Southern California can't catch a break this week. Tropical Storm Rachel is churning northward off Mexico's Pacific coast and steering straight for a weekend collision with a region that just spent days baking under record-breaking October heat. Forecasters say the storm's remnants could dump heavy rain, whip up dangerous surf, and trigger coastal flooding across the Southland from late Saturday through Monday.
Tropical Storm Rachel is delivering a weather whiplash almost nobody saw coming this fast. One week it's triple digits in October; the next, sandbags and flood advisories.
Tropical Storm Rachel's Unusual Turn Toward California
Rachel started the week as Tropical Depression Twenty-E off southern Mexico. By Wednesday it had strengthened into a hurricane, with the National Hurricane Center forecasting continued strengthening in an environment of low wind shear and very warm sea surface temperatures. Senior hurricane specialist Richard Pasch noted the storm was moving northward, skirting close to the Mexican coast.
Then the forecast took a strange turn. A powerful low-pressure system off the California coast began tearing at the storm while simultaneously dragging its moisture north. The result: Tropical Storm Rachel is expected to weaken into a post-tropical system before reaching land — but that weakening may not matter much. What Southern California will feel isn't a hurricane's winds but a tropical storm's water.
In a historic move, the National Hurricane Center issued a Tropical Storm Watch for a stretch of the Southern California coast — only the second time in history such a watch has been issued for the region. The watch covered the coast from the California-Mexico border to the Orange County-San Diego county line, and inland across a broader region.
Daniel Swain, a climate scientist with the University of California, noted on October 7 that some models were showing a strong low-pressure system that could generate onshore winds and worsen coastal flooding.
A heat wave for the record books
Before any of this, Southern California endured a brutal October heat wave. Several weather stations set new all-time October highs on October 6. Escondido hit 105, breaking records from 1953 and 1893. Vista and Ramona reached 101. Anaheim touched 100. Downtown Los Angeles topped 100 degrees for five straight days — the longest such October streak ever recorded there. San Diego logged two consecutive 100-degree days, only the third time that's happened in any month since records began in 1874.
Ryan Kittell, a meteorologist at the National Weather Service in Oxnard, said what everyone in the region wanted to hear: "We do see relief on the way."
Relief is coming. It's just arriving with a fire hose.
What the Weekend Could Bring
The National Weather Service says moisture associated with Tropical Storm Rachel could reach Los Angeles County as early as Saturday morning, though Saturday night into Sunday morning looks more likely. Rain chances continue into Monday, with a slight chance of thunderstorms. The best shot at meaningful rain lands Sunday into Monday, when highs that hit the mid-90s on Thursday could plunge into the 70s.
Most lower-elevation areas can expect roughly half an inch to an inch of rain. Mountain communities could see much more — the Santa Ana and San Bernardino mountains may pick up over an inch, with isolated slopes getting 2 inches or more. Wrightwood and Oak Glen, mountain towns scarred by past flooding and debris flows, are on particular watch.
The coast faces its own threat. Forecasters warn of 10- to 12-foot waves along San Luis Obispo, Santa Barbara, Ventura, Los Angeles and Orange counties, with rogue waves up to 15 feet possible. Coastal flooding is likely from Sunday morning through Wednesday evening, with the highest risk at Sunday's morning high tide. Long Beach opened four additional sandbag distribution sites on Thursday, and the Alamitos Peninsula — already battered by erosion — is among the most vulnerable spots.
Surf and rip currents
As Tropical Storm Rachel's moisture streams ashore, the surf could reach 3 to 6 feet along south-facing beaches, and the National Weather Service warned of "minor to locally moderate coastal flooding with elevated surf and dangerous rip currents" for Malibu and other Los Angeles County beaches. Rip currents can pull swimmers out to sea, wash people off rocks, and capsize small boats near shore.
Sources and Resources
– High Surf, Hot Temperatures Roil and Broil LA — MyNewsLA – From Dangerous Heat to Rain and Flooding, What to Expect This Weekend — Ventura County Star – Hurricane Rachel Leaves Forecasters Stunned as It Gains Strength Toward Pacific Coast — NY Post – Tropical Storm Rachel Will Likely Make Northward Turn Toward San Diego — Weather West
Frequently Asked Questions
Is Tropical Storm Rachel going to hit California as a hurricane?
No. Rachel is expected to weaken into a post-tropical system before reaching Southern California. The threat isn't hurricane-force winds — it's heavy rain, thunderstorms, dangerous surf, and coastal flooding from the storm's tropical moisture combining with a low-pressure system.
When will the rain start in Southern California?
Rain could reach Los Angeles County as early as Saturday morning, October 10, though Saturday night into Sunday morning is the likelier window. Showers could linger through Monday and into Tuesday. The heaviest rain is currently expected Sunday morning into the early afternoon in Orange, Riverside, and San Bernardino counties.
Why did the National Hurricane Center issue a Tropical Storm Watch for SoCal?
Because Rachel made an unusually close approach, steered northward by a trough that could even let it re-strengthen slightly before landfall. It's only the second time in history the NHC has issued such a watch for Southern California.
How bad could the flooding be?
With Tropical Storm Rachel's moisture overhead, most lower-elevation areas should see a half-inch to an inch of rain, but mountain areas could get 2 inches or more — enough to trigger flash flooding and debris flows in burn-scarred areas like Wrightwood and Oak Glen. Coastal flooding is likely Sunday through Wednesday, worst around Sunday's morning high tide.
How does this compare to past California tropical storms?
Tropical systems reaching California are rare but not unheard of — Hurricane Hilary in 2023 was the most recent major example. Rachel stands out because of the extreme whiplash: record October heat one week, a tropical moisture bomb the next, with record-warm Pacific waters fueling both.
Conclusion
Tropical Storm Rachel is the kind of storm that reminds Californians their climate doesn't do gradual. Days after the hottest start to October on record — five straight 100-degree days in downtown LA, broken records from Escondido to San Diego — the same region is sandbagging for rain, flooding, and 12-foot surf. Tropical Storm Rachel itself will likely arrive weakened, but the water it carries could make this one of the most consequential October weekends Southern California has seen in years. If you're anywhere near the coast or the mountains this weekend, keep an eye on the sky — and the forecast.
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