* WHAT...Visibility down to 1/4 mile or less.
* WHERE...San Joaquin Valley.
* WHEN...Until 10 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Highways impacted include, but are not limited to, Interstate 5, Highway 99, as well as State Routes 33, 41, 43, 46, 58, 140, 152, 168, 180, and 198.