The National Weather Service San Diego reported that temperatures will soar 8 to 15 degrees above average on Monday and 15 to 20 degrees above average by Wednesday, raising concerns for sensitive populations dealing with the heat inland. Additionally, weak Santa Ana winds are expected sometimes to trigger elevated fire weather conditions, as per the NWS San Diego.
Despite the pleasant scenario of patchy fog and high clouds, the City anticipates sizzling high 80s by mid-week, a stark contrast to the mild 74-degree afternoons expected earlier this week, per the National Weather Service. The forecast discussion from the NWS San Diego's Area Forecast Discussion notes, "high pressure remains in control of our weather pattern over the next few days with warm weather in the forecast." Amidst this heat, "a trough will move closer to our region off the coast by Wednesday," which, along with another trough, will stir up northerly winds and introduce more pronounced Santa Ana winds by Thursday.
These conditions don't come without their risks. The local SCP (Skywarn Severe Weather Spotter) program has not been activated, but spotters are still encouraged to report significant weather conditions. Regarding marine activity, the likelihood of patchy dense fog extends from the nighttime into the early morning hours through Wednesday, especially affecting the inner coastal waters tonight into Tuesday morning.
The change in weather is due, in part, to a looming trough set to sweep in by Friday, leading to "significant cooling," as described by the NWS San Diego. By the weekend, a cooler, breezier pattern will take hold, bringing a slight chance for light precipitation and dropping temperatures by 10-15 degrees. Amidst this shift, the marine layer remains thin, so nighttime and early morning fog could briefly obscure the coastal regions before a week that climbs into the 90s in some inland valleys and sets the stage for fire weather conditions.
As Thursday rolls in, San Diego County residents can expect "the last very warm day west of the mountains for the foreseeable future," signaled by the temperature dip heading into the weekend. The weekend outlook comprises mostly sunny days with a high in the mid-60s and a chance of showers by Sunday, according to the National Weather Service. With the juxtaposition of a warm front followed by cooler conditions and potential showers, San Diegans will do well to enjoy the heat while it lasts and prepare for a precipitation-laden close to the week.
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