As the sun asserts its dominance over the San Diego region, the National Weather Service (NWS) San Diego has alerted much of the inland areas with an Extreme Heat Watch for the latter part of the week. NWS San Diego warns of “areas of high HeatRisk in the deserts with widespread moderate HeatRisk in the mountains and Inland Empire.” Thursday and Friday are expected to be the peak of the heat wave, with temperatures climbing 3 to 7 degrees above average inland. Residents are advised to brace for the upcoming swelter and prepare for limited nighttime relief due to increasing humidity levels accompanying monsoonal moisture.
While the coastal climes remain relatively protected, the inland valleys and deserts are heating up quickly — conditions exacerbated by a westward shift of an upper level high, as detailed in an Area Forecast Discussion by NWS San Diego. This atmospheric rearrangement looks set to displace the long wave trough hugging the coast, further fueling the rise in mercury. The marine layer, a familiar cooling cloak for the coast, is expected to thin and offer little respite for the inlanders. The NWS predicts "highs around 3 to 8 degrees above normal," underlining the unusual warming trend.
Moreover, this overheated escapade comes hand in hand with monsoonal moisture, which is forecasted to return later in the week. This holds potential for showers and thunderstorms, primarily pelting the mountainous terrain and high desert regions on Thursday. A 7 Day Forecast reveals patchy fog's daily dance with sunny intervals, doing little to affect the impending heat assault.
As NWS San Diego puts it succinctly, the area is gearing up for "High pressure will build this week, bringing a warming trend and less marine layer cloud cover." Echoing this sentiment, the marine forecast projects tranquility at sea, with no hazardous conditions expected through Saturday — a stark contrast to the onshore sizzle. All seafaring activities are predicted to carry on undisturbed by Mother Nature's brewing tempestuousness inland.
The Extreme Heat Watch carries a plea for caution, reminding those residing in affected areas such as the San Gorgonio Pass near Banning, the Coachella Valley, and others to remain vigilant. NWS emphasizes that weather spotters should report significant conditions, though "Skywarn activation is not requested."
