sweetapricity/bridgedeck-noaa huggingface dataset:
Afternoon and evening thunderstorms resulted in isolated reports of damaging wind gusts and large hail.

Thunderstorm Wind in CHATTOOGA, GEORGIA
From 15-JUL-17 12:35:00 to 15-JUL-17 12:50:00 (EST-5)
Location: WELCOME HILL
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

The Chattooga County 911 center reported trees blown down from around the intersections of Sand Pit Road at Creekside Road and Center Post Road at Cummings Road to around the intersection of Tatum Road and Ridgeway Road.

Thunderstorm Wind in FLOYD, GEORGIA
From 15-JUL-17 13:27:00 to 15-JUL-17 13:37:00 (EST-5)
Location: SILVER CREEK
Magnitude: 50.00 EG
Property damage: 4.00K
Reported by: 911 Call Center

The Floyd County 911 center reported a power line blown down near the intersection of Spur 101 S.E. and Nelson Street S.E.

Thunderstorm Wind in WHEELER, GEORGIA
From 15-JUL-17 16:05:00 to 15-JUL-17 16:25:00 (EST-5)
Location: GLENWOOD
Magnitude: 50.00 EG
Property damage: 7.00K
Reported by: Emergency Manager

The Wheeler County Emergency Manager reported eight or nine trees blown down around the intersection of Highways 19 and 46.

Hail in WHEELER, GEORGIA
From 15-JUL-17 16:00:00 to 15-JUL-17 16:10:00 (EST-5)
Location: GLENWOOD
Magnitude: 1.00 
Reported by: Emergency Manager

The Wheeler County Emergency Manager reported hail up to the size of quarters across the northern end of the county. Hail covered the ground around the intersection of Highways 19 and 46.

Thunderstorm Wind in WALKER, GEORGIA
From 15-JUL-17 12:16:00 to 15-JUL-17 12:26:00 (EST-5)
Location: COOPER HGTS
Magnitude: 45.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

The Walker County 911 center reported a tree blown down near the intersection of Highway 136 and Kensington Road.
A few isolated storms developed in the late afternoon and early evening hours on this Saturday. The first storms formed in a southwest-northeast oriented line roughly from McCook to Broken Bow to O'Neill around 2 PM CST. Most of these storms were weak, not lasting long. The most potent and persistent storms affected portions of Greeley, Howard, and Sherman Counties. However, even these storms did not last long, only affecting these counties between 4 and 730 PM CST. These storms did exhibit some supercell characteristics as they drifted slowly south while all other storms to the southwest moved southeast with the mean wind. One of these storms dropped south through eastern Greeley County and was responsible for producing estimated winds of 60 to 70 mph, with downed power lines in one known location. Another storm formed over the southwest part of the County and produced hail the size of half dollars near Scotia. The last severe thunderstorm formed over northern Howard County. This storm propagated due south across the County, producing significant severe hail. Hail up to the size of baseballs was reported in Loup City. One observer indicated that hail lasted around 20 minutes on the north side of town where the largest hail was the size of ping pong balls.
During the early morning hours on the previous day, a weak cool front dropped south across Nebraska with its western edge banked up against the Rockies. A weak low tracked southeast down the stalled portion of the front from Montana, eventually forcing the front eastward as it moved into South Dakota during the morning on this Saturday. As the day progressed, the front and weak low dropped into western and central Nebraska. The flow aloft was moderately amplified with a subtropical high over the Intermountain West and a trough over the Appalachians. Northwest flow was over the Central Plains. Just prior to the storms moving in, temperatures were in the lower 90s with dewpoints in the upper 50s and lower 60s. Mid-level lapse rates were poor, resulting in MLCAPE between 1000 and 1900 J/kg. Effective deep layer shear was 30 to 35 kts with 0-3 km SRH around 100 m2/s2.

Thunderstorm Wind in GREELEY, NEBRASKA
From 08-JUL-17 16:33:00 to 08-JUL-17 16:33:00 (CST-6)
Location: GREELEY
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts were estimated to be near 70 MPH. Power lines were knocked down in the area.

Hail in SHERMAN, NEBRASKA
From 08-JUL-17 18:20:00 to 08-JUL-17 18:40:00 (CST-6)
Location: LOUP CITY
Magnitude: 2.75 
Property damage: 2.00M
Crop damage: 500.00K
Reported by: Public

Hail up to the size of baseballs fell across Loup City, lasting about 20 minutes.

