@~7:57pm-~8:12pm (PDT): Developed cumulonimbus (thunderstorm) clouds spotted ~75 miles east of Lancaster. One group was in the mid stages of development and had lenticular (lens shaped clouds)/pileus (cap) clouds capping the cell; and the other group was in the advanced stages of development forming an anvil. Because our forecast indicates increased convection, I suspect we will very likely be seeing some good thunderstorms in the near future! The atmospheric conditions to the far east are extremely unstable and the air mass is moving our way so we'll be seeing more action tomorrow! We have a chance of thunderstorms tomorrow (Saturday) through Monday.