An impulse riding along a west to east boundary stalled near the Mason-Dixon line produced severe thunderstorms and heavy rain across sections of northern Delaware from late afternoon through the evening hours on August 7th. Strong winds knocked down trees, and torrential downpours on ground already saturated from the remnants of Hurricane Isaias produced flash flooding on many roadways and small streams in the area.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:50:00 to 07-AUG-20 16:50:00 (EST-5)
Location: GREENVILLE
Magnitude: 50.00 EG
Reported by: Public

Trees down in Greenville.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:50:00 to 07-AUG-20 16:50:00 (EST-5)
Location: MT CUBA
Magnitude: 50.00 EG
Reported by: Public

Several trees down along Centerville Road in western Greenville. Time estimated from radar and nearby reports.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:50:00 to 07-AUG-20 16:50:00 (EST-5)
Location: WINTERTHUR
Magnitude: 50.00 EG
Reported by: Public

Trees and wires down along Montchanin Road north of Wilmington.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:52:00 to 07-AUG-20 16:52:00 (EST-5)
Location: GREENVILLE
Magnitude: 50.00 EG
Reported by: Public

Trees and power poles down n Greenville. Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:55:00 to 07-AUG-20 16:55:00 (EST-5)
Location: WILMINGTON
Magnitude: 50.00 EG
Reported by: Broadcast Media

Trees down or snapped on North Madison Street between West 9th and West 10th streets in Wilmington.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:55:00 to 07-AUG-20 16:55:00 (EST-5)
Location: LANCASTER VLG
Magnitude: 50.00 EG
Reported by: Public

Trees down in Wilmington.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:55:00 to 07-AUG-20 16:55:00 (EST-5)
Location: EDGEMOOR
Magnitude: 50.00 EG
Reported by: Amateur Radio

Tree down onto power lines at Wilmington Washington Street Extension and Hanover Road in north Wilmington.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:55:00 to 07-AUG-20 16:55:00 (EST-5)
Location: KENTMERE
Magnitude: 50.00 EG
Reported by: Broadcast Media

Large tree uprooted and blocking School Road in Alapocas.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:57:00 to 07-AUG-20 16:57:00 (EST-5)
Location: EDGE MOOR
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

Tree onto a house with people trapped in Edgemoor Gardens.  Power lines down.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 17:09:00 to 07-AUG-20 17:09:00 (EST-5)
Location: CENTERVILLE
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees and wires down at Kennett Pike and Old Kennett Road.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 17:10:00 to 07-AUG-20 19:00:00 (EST-5)
Location: WINTERTHUR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A section of Thompsons Bridge Road near Montchanin Road in Winterthur was washed away by flood waters.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 17:20:00 to 07-AUG-20 19:00:00 (EST-5)
Location: HARNOUS CORNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Sections of three roads in the Naaman Manor and Talleys Corner area were washed away by flood waters.  The list includes Birch Knoll Road near Broadbent Road, Graylyn Road, and Delwynn Drive near Ruthwynn Drive.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 17:15:00 to 07-AUG-20 19:00:00 (EST-5)
Location: STANTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A section of DE Route 4 westbound in the Stanton area was washed away by flood waters.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 16:45:00 to 07-AUG-20 18:30:00 (EST-5)
Location: HOCKESSIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Significant flooding occurred along Lancaster Pike in Hockessin with at least one vehicle trapped in the flood waters.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 17:05:00 to 07-AUG-20 19:00:00 (EST-5)
Location: YORKLYN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A home in Yorklyn was taking on water.  A section of Yorklyn Road was washed away by flood waters.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 17:30:00 to 07-AUG-20 19:30:00 (EST-5)
Location: CARPENTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Interstate 95 was closed due to flooding at the Pennsylvania state line near Claymont.  A section of Manor Avenue in Claymont was washed away by flood waters.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 18:10:00 to 07-AUG-20 20:30:00 (EST-5)
Location: BRANDYWINE SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Red Clay Creek near Wooddale.

Flash Flood in NEW CASTLE, DELAWARE
From 07-AUG-20 20:10:00 to 07-AUG-20 20:45:00 (EST-5)
Location: STANTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Moderate flooding occurred along the Red Clay Creek in the Stanton area.

Tornado in NEW CASTLE, DELAWARE
From 07-AUG-20 16:40:00 to 07-AUG-20 16:51:00 (EST-5)
Location: ASHLAND
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado touched down around 5:40 PM on August 7th close to the
Ashland Nature Center of the Delaware Nature Society or just east
of the intersection of Brackenville Road and Barley Mill Road
where some tree damage occurred. The tornado continued east
southeast to the Swallow Hill area where there were multiple trees
down across Pyles Ford Road. Trees were snapped at the trunk,
with one tree falling on the roof of a house. Pyles Ford Road was
closed due to the amount of tree damage across the road. This wind
damage was estimated to be 105 mph, equivalent to an EF1 on the
Enhanced Fujita Scale.
The tornado continued in an easterly direction where substantial
tree damage occurred just north of Valley Garden Park where over
20 trees were uprooted or damaged. Campbell Road was also closed
due to the multiple trees down. More damage occurred along Kennett
Pike between Kirk Road and the entrance of Wilmington Country
Club where several trees were uprooted along with large tree limbs
knocked down. The tornado continued through the Wilmington
Country Club where approximately 200 trees were damaged. A noted
convergent pattern in the debris was observed in the tree damage
across the Wilmington Country Club. The tornado then continued
eastward before lifting prior to reaching Rockland, Delaware. No
further damage was noted in the DuPont Country Club or on Concord
Pike.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:38:00 to 07-AUG-20 16:38:00 (EST-5)
Location: HOCKESSIN
Magnitude: 58.00 EG
Reported by: Broadcast Media

Trees down in Hockessin.  Time estimated from radar.

Thunderstorm Wind in NEW CASTLE, DELAWARE
From 07-AUG-20 16:50:00 to 07-AUG-20 16:50:00 (EST-5)
Location: HAGLEY
Magnitude: 50.00 EG
Reported by: Trained Spotter

Numerous trees down or snapped with some onto homes near Hagley.  Time estimated from radar.