Tropical Storm Arthur was forecast by the NHC to continue moving northeastward towards the outer banks of North Carolina while a mid-upper level low over TX moves eastward. This allowed for the wind flow over South FL to be SSW which allowed the Gulf Sea Breeze to form along with the Atlantic Sea Breeze. Plenty of residual tropical moisture across the area, along with the eventual sea breeze collision, lead to scattered to numerous strong showers and thunderstorms that eventually pushed eastward towards the east coast metro areas (thanks to the SSW flow). Heavy rain and flooding along with strong wind gusts and small hail were reported. Enhanced helicity/shear in Palm Beach County even led to the development of a funnel cloud.

Thunderstorm Wind in BROWARD, FLORIDA
From 17-MAY-20 16:05:00 to 17-MAY-20 16:05:00 (EST-5)
Location: CORAL SPGS
Magnitude: 35.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: NWS Employee

An off-duty NWS Employee reported scattered small to medium sized downed tree branches in Parkland, near the Parkland Farmers Market and along the intersection of Parkside Dr and Holmberg Rd. Wind gust estimated based off radar at approximately 40 mph (35 kt), but were likely higher on the ground.

Funnel Cloud in PALM BEACH, FLORIDA
From 17-MAY-20 17:38:00 to 17-MAY-20 17:43:00 (EST-5)
Location: WELLINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a funnel cloud to the SW of the intersection of Big Blue Trace and Wellington Trace from a thunderstorm moving through the area.

Thunderstorm Wind in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:25:00 to 17-MAY-20 15:25:00 (EST-5)
Location: COCONUT GROVE
Magnitude: 36.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: NWS Employee

An off-duty NWS Employee reported multiple medium and large sized tree branches down near Percival Ave and Oak Ave. Wind gust estimated based off radar at approximately 42 mph (36 kt), but were likely higher on the ground. Small hail (approximately 0.50 inches, estimated) was also reported with this thunderstorm.

Thunderstorm Wind in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:15:00 to 17-MAY-20 15:15:00 (EST-5)
Location: RICHMOND HGTS
Magnitude: 36.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: NWS Employee

An off-duty NWS Employee reported multiple large sized tree branches down near the intersection of SW 104th St (Killian Drive) and SW 115th Ave. Wind gust estimated based off radar at approximately 42 mph (36 kt), but were likely higher on the ground. Small hail (approximately 0.50 inches, estimated) was also reported with this thunderstorm.

Thunderstorm Wind in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:15:00 to 17-MAY-20 15:15:00 (EST-5)
Location: KENDALL
Magnitude: 36.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: Social Media

The public reported multiple softwood trees down in their backyard in the Glenvar Heights/South Miami area via social media. Wind gust estimated based off radar at approximately 42 mph (36 kt), but were likely higher on the ground. Small hail (approximately 0.50 inches, estimated) was also reported with this thunderstorm.

Thunderstorm Wind in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:00:00 to 17-MAY-20 15:00:00 (EST-5)
Location: COCONUT GROVE
Magnitude: 36.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Social Media

The public reported a large tree downed onto their roof and fence via social media. Wind gust estimated based off radar at approximately 42 mph (36 kt). Small hail (approximately 0.50 inches, estimated) was also reported with this thunderstorm.

Flood in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:00:00 to 17-MAY-20 18:00:00 (EST-5)
Location: SOUTH MIAMI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS Employee reported roadways with several inches of water, some roadways impassable, in Coconut Grove and along Percival Ave and Oak Ave from a thunderstorm and heavy rain that passed through the area.

Thunderstorm Wind in MIAMI-DADE, FLORIDA
From 17-MAY-20 15:30:00 to 17-MAY-20 15:30:00 (EST-5)
Location: SOUTH MIAMI
Magnitude: 36.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: NWS Employee

An off-duty NWS Employee reported multiple medium and large sized tree branches down near Hammock Oaks and Old Cutler Rd. Wind gust estimated based off radar at approximately 42 mph (36 kt), but were likely higher on the ground. Small hail (approximately 0.50 inches, estimated) was also reported with this thunderstorm.