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Storm Events Database
Event Details:
| Event | Tornado |
| -- Scale | EF1 |
| -- Length | 1.58 Miles |
| -- Width | 120 Yards |
| State | IOWA |
| County/Area | MARION |
| WFO | DMX |
| Report Source | NWS Storm Survey |
| NCEI Data Source | CSV |
| Begin Date | 2019-08-20 05:21 CST-6 |
| Begin Location | 1SW TRACY |
| Begin Lat/Lon | 41.2693/-92.9008 |
| End Date | 2019-08-20 05:23 CST-6 |
| End Location | 1SE TRACY |
| End Lat/Lon | 41.2753/-92.8715 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 15.00K |
| Crop Damage | 0.20K |
| Episode Narrative | Generally speaking, a bit of everything occurred during an overnight/early morning severe mesoscale convective system that rolled across Iowa. The predominant weather revolved around damaging winds and heavy rainfall, though a few instances of severe hail and low end tornadoes were experienced as well. Among the reports, numerous trees were downed, buildings damaged or destroyed from straight line winds or one of the weak tornadoes, and numerous instances of 2 to 4 plus inches of heavy rainfall. On the setup side of the coin, a lot of factors were in line for the event to potentially be a sustained nocturnal severe weather event. The previous day, the 19th, saw surface high pressure begin to exit the region eastward and allowing southerly return flow to work into eastern Nebraska and western Iowa. Tied in with mid to upper 70 dew points and steep mid-level lapse rates, a large area of 4000 plus J/kg CAPE values developed across eastern Nebraska and western Iowa and slowly built eastward. Additionally, effect bulk shear was consistently in the 40 to 50 kt range and low level shear roughly oriented to expected storm motion. As the evening progressed and the low level jet finally began to ramp up, boosting warm air advection and positive moisture flux, storms began to develop and eventually congeal. Organization, at least with regards to strong to severe criteria, was not immediate, waiting until around 5am local time to produce its first severe report. Severe reports then continued as the system moved southeast over the next 4 plus hours. |
| Event Narrative | The last of three tornadoes produced by a fast moving QLCS. Tornado began west of Tracy in rural areas producing only crop and tree damage. As the tornado moved through town, it produced mainly tree and minor structural damage to buildings in the town. The tornado dissipated on the east side of Tracy. |
Event Map:
Note: The tornado track is approximate based on the beginning (B) and ending (E) locations. The actual tornado path may differ from a straight line.
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 1 | 746.00K | 1.70K | |||||||
| (DSM)DES MOINES INTL | POLK CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| ADEL | DALLAS CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| CARROLL | CARROLL CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| CLUTIER | TAMA CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| DAKOTA CITY | HUMBOLDT CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| DIKE | GRUNDY CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| GUTHRIE CENTER | GUTHRIE CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| IOWA FALLS | HARDIN CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| JAMAICA | GUTHRIE CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| TRAER MUNI ARPT | TAMA CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| WINDSOR HGTS | POLK CO. | IA | 08/19/2019 | 06:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| DEPEW | PALO ALTO CO. | IA | 08/20/2019 | 01:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| IOWA CENTER | STORY CO. | IA | 08/20/2019 | 01:15 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| EAGLE GROVE | WRIGHT CO. | IA | 08/20/2019 | 01:40 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| LIVERMORE | HUMBOLDT CO. | IA | 08/20/2019 | 01:50 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| ADEL | DALLAS CO. | IA | 08/20/2019 | 03:30 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| CLIVE | POLK CO. | IA | 08/20/2019 | 03:45 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| HADDEN HILL | DALLAS CO. | IA | 08/20/2019 | 03:50 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 1.00K | 0.00K |
| NEW VIRGINIA | WARREN CO. | IA | 08/20/2019 | 04:00 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| ADAIR | GUTHRIE CO. | IA | 08/20/2019 | 04:13 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 0.00K |
| CASEY | GUTHRIE CO. | IA | 08/20/2019 | 04:14 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 0.00K |
| ADAIR | ADAIR CO. | IA | 08/20/2019 | 04:15 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 60.00K | 0.00K |
| ADAIR | GUTHRIE CO. | IA | 08/20/2019 | 04:20 | CST-6 | Thunderstorm Wind | 52 kts. MG | 0 | 0 | 0.00K | 0.00K |
| WINTERSET ARPT | MADISON CO. | IA | 08/20/2019 | 04:21 | CST-6 | Tornado | EF1 | 0 | 0 | 5.00K | 0.50K |
| URBANDALE | POLK CO. | IA | 08/20/2019 | 04:25 | CST-6 | Thunderstorm Wind | 50 kts. EG | 0 | 0 | 0.00K | 0.00K |
| INDIANOLA ARPT | WARREN CO. | IA | 08/20/2019 | 04:27 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 20.00K | 0.00K |
| HADDEN HILL | DALLAS CO. | IA | 08/20/2019 | 04:28 | CST-6 | Hail | 0.75 in. | 0 | 0 | 0.00K | 0.00K |
| URBANDALE | POLK CO. | IA | 08/20/2019 | 04:29 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 0.00K | 0.00K |
| CLOVER HILLS | POLK CO. | IA | 08/20/2019 | 04:30 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 5.00K | 0.00K |
| INDIANOLA ARPT | WARREN CO. | IA | 08/20/2019 | 04:55 | CST-6 | Tornado | EF3 | 0 | 0 | 350.00K | 1.00K |
| LIBERTY CENTER | WARREN CO. | IA | 08/20/2019 | 04:59 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 30.00K | 0.00K |
| LACONA | WARREN CO. | IA | 08/20/2019 | 05:00 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 100.00K | 0.00K |
| MILO | WARREN CO. | IA | 08/20/2019 | 05:01 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 0.00K |
| WILLIAMSON | LUCAS CO. | IA | 08/20/2019 | 05:10 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 0.00K |
| CHARITON MUNI ARPT | LUCAS CO. | IA | 08/20/2019 | 05:15 | CST-6 | Thunderstorm Wind | 50 kts. MG | 0 | 0 | 0.00K | 0.00K |
| RED ROCK | MARION CO. | IA | 08/20/2019 | 05:18 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 1 | 20.00K | 0.00K |
| GRIMES | POLK CO. | IA | 08/20/2019 | 05:19 | CST-6 | Lightning | 0 | 0 | 50.00K | 0.00K | |
| TRACY | MARION CO. | IA | 08/20/2019 | 05:21 | CST-6 | Tornado | EF1 | 0 | 0 | 15.00K | 0.20K |
| GRINNELL ARPT | POWESHIEK CO. | IA | 08/20/2019 | 05:30 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 50.00K | 0.00K |
| OTTUMWA | WAPELLO CO. | IA | 08/20/2019 | 05:53 | CST-6 | Thunderstorm Wind | 50 kts. MG | 0 | 0 | 0.00K | 0.00K |
| ALGONA | KOSSUTH CO. | IA | 08/20/2019 | 08:10 | CST-6 | Hail | 1.50 in. | 0 | 0 | 0.00K | 0.00K |
| Totals: | 0 | 1 | 746.00K | 1.70K |
