NWS Humidity Thunderstorms
Stormy conditions in San Diego Wednesday Sept. 4, 2019. Photo credit: National Weather Service, @NWSSanDiego, via Twitter.

Humidity and high temperatures in the San Diego region combined Wednesday to generate thunderstorms and downpours throughout the county.

The bouts of lightning mostly lit skies in East County. They also sparked along the coast, including Chula Vista, Oceanside and San Diego, according to the National Weather Service.

The agency recorded 396 cloud-to-ground lightning strikes over the day.

The unsettled atmospheric conditions – courtesy of monsoonal moisture out of Mexico and late-summer heat – also included high winds and cloudbursts. The weather led to scattered power outages.

Over the 12-hour period ending at 4:30 p.m., the showers dropped 1.17 inches of moisture in Pine Valley; 1.07 in Cameron Corners; 0.55 in Descanso and Echo Dell; 0.49 in Oak Grove; 0.35 on Mount Woodson; 0.34 in Escondido, and 0.23 in Alpine and Flinn Springs.

Other rainfall readings over the period included 0.2 inches in Harbison Canyon; 0.18 in Granite Hills; 0.16 in El Cajon; 0.14 at Brown Field and in Rancho Bernardo; 0.12 in Santee, and 0.11 in La Mesa.

Officials recorded trace amounts at SeaWorld, Mission Beach, Kearny Mesa, La Jolla and Lemon Grove.

In the late afternoon, utility crews worked to restore power to areas affected by power outages, mostly centered in East County, according to San Diego Gas & Electric.

The conditions also caused tangles on area freeways and highways. On Interstate 8 in Lakeside, a car hydroplaned and crossed into oncoming traffic, causing an injury accident.

First responders transported motorists in two vehicles to the hospital for treatment. Officials issued a SIG Alert in response.

Forecasters expected the hot, soupy conditions to continue prior to a cooling trend from the end of the workweek through Monday, weather service meteorologist Noel Isla said.

– City News Service and staff reports