Lightning Reported in California's Bay Area Amid Red Flag Warning

The National Weather Service (NWS) issued a red flag warning for parts of northern California on September 9.

In an update, the NWS said forecasted thunderstorms were a result of two weather systems converging over northern California, with a sub tropical flow from the south meeting a system from the Gulf of Alaska.

This convergence could result in high-based thunderstorm as rain evaporates before the hitting the ground leaving “dry thunderstorms” and lightning, the NWS said.

Video posted by Craig Philpott shows a bolt of lightning illuminating the night sky in Napa. Credit: Craig Philpott via Storyful

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