Thunderstorm Wind in GREELEY, NEBRASKA
From 08-JUL-17 17:11:00 to 08-JUL-17 17:11:00 (CST-6)
Location: WOLBACH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts were estimated to be near 60 MPH and were accompanied by pea sized hail.

Hail in GREELEY, NEBRASKA
From 08-JUL-17 17:40:00 to 08-JUL-17 17:40:00 (CST-6)
Location: SCOTIA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter
Showers and thunderstorms developed during the afternoon on the 7th and brought some strong winds to the region. In addition, a complex of storms that moved through the Ozarks overnight on July 8th, affected the ArkLaMiss region early on the 8th. This complex of storms produced an outflow boundary that moved through the region during the same afternoon. Some of these storms were strong to severe and contained some damaging winds.

Thunderstorm Wind in FORREST, MISSISSIPPI
From 07-JUL-17 16:10:00 to 07-JUL-17 16:10:00 (CST-6)
Location: MAXIE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A couple of trees were blown down and blocked Highway 49.

Thunderstorm Wind in HUMPHREYS, MISSISSIPPI
From 08-JUL-17 08:28:00 to 08-JUL-17 08:28:00 (CST-6)
Location: BELZONI
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A power line was blown down on Wiley Street.
Two separate areas of convection developed which eventually moved parallel across the southern TX Panhandle by evening hours. The first area of convection developed diurnally across eastern NM and moved southeast across parts of the central and western TX Panhandle along a pronounced 850-700 moisture axis with good SBCAPE of 1000-2000 J/Kg. A second area of convection developed across the northeastern Panhandles associated with a southeastward propagating 500 hPa trough. Across the second region of storm development, better effective shear supported supercells with large hail at first before storms congealed into a line and became more of a wind threat. Both complexes of storms produced many wind and large hail reports before exiting the region the evening of the 3rd.

Hail in BEAVER, OKLAHOMA
From 03-JUL-17 16:05:00 to 03-JUL-17 16:05:00 (CST-6)
Location: LOGAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported.
A very unstable airmass aided the development of numerous thunderstorms. Some of the storms produced 50 to 60 mph winds and very heavy rain.

Thunderstorm Wind in JACKSON, MISSISSIPPI
From 25-JUL-17 12:00:00 to 25-JUL-17 12:00:00 (CST-6)
Location: OCEAN SPGS ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A report was received of awnings and metal carports being damaged or destroyed by estimated 50 to 60 mph winds on Elm Avenue. The damage included a metal shed at a fire station.
Strong afternoon heating combined with strong instability to intensify thunderstorms. A couple of these thunderstorms did result in wind damage.

Thunderstorm Wind in PENDER, NORTH CAROLINA
From 06-JUL-17 13:30:00 to 06-JUL-17 13:31:00 (EST-5)
Location: WOODSIDE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Trees were reportedly down, a flag pole was snapped and outdoor furniture was blown around on one property on Pinnacle Pkwy.
Storms developed during the overnight hours with a few of those storms producing wind and hail. Then late in the morning of the same day, storms moved out of southeast South Dakota into northwest Iowa and also produced hail and wind that damaged trees.

Thunderstorm Wind in PLYMOUTH, IOWA
From 21-AUG-17 13:45:00 to 21-AUG-17 13:45:00 (CST-6)
Location: LE MARS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree damage was reported on the northwest side of the town.

Hail in CLAY, IOWA
From 21-AUG-17 01:05:00 to 21-AUG-17 01:05:00 (CST-6)
Location: DICKENS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LYON, IOWA
From 21-AUG-17 10:48:00 to 21-AUG-17 10:48:00 (CST-6)
Location: ROCK RAPIDS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OSCEOLA, IOWA
From 21-AUG-17 10:57:00 to 21-AUG-17 10:57:00 (CST-6)
Location: SIBLEY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Reported by the Emergency Manager.
A weak monsoon pattern that had persisted for several days produced 2 separate isolated supercell thunderstorms over the San Diego County desert late in the afternoon on the 12th. The storm was fueled by a surge in low level moisture late in the day. Storm tops exceeded 60,000 ft and storm top divergence was near 100 kt.

