Science
That Arctic blast can feel brutally cold, but how much colder than ‘normal’ is it really?
Richard B. (Ricky) Rood, University of Michigan
An Arctic blast hitting the central and eastern U.S. in early January 2025 has been creating fiercely cold conditions in many places. Parts of North Dakota dipped to more than 20 degrees below zero, and people as far south as Texas woke up to temperatures in the teens. A snow and ice storm across the middle of the country added to the winter chill.
Forecasters warned that temperatures could be “10 to more than 30 degrees below normal” across much of the eastern two-thirds of the country during the first full week of the year.
But what does “normal” actually mean?
While temperature forecasts are important to help people stay safe, the comparison to “normal” can be quite misleading. That’s because what qualifies as normal in forecasts has been changing rapidly over the years as the planet warms.
Defining normal
One of the most used standards for defining a science-based “normal” is a 30-year average of temperature and precipitation. Every 10 years, the National Center for Environmental Information updates these “normals,” most recently in 2021. The current span considered “normal” is 1991-2020. Five years ago, it was 1981-2010.
But temperatures have been rising over the past century, and the trend has accelerated since about 1980. This warming is fueled by the mining and burning of fossil fuels that increase carbon dioxide and methane in the atmosphere. These greenhouse gases trap heat close to the planet’s surface, leading to increasing temperature.
Because global temperatures are warming, what’s considered normal is warming, too.
So, when a 2025 cold snap is reported as the difference between the actual temperature and “normal,” it will appear to be colder and more extreme than if it were compared to an earlier 30-year average.
Thirty years is a significant portion of a human life. For people under age 40 or so, the use of the most recent averaging span might fit with what they have experienced.
But it doesn’t speak to how much the Earth has warmed.
How cold snaps today compare to the past
To see how today’s cold snaps – or today’s warming – compare to a time before global warming began to accelerate, NASA scientists use 1951-1980 as a baseline.
The reason becomes evident when you compare maps.
For example, January 1994 was brutally cold east of the Rocky Mountains. If we compare those 1994 temperatures to today’s “normal” – the 1991-2020 period – the U.S. looks a lot like maps of early January 2025’s temperatures: Large parts of the Midwest and eastern U.S. were more than 7 degrees Fahrenheit (4 degrees Celsius) below “normal,” and some areas were much colder.
But if we compare January 1994 to the 1951-1980 baseline instead, that cold spot in the eastern U.S. isn’t quite as large or extreme.
Where the temperatures in some parts of the country in January 1994 approached 14.2 F (7.9 C) colder than normal when compared to the 1991-2020 average, they only approached 12.4 F (6.9 C) colder than the 1951-1980 average.
As a measure of a changing climate, updating the average 30-year baseline every decade makes warming appear smaller than it is, and it makes cold snaps seem more extreme.
Conditions for heavy lake-effect snow
The U.S. will continue to see cold air outbreaks in winter, but as the Arctic and the rest of the planet warm, the most frigid temperatures of the past will become less common.
That warming trend helps set up a remarkable situation in the Great Lakes that we’re seeing in January 2025: heavy lake-effect snow across a large area.
As cold Arctic air encroached from the north in January, it encountered a Great Lakes basin where the water temperature was still above 40 F (4.4 C) in many places. Ice covered less than 2% of the lakes’ surface on Jan. 4.
That cold dry air over warmer open water causes evaporation, providing moisture for lake-effect snow. Parts of New York and Ohio along the lakes saw well over a foot of snow in the span of a few days.
The accumulation of heat in the Great Lakes, observed year after year, is leading to fundamental changes in winter weather and the winter economy in the states bordering the lakes.
It’s also a reminder of the persistent and growing presence of global warming, even in the midst of a cold air outbreak.
Richard B. (Ricky) Rood, Professor Emeritus of Climate and Space Sciences and Engineering, University of Michigan
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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The Unfavorable Semicircle Mystery: The YouTube Channel That Uploaded Tens of Thousands of Cryptic Videos
In 2015, the YouTube channel Unfavorable Semicircle gained attention for its enigmatic and abundant video uploads, totaling over 70,000 before its deletion in 2016. Theories about its purpose vary, from automated content generation to digital art experimentation, leaving its intent unresolved.
In the vast digital landscape of the internet, strange phenomena occasionally emerge that leave investigators, tech enthusiasts, and everyday viewers scratching their heads. One of the most puzzling cases appeared in 2015, when a mysterious YouTube channel called Unfavorable Semicircle began uploading an astonishing number of cryptic videos.
Within months, the channel had published tens of thousands of bizarre clips, many of which seemed random, incomprehensible, and visually chaotic. But as internet detectives began analyzing the content more closely, they discovered that these videos might not have been random at all.
