Two weather disturbances together are going to bring increasing moisture to the region through Thursday. In addition, the atmosphere will gradually increase in instability, meaning by Wednesday, conditions will be favorable for widespread thunderstorm development. A Red Flag Warning (for dry lightning) remains in effect for Northern California and a Fire Weather Watch for the Klamath Basin.
Expect increasing clouds Tuesday for all locations with the greatest chance for showers and thunderstorms being over Siskiyou County and the Klamath Basin. By Wednesday though, this threat expands further West into the valleys. It’s quite possible though, that nocturnal thunderstorms will be possible Tuesday night for the Cascades and West Side.
Storms are going to be slow movers, and rain producers by Wednesday as well. This will pose flash flooding threats for those that do see thundershower activity. With the very dry air near the surface, strong winds are likely to occur. Cooler air aloft will support hail, and as always cloud to ground lightning will certainly be something for close monitoring.
Meteorologist Alyssa Caroprese