Tropical Storm Isaias brought high winds, heavy rain, several tornadoes, and coastal flooding to the mid-Atlantic region, becoming the most impactful tropical cyclone to impact most of the region since Sandy in 2012.

Flash Flood in NEW CASTLE, DELAWARE
From 04-AUG-20 09:25:00 to 04-AUG-20 11:30:00 (EST-5)
Location: WILMINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

East 12th Street was closed at Interstate 495 in Wilmington due to flooding.

Tornado in SUSSEX, DELAWARE
From 04-AUG-20 07:25:00 to 04-AUG-20 07:28:00 (EST-5)
Location: CHESTNUT KNOLL
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado touched down north of the intersection of Shawnee Rd and Old Shawnee Rd in southwest Milford (Sussex County) around 8:25 AM on August
4. Tree damage was found in this area. The tornado initially moved north-northeast as it tracked towards the Kent County line. There was extensive tree damage from Meadow Brook and
Evergreen lanes north to Haven Lake, which divides the two counties. Numerous trees were uprooted or snapped. The tornado remained on the ground as it crossed the lake into Kent County.

Tropical Storm in DELAWARE BEACHES, DELAWARE
From 04-AUG-20 07:15:00 to 04-AUG-20 15:00:00 (EST-5)
Crop damage: 0.00K
Reported by: Mesonet

Sustained winds of 40 to 50 mph with higher gusts were measured along the Delaware seashore.

Tropical Storm in KENT, DELAWARE
From 04-AUG-20 07:15:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: Mesonet

A couple measurements were made of low end sustained tropical storm force winds with higher gusts. A few downed trees and wires were reported in addition to locally enhanced tornado damage.

Tropical Storm in NEW CASTLE, DELAWARE
From 04-AUG-20 08:00:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: ASOS

A sustained wind of 43 mph with gusts to 59 mph was measured at New Castle County Airport (KILG). Downed trees and power lines were reported in the county, along with locally more significant damage caused by a tornado. A wind gust of 96 mph was measured near Smyrna in association with a tornado.

Tornado in KENT, DELAWARE
From 04-AUG-20 07:28:00 to 04-AUG-20 07:30:00 (EST-5)
Location: MILFORD
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Soon after crossing Haven Lake into Kent County, the tornado's direction of motion shifted considerably, from north-northeast to northwest. The tornado crossed
Williamsville Road producing additional tree damage, then lifted
as it proceeded northwest west of Milford Harrington Highway. Due to the extensive
tree damage, power lines and some poles were also down along
portions of the tornados path. Several of the trees were of
softwood and snapped at their trunks, which is indicative of 100
mph winds and this was used to rate this tornado. This wind speed
corresponds to an EF1 on the Enhanced Fujita Scale. Doppler radar
data showed a well defined tornado debris signature that quickly
developed on the west and northwest side of Milford as the
circulation moved through.

Tornado in NEW CASTLE, DELAWARE
From 04-AUG-20 08:10:00 to 04-AUG-20 08:30:00 (EST-5)
Location: WALKER
Tornado F-scale: EF2
Reported by: NWS Storm Survey

As this tornado crossed into New Castle County, it continued nearly parallel to Routes 1
and 13 on the east sides of Townsend and Middletown. Numerous trees were snapped or uprooted along portions of
Blackbird Landing Road and Gum Bush Road in Townsend with some
damage to roofs. A garage at a residence on Blackbird Landing Road
was destroyed. The tornado then damaged homes in Middletown along
Spring Hollow Drive. In this neighborhood, some homes had roof
material and siding blown off with numerous trees uprooted.
Several garage doors were blown out and one home had an entire
side wall blown off. One picture showed a home with a missing
exterior corner walls on the second story.
The tornado continued north northwest to the Summit Bridge area
just south of the C and D canal. It is here where substantial
damage occurred to several homes, including one home that had more
than half of its roof completely torn off with a neighboring home
losing several sections of their roof. Some other homes lost a
portion of their roof and siding was torn off with a garage door
blown in, along with several trees down or snapped. The tornado
crossed the canal and tracked near Lums Pond and through an
adjacent wooded area where pictures and areal footage showed a
clear path with numerous trees down. The tornado then crossed
Route 896 and into the Brennan Estates where hundreds of trees
were down or uprooted and around a dozen homes sustained enough
damage that they were declared as uninhabitable. The tornado then
looked to have lifted prior to crossing over into Cecil County
Maryland.
Based on the damage to the homes in the Middletown to Summit
Bridge to Brennan Estates areas especially (some non-tree related
damage), the rating of this tornado was increased to 115 mph which
is equivalent to an EF2 on the Enhanced Fujita Scale. Doppler
radar data showed a continuous and well defined rotational
signature and also a tornado debris signature.
This tornado path length set a new record in Delaware, greatly
surpassing the previous tornado path length record of 13 miles
which occurred in 1988.

