Unseasonably Warm Temperatures & Atmospheric Rivers: A Christmas Week Weather Outlook
A traditional White Christmas is looking unlikely for much of the United States this year. Instead,prepare for a potentially record-breaking warm spell and significant flooding risks across the country. This article provides a detailed look at the developing weather patterns, potential impacts, and the role climate change is playing in these events.
The Big Picture: A powerful combination of high-pressure systems and atmospheric rivers is creating a dramatic and potentially hazardous weather scenario as we head into the Christmas holiday. Dozens of temperature records are in jeopardy, and millions are under flood watch.
Heat Wave Sweeps Across the South & southeast
The most striking aspect of this forecast is the unseasonable warmth gripping the southern United States.
* Thursday’s high temperatures are forecast to reach the 70s across large portions of the South and Southeast.
* Parts of Texas could even see temperatures climb into the 80s.
* Some areas will experience highs a staggering 30 degrees above normal for this time of year.
While warm air intrusions aren’t unheard of in late December, experts at Climate Central indicate this event is “at least two to three times more likely to occur due to human-caused carbon pollution.” They are utilizing “rapid attribution” techniques to quickly connect this specific weather event to the broader trends of climate change. This highlights the increasing frequency and intensity of extreme weather events linked to a warming planet.
California Braces for Major flooding & Snow
While the South heats up, California is facing a different, but equally concerning, weather threat: a potent atmospheric river.
* This atmospheric river is expected to unleash major downpours and widespread flooding across the state this week.
* The National Weather service (NWS) in Los Angeles warns of “significant and widespread urban roadway flooding,” a high risk of mudslides, and rapid rises in waterways, potentially leading to swift water rescues.
* Currently, over 40 million people are under flood watch as of Tuesday morning.
Adding to the complexity, the Sierra Nevada mountains are bracing for a “prolonged heavy snow event.” This combination of rain and snow presents a multifaceted challenge for California residents. Tragically, one person in Redding, California, died over the weekend after becoming stranded in their car during previous flooding, underscoring the dangers.
what does this mean for you? Stay informed about local weather alerts,heed evacuation warnings,and avoid needless travel in affected areas.
Understanding Atmospheric Rivers
Atmospheric rivers are long, narrow regions in the atmosphere that transport vast amounts of water vapor – essentially, rivers in the sky. When these rivers make landfall, they can release this moisture as intense rainfall or snowfall.While crucial for California’s water supply, they can also cause devastating flooding and landslides.
The Role of Climate change
The increasing intensity of atmospheric rivers and the frequency of extreme heat events are consistent with the predicted impacts of climate change. A warmer atmosphere holds more moisture, leading to heavier precipitation.Additionally, changes in atmospheric circulation patterns can exacerbate these events.
Evergreen Insights: Weather, Climate, and preparedness
Beyond the immediate forecast, it’s crucial to understand the long-term trends shaping our weather patterns. Climate change isn’t just about rising temperatures; it’s about increased variability and more frequent extreme events. Building resilience to these changes requires proactive planning, investment in infrastructure, and a commitment to reducing carbon emissions. Staying informed and prepared is your best defense against the impacts of a changing climate.
Frequently Asked Questions
Q: What is an atmospheric river?
A: An atmospheric river is a concentrated band of moisture in the atmosphere, transporting water vapor from the tropics to higher latitudes, often resulting in heavy precipitation when it makes landfall.
Q: How does climate change affect atmospheric rivers?
A: Climate change is increasing the intensity of atmospheric rivers, as a warmer atmosphere can hold more moisture, leading to heavier rainfall and increased flood risk.
Q: Is this heat wave unusual for December?
A: While some warmth is normal for December, the current heat wave is considerably above average and is estimated to be two to three times more likely due to human-caused climate change.
Q: What should I do to prepare for potential flooding?
A: Stay informed about local weather alerts, have an evacuation plan, secure valuables, and avoid driving through flooded areas.
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