Calm to light winds combined with lots of surface moisture from last night's rainfall have allowed for a fairly thick fog to envelop the Red River Valley this morning. Here's a visible satellite image from this morning at 8:45 am showing the fog areas in parts of southern Manitoba.
Winnipeg airport reported visibility as low as 200 metres. You couldn't see anything in the Winnipeg webcams this morning:
The fog will slowly ''burn off'' through the morning as the sun manages to warm the surface, allowing relative humidity to drop. When this occurs, the water droplets in the fog evaporate. Often times the fog dissipates at the surface first, leaving a layer of stratus just above the ground that will also dissipate shortly after. Fog is usually thinner at the edges (seen on satellite), therefore this is where it usually dissipates first.