Thunderstorm Wind in SAN DIEGO, CALIFORNIA
From 12-AUG-17 16:25:00 to 12-AUG-17 16:35:00 (PST-8)
Location: AGUA CALIENTE SPGS
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Canebrake reported two car ports destroyed, numerous large tree limbs down and a roof folded over on a home.

Flash Flood in SAN DIEGO, CALIFORNIA
From 12-AUG-17 16:30:00 to 12-AUG-17 17:30:00 (PST-8)
Location: AGUA CALIENTE SPGS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several roads were washed out in Canebrake, while rocks and debris covered a section of the S2. Plows were required to clear roads in Canebrake.

Flash Flood in SAN DIEGO, CALIFORNIA
From 12-AUG-17 16:10:00 to 12-AUG-17 18:00:00 (PST-8)
Location: OCOTILLO WELLS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: County Official

Rain rates exceeding 1 inch per hour produced major flooding in the Fish Creek Wash. Flow filled the slot canyon, and deposited several feet of mud and debris at the mouth of the canyon. Several hikers were stranded, but no injuries occurred.
Relatively longer term dry conditions combined with acute short term precipitation deficits led to drought conditions in southern Iowa.

Drought in CLARKE, IOWA
From 25-JUL-17 00:00:00 to 31-JUL-17 23:59:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Drought Monitor

Acute short term dryness has led to severe drought conditions across the county.

Drought in DECATUR, IOWA
From 25-JUL-17 00:00:00 to 31-JUL-17 23:59:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Drought Monitor

Acute short term dryness has led to severe drought conditions across the county.

Drought in LUCAS, IOWA
From 25-JUL-17 00:00:00 to 31-JUL-17 23:59:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Drought Monitor

Acute short term dryness has led to severe drought conditions across the county.

Drought in WAYNE, IOWA
From 25-JUL-17 00:00:00 to 31-JUL-17 23:59:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Drought Monitor

Acute short term dryness has led to severe drought conditions across portions of the county.
River flooding occurred on the Des Moines River at Estherville in late October.

Flood in EMMET, IOWA
From 06-OCT-17 23:30:00 to 19-OCT-17 20:00:00 (CST-6)
Location: WELLINGFORD
Flood cause: Heavy Rain
Property damage: 80.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The West Fork of the Des Moines River at Estherville crested at 9.85 feet on 12 October 2017 at 06:45 UTC.
A severe thunderstorm produced one inch hail near the town of Wascott.

Hail in DOUGLAS, WISCONSIN
From 25-JUL-17 21:20:00 to 25-JUL-17 21:20:00 (CST-6)
Location: WASCOTT
Magnitude: 1.00 
Reported by: Trained Spotter
A fairly typical cold frontal passage moved through Iowa during the evening of the 16th and into the 17th of September.  The antecedent conditions were generally temperatures in the mid to upper 70s, dew points in the upper 60s, resulting in MUCAPE values in the 1000-2000 J/kg range, and effective bulk shear values under 30 kts. The setup called for and resulted in relatively progressive storms with the cold front ushering them through, but with flow parallel to the front, storms were able to train over areas for a short while.  No severe weather was reported, but heavy rainfall did occur.

Heavy Rain in ADAIR, IOWA
From 16-SEP-17 21:45:00 to 17-SEP-17 01:00:00 (CST-6)
Location: FONTANELLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.30 inches storm total.
Elevated storms were the name of the game in the morning of the 14th before surface based convection later in the day.  A surface low pressure center slowly made its way out of South Dakota and into parts of western and central Iowa.  The morning round of elevated storms were strongest across northern Iowa within an environment of 500-1000 J/kg MUCAPE and effective bulk shear values around 30 to 40 kts.  While most storms were sub-severe, a couple were able to produce damaging winds and hail.  By the afternoon, much of the state found itself within the weak warm sector and was able to experience some weak surface based convection. As a result, no noteworthy storms developed, but a pair of funnel cloud reports were received.

Thunderstorm Wind in FRANKLIN, IOWA
From 14-AUG-17 03:45:00 to 14-AUG-17 03:45:00 (CST-6)
Location: ALEXANDER
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported a large machine shed partially destroyed, partial roof damage, a hog building with door damage and tin ripped up, and grain storage bins with damage to 2 doors.  This is a delayed report and time estimated from radar.

