 2500 and 3000 J/kg and lifted indices in the -5 to -9 C. range. Considerable shear was available with the effective shear between 40 and 65 kts by evening. Downdraft CAPE was between 800 and 1400 J/kg across the CWA, with 400 to 500 J/kg of CAPE available in the -10 to -30 C. layer of the atmosphere. The airmass became very moist by evening with 1.6 to 1.9 inches of precipitable water available by evening. The LCL fall to between 750 and 1250 meters. Thunderstorms erupted to the southwest of Iowa in central Kansas, along the dry line there. The storms raced northeast into Iowa by sunset. In spite of the dynamics that were in place, the amount of severe weather was relatively limited. Hail was limited by the high freezing level and lack of supercellular development. Several of the storms produced small hail and a few produced high winds. There were several reports of brief tornado touchdowns, but little in the way of damage was reported for the most part. The first tornado touched down in Cass County and was only on the ground briefly. Another tornado touched down in Union County. The tornado took the roof off of an outbuilding and knocked down some power lines. The strongest tornado was on the ground for over 18 miles in Warren and Marion Counties. The tornado track was over open country for the most part and damaged outbuildings and one house. Three other tornadoes touched down in Jasper County, causing some moderate damage. The most significant feature with this event was the flash flooding. Soil conditions across the state were very saturated. Any significant rainfall resulted in flash flooding. A narrow band of heavier rainfall stretched from south central into central Iowa. Flash flooding occurred in the Des Moines metro area as the airport recorded 4.15 inches of rainfall for the day, with about 3 inches falling in two hours. Reports of severe street flooding were received with numerous reports of manhole covers being blown off. During the event, high winds occurred over the far northwest part of the CWA as the surface low intensified rapidly and the gradient tightened. A window was blown out in Pocahontas County, with tree and power line damage done in Emmet County. A barn was also damaged near Gruver in Emmet County by the high wind. |
| Event Narrative | Damage was done to a mobile home park. A shed was destroyed. Mobile home was moved off its foundation with siding blown off homes. |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 2 | 1.173M | 37.00K | |||||||
| CUMBERLAND | CASS CO. | IA | 06/05/2008 | 19:12 | CST-6 | Tornado | EF0 | 0 | 0 | 0.00K | 0.00K |
| SUMMERSET | WARREN CO. | IA | 06/05/2008 | 19:23 | CST-6 | Flood | 0 | 0 | 25.00K | 5.00K | |
| ANITA MUNI ARPT | CASS CO. | IA | 06/05/2008 | 19:23 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 1.00K | 0.00K |
| POCAHONTAS (ZONE) | POCAHONTAS (ZONE) | IA | 06/05/2008 | 19:58 | CST-6 | High Wind | 57 kts. EG | 0 | 0 | 3.00K | 0.00K |
| POCAHONTAS (ZONE) | POCAHONTAS (ZONE) | IA | 06/05/2008 | 19:58 | CST-6 | High Wind | 61 kts. EG | 0 | 0 | 5.00K | 0.00K |
| CRESTON | UNION CO. | IA | 06/05/2008 | 20:24 | CST-6 | Tornado | EF1 | 0 | 0 | 25.00K | 2.00K |
| EMMET (ZONE) | EMMET (ZONE) | IA | 06/05/2008 | 21:07 | CST-6 | High Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| LORIMOR | UNION CO. | IA | 06/05/2008 | 21:10 | CST-6 | Hail | 0.88 in. | 0 | 0 | 1.00K | 5.00K |
| WINDSOR HGTS | POLK CO. | IA | 06/05/2008 | 21:25 | CST-6 | Funnel Cloud | 0 | 0 | 0.00K | 0.00K | |
| SLATER | STORY CO. | IA | 06/05/2008 | 21:34 | CST-6 | Hail | 0.88 in. | 0 | 0 | 1.00K | 5.00K |
| AMES | STORY CO. | IA | 06/05/2008 | 21:49 | CST-6 | Hail | 0.88 in. | 0 | 0 | 2.00K | 5.00K |
| DES MOINES | POLK CO. | IA | 06/05/2008 | 21:55 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| EAST PERU | MADISON CO. | IA | 06/05/2008 | 21:56 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| CUMMING | WARREN CO. | IA | 06/05/2008 | 22:16 | CST-6 | Flash Flood | 0 | 0 | 10.00K | 0.00K | |
| SUMMERSET | WARREN CO. | IA | 06/05/2008 | 22:22 | CST-6 | Flash Flood | 0 | 0 | 10.00K | 0.00K | |
| DECATUR CITY | DECATUR CO. | IA | 06/05/2008 | 22:30 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 0.00K |
| VAN WERT | DECATUR CO. | IA | 06/05/2008 | 22:40 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 5.00K | 0.00K |
