Kevin Schneider

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It's been months since meaningful snow fell over the higher terrain of California, but that's going to change in the days ahead. Heavy rain, snow, and gusty winds are on the way to the Golden State as a strong trough digs south from Canada to start the work week. Expect impacts to travel in higher terrain, especially over I-80 and CA SR 50 on either side of Lake Tahoe. Over a foot of snow could fall on these corridors.<h1>Forecast</h1>Scattered rain and snow showers will drift south through the overnight, delivering the first round of snow to the Sierra. Rain moves south along the coast to Los Angeles by Tuesday morning as snow continues in the Central Sierra. Conditions are expected to improve by Wednesday.<video src="https://media.weathernationtv.com/app/uploads/2025/10/10-13 west vans3k-1760407474437.mp4" controls="true" width="100%"></video>Rainfall totals look impressive for an October storm system in California, as it's a bit early in the season for precipitation this heavy. Pockets of 1-3 inches of rain are expected, with isolated totals approaching 4". Rainfall rates and the potential for flooding will likely be highest Monday afternoon through Tuesday morning.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web6-1760442203677.png"><h1>Snowfall</h1>Snow totals are expected to top a foot or even two feet in the high Sierra, while areas around the Donner Pass can expect 6-12 inches at the summit. Be sure to carry chains and use them once the requirement is put into effect. The heaviest snow is expected from Monday evening into Tuesday.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web4-1760442028168.png">Winter Storm Warnings (Pink) and Winter Weather Advisories (Purple) have been issued for the Sierra Nevada, including South Lake Tahoe and Mammoth Lakes, with treacherous travel expected.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web5-1760442053474.png">This will be the first storm this season for the Sierra Nevada. Make sure you are prepared for winter driving across the passes! Heavy bursts of snow are likely at times in the Central Sierra.<h1>Severe Threat</h1>With such a potent trough ushering in the cold air to fire up snow, it will also help organize storms in the lower elevations. Which means the threat of a few severe storms will move in as the storms do tonight. For areas closer to Los Angeles, it could be after midnight before storms push in.<h1><img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-13 100505-1760371875330.png">Rain &amp; Flooding</h1>Heavy rain is another worry with recently burned scarred land in California.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-14 070827-1760447320272.png">Flash flooding and debris flows will be possible through Tuesday. Up to 3 inchces of rainfall look possible for some of the burn scarred areas of southern California from recent wildfires. <img src="https://media.weathernationtv.com/app/uploads/2025/10/Web8-1760442304430.png">Stay with Weather Nation for the latest, with your West Regional forecast every :50 past the hour.

California: Flooding Rain, Heavy Snow, Isolated Tornadoes

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Flash flooding will continue to be possible in the southwestern United States over the next couple of days. Be sure to <a target="_blank" rel="noopener noreferrer nofollow" href="https://msc.fema.gov/portal/home">check your property's flood zone</a> and have a plan to seek higher ground if necessary. NEVER drive through flood waters if you cannot easily see the water's depth or the road below it. Multiple water rescues have been needed over the past few days. Remember, you're not only risking your life but the lives of the first responders if you drive into flooded roads. <div class="twitter-tweet" style="display: flex; justify-content: center" data-twitt-post-id="1977396340784067042" src="https://x.com/WeatherNation/status/1977396340784067042"></div> The remnant moisture from the two most recent tropical systems in the Eastern Pacific, Priscilla and Raymond, led to heavy showers and thunderstorms over a wide range of terrain throughout the weekend. and now a trough out west and a ridge out east are helping to funnel moisture into New Mexico and Colorado. Several inches of rain are expected across the Four Corners with isolated heavier totals.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web2-1760441716389.png">In addition to the flood threat, severe storms are possible through Wednesday as the trough moving through the northern Rockies increases wind shear farther south. Damaging wind gusts have been a problem already this week, with places like Tempe clocking 71 mph winds from a microburst.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web3-1760441806773.png">We have seen heavy rain and flooding with these storms, and that threat will continue over the next few days. The surge of moisture through Tuesday from Raymond will also increase flood chances for areas of Arizona, New Mexico, and Colorado.<video src="https://media.weathernationtv.com/app/uploads/2025/10/10-13 rsw bnams-1760408633090.mp4" controls="true" width="100%"></video>We'll be detailing this more live on WeatherNation. For a more immediate update on your southwest regional forecast, be sure to tune in at:50!

