Before-and-after images from space: Tule fog smothers a huge swath of California
A thick blanket of tule fog has lingered over California’s Central Valley for more than a week. Satellite images reveal the striking difference between clear skies and the dense, low-lying mist now covering the region. Authorities are warning drivers to take extra precautions as visibility drops to dangerous levels.
The fog, known locally as tule fog, forms when cool, moist air settles under clear skies with light winds. It tends to persist in valleys where wind cannot easily disperse it. By Monday evening, November 27, the fog is forecast to reach Level 3 severity, meaning visibility could shrink to just half a mile.
Despite the hazards, this type of radiation fog plays a useful role for local agriculture. Crops like almonds, apricots, cherries, peaches, and pistachios benefit from its chilling effect, which helps meet their winter dormancy needs. The California Highway Patrol has urged motorists to delay travel if possible. Those who must drive are advised to use low beam headlights and keep a safe distance from other vehicles. Past incidents show the risks: tule fog has caused major multi-car pileups on Central Valley highways in previous years.
The fog shows no signs of clearing immediately, leaving roads hazardous for the foreseeable future. With no area in the Central Valley spared from reduced visibility, drivers are being reminded to stay alert. The conditions highlight both the challenges and the unexpected benefits of this seasonal weather phenomenon.
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