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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 52 kts. |
| State | IOWA |
| County/Area | PALO ALTO |
| WFO | DMX |
| Begin Date | 08/23/2011 01:14:00 CST-6 |
| Begin Range | 1 |
| Begin Azimuth | SE |
| Begin Location | EMMETSBURG |
| Begin Lat/Lon | 43.11/-94.68 |
| End Date | 08/23/2011 01:14:00 CST-6 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 10.00K |
| Crop Damage | 0.00K |
| Episode Narrative | Strong warm air advection took place over Iowa during the night of the 22nd into the morning of the 23rd. A low level jet of over 40 kts developed, transporting moisture into the state. Precipitable water values increased to between 1.7 and 2 inches over northwest into central Iowa. CAPE was in the 2000 to 4000 J/kg range to the southwest of the precipitable water maximum, with lifted indices of -6 to -10. Thunderstorms formed over South Dakota and moved into northwest and north central Iowa. The storms produced both hail and high winds as they advanced into the state. Downdraft CAPE was quite high with 1200 to 1400 J/kg available. CAPE in the -10 to -30 C layer of the atmosphere was between 500 and 1000 J/kg, however a very high freezing level limited the size of the hail as the freezing level was around 15,000 feet. The atmosphere was moderately sheared with 35 to 45 kts of shear available. By far the predominant mode of severe weather was the high winds. Trees were uprooted in Palo Alto County at Emmetsburg. Several other reports of winds of 60 to 70 MPH were received in Palo Alto and Kossuth County. A mesonet station northeast of Whittemore recorded a 75 MPH wind gust, with 68 MPH winds recorded at the Algona Airport for example. In Webster County, one inch diameter hail fell north of the Fort Dodge Airport. As the thunderstorms progressed eastward, the intensity diminished. There were spotty reports of high winds and hail across north central and parts of northeast Iowa. Scattered thunderstorms developed behind the main area before sunrise. For the most part they were not severe, but did produce high winds and some nickel to quarter size hail. |
| Event Narrative | Patio furniture was blown around and branches were down in the yard. |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 231.00K | 275.00K | |||||||
| EMMETSBURG | PALO ALTO CO. | IA | 08/23/2011 | 01:14 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| EMMETSBURG | PALO ALTO CO. | IA | 08/23/2011 | 01:14 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 50.00K | 10.00K |
| WHITTEMORE | KOSSUTH CO. | IA | 08/23/2011 | 01:35 | CST-6 | Thunderstorm Wind | 65 kts. MG | 0 | 0 | 25.00K | 50.00K |
| ALGONA | KOSSUTH CO. | IA | 08/23/2011 | 01:37 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| ALGONA | KOSSUTH CO. | IA | 08/23/2011 | 01:40 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 50.00K | 0.00K |
| ALGONA MUNI ARPT | KOSSUTH CO. | IA | 08/23/2011 | 01:40 | CST-6 | Thunderstorm Wind | 59 kts. MG | 0 | 0 | 10.00K | 5.00K |
| BRITT | HANCOCK CO. | IA | 08/23/2011 | 02:00 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| (FOD)FT DODGE MUNI A | WEBSTER CO. | IA | 08/23/2011 | 02:20 | CST-6 | Hail | 1.00 in. | 0 | 0 | 3.00K | 25.00K |
| WEBSTER CITY | HAMILTON CO. | IA | 08/23/2011 | 02:36 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 50.00K | 0.00K |
| WEBSTER CITY ARPT | HAMILTON CO. | IA | 08/23/2011 | 04:52 | CST-6 | Hail | 1.00 in. | 0 | 0 | 2.00K | 10.00K |
| KAMRAR | HAMILTON CO. | IA | 08/23/2011 | 04:57 | CST-6 | Hail | 1.00 in. | 0 | 0 | 1.00K | 20.00K |
| KAMRAR | HAMILTON CO. | IA | 08/23/2011 | 05:06 | CST-6 | Hail | 0.88 in. | 0 | 0 | 0.00K | 5.00K |
| JOICE | WORTH CO. | IA | 08/23/2011 | 05:52 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| NORTHWOOD MUNI ARPT | WORTH CO. | IA | 08/23/2011 | 05:58 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 10.00K | 150.00K |
| Totals: | 0 | 0 | 231.00K | 275.00K |
