Fog has covered the Great Valley floor the last few days. Visibility dropped to under 200 yards in the morning.
The orchard rows took on an eerie quality: paths into grey emptiness, lonely corridors, trees there and not there at the same time, spooky pathways. Houses, cars, people, trees ... all appeared and disappeared in the dense fog. The overall effect was ghostly. Morning felt like dusk.
I turn and stare into the foggy mist;
Wondering, wondering, about what I missed.
Above the Fog: Zen and Taoist Poems
"Radiation fogs are frequent in the fall in river valleys and small depressions. The cold air sinks to the bottom of the valley providing the cool air, while rivers and streams provide the water vapor needed to increase the relative humidity via evaporation. These fogs are often called valley fogs. Valley fogs are easily recognized in visible satellite images as they follow the contours of river valleys.
There are a couple of guidelines for forecasting a radiation fog. If the dew point temperature is approximately 5°C below the air temperature at sunset, and if the winds are predicted to be less than 5 knots, there is a good chance that a radiation fog will form during the night."
Fog and Stratus
Photograph of Trees and Valley Fog - Yosemite
Photograph of Fog Over the Great Central Valley
Common Fog Types in California
Sacramento Valley Bio-Region
Agricultural Forecasting Aides for the North Sacramento Valley
California Climate Zones for Growing Temperate Tree Fruits and Nuts
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