December 21st, 2025 Timelapse
On December 21st, morning conditions began with a steady, overcast sky, where clouds blanketed the area at nearly 100% coverage. The temperature hovered around a cool 41.9°F, and at the surface level, winds were gentle, averaging 6.9 mph. However, as we looked higher into the atmosphere, the wind at 100 meters soared to an average of 15.7 mph, creating a noticeable contrast. This difference led to a mild turbulence as the stronger winds aloft began to move the thick layers of low clouds, which constituted about 27.7% of the cloud cover, while mid-level clouds made up 22.0%. The high clouds, which completely enveloped the sky, contributed to the heavy, gray veil that seemed to press down, suggesting a potential for light rain. The turbulent interaction between the lower surface winds and stronger winds above resulted in a dynamic cloud movement, with low clouds occasionally shifting in response to the higher winds, creating a captivating visual effect.
As midday approached, the weather continued to evolve, with a slight rise in temperature to about 43.5°F and a minor decrease in surface wind speed to an average of 5.8 mph. The cloud cover remained impressively dense, with 99.8% overall coverage; however, the composition shifted as low clouds now constituted 66.2% of the total. Mid-level clouds increased significantly, reaching 99.8%, while high clouds receded completely. This distribution of clouds was likely influenced by the altered wind patterns, as the average winds at 100 meters decreased to 11.4 mph, which was still strong enough to create mild turbulence. The interplay between the layers resulted in a mesmerizing scene, where lower clouds formed a thick, textured layer while the faster-moving mid-level clouds raced along, casting shadows over the landscape. Light precipitation began to fall, totaling 0.06 inches, as the moisture-laden air generated by the low and mid-level clouds was finally released.
In the evening, the temperature began to dip slightly to around 42.7°F as the sun set, casting a soft glow through the thinning cloud cover. The surface wind picked up slightly to an average of 7.0 mph, while winds aloft at 100 meters increased to 13.9 mph. Although overall cloud cover decreased to 89.0%, low clouds still made up 61.0% of the sky, and mid-level clouds remained at 75.0%. The absence of high clouds allowed for a clearer view of the layered structure created by the differing wind speeds. The turbulence persisted, particularly where the lower winds conflicted with those above, causing rippling effects in the clouds