A storm system brought precipitation to central California on January 27, 2015, and was followed by an area of high pressure and stable conditions which led to dense fog development in the San Joaquin Valley each late night and morning on January 28-31. Widespread visibility below 1/4 mile occurred each day, with the visibility dropping below 500 feet in some areas. The dense fog led to airport delays in Fresno, numerous school bus delays each day, and numerous traffic accidents, two of which resulted in fatalities.

Dense Fog in SE S.J. VALLEY, CALIFORNIA
From 30-JAN-15 23:00:00 to 31-JAN-15 10:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Areas visibility less than 1/4 mile.

Dense Fog in SE S.J. VALLEY, CALIFORNIA
From 29-JAN-15 22:15:00 to 30-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in E CENTRAL S.J. VALLEY, CALIFORNIA
From 29-JAN-15 19:00:00 to 30-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile. A vehicle accident occurred at 745 PM PST along Highway 152 at Road 9 in Madera County in dense fog. There was 1 fatality and 1 injury.

Dense Fog in W CENTRAL S.J. VALLEY, CALIFORNIA
From 28-JAN-15 02:30:00 to 28-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Areas visibility 500-700 feet. A multi-vehicle accident involving 2 big rigs, an empty fuel truck and a pickup truck occurred along Highway 41 around 3 AM. There were 2 injuries and 1 fatality.

Dense Fog in SW S.J. VALLEY, CALIFORNIA
From 28-JAN-15 06:35:00 to 28-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility below 1/4 mile.

Dense Fog in SE S.J. VALLEY, CALIFORNIA
From 28-JAN-15 02:35:00 to 28-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility below 1/4 mile in Tulare county.

Dense Fog in W CENTRAL S.J. VALLEY, CALIFORNIA
From 29-JAN-15 06:00:00 to 29-JAN-15 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Areas visibility less than 1/4 mile.

Dense Fog in E CENTRAL S.J. VALLEY, CALIFORNIA
From 28-JAN-15 20:35:00 to 29-JAN-15 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in SW S.J. VALLEY, CALIFORNIA
From 28-JAN-15 22:10:00 to 29-JAN-15 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in SE S.J. VALLEY, CALIFORNIA
From 28-JAN-15 21:55:00 to 29-JAN-15 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in W CENTRAL S.J. VALLEY, CALIFORNIA
From 29-JAN-15 22:30:00 to 30-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in SW S.J. VALLEY, CALIFORNIA
From 29-JAN-15 22:24:00 to 30-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility less than 1/4 mile.

Dense Fog in W CENTRAL S.J. VALLEY, CALIFORNIA
From 31-JAN-15 01:52:00 to 31-JAN-15 08:23:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Areas visibility less than 500 feet.

Dense Fog in E CENTRAL S.J. VALLEY, CALIFORNIA
From 31-JAN-15 07:20:00 to 31-JAN-15 10:53:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Areas visibility less than 500 feet.

Dense Fog in SW S.J. VALLEY, CALIFORNIA
From 30-JAN-15 21:30:00 to 31-JAN-15 10:27:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Areas visibility less than 1/4 mile.

Dense Fog in E CENTRAL S.J. VALLEY, CALIFORNIA
From 28-JAN-15 03:17:00 to 28-JAN-15 11:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread visibility below 1/4 mile. Visibility at Fresno International Airport was reported less than 1/8 mile for several hours resulting in air traffic delays.