Hear that thunder?
The National Weather Service issued a significant weather advisory Monday afternoon as a thunderstorm appeared 7 miles east of Mission Viejo.
The storm is moving southwest at 5 MPH, says the NWS.
Affected areas include Mission Viejo, Lake Forest, Rancho Santa Margarita, Laguna Hills, Trabuco Highlands, Portola Hills and Coto de Caza.
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Winds of up to 50 MPH are expected, according to the NWS.
Lake Forest residents reported hearing thunder in town shortly after 3 p.m.