View of the showers and storms from NWS headquarters Friday morning. Photo via @NWSSanDiego Twitter

An early autumn storm generated on-again, off-again downpours punctuated by flashes of lightning and booming thunder throughout the San Diego area Friday.

The wet and blustery conditions, churned up by a low-pressure system circulating over northern Baja California, put an end to lingering summery warmth and delivered anywhere from a few tenths of an inch to nearly two inches of precipitation across the county, according to the National Weather Service.

The cloudbursts led to road flooding in various locations over the afternoon, among them Campo Road at North Bonita Street in Spring Valley; southbound Interstate 5 near Civic Center Drive in National City; westbound state Route 94 near Avocado Boulevard in Casa de Oro; Campo Road near Via Mercado and Jamacha Road at Willow Glen Drive in Rancho San Diego; and westbound I-8 near College Avenue in Del Cerro.

In addition, OnScene.TV reported that the storm toppled a 60-foot tree in La Mesa and caused a mudslide on state Route 94 in Rancho San Diego.

The tree fell in the 4500 block of Panorama Drive, bringing down power lines and hitting a home across the street, puncturing the roof. No one was home at the time.

On the 94, on the westbound side near Via Mercado, the mud covered all lanes and trapped two vehicles. The California Highway Patrol shut down the lanes and called in Caltrans to clear the mud.

Crews clear the mud on state Route 94. Photo credit: OnScene.TV

Rainfall totals as of 5:15 p.m. included 1.92 inches at Boucher Hill; 1.69 in Pala; 1.68 in the Palomar area; 1.49 in Mesa Grande; 1.04 in Descanso; 0.89 in La Mesa; 0.56 in Point Loma and University Heights; 0.5 in Mission Valley; 0.48 at Lindbergh Field; 0.44 on Mount Laguna; 0.39 in Harbison Canyon; 0.38 at Birch Hill; 0.37 in Lemon Grove; 0.18 at SeaWorld San Diego; 0.15 in Valley Center; 0.14 in Agua Caliente; 0.12 in Pine Valley; and 0.04 in San Felipe.

Over the weekend, the chance for more local rains will steadily decrease and mostly be confined to the mountains and deserts.

The weather will continue to cool down, with most areas experiencing temperatures around 5 degrees below average by Sunday, according to meteorologists.

The fallen tree in La Mesa. Photo credit: OnScene.TV

City News Service contributed to this article.

Updated 8:25 p.m. Sept. 24, 2021

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