Hail in STORY, IOWA
From 14-AUG-17 05:30:00 to 14-AUG-17 05:30:00 (CST-6)
Location: NEVADA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported brief pea to quarter sized hail between Nevada and Colo on Highway 30.
A severe thunderstorm produced golf-ball sized hail northwest of the town of Winter.

Hail in SAWYER, WISCONSIN
From 22-JUL-17 19:10:00 to 22-JUL-17 19:18:00 (CST-6)
Location: WINTER
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in SAWYER, WISCONSIN
From 22-JUL-17 18:58:00 to 22-JUL-17 19:02:00 (CST-6)
Location: WINTER
Magnitude: 1.75 
Reported by: Trained Spotter
A cold front found itself moving across Iowa from northwest to southeast during the day and was able to initiate a number of strong storms.  With observations around 90 degrees for highs with dew points well into the 70s, MUCAPE values exceeded 3500 J/kg along with 25-35 kts of effective bulk shear.  While indications are that there was not significant 0-1 km helicity, initial storms along the boundary generated a few funnel clouds before strengthening and eventually producing marginal severe hail and a few damaging wind reports.

Hail in GUTHRIE, IOWA
From 12-JUL-17 14:48:00 to 12-JUL-17 14:48:00 (CST-6)
Location: HERNDON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported nickel sized hail.

Thunderstorm Wind in TAMA, IOWA
From 12-JUL-17 16:58:00 to 12-JUL-17 16:58:00 (CST-6)
Location: TAMA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Media reported a tree down on the golf course and other smaller limbs down around town.

Funnel Cloud in HARDIN, IOWA
From 12-JUL-17 14:40:00 to 12-JUL-17 14:40:00 (CST-6)
Location: ABBOTT CROSSING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Iowa State Patrol relayed public reports of a funnel cloud.

Funnel Cloud in HAMILTON, IOWA
From 12-JUL-17 14:15:00 to 12-JUL-17 14:15:00 (CST-6)
Location: ELLSWORTH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public shared images of a funnel cloud near Radcliffe off of Interstate 35.
A few storms occurred through the early morning hours on the 15th with one storm producing some wind damage to a farmstead in eastern Crawford County.

Thunderstorm Wind in CRAWFORD, IOWA
From 15-SEP-17 05:35:00 to 15-SEP-17 05:35:00 (CST-6)
Location: VAIL
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Damage was done to outbuildings and trees on the farmstead.
A few showers were around and one produced a funnel cloud near St. Joseph.

Funnel Cloud in HUMBOLDT, IOWA
From 13-AUG-17 12:30:00 to 13-AUG-17 12:30:00 (CST-6)
Location: LIVERMORE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a funnel cloud near US Hwy 169 just south of St. Joseph.

Funnel Cloud in HANCOCK, IOWA
From 13-AUG-17 13:21:00 to 13-AUG-17 13:21:00 (CST-6)
Location: HUTCHINS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Public reported a funnel cloud via social media.  This is a delayed report and time estimated from radar.
A weak frontal boundary floated around Iowa for a few days, acting as an area to initiate  afternoon thunderstorms.  In the vast majority of cases storms were sub-severe, but a few were near-severe to severe with regards to hail and wind within daily environments of 2000-3000 MUCAPE at times and effective bulk shear under 25 kts.

Hail in KOSSUTH, IOWA
From 02-JUL-17 15:02:00 to 02-JUL-17 15:02:00 (CST-6)
Location: ST BENEDICT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chase reported nickel sized hail.

Hail in DECATUR, IOWA
From 03-JUL-17 13:45:00 to 03-JUL-17 13:45:00 (CST-6)
Location: VAN WERT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported dime to nickel sized hail and very heavy rainfall, including some ditches full.

Hail in HARDIN, IOWA
From 03-JUL-17 18:52:00 to 03-JUL-17 18:52:00 (CST-6)
Location: UNION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter sized hail.

Thunderstorm Wind in WAPELLO, IOWA
From 03-JUL-17 17:24:00 to 03-JUL-17 17:24:00 (CST-6)
Location: OTTUMWA
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported the roof blown off of a garage.  The is a delayed report.

