A low pressure system moving across the tropical Atlantic into the eastern Caribbean Sea formed into Tropical Storm Isaias on July 28th. While the system briefly became a hurricane near Great Inagua Island on July 30th, it was downgraded back to a Tropical Storm as it moved over Andros Island on August 1st with a minimum central pressure of 993 mb. Isaias gradually turned to the N-NW and the center passed about 30-40 miles east of the Palm Beach County coast during the morning of August 2nd with a minimum central pressure of 995 mb and maximum sustained winds of 65 to 70 mph. Lowest surface pressure measured along the coast of South Florida was 1003.1 mb at Lake Worth Pier on August 2nd. At Settlement Point/West End, Grand Bahama Island, lowest measured surface pressure was 1000.5 mb on August 2nd.
Although the effects from Tropical Storm Isaias were fairly minor for South Florida, there were sustained Tropical Storm force winds over the Atlantic waters and Biscayne Bay which created hazardous marine conditions.

Marine Tropical Storm in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 01-AUG-20 01:00:00 to 02-AUG-20 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Sustained tropical storm force winds around 35 knots were recorded in the nearshore Atlantic waters of Palm Beach County, with speeds likely as high as 40-50 knots offshore based on data from hurricane hunter aircraft. A peak wind gust of 52 mph (45 kt) was recorded at the coast by the NOAA/NDBC C-MAN station at Lake Worth Pier at 3:12 PM EDT on August 1st.

Marine Tropical Storm in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 01-AUG-20 01:00:00 to 02-AUG-20 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Sustained tropical storm force winds around 35 knots were recorded in the nearshore Atlantic waters of Miami-Dade and Broward counties, with speeds likely as high as 40-50 knots offshore based on data from hurricane hunter aircraft. A peak wind gust of 58 mph (50 kt) was recorded at the coast by a Wxflow mesonet station XDAN, Dania Pier in association with a strong outer rain band emanating from Isaias at 2:22 PM EDT on August 1st.

Marine Tropical Depression in BISCAYNE BAY, ATLANTIC SOUTH
From 01-AUG-20 01:00:00 to 02-AUG-20 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Maximum sustained winds on Biscayne Bay were in the 30 to 35 mph range, with peak gusts of 40-45 mph. The highest measured value was 46 mph (40 kt) wind gust recorded by Wxflow mesonet station XKBS, Biscayne Bay Light 20 southwest of Key Biscayne in association with a strong outer rain band emanating from Isaias at 1:58 PM EDT on August 1st.

Marine Tropical Storm in DEERFIELD BEACH TO OCEAN REEF FL 20 TO 60NM, ATLANTIC SOUTH
From 01-AUG-20 01:00:00 to 02-AUG-20 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Sustained tropical storm force winds over the offshore waters were probably in the 40-50 knot range based on data from hurricane hunter aircraft, with gusts possibly as high as 60 knots.

Marine Tropical Storm in JUPITER INLET TO DEERFIELD BEACH FL 20 TO 60NM, ATLANTIC SOUTH
From 01-AUG-20 01:00:00 to 02-AUG-20 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Sustained tropical storm force winds over the offshore waters were probably in the 45-55 knot range based on data from hurricane hunter aircraft, with gusts possibly as high as 60 knots.
East of the center of Isaias, the NOAA/NDBC C-MAN station at Settlement Point/West End, Grand Bahama Island recorded a maximum sustained wind of 44 knots at 1030 AM EDT on August 2nd, and a peak wind gust of 56 knots at 9:51 AM EDT.