Storm Events Database

Storm Events Database

Event Details:

Event Tornado
-- Scale EF0
-- Length 1.37 Miles
-- Width 80 Yards
State IOWA
County/Area STORY
WFO DMX
Report Source NWS Storm Survey
NCEI Data Source CSV
Begin Date 2017-08-21 16:54 CST-6
Begin Location 2SW KELLEY
Begin Lat/Lon 41.9304/-93.6981
End Date 2017-08-21 16:55 CST-6
End Location 2S KELLEY
End Lat/Lon 41.9223/-93.6739
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 0.00K
Crop Damage 4.00K
Episode Narrative With the help of a couple weak boundaries in the area, storms initiated on the nose of the low level jet and generally remained over the same areas overnight. The primary result of the storms was heavy rainfall, though a few initial storms were able to produce damaging winds and severe hail within 2000+ J/kg CAPE and borderline effective bulk shear around 30 kts. Other than the few initial severe storm reports, total rainfall reports exceeded 5 inches in some locations. During the afternoon and evening on the 21st, ahead of a cold front, storms once again initiated and produced primarily sub-severe winds and hail, though two weak tornadoes and one severe wind gust were reported.
Event Narrative Tornado found in hi-resolution satellite imagery. This tornado entered from Boone county and stayed in open row crops, mainly corn where the path was very visible in the imagery.


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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.
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Measure
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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 16.00K 12.00K
AUDUBON ARPT AUDUBON CO. IA 08/20/2017 05:55 CST-6 Heavy Rain 0 0 0.00K 0.00K
ADAIR ADAIR CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
ANITA MUNI ARPT CASS CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
ATLANTIC CASS CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
DENISON CRAWFORD CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MANNING CARROLL CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MASSENA CASS CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SAYDELL POLK CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SCHLESWIG CRAWFORD CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SHULER MINE DALLAS CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SWEA CITY KOSSUTH CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
WALL LAKE SAC CO. IA 08/20/2017 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
SHULER MINE DALLAS CO. IA 08/20/2017 06:15 CST-6 Heavy Rain 0 0 0.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 08/20/2017 07:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
LOVINGTON POLK CO. IA 08/20/2017 07:01 CST-6 Heavy Rain 0 0 0.00K 0.00K
ATLANTIC CASS CO. IA 08/20/2017 07:15 CST-6 Heavy Rain 0 0 0.00K 0.00K
DENISON CRAWFORD CO. IA 08/20/2017 21:40 CST-6 Heavy Rain 0 0 0.00K 0.00K
DENISON CRAWFORD CO. IA 08/20/2017 21:40 CST-6 Heavy Rain 0 0 0.00K 0.00K
AUDUBON AUDUBON CO. IA 08/20/2017 22:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
HERROLD POLK CO. IA 08/20/2017 23:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 08/20/2017 23:15 CST-6 Heavy Rain 0 0 0.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 08/20/2017 23:15 CST-6 Heavy Rain 0 0 0.00K 0.00K
DES MOINES POLK CO. IA 08/21/2017 01:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
ATLANTIC ARPT CASS CO. IA 08/21/2017 01:05 CST-6 Thunderstorm Wind 50 kts. MG 0 0 0.00K 0.00K
RUTHVEN PALO ALTO CO. IA 08/21/2017 01:08 CST-6 Hail 1.00 in. 0 0 0.00K 0.00K
ATLANTIC CASS CO. IA 08/21/2017 01:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 1.00K 0.00K
ATLANTIC CASS CO. IA 08/21/2017 01:20 CST-6 Thunderstorm Wind 56 kts. EG 0 0 10.00K 0.00K
AUDUBON AUDUBON CO. IA 08/21/2017 02:15 CST-6 Flash Flood 0 0 0.00K 0.00K
NAPIER BOONE CO. IA 08/21/2017 16:52 CST-6 Tornado EF0 0 0 5.00K 5.00K
KELLEY STORY CO. IA 08/21/2017 16:54 CST-6 Tornado EF0 0 0 0.00K 4.00K
MIDVALE STORY CO. IA 08/21/2017 16:58 CST-6 Tornado EF0 0 0 0.00K 3.00K
BROOKLYN POWESHIEK CO. IA 08/21/2017 18:05 CST-6 Thunderstorm Wind 52 kts. EG 0 0 0.00K 0.00K
Totals: 0 0 16.00K 12.00K