San Diego preparing for increased humidity and thunderstorm chances as monsoon season begins.
As the monsoon season begins, San Diego is expected to see rising humidity and a higher likelihood of thunderstorms. Starting Thursday, subtropical moisture from Baja California will bring isolated showers and possible virga, primarily affecting mountainous regions. Humidity levels will increase throughout the week, with temperatures ranging widely across coastal and desert areas. A return of the marine layer is anticipated, leading to drier conditions by the weekend. Residents should prepare for shifting weather, especially thunderstorms in mountainous areas and elevated surf risks along the coast.
San Diego is set to experience rising humidity and increased chances of thunderstorms this week as the monsoon season begins. An area of low pressure moving northwest from the south will bring subtropical moisture from Baja California starting Thursday afternoon. Residents can expect weather patterns that include mid-level altocumulus clouds and potential virga—rain that evaporates before it touches the ground.
On Thursday, isolated showers and stray thunderstorms are likely, particularly in the mountains of San Diego and San Bernardino County during the afternoon hours. Some of these showers may drift westward from the mountains to the North County coast, where light sprinkles could reach residents by Thursday afternoon.
As the week progresses, humidity levels will be on the rise, creating a muggier feel towards the end of the work week. Forecasted temperatures for Thursday show that coastal areas will experience lows in the low 70s, while valleys and mountains may reach into the low 80s. The desert regions are expected to hit upper 90s.
A marine layer is expected to return Wednesday evening into Thursday, clearing up by late Friday morning. As the upper low pressure area exits over the weekend, drier conditions are anticipated, leading to typical July weather into early next week. Storm chances will also extend to coastal areas from Thursday night into Friday, where brief showers or thunderstorms may occur.
Humidity levels on Friday will surpass those of Thursday, with an increased potential for afternoon thunderstorms, particularly in mountainous regions. In contrast, Saturday is projected to be muggy with no significant rain chances according to current forecasts.
By Sunday, forecasts predict a shift to dry weather, with steady conditions extending into the early part of the following week. Originally, there were expectations of rain and thunderstorms on Tuesday night, primarily affecting mountain communities. Activity could commence around 8:00 p.m. and taper off by midnight. Elevated humidity on Tuesday may result in a sticky afternoon, though temperatures remain near normal.
The elevated humidity levels are mainly attributed to the remnants of Tropical Storm Alvin located in the Eastern Pacific. Moreover, elevated surf conditions of 4 to 6 feet, with sets possibly reaching up to 7 feet, are expected alongside strong rip currents, posing potential risks for swimmers at the coast.
As the monsoon season unfolds, residents in San Diego should prepare for heightened humidity and shifting weather conditions in the coming days. Particular attention should be paid to the potential for thunderstorms in mountainous areas and the safety risks associated with increased surf and currents along the coastline.
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