Issued Zones:  The Inland Empire …

Site:  Southern California Weather Force has issued a Frost Advisory effective now for tonight into Friday morning …

Date:  12/26/19 at 1:55pm PT

Forecast: Dry air behind the departing system with a weak offshore flow will bring temperatures to frost criteria early Friday morning.  SCWF Frost Forecast Model shows the regions of expectance. 

There is a miss for the Norco/Mira Loma areas and this is likely due to a bit more of sinking air in the in the offshore flow.  Other areas surrounding it from Rancho, San Bernardino, and the Perris/Temecula/Hemet/Banning areas will have the frost criteria with wind sheltered zones. 

Zones affected will be along I-15 as far south as Fallbrook and Escondido.  If you have plants, do what you do during a frost advisory to protect them.

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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.

Forecaster: KM