Third storm in series drops 4 to 6 inches of snow on San Juan County Mike Easterling, Farmington Daily Times FARMINGTON — The last storm in a series of three disturbances that moved through the Four Corners area over the past several days packed the biggest wallop, dumping 4 to 6 inches of snow in locations across San Juan County overnight. Most residents of the county headed to bed on Feb. 15 having seen only a dusting or an inch or so of snow from the first two storm systems, which began on Feb. 12. But by the time they woke up on Feb. 16, things had changed considerably.