Generally speaking, there was not much to write home about with regards to the synoptic setup for severe or highly impactful weather. Even so, an environment with nominal MUCAPE (often under 1000 J/kg), high shear (0-1km shear in excess of 30 kts, 0-1km helicity in excess of 200 m2/s2), and consistent low level moisture transport was able to produce weak, brief tornadoes and sustained periods of moderate to heavy rainfall.
Specifically on the tornadoes, two brief weak tornadoes occurred in the relatively low CAPE, high shear environment in central Iowa.  Little impact was observed from the tornadoes as they stayed in rural areas and away from structures and towns.
On the rainfall front, multiple rounds of showers and storms produced numerous reports of 2 to 3 inches of rainfall throughout southern Iowa, even trickling north into central Iowa in a few instances.

Hail in WARREN, IOWA
From 21-SEP-19 23:40:00 to 21-SEP-19 23:40:00 (CST-6)
Location: CLARKSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Time and exact location estimated from radar.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: CENTERVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 3.60 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: GENOA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.35 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: ALLERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.19 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: HARVARD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.00 inches over the last 24 hours.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: CENTERVILLE ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Centerville Municipal Airport AWOS recorded heavy rainfall of 3.01 inches over the last 24 hours.

Heavy Rain in CLARKE, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.16 inches over the last 24 hours.

Heavy Rain in DECATUR, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: (30I)LAMONI MUNI ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.07 inches over the last 24 hours.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 07:10:00 to 22-SEP-19 07:10:00 (CST-6)
Location: CENTERVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 3.75 inches over the last 24 hours.

Heavy Rain in WAPELLO, IOWA
From 21-SEP-19 07:52:00 to 22-SEP-19 07:52:00 (CST-6)
Location: BLAKESBURG ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.09 inches over the last 24 hours.

Heavy Rain in WEBSTER, IOWA
From 21-SEP-19 07:56:00 to 22-SEP-19 07:56:00 (CST-6)
Location: (FOD)FT DODGE MUNI A
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Fort Dodge Regional Airport AWOS recorded heavy rainfall of 2.56 inches over the last 24 hours.

Tornado in POLK, IOWA
From 21-SEP-19 23:53:00 to 21-SEP-19 23:55:00 (CST-6)
Location: BONDURANT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.20K
Reported by: NWS Employee

The tornado was suggested by a TDS observed on radar and subsequently confirmed via high resolution satellite data.  The tornado remained in either wooded areas or open cropland with no damage noted, therefore the EF-U rating.

Tornado in JASPER, IOWA
From 22-SEP-19 00:03:00 to 22-SEP-19 00:04:00 (CST-6)
Location: MINGO
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.10K
Reported by: NWS Employee

Tornado was suggested by a TDS on radar and subsequently confirmed via high resolution satellite imagery.   A short path through rural cropland, hence the EF-U rating.

Heavy Rain in RINGGOLD, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: BEACONSFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.10 inches over the last 24 hours.

Heavy Rain in UNION, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: LORIMOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.31 inches over the last 24 hours.

Heavy Rain in WAPELLO, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: OTTUMWA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.57 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: ALLERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.09 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 06:00:00 to 22-SEP-19 06:00:00 (CST-6)
Location: ALLERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.09 inches over the last 24 hours.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: PLANO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.80 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 21-SEP-19 08:00:00 to 22-SEP-19 08:00:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station recorded heavy rainfall of 2.08 inches over the last 24 hours.

Heavy Rain in MARION, IOWA
From 21-SEP-19 16:00:00 to 22-SEP-19 16:00:00 (CST-6)
Location: BUSSEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.50 inches. Time duration unknown. Set at 24 hours for this report.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 12:00:00 to 22-SEP-19 12:00:00 (CST-6)
Location: FORBUSH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.25 inches. Time duration unknown. Set at 24 hours for the report.

Heavy Rain in LUCAS, IOWA
From 21-SEP-19 17:00:00 to 22-SEP-19 17:00:00 (CST-6)
Location: CHARITON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported heavy rainfall of 2.10 inches as a 24 hour report ending at 6pm this evening.

Heavy Rain in APPANOOSE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: ICONIUM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.13 inches over the last 24 hours.

Heavy Rain in CLARKE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.19 inches over the last 24 hours.

Heavy Rain in DAVIS, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: DRAKESVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.15 inches over the last 24 hours.

Heavy Rain in MADISON, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: EARLHAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.12 inches over the last 24 hours.

Heavy Rain in STORY, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: IOWA CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.57 inches over the last 24 hours.

Heavy Rain in STORY, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: MAXWELL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.60 inches over the last 24 hours.

Heavy Rain in WAYNE, IOWA
From 21-SEP-19 07:00:00 to 22-SEP-19 07:00:00 (CST-6)
Location: CORYDON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.70 inches over the last 24 hours.