A dense fog advisory is now in effect for Long Island and Southern Connecticut with widespread visibilities one quarter mile or less.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. In Connecticut, Southern Fairfield, Southern Middlesex, Southern New Haven, and Southern New London Counties. In New York, Northeast Suffolk, Northern Nassau, Northwest Suffolk, Southeast Suffolk, Southern Nassau, and Southwest Suffolk Counties. * WHEN. Until 9 AM EDT Monday. * IMPACTS. Low visibility could make driving conditions hazardous.

Fog will continue to develop tonight reducing visibilities to less than a mile through early Sunday morning. Patchy dense fog is also expected with visibilities less than a quarter mile at times. Travelers should be prepared for quickly changing visibilities. Slow down and use your low beams in the fog.

Widespread fog will reduce visibilities to less than a mile through early Sunday morning. Patchy dense fog is also expected with visibilities less than a quarter mile at times. Travelers should be prepared for quickly changing visibilities. Slow down and use your low beams in the fog.

* WHAT. Dense fog will reduce visibility to 1 NM or less. * WHERE. Long Island Sound, and Peconic and Gardiners Bays. * WHEN. Until 10 AM EDT Monday. * IMPACTS. Low visibility will make navigation difficult.