Dense, 450-mile-long fog bank lingering over central valley as experts blames unusual combination of weather factorsNew Nasa satellite images reveal the scope of central California’s dreary December, caused by an enormous fog formation that has been haunting the Central Valley for weeks, trapping residents in colder-than-usual temperatures.The low cloud formation, known as tule fog, first formed over central California in November and persisted into early December. The Central Valley typically sees this type of fog during the colder months of the year, when the air near the ground is cold and moist, and the winds are calmer, allowing moisture in the air to transform into a thick layer of fog. Continue reading... ...read more read less