The Weathermen's Brains, Dr. M P Renfrew's cartoonIn today’s Area Forecast Discussion,* the National Weather Service Oxnard said, “WE HAVE HAD ALMOST A WEEK OF SOLID OFFSHORE FLOW WITH HUMIDITIES LESS THAN 20%”:
Sunday 1/20/13 2 p.m. (Look at arrows along coastline, the daily afternoon High-pressure pattern):
Sunday 1-20-13 2 p.m.  Offshore winds blowing West at the shore (called 'offshore flow') mapThanks to weatherflow for making these maps,