Full Notification

A Red Flag Warning has been issued for the North Bay Mountains, East Bay Hills, and East Bay Interior Valleys, valid beginning 10 PM PDT on Wednesday October 21st through 08 AM Friday October 23rd. Winds will continue to be north-northeasterly and are forecast to increase over the highest peaks and ridges to 10 to 25 mph, with gusts generally up to 40 mph. When the Fire Weather Watch was upgraded to this warning, it was decided to include all of East Bay Valley, although the strongest wind gusts are expected to be the hills. The San Mateo Coast has also been added, as winds from the mountains are expected to accelerate as they mix down to the coast, especially from Half Moon Bay southward. These offshore winds will provide critical fire conditions with dry humidity values through the event, and even drier conditions overnight Thursday and into Friday with poorer humidity recovery expected due to marine layer influence being overrun by said winds.