Pat's Forecast: Marginal Santa Ana Thursday

SAN DIEGO - Our first October heat wave ramps up Thursday.  Highs will quickly jump nearly ten degrees above Wednesday's comfortable temperatures.

Gusty northeast winds will peak Wednesday night into Thursday morning with a second weaker peak Thursday night into Friday morning.  Gusts could reach 35-45 mph through our mountain passes, canyons and foothills.

A shallower marine layer could cause fog to develop again Thursday morning before it gets very warm.

OK, here are the numbers you'd probably rather not acknowledge... 


  • COAST: 79-93
  • INLAND: 92-97
  • MOUNTAINS: 77-85
  • DESERTS: 93-98

Heat Advisory goes into effect at 11 a.m. Friday for the Mountains and all areas west. The coast will be close to 90° by then, while many inland valley locations will break the 100 degree mark.

Looking for the silver lining, at least this heat wave will not deliver that oppressive humidity we had to endure last go round.  Of course there's a flip side to that...bone dry air.

The lowest humidity levels will be Friday and Saturday elevating the risk of fire danger. The lowest humidity levels will be 5 to 15 percent.

This event is on the weak-to-moderate end of Santa Ana events and the latest forecast tool, the Santa Ana Wildfire Threat Index forecasts Thursday as 'Marginal' which means if a fire ignites it may grow rapidly.

Winds will slowly ease through Saturday.

Have weather photos? Send them to, or join our 10News Weather Watchers Facebook group.

10News Chief Meteorologist Pat Brown

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