The Sudden Appearance of an Internet Mystery
The Unfavorable Semicircle channel reportedly appeared in March 2015, with its first uploads arriving in early April.
Almost immediately, the channel began publishing videos at an incredible pace. Observers estimated that the account uploaded thousands of videos per week, sometimes multiple videos per minute. By the time the channel disappeared in early 2016, researchers believed it had uploaded well over 70,000 videos, possibly far more.
The scale alone made the project seem impossible for a human to manage manually.
Strange Visuals and Cryptic Titles
Most of the videos shared similar characteristics:
- Extremely short or very long runtime
- Abstract visuals such as flashing colors, static, or distorted imagery
- Little or no audio, or heavily distorted sounds
- Titles made of random characters, symbols, or numbers
To casual viewers, the videos looked like pure digital noise. However, online investigators suspected something more deliberate was happening.
Hidden Images Discovered
The mystery deepened when researchers began extracting individual frames from some videos.
When thousands of frames from certain clips were stitched together, the results sometimes formed coherent images. One of the most famous examples involved a video titled “LOCK.” While the footage appeared chaotic at first, combining the frames revealed a recognizable composite image.
This discovery suggested the videos were carefully constructed rather than random uploads.
Theories About the Channel’s Purpose
Because the creator never explained the project, several theories emerged across Reddit, YouTube, and internet forums.
Automated Experiment
Many believe the channel was created using automated software that generated and uploaded content at scale.
Alternate Reality Game (ARG)
Some viewers suspected the channel might be part of a hidden puzzle or digital scavenger hunt.
Encrypted Communication
Others compared the channel to Cold War “numbers stations,” suggesting the videos could contain coded messages.
Digital Art Project
Another theory suggests the channel was an experimental art project exploring algorithms, data, and visual noise.
Despite years of investigation, no single explanation has been confirmed.
Why the Channel Disappeared
In February 2016, YouTube removed the channel, reportedly due to spam or automated activity violations.
By that time, the channel had already become a minor internet legend. Fortunately, some researchers managed to archive a large portion of the videos before they disappeared.
Even today, archived clips continue to circulate online as investigators attempt to decode them.
Other Mysterious YouTube Channels
The Unfavorable Semicircle mystery is not the only strange case on YouTube.
One well-known example is Webdriver Torso, a channel that uploaded hundreds of thousands of videos showing red and blue rectangles with simple beeping sounds. Internet speculation ran wild before Google eventually confirmed it was an internal YouTube testing account.
Another example is AETBX, which posts distorted visuals and unusual audio that some viewers believe contain hidden patterns or encoded information.
These cases highlight how automation, experimentation, and creativity can sometimes blur the line between technology and mystery.
A Digital Mystery That Remains Unsolved
Nearly a decade later, the true purpose behind Unfavorable Semicircle remains unknown.
Was it a sophisticated experiment? A piece of algorithmic art? Or simply an automated test that accidentally captured the internet’s imagination?
Whatever the explanation, the channel stands as a reminder that even in a world filled with billions of videos and endless information, the internet can still produce mysteries that challenge our understanding of technology.
Why Internet Mysteries Still Fascinate Us
Stories like Unfavorable Semicircle capture attention because they combine technology, creativity, and the unknown. They invite people from around the world to collaborate, analyze patterns, and search for meaning hidden in the noise.
And sometimes, the most intriguing part of the mystery is that the answer may never fully be known.
Related Coverage & Further Reading
- Atlas Obscura – The Unsettling Mystery of the Creepiest Channel on YouTube
- Her Campus – Top 5 Most Obscure Internet Mysteries
- Medium – Unfavorable Semicircle: The YouTube Mystery No One Can Solve
- Gazette Review – Top 10 Strangest YouTube Channels Ever
- Decoding the Unknown – Unfavorable Semicircle YouTube Mystery Archive
- Wikipedia – Unfavorable Semicircle
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
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The Knowledge
2025 was hotter than it should have been – 5 influences and a dirty surprise offer clues to what’s ahead
The past three years recorded unprecedented global heat, with 2025 being particularly warm. Factors such as greenhouse gas emissions and a decline in solar activity influenced temperatures and extreme weather patterns.
Michael Wysession, Washington University in St. Louis
The past three years have been the world’s hottest on record by far, with 2025 almost tied with 2023 for second place. With that energy came extreme weather, from flash flooding to powerful hurricanes and severe droughts. Yet, by most indicators, the planet should have been cooler in 2025 than it was.
So, what happened, and what does that say about the year ahead?
As an earth and environmental scientist, I study influences that affect global temperatures year to year, such as El Niño, wildfires and solar cycles. Some make Earth hotter. Some make it cooler. And one particularly unhealthy influence has been quietly hiding a large amount of global warming – until now.
