Issued Zones: The Inland Empire … Orange County … San Diego Valleys … Los Angeles County Metro from Coast/Valley/Basin … Eastern Ventura Valleys Thousand Oaks … Santa Barbara County Inland … San Luis Obispo Metro to Inland Valleys … Catalina Island …
Site: Southern California Weather Force has issued a Heat Advisory effective now through Thursday night.
Date: 10/21/19 at 5:05pm PT
Forecast: As stated in the previous forecast article, a 595DM Ridge Of High Pressure, very abnormal for this time of year, will move its axis overhead between Tuesday and Thursday of this week. On Tuesday, temperatures will bump up 7 degrees from where they were today and remain hot through Thursday with weak offshore flow.
The SCWF Fire Weather Warning issued last week still remains in effect this week as it stated it would be a prolonged alert. The hottest areas will be Fullerton to Long Beach and to Whittier. These zones will challenge 100F during this event … If sensitive to this heat, take your precautions and please do not walk dogs or cats on the asphalt as it will burn their feet.
The heat advisory will expire on Thursday night after sunset, but Friday will have similar temperatures to today and a gradual cooling over the weekend is expected with no one above 80F by Monday.
An upper level low will miss us to the northeast at the end of the month around Halloween. Some models have a cutoff that will bring us storms, however using my own algorithms I find that to be a 10 to 20% chance of happening and thus 80% chance we will see just on onshore flow, cooler weather, and a chance of upslope showers from the deeper marine layer. But… it will be a cooler period.
If on the trails with recreational activities, bring lots of water along. This heat is dangerous for this time of year for those that think October means cold weather in Southern California.
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10 mile rule: These alerts issued on this site means that within your zone and 10 miles from you will see the event forecast for. You may or may not see the event but it means you are in the zone or 10 miles from where someone will.