A weak upper level low pressure system brought some mid level clouds to the area during the morning of January 13 inhibiting fog formation in the valley that morning. However, skies cleared out during the early morning of January 14 which allowed for widespread dense fog to form in the San Joaquin Valley as light winds and inversion conditions prevailed.  The fog resulted in several multi-vehicle accidents during the morning of January 14 and California Highway Patrol paced traffic on several highways as visibility was as low as 50 feet on some highways.  In addition, several school districts in the San Joaquin Valley opened late and cancelled bus service for the day. The fog slowly dissipated during the early afternoon.

Dense Fog in MERCED-MADERA-MENDOTA, CALIFORNIA
From 14-JAN-22 00:35:00 to 14-JAN-22 12:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility below a quarter mile was reported in Atwater, Merced and Madera. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service.

Dense Fog in WEST SIDE OF FRESNO AND KINGS COUNTIES, CALIFORNIA
From 14-JAN-22 02:25:00 to 14-JAN-22 12:03:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility below a quarter mile was reported in Lemoore. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service.

Dense Fog in CARUTHERS - SAN JOAQUIN - SELMA, CALIFORNIA
From 14-JAN-22 02:00:00 to 14-JAN-22 12:00:00 (PST-8)
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service. Ten separate multi-vehicle accidents occured along SR 99 between Selma and Fresno. One collision involving a tractor trailer resuted in traffic being stopped on northbound SR 99 at the Manning Ave. exchange northwest of Selma as the driver of the car which collided with the tractor trailer was critically injured. Visibility was reported be below 200 feet at the time by California Highway Patrol.

Dense Fog in FRESNO - CLOVIS, CALIFORNIA
From 14-JAN-22 05:00:00 to 14-JAN-22 11:35:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility below a quarter mile was reported in Fresno. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service.

Dense Fog in DELANO - WASCO - SHAFTER, CALIFORNIA
From 14-JAN-22 04:35:00 to 14-JAN-22 09:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility below a quarter mile was reported in Delano. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service.

Dense Fog in HANFORD - CORCORAN - LEMOORE, CALIFORNIA
From 14-JAN-22 00:20:00 to 14-JAN-22 11:20:00 (PST-8)
Property damage: 100.00K
Crop damage: 0.00K
Reported by: ASOS

Visibility below a quarter mile was reported in Hanford. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service. A ten vehicle accident occured on eastbound SR 198 just east of the SR 99 exchange east of Hanford. Visibility was reported be below 100 feet at the time by California Highway Patrol. This resulted in SR 198 being closed for over two hours.

Dense Fog in VISALIA - PORTERVILLE - REEDLEY, CALIFORNIA
From 14-JAN-22 04:10:00 to 14-JAN-22 12:45:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Visibility below a quarter mile was reported in Visalia. Several webcams showed visibility below 1000 feet. Several school districts either opened late or delayed or cancelled bus service.