Another round of Santa Ana winds has moved into Southern California and will spread south through San Diego County late Thursday. The additional dry air also is expected to worsen the region’s already very low humidity levels,

That’s leading to the creation of mountain waves, which arise when strong winds blow perpendicular to a mountain range. The waves shoot down the coastal side of the mountains, gaining speed along the way, and are more casually referred to as simple Santa Ana winds.

A "Particularly Dangerous Situation" (PDS) red flag fire warning is in effect in Southern California. A red flag warning means that critical fire weather conditions are either occurring now, or will shortly.

The National Weather Service has issued a Red Flag waning for a wide swath of Southern California as Santa Ana winds are expected to bring dangerous fire weather to the region later this week.

Although the strongest wind gusts have passed through the Southern California region, another "traditional Santa Ana wind event" will move in Thursday night.

The National Weather Service on Wednesday extended the wildfire warning through the end of the week for much of East County.

A short reprieve in the strong destructive winds has granted firefighters an opportunity to curb the spread of the deadly Eaton Fire near Pasadena.

Another round of Santa Ana winds is forecast to sweep into SoCal on Thursday night into Friday morning, putting most of the region under a critical fire risk, as emergency responders battle to contain quickly spreading wildfires.