Factors that made 2025 cooler than 2024
The Earth’s climate is the result of many factors that change from year to year. Some that helped make 2025 cooler than 2024 include:
La Niña’s arrival: La Niña is part of the El Niño-Southern Oscillation, a natural climate pattern that fluctuates between warm El Niño conditions and cooler La Niña conditions. During El Niño, the Pacific Ocean heats up along the equator, influencing the atmosphere in ways that can cause intense storms, droughts and heat waves around the planet. La Niña does the opposite; it’s like putting an ice pack on the atmosphere.
Both 2023 and 2024 were El Niño years, but in 2025 conditions shifted to neutral and then to La Niña starting in September.
The solar cycle: The Sun reached its solar maximum near the end of 2024, the peak of its energy output in an approximately 11-year cycle, and began declining in 2025. So, while the sun’s output was still stronger than average in 2025, it was less than in 2024.
Fewer wildfires: Despite some destructive blazes, the world also saw fewer wildfires during 2025 than 2024, which put less carbon dioxide – a planet-warming greenhouse gas – into the atmosphere.
Despite those points, 2025 still ended up as the third-hottest year in over 175 years of record-keeping and likely one of the warmest in at least several thousand years. It was nearly as warm as 2023, at 2.6 degrees Fahrenheit (1.47 Celsius) above the 1850-1900 average, according to the European Union’s Copernicus Climate Change Service. It also had the second-highest average land temperature recorded, up 3.6 F (2 C) compared to preindustrial years, with more than 10% of the land experiencing record-high temperatures.
Factors that made 2025 warmer than expected
Several other factors made 2025 warmer than expected, and some are likely to continue to increase in 2026. They include:
Greenhouse gas emissions: The big driver of global warming is excess greenhouse gas emissions, largely from burning fossil fuels, and 2025 had plenty.
Greenhouse gases trap heat near Earth’s surface like a blanket, raising the temperature. They also linger in the atmosphere for years to centuries, meaning gases released today will continue to warm the planet well into the future. The levels of carbon dioxide, methane and nitrous oxide in the atmosphere all increased in 2025.
Rising energy demand drove an increase in fossil fuel use. About 80% of the increasing electric power demand came from emerging economies, largely for rising air conditioning demands as the world gets hotter. In the U.S., the rapid growth of data centers for AI and cryptocurrency mining helped boost U.S. carbon dioxide emissions by 2.4%.
Earth’s energy imbalance: Other sources can disrupt the natural balance between the amount of sunlight that reaches Earth and the lesser amount radiated back to space. A recent study found that Earth’s energy uptake surged and temperatures rose quickly when a rare three-year La Niña in 2020-2022 shifted to El Niño in 2023-2024.
Declining polar ice, which efficiently reflects sunlight back into space, also affects the energy balance. As sea ice declines, it leaves dark ocean water that absorbs most of the sunlight that reaches it. In a spiraling feedback, warmer water melts sea ice, allowing more sunlight into the ocean, warming it faster; 2025 had the lowest winter peak of Arctic sea ice on record and the third-lowest minimum extent of Antarctic ice.
https://datawrapper.dwcdn.net/t0SSd/1
Air pollution: Sulfate aerosol pollution from coal combustion and burning heavy fuel oil in shipping has also been affecting Earth’s energy balance. It has been masking the full effects of human-caused greenhouse gases for years by reflecting sunlight back into space, creating a cooling effect. But sulfate aerosol pollution is also a serious health hazard, blamed for about 8 million human deaths per year from lung diseases.
Recent reductions in sulfate pollution – now 40% less than 20 years ago – have meant about a 0.2 F (0.13 C) increase in global temperatures. Much of the reduction was from China’s efforts to reduce its notoriously bad air pollution in recent years and international shipping rules in effect since 2020 that have reduced sulfur emissions from large ships by 85%.
Taking all factors together, humans are now warming the planet at a faster rate than at any point in human history: at about 0.5 F (0.27 C) per decade. That extra heat can fuel extreme weather, including flash floods, heat waves, extended droughts, wildfires and coastal flooding, affecting human lives and economies.
Predictions for 2026
Most climate models predict 2026 will be about as hot as 2025, depending on whether a Pacific El Niño develops, which forecasters give about a 60% chance of happening. The planet is already starting the year out warm, even if it doesn’t feel like that everywhere. While January was very cold in parts of the U.S., globally, Earth saw its fifth-warmest January on record, and much of the western U.S. saw one of its warmest winters on record.
Solar output will continue to decrease slowly in 2026. However, the International Monetary Fund projects strong global economic growth at about 3.3%, suggesting electricity demand will also continue to grow. The International Energy Agency expects global electricity demand to increase by 3.6% per year through at least 2030.
