In the wake of a cold front and a cold upper trough overhead, strong northwest winds were observed across the Greater Bay Area in mid to late May. Observations showed gusts along the coast exceeding 50 mph with area peaks reaching 60 plus mph.

Strong Wind in SAN FRANCISCO, CALIFORNIA
From 19-MAY-21 17:08:00 to 19-MAY-21 17:13:00 (PST-8)
Magnitude: 45.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

San Francisco CWOP station measured gusts of 52 mph.

Strong Wind in SAN FRANCISCO, CALIFORNIA
From 19-MAY-21 14:28:00 to 19-MAY-21 18:28:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

San Francisco CWOP station measured wind gusts between 45 and 50 mph.

Strong Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 19-MAY-21 11:20:00 to 19-MAY-21 21:00:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet (PG&E) station on Snake Rd measured wind gusts between 45 and 55 mph with a peak gust of 57 mph.

Strong Wind in NORTH BAY INTERIOR VALLEYS, CALIFORNIA
From 19-MAY-21 14:10:00 to 19-MAY-21 16:10:00 (PST-8)
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet (PG&E) station on Spolini Mountain.

Strong Wind in NORTH BAY MOUNTAINS, CALIFORNIA
From 19-MAY-21 14:33:00 to 19-MAY-21 20:33:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Big Rock RAWS measured gusts around 50 mph with a peak gust of 57 mph.

Strong Wind in SAN FRANCISCO BAY SHORELINE, CALIFORNIA
From 19-MAY-21 11:00:00 to 19-MAY-21 22:56:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

San Francisco Airport ASOS reported wind gusts between 45 and 50 mph with a peak gust of 56 mph.

Strong Wind in SAN FRANCISCO PENINSULA COAST, CALIFORNIA
From 19-MAY-21 12:50:00 to 20-MAY-21 00:30:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet (PG&E) station at BFI Office reported wind gusts between 45 and 55 mph with a peak gust of 63 mph.

Strong Wind in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 19-MAY-21 15:10:00 to 20-MAY-21 00:50:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) at Patterson Pass reported wind gusts between 45 and 55 mph with a peak gust of 61 mph.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 20-MAY-21 14:10:00 to 20-MAY-21 15:30:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) at Coast Road measured wind gusts around 45 mph with a peak gust of 49 mph.

Strong Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 20-MAY-21 11:30:00 to 20-MAY-21 17:40:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) on Snake Road measured wind gusts between 45 and 50 mph with a peak gust of 52 mph.

Strong Wind in SAN FRANCISCO, CALIFORNIA
From 19-MAY-21 22:00:00 to 19-MAY-21 22:30:00 (PST-8)
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Strong winds in San Francisco caused a tree to snap and fall on to electrical wires blocking an intersection in Bernal Heights. Another large tree fell in Daly City as well where a car was struck at Serramonte and Callan with one minor injury https://www.nbcbayarea.com/news/local/strong-wind-gusts-topple-trees-cause-damage-along-sf-peninsula/2549950/.