* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Anchorage, Central Susitna Valley, Lower Matanuska Valley, and Southern Susitna Valley.
* WHEN...Until 9 AM AKST this morning.
* IMPACTS...Hazardous driving conditions due to low visibility.
* ADDITIONAL DETAILS...Areas of locally dense fog have developed around Knik Arm and along parts of the Glenn and Parks Highway overnight. Areas of dense fog are expected to linger across the Anchorage Bowl and Mat-Su Valleys through mid morning.