A deep trough embedded within the southern stream of the jet, combined with unseasonably rich moisture to bring widespread flooding and a regional severe weather outbreak to the Lower Ohio Valley during the afternoon and evening of December 21st.  Heavy rains, in the order of 2 to locally as much as 3 inches, developed during the morning hours across southern Indiana. Additional rains during the afternoon and early evening brought storm total rainfall of 3 to locally in excess of 4 inches.  These heavy rains, augmented by a December record 1.7 inches of precipitable water, developed   along a stationary front that lay along but just north of the Ohio River from Cairo, IL to Cincinnati.
By early afternoon, low pressure deepened as it moved northeast across central Illinois and northern Indiana. Rains ceased by mid-day as extreme southern Indiana fell within the warm sector of the developing cyclone. Record high temperatures in the lower 70s arrived by late afternoon.  A squall line developed by mid-afternoon from southern Illinois southwards along the Mississippi River. This line of storms, fueled by ample moisture and an exceptionally strong low level jet in excess of 50 kts, became severe as it moved across southern Indiana during the early evening hours. Several locations in southern Indiana recorded damaging winds, both from the squall line and from strong gradient winds just prior to to the line's arrival.

Flood in WASHINGTON, INDIANA
From 22-DEC-13 01:45:00 to 22-DEC-13 11:45:00 (EST-5)
Location: FREDDRICKSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Widespread heavy rains during the afternoon and evening hours on the 21st of December led to minor flooding of the Blue River at Fredricksburg. Flood stage is 20 feet, and the river crested at 12.4 feet around noon on the 22nd.

Thunderstorm Wind in CRAWFORD, INDIANA
From 21-DEC-13 20:11:00 to 21-DEC-13 20:11:00 (EST-5)
Location: ECKERTY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported several trees down across the western portion of Crawford County.

Thunderstorm Wind in CRAWFORD, INDIANA
From 21-DEC-13 20:21:00 to 21-DEC-13 20:21:00 (EST-5)
Location: LEAVENWORTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported that a large pine tree was blown down.

Thunderstorm Wind in FLOYD, INDIANA
From 21-DEC-13 20:37:00 to 21-DEC-13 20:37:00 (EST-5)
Location: FLOYDS KNOBS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported a downed tree along Paoli Pike just south of Buffalo Trail.

Flood in DUBOIS, INDIANA
From 21-DEC-13 20:47:00 to 21-DEC-13 20:47:00 (EST-5)
Location: MALTERSVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The local emergency manager reported a few county roads under water. One car became stalled in high water on Greener Road.

Flood in PERRY, INDIANA
From 21-DEC-13 22:27:00 to 21-DEC-13 22:27:00 (EST-5)
Location: TELL CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Water from Windy Creek covered the road at 16th and Pestalozzi Streets. Several other roads were also flooded.