Slowly westward moving thunderstorms that formed along a backdoor cold front caused flash flooding in parts of Northampton and Upper Bucks Counties during the evening of the 15th.  Reported event precipitation totals reached 2 to 3 inches. Doppler Radar storm total estimates exceeded 4 inches in south central Northampton County.

Flash Flood in NORTHAMPTON, PENNSYLVANIA
From 15-JUN-15 18:45:00 to 15-JUN-15 21:45:00 (EST-5)
Location: MOORESTOWN
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with torrential downpours caused poor drainage flooding as well as flash flooding of smaller creeks in central and southern Northampton County. The heaviest rain fell in a northwest to southeast axis across the county from eastern East Allen Township through Lower Nazareth Township, Bethlehem Township, Lower Saucon Township and Williams Township. In Bethlehem, flash flooding forced the closure of Easton Avenue at Willow Park Road.  Flash flooding along the Nancy Run also washed out sections of Willow Park Road south through Walnut Street.  A large sink hole near a Pennsylvania Power and Light transmission tower on Clermont Street forced the evacuation of 25 to 30 families for a day. A home on Garrison Street had damage to its foundation and sidewalk. Wilson Avenue, near the Lehigh River became a river itself. Other roadways near the Lehigh River were washed away.  In Easton, parts of Hope Road washed away. Event precipitation totals included 2.89 inches in Glendon and 2.21 inches in Easton.

Flash Flood in NORTHAMPTON, PENNSYLVANIA
From 15-JUN-15 19:37:00 to 15-JUN-15 22:00:00 (EST-5)
Location: BETHLEHEM
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Thunderstorms with torrential downpours caused flash flooding along the Monocacy Creek in Bethlehem. Parts of the Illick's Mill and locations behind the Hotel Bethlehem were flooded. Flood waters also reached into the bottom of the historic Tannery and Waterworks. Other parts of the historic downtown and northern neighborhoods also suffered from poor drainage flooding. The Monocacy Creek at the Illicks Mill Road gage reached its 4.5 foot flood stage at 837 p.m. EDT on the 15th and crested at 5.99 feet at 1045 p.m. EDT on the 15th.

Flash Flood in BUCKS, PENNSYLVANIA
From 15-JUN-15 19:15:00 to 15-JUN-15 21:15:00 (EST-5)
Location: SPRINGTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with torrential downpours caused poor drainage flooding as well as flash flooding of smaller creeks in Durham and Nockamixon Townships.  Doppler Radar storm totals reached 3 to 4 inches near the Northampton County border.

Flood in NORTHAMPTON, PENNSYLVANIA
From 15-JUN-15 22:00:00 to 16-JUN-15 00:07:00 (EST-5)
Location: BETHLEHEM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Residual flooding along the Monocacy Creek in Bethlehem continued into the overnight of the 15th. The Monocacy Creek at the Illicks Mill Road gage was above its 4.5 foot flood stage from 837 p.m. EDT on the 15th through 107 a.m. EDT on the 16th. It crested at 5.99 feet at 1045 p.m. EDT on the 15th.