Flooding Concern Continues in the Southwest

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Alana Cameron was born and raised in Canada in the city of Mississauga, just outside of Toronto. Alana is the oldest of 4 siblings, all close in age, and grew up playing outside with them in all types of weather. After graduating high school, Alana moved to study at the University of British Columbia in Kelowna for a year before transferring to Dalhousie University in Halifax, Nova Scotia where she completed a Bachelor of Science in Physics and Atmospheric Science. Upon completion, Alana moved back to Toronto where she completed a post-grad degree in Meteorology at York University. After her post-grad, she went on to complete another post-grad in Broadcast Journalism - TV News at Fanshawe College in London, Ontario. During her final year of studies she had the privilege of interning with the best in the business in Canada at The Weather Network. Once she finished her internship, she got the call from small-town Denison, Texas where she accepted a job as an on-air meteorologist at KTEN-TV, right in tornado alley, covering severe weather from Sherman/Denison (North Texas) to Ada (Southern Oklahoma). After the most active tornado season Oklahoma had seen in May 2019 (105 tornadoes!) Alana is excited to join WeatherNation to cover weather all across the nation. If you're interested in following her on social media she can be found @alanacameronwx!

Alana Cameron

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NORTHWEST - After winter weather alerts were issued last week in the northwest, and snow totals topped out at 25", another round of potential snowfall is in store for the northwest.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-13 203655-1760409468608.png">This next round will be much more scattered in nature and may take a day or so to really accumulate on the mountain peaks. Currently ,there are no winter weather alerts in place for the Rockies, but rain and snow are certainly in the forecast.<video src="https://media.weathernationtv.com/app/uploads/2025/10/10-13 rnw bams-1760407820926.mp4" controls="true" width="100%"></video>From now through Friday, rain totals may reach an inch and snowfall totals may surpass half a foot, especially in the Tetons, northern Rockies, and Bitteroots.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web1-1760441588494.png">For more details on how this may impact temperatures, be sure to join us at :50 past the hour on TV for your west regional forecast.

Adrian Hernandez

Another Round of Snow for the Rockies

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Rob grew up in South Florida, where daily afternoon storms and hurricanes piqued his interest in meteorology early on. That interest was fostered by his teachers and his father, who one time brought him onto the roof of their home to watch a funnel cloud move through the Everglades several miles away. Years of filmmaking and tv production in high school gradually pushed him toward broadcast meteorology at Florida State University, where he joined and eventually led the student run daily weather show. After graduating with a Bachelors of Science in Meteorology, he began his career at KESQ in Palm Springs, California before heading to KFSN in Fresno and WLOS in Asheville, North Carolina. He has covered a diverse array of extreme weather events, including haboobs and flash flooding in the desert, extreme snow in the Sierra, hurricanes, and Appalachian ice storms. He also enjoys telling stories and reporting about weather issues.