Tornado in KENT, DELAWARE
From 04-AUG-20 07:25:00 to 04-AUG-20 07:28:00 (EST-5)
Location: SANDTOWN
Tornado F-scale: EF1
Reported by: NWS Storm Survey

The tornado touched down in the vicinity of Road 258 south of
Sandtown Road, then tracked across a section of mostly open fields
but damaged some trees along the way. It then tracked down the
western portion of Sandtown Road closer to Route 10 damaging
several homes and snapping and uprooting several trees. A home had
some windows blown out along with roof damage, another home had
its roof blown off and there was a large garage that had its back
sheet metal wall torn off. The tornado crossed Route 10 near the
intersection with Sandtown Road and moved across the Sandtown
Landfill facility where additional trees were uprooted or snapped,
two front-end loaders had windows blown out and some truck
trailers were flipped over. The tornado exited the landfill and
may have dissipated before reaching the Maryland-Delaware state
line. Doppler radar data showed rotation and a notable tornado
debris signature near and just northwest of Sandtown as debris was
tossed into the air.

Tornado in KENT, DELAWARE
From 04-AUG-20 07:55:00 to 04-AUG-20 08:10:00 (EST-5)
Location: LEBANON
Tornado F-scale: EF2
Reported by: NWS Storm Survey

The tornado touched down in the vicinity of the Eagle Meadows
Apartment Homes on Sorghum Mill Road in Kent County then moved
across Route 10. It tracked nearly parallel to South State Street
through Anneville, the south side of Dover, where significant tree
damage occurred, including some treetops shredded from Poplar
Lane to the neighborhood around Steele Road. It was here where
some roof damage occurred to some homes especially due to fallen
trees, however a garage was significantly damaged on Dyer���s Tree
Farm. The tornado then crossed over Route 13 near the Eden
Medical Center and very near the William Henry Middle School. A
couple sections of the school���s roof were blown off along with
some tree damage nearby. A warehouse adjacent to the school had a
few sections of its metal walls torn off and a couple of tractor
trailer trailers flipped onto their side. The tornado then crossed
over Walker Road at Route 15 then to Westminster Village at Dover
near the intersection of Route 15 and College Road.
The tornado continued northward just east of Cheswold where it may have briefly lifted for a time with discontinuous tree damage
before moving through the east side of Smyrna where more notable
tree damage occurred. A 96 mph wind gust was measured at a
Delaware Department of Transportation weather station located on
Route 1 just north of Smyrna as the tornadic circulation passed
by. The tornado continued north-northwestward as it crossed Duck Creek into New Castle County.

Tropical Storm in INLAND SUSSEX, DELAWARE
From 04-AUG-20 07:15:00 to 04-AUG-20 15:00:00 (EST-5)
Reported by: ASOS

Several instances of sustained tropical storm force winds occurred including at Delaware Coastal Airport (KGED). Multiple reports of downed trees and wires were received in addition to localized tornado damage.

Flash Flood in NEW CASTLE, DELAWARE
From 04-AUG-20 09:55:00 to 04-AUG-20 12:00:00 (EST-5)
Location: HARMONY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Moderate flooding occurred along the White Clay Creek, downstream from Newark.

Flash Flood in NEW CASTLE, DELAWARE
From 04-AUG-20 08:40:00 to 04-AUG-20 12:00:00 (EST-5)
Location: COOCH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Major flooding occurred along the Christina River downstream from the Newark area.

Flash Flood in NEW CASTLE, DELAWARE
From 04-AUG-20 10:55:00 to 04-AUG-20 12:30:00 (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 in the Wooddale area.