A storm brought bringing widespread showers to the San Diego area, dropping modest amounts of moisture on Tuesday — with another round of rain on the way.
Around one inch is expected near the coast, with up to five inches anticipated in some mountain areas, National Weather Service San Diego said.
“The most likely time for widespread and heavier precipitation is very late Wednesday night into Thursday morning with a passing cold front providing lift in a saturated environment,” the NWS added. “This system is expected to be quite cold aloft which increases the chances of thunderstorms across the area, leading to an increased threat of flooding.”
Forecasts are indicating rainfall rates of 0.50 to 0.75″ per hour, but up to 1″ per hour in the mountains below the snow level and where thunderstorms develop.
Flood watches will be in effect from Wednesday evening through at least Thursday afternoon for local coastal areas, mountains, valleys, and foothills, including the cities of Carlsbad, Chula Vista, El Cajon, Encinitas, Escondido, Julian, National City, Oceanside, Poway, San Diego, San Marcos, Santee, and Vista.
“We know how impactful heavy rain can be, and we want to ensure that both the city’s stormwater infrastructure and our residents are ready to face the weather,” city Stormwater Department Director Todd Snyder said. “We can all take a few simple steps to better prepare for incoming storms and help reduce flood risk.”
Sandbags are available in limited amounts to the public at eleven recreation centers centrally located in each San Diego City Council district.
The county and Cal Fire are providing free bags and sand at numerous fire stations for people who live in unincorporated areas, but residents have to bring their own scoop or shovel.
Tallies for the first set of showers as of Tuesday evening were 0.77″ on Palomar Mountain, 0.56″ at Henshaw Dam, 0.50″ in Valley Center, 0.45″ in Santee, 0.90″ at the San Diego International Airport, 0.45″ in Julian, 0.28″ in Poway, 0.15″ in Ocotillo Wells, and 0.24″ in Borrego Palm Canyon.
Cooling temperatures are expected throughout the week, with highs in downtown San Diego in the lower 60s Wednesday and the upper 50s Thursday and Friday. In the deserts, temperatures should reach the low 60s to mid-70s, and in the mountains daily highs will top out in the 40s through the rest of the workweek.
A wind advisory will be in effect from 7 p.m. Wednesday to at least 5 a.m. Friday for county deserts, accompanied by a winter storm watch from Thursday morning through Friday morning for county mountains.
Additionally, a small craft advisory will be in effect from 10 p.m. Wednesday to at least 2 a.m. Friday for coastal waters from San Mateo Point to the U.S.-Mexico border, and out to 30 nautical miles from San Mateo Point to the Mexican border extending 30 to 60 nautical miles out, including San Clemente Island.
Thursday’s San Diego-area surf forecast includes a high-risk rip current, with surf from 4 to 6 feet, sets to 7 feet, slight chance of a potential thunderstorm and mixed swell from 260 and 220 degrees.
Marine forecasters said the next storm should arrive Wednesday night and could initially bring strong south winds 15 to 25 knots, with gusts to 30 knots. The winds may switch to the west to northwest 20 to 30 knots, with gusts close to gale force Thursday and expects to continue until late Thursday night.
“These winds will produce hazardous boating conditions Wednesday night through Thursday night. There is a slight chance of thunderstorms Thursday. Conditions will improve Friday through Saturday,” the NWS said.
Gradually clearing skies with a possibility of scattered light showers should prevail through the weekend, followed by a chance of more wet weather across the county next week.
City News Service contributed to this report.
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