Connect with Rob on <a href="https://twitter.com/WxRobBradley">Twitter</a>

Rob Bradley

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La Niña was observed in September, leading to NOAA issuing a La Niña advisory. These conditions are expected to persist through winter into spring, with impacts likely for the upcoming winter season and beyond into next spring. La Niña often plays a role in determining storm tracks during the winter season and severe weather into the spring.<h1>What is La Niña?</h1>La Niña is one phase of a large circulation over the equatorial Pacific Ocean. The prevalent wind direction will churn up cooler or warmer water, based on the direction of the circulation. When winds are prevailing from the east, it churns up cooler waters near the coast of South America and to the west, while areas in the western Pacific see warmer than average water temperatures during this phase. These cooler waters, along with other large scale circulations, impact how air flows across the United States.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 110029-1760115646348.png">During strong La Niñas, the jet stream is typically more active from the Northwest through the Great Lakes. This effect is typically less pronounced during weaker events. This often favors better chances for precipitation across the northern tier of the country, including the Northwest and Great Lakes.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 095632-1760111817342.png"><h1>Impact for Winter 25'-26'</h1>NOAA releases their outlook for the upcoming winter season this Thursday (October 16th) but the Climate Prediction Center continuously updates outlooks for three month periods. These outlooks likely won't change much with next week's update but we'll bring you that forecast when it's released. The temperature and precipitation outlooks for December - February show conditions typical for a La Niña year, with below average temperatures favored in the Pacific Northwest.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 095641-1760111827269.png">The precipitation outlook also favors conditions fairly typical for a La Niña winter, with above average precipitation favored around the Northern Rockies and Great Lakes/Ohio Valley.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 095637-1760111827269.png"><h1>Spring Severe Weather / Tornado Impacts</h1>La Niña is expected to decay through the spring months, which can have a big impact on the severe weather season. <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.gfdl.noaa.gov/research_highlight/u-s-regional-tornado-outbreaks-and-their-links-to-spring-enso-phases-and-north-atlantic-sst-variability/">Studies have shown</a> a increase in the potential for tornado outbreaks over certain areas of the country as La Niña decays into a neutral or El Niño phase. These favored areas include the Central/Southern Plains and around the lower Great Lakes into the Mid-Mississippi Valley.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 105635-1760115430383.png">This phase also <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.aoml.noaa.gov/wp-content/uploads/2019/06/ENSO_Tornado_Lee.pdf">favors stronger tornadoes</a>, as the number of high end tornadoes and outbreaks increase during this phase.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-10 100658-1760112433708.png">Seasonal forecasts are difficult to predict with accuracy, so be sure to check the weather forecasts often with WeatherNation for the latest.

Tracey Anthony

La Niña Advisory Issued, Potential Impacts to Winter Precip & Springtime Tornadoes

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A low-pressure system that has tracked up the East Coast continues to bring threats of coastal flooding, heavy rainfall, and strong winds. While this system has not developed, and is not expected to develop, any tropical characteristics, it’s behaving much like an early-season Nor’easter, delivering similar impacts minus the cold and snow. Areas along the shores of North Carolina to New England were impacted by this system.<div class="twitter-tweet" style="display: flex; justify-content: center" data-twitt-post-id="1977894622975430882" src="https://x.com/WeatherNation/status/1977894622975430882"></div>The system is expected to move away from the coast through Tuesday but New Jersey still had a handful of strong wind reports on Monday. <img src="https://media.weathernationtv.com/app/uploads/2025/10/Web 14-1760436387824.png"><h2>Rainfall</h2>Heavy rain was very localized from this system, and will be far and few especially as it moves away from the East Coast. But a few daily rainfall records were still broken on Monday. <img src="https://media.weathernationtv.com/app/uploads/2025/10/Web 13-1760436496566.png">A few scattered rain showers still remain possible.<video src="https://media.weathernationtv.com/app/uploads/2025/10/10-13 east-1760408242196.mp4" controls="true" width="100%"></video>Coastal flood alerts have been slowly ending for much of the Atlantic Coast. Sea water flooding during high tides could still approach 2-3 feet of inundation in some areas (warning areas in dark green).<img src="https://media.weathernationtv.com/app/uploads/2025/10/Web 12-1760436278168.png">The major flood stage is expected to be reached around the southern Chesapeake, mostly during high tides. Prepare for sea water inundation to continue into Monday.<img src="https://media.weathernationtv.com/app/uploads/2025/10/Screenshot 2025-10-13 124158-1760380926209.png">Stay with WeatherNation for the latest updates.

Another Round of Snow for the Rockies

La Niña Advisory Issued, Potential Impacts to Winter Precip & Springtime Tornadoes

October Nor'easter Wrapping Up For the Atlantic

California: Flooding Rain, Heavy Snow, Isolated Tornadoes

Flooding Concern Continues in the Southwest

Another Round of Snow for the Rockies

La Niña Advisory Issued, Potential Impacts to Winter Precip & Springtime Tornadoes

October Nor'easter Wrapping Up For the Atlantic

California: Flooding Rain, Heavy Snow, Isolated Tornadoes

Flooding Concern Continues in the Southwest

Another Round of Snow for the Rockies

La Niña Advisory Issued, Potential Impacts to Winter Precip & Springtime Tornadoes

October Nor'easter Wrapping Up For the Atlantic