| PROLE | WARREN CO. | IA | 06/05/2008 | 22:45 | CST-6 | Flood | 0 | 0 | 25.00K | 0.00K | |
| NORWALK | WARREN CO. | IA | 06/05/2008 | 22:45 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| (DSM)DES MOINES INTL | POLK CO. | IA | 06/05/2008 | 22:45 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 0.00K | |
| VAN WERT | DECATUR CO. | IA | 06/05/2008 | 22:45 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 5.00K | 0.00K |
| (DSM)DES MOINES INTL | POLK CO. | IA | 06/05/2008 | 22:45 | CST-6 | Flash Flood | 0 | 0 | 2.00K | 0.00K | |
| LESLIE | CLARKE CO. | IA | 06/05/2008 | 22:49 | CST-6 | Tornado | EF1 | 0 | 0 | 0.00K | 0.00K |
| LESLIE | CLARKE CO. | IA | 06/05/2008 | 22:49 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 35.00K | 0.00K |
| LEON | DECATUR CO. | IA | 06/05/2008 | 22:50 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 5.00K | 0.00K |
| GUSS | TAYLOR CO. | IA | 06/05/2008 | 22:50 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| GUSS | TAYLOR CO. | IA | 06/05/2008 | 22:50 | CST-6 | Flash Flood | 0 | 0 | 10.00K | 0.00K | |
| OSCEOLA MUNI ARPT | CLARKE CO. | IA | 06/05/2008 | 22:54 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 5.00K | 0.00K |
| LEON | DECATUR CO. | IA | 06/05/2008 | 23:00 | CST-6 | Flash Flood | 0 | 0 | 10.00K | 0.00K | |
| LIBERTY CENTER | WARREN CO. | IA | 06/05/2008 | 23:10 | CST-6 | Tornado | EF1 | 0 | 0 | 150.00K | 10.00K |
| LIBERTY CENTER | WARREN CO. | IA | 06/05/2008 | 23:13 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| SANDYVILLE | WARREN CO. | IA | 06/05/2008 | 23:20 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 25.00K | 0.00K |
| SWAN | MARION CO. | IA | 06/05/2008 | 23:25 | CST-6 | Tornado | EF1 | 0 | 0 | 30.00K | 0.00K |
| KNOXVILLE ARPT | MARION CO. | IA | 06/05/2008 | 23:27 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| PRAIRIE CITY | JASPER CO. | IA | 06/05/2008 | 23:36 | CST-6 | Tornado | EF1 | 0 | 0 | 75.00K | 0.00K |
| BAXTER | JASPER CO. | IA | 06/05/2008 | 23:44 | CST-6 | Thunderstorm Wind | 50 kts. MG | 0 | 0 | 0.00K | 0.00K |
| REASNOR | JASPER CO. | IA | 06/05/2008 | 23:45 | CST-6 | Tornado | EF1 | 0 | 2 | 250.00K | 5.00K |
| NEWTON | JASPER CO. | IA | 06/05/2008 | 23:49 | CST-6 | Tornado | EF0 | 0 | 0 | 25.00K | 0.00K |
| PELLA | MARION CO. | IA | 06/05/2008 | 23:52 | CST-6 | Thunderstorm Wind | 50 kts. MG | 0 | 0 | 1.00K | 0.00K |
| GILMAN | MARSHALL CO. | IA | 06/06/2008 | 00:05 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 15.00K | 0.00K |
| DES MOINES | POLK CO. | IA | 06/06/2008 | 00:08 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| DES MOINES | POLK CO. | IA | 06/06/2008 | 00:08 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| DES MOINES | POLK CO. | IA | 06/06/2008 | 00:10 | CST-6 | Flash Flood | 0 | 0 | 10.00K | 0.00K | |
| PATTERSON | MADISON CO. | IA | 06/06/2008 | 00:10 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| WELLSBURG | GRUNDY CO. | IA | 06/06/2008 | 00:13 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 5.00K | 0.00K |
| URBANDALE | POLK CO. | IA | 06/06/2008 | 00:29 | CST-6 | Flash Flood | 0 | 0 | 25.00K | 0.00K | |
| NEW HARTFORD | BUTLER CO. | IA | 06/06/2008 | 00:30 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| DIKE | GRUNDY CO. | IA | 06/06/2008 | 00:30 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 100.00K | 0.00K |
| TAMA | TAMA CO. | IA | 06/06/2008 | 00:39 | CST-6 | Thunderstorm Wind | 55 kts. MG | 0 | 0 | 1.00K | 0.00K |
| CEDAR FALLS | BLACK HAWK CO. | IA | 06/06/2008 | 00:41 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 10.00K | 0.00K |
| PATTERSON | MADISON CO. | IA | 06/06/2008 | 00:41 | CST-6 | Flash Flood | 0 | 0 | 5.00K | 0.00K | |
| STORY CITY | STORY CO. | IA | 06/06/2008 | 00:42 | CST-6 | Flash Flood | 0 | 0 | 1.00K | 0.00K | |
| WATERLOO | BLACK HAWK CO. | IA | 06/06/2008 | 00:45 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 30.00K | 0.00K |
| TRIPOLI | BREMER CO. | IA | 06/06/2008 | 00:55 | CST-6 | Thunderstorm Wind | 51 kts. MG | 0 | 0 | 0.00K | 0.00K |
| CAMBRIDGE | STORY CO. | IA | 06/06/2008 | 01:54 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 0.00K | |
| CAMBRIDGE | STORY CO. | IA | 06/06/2008 | 02:30 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 0.00K | |
| NEVADA | STORY CO. | IA | 06/06/2008 | 08:10 | CST-6 | Flood | 0 | 0 | 20.00K | 0.00K | |
| Totals: | 0 | 2 | 1.173M | 37.00K |