Even though global renewable energy use is growing quickly, it isn’t growing fast enough to meet rising demand, meaning more fossil fuel use in the coming years. More fossil fuels burned means more emissions and more warming, while the ability of the ocean and land to absorb carbon dioxide continues to decrease. As a result, the atmosphere and oceans heat up, increasing the risks of passing tipping points – glaciers disappear, Atlantic Ocean circulation shuts down, permafrost thaws, coral reefs die.
If greenhouse gas emissions continue at a high rate, humanity may look back at 2025 as one the coolest years globally in the rest of our lives.
Michael Wysession, Professor of Earth, Environmental, and Planetary Sciences, Washington University in St. Louis
This article is republished from The Conversation under a Creative Commons license. Read the original article.
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
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Science
After the Blood Moon: Scientists and Skywatchers React to the March 3, 2026 Total Lunar Eclipse
The March 3, 2026 total lunar eclipse amazed skywatchers worldwide. Scientists and amateur astronomers share reactions and photos from the dramatic blood moon event.
Last Updated on March 5, 2026 by Daily News Staff
Millions of people around the world looked to the sky in the early hours of March 3, 2026 to witness one of the most striking astronomical events of the year — a total lunar eclipse, often referred to as a “Blood Moon.” As the Moon passed completely into Earth’s shadow, it transformed from its familiar silver glow into a deep copper-red color, captivating observers from North America to Asia and across the Pacific.
Blood Moon Aftermath: Scientists and Skywatchers React to the March 3, 2026 Total Lunar Eclipse
For viewers in the western United States, including Arizona and California, the eclipse occurred just before sunrise. The timing created a dramatic scene as the reddish Moon hovered low in the western sky while the eastern horizon began to brighten with dawn.
A Global Skywatching Event
Total lunar eclipses occur when the Sun, Earth, and Moon align so that Earth’s shadow completely covers the Moon. During the March 3 event, the Moon spent nearly an hour fully inside the darkest part of Earth’s shadow, known as the umbra. During this phase, sunlight filtered through Earth’s atmosphere projected reddish light onto the Moon’s surface, creating the dramatic “blood moon” effect.
Astronomers noted that the event was particularly significant because total lunar eclipses are relatively infrequent. While partial eclipses occur more often, a full eclipse visible across large portions of the globe remains a memorable experience for both scientists and casual observers.
Scientists Explain the Phenomenon
According to researchers at NASA, the reddish color seen during totality occurs because Earth’s atmosphere scatters shorter wavelengths of sunlight — such as blue — while allowing longer red wavelengths to pass through. This filtered light is then bent, or refracted, into Earth’s shadow and projected onto the Moon.
Planetary scientists say lunar eclipses provide a powerful visual demonstration of the geometry of the Earth–Moon–Sun system. The curved shadow moving across the Moon also historically served as one of the earliest pieces of evidence that Earth is spherical.
Researchers also point out that lunar eclipses offer opportunities to study Earth’s atmosphere. Variations in dust, volcanic particles, and atmospheric conditions can influence how dark or red the Moon appears during totality.
Amateur Astronomers Share Their Views
While professional observatories monitored the eclipse with precision instruments, amateur astronomers and astrophotographers helped document the event from countless locations worldwide. Social media platforms and astronomy forums quickly filled with images showing the Moon’s color shifting from pale gray to orange and deep red.
Many skywatchers in the southwestern United States described the experience as particularly dramatic because the eclipse occurred just before moonset. Observers reported seeing the Moon glowing red above desert landscapes and city skylines before gradually fading into the brightening morning sky.
Astrophotographers also emphasized that lunar eclipses are among the easiest astronomical events to capture. Unlike solar eclipses, they can be photographed safely without special filters, making them accessible to beginners using smartphones as well as professionals using telescopes and high-end cameras.
A Rare Pre-Dawn Sight
In parts of the western United States, some observers were able to witness a rare atmospheric phenomenon known as a selenelion, when both the eclipsed Moon and the rising Sun appear in the sky at the same time due to atmospheric refraction. The effect added an unusual visual element to an already impressive celestial event.
The combination of a deep red Moon and the approaching dawn created striking photographic opportunities and memorable moments for early-morning skywatchers.
When Is the Next Total Lunar Eclipse?
Although partial eclipses occur periodically, the next widely visible total lunar eclipse will not occur until late 2028. That makes the March 2026 eclipse one of the most notable skywatching events of the decade.
For many observers, the event served as a reminder that some of the most spectacular astronomical experiences require nothing more than stepping outside, looking up, and taking a moment to appreciate the universe above.
References and Further Reading
- NASA – Lunar Eclipse Science Overview
- Time and Date – March 3, 2026 Total Lunar Eclipse Details
- Sky & Telescope – Astronomy News and Observing Guides
- Space.com – Guide to Lunar Eclipses
- STM Daily News – Science Coverage
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