Hail in GREENE, IOWA
From 03-JUL-17 21:15:00 to 03-JUL-17 21:15:00 (CST-6)
Location: PATON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Thunderstorm Wind in WARREN, IOWA
From 04-JUL-17 15:05:00 to 04-JUL-17 15:05:00 (CST-6)
Location: SCOTCH RIDGE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported a power line down and tree limbs down.  This is a delayed report.
A weak boundary found itself situated across parts of northern Iowa during the afternoon and initiated a number of storms during the afternoon and evening hours.  The environment, while unstable with 2000-3000 J/kg MUCAPE, was generally unsupportive for severe storm development.  An initial storm along the front was able to experience enough low level spin and stretching to produce a funnel cloud report in Cerro Gordo County.

Funnel Cloud in CERRO GORDO, IOWA
From 18-JUL-17 14:15:00 to 18-JUL-17 14:15:00 (CST-6)
Location: CLEAR LAKE LAKE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a funnel cloud.

Funnel Cloud in WORTH, IOWA
From 18-JUL-17 18:40:00 to 18-JUL-17 18:40:00 (CST-6)
Location: FREEMAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported a funnel cloud near Manly.
Several severe thunderstorms moved across northern Wisconsin and produced large hail and strong, gusty winds. Hail stones ranged in size from dime size up to a hen's egg size. The winds blew down several trees.

Hail in BAYFIELD, WISCONSIN
From 06-JUL-17 17:30:00 to 06-JUL-17 17:30:00 (CST-6)
Location: DRUMMOND
Magnitude: 1.00 
Reported by: Public

Hail in ASHLAND, WISCONSIN
From 06-JUL-17 17:36:00 to 06-JUL-17 17:36:00 (CST-6)
Location: ASHLAND
Magnitude: 1.00 
Reported by: Public

Hail in SAWYER, WISCONSIN
From 06-JUL-17 18:08:00 to 06-JUL-17 18:08:00 (CST-6)
Location: HAYWARD ARPT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SAWYER, WISCONSIN
From 06-JUL-17 18:21:00 to 06-JUL-17 18:21:00 (CST-6)
Location: WINTER
Magnitude: 1.00 
Reported by: Public

Hail in SAWYER, WISCONSIN
From 06-JUL-17 18:33:00 to 06-JUL-17 18:33:00 (CST-6)
Location: ROUND LAKE
Magnitude: 0.75 
Reported by: Amateur Radio

Hail in SAWYER, WISCONSIN
From 06-JUL-17 18:37:00 to 06-JUL-17 18:37:00 (CST-6)
Location: STONE LAKE
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in WASHBURN, WISCONSIN
From 06-JUL-17 19:02:00 to 06-JUL-17 19:02:00 (CST-6)
Location: SPOONER
Magnitude: 0.75 
Reported by: Trained Spotter

Thunderstorm Wind in SAWYER, WISCONSIN
From 06-JUL-17 17:45:00 to 06-JUL-17 17:45:00 (CST-6)
Location: HAYWARD ARPT
Magnitude: 56.00 EG
Reported by: Public

Several trees were blown down and some were uprooted. One fallen tree damaged a wooden fence. Another tree was struck by lightning.
A bow-like thunderstorm moved across from Minnesota into Wisconsin producing strong winds that caused tree damage in Burnett County on the evening of July 17th. The winds knocked down a large tree that subsequently blocked a lane of traffic between Oakland and Jackson Township in Wisconsin.

Thunderstorm Wind in BURNETT, WISCONSIN
From 17-JUL-17 19:25:00 to 17-JUL-17 19:25:00 (CST-6)
Location: DANBURY
Magnitude: 56.00 EG
Reported by: State Official

A tree that was blown down on County Road T blocked a lane of traffic between Oakland and Jackson townships.
A strong cold front made its way across Iowa from west to east throughout the day and evening on October 21st.  The progressive cold front triggered a line of storms that was able to utilize an environment with around 500 to 1000 J/kg of MUCAPE and effective shear north of 40 kts. Even so, only a lone severe report was received north of the city of Ottumwa, near Fremont.  Otherwise, predominantly brief heavy rainfall and lighting were the main issues with the linear storms.

Thunderstorm Wind in MAHASKA, IOWA
From 21-OCT-17 20:20:00 to 21-OCT-17 20:20:00 (CST-6)
Location: OSKALOOSA MUNI ARPT
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported power lines down and a machine shed damaged near the intersection of Urbana Ave and Highway 23.  The road was blocked due to downed power lines.  This is a delayed report and time estimated from radar.