Precipitation varies from drought conditions to 30 inches of rain a year to eight feet of snow pack in the mountains. It is these two bodies of water which influence weather conditions on the peninsula. Also this updated every 15 minutes. Doppler radar Shows whether there is any rain over the Southwest USA and Northern Baja. This is the water vapor image.
Black areas are low humidity, whiter areas are increasingly humid conditions.
This shows the jet stream over the western US and Mexico Pacific Storms Northern Hemisphere IR view of Canada, the USA, Mexico and the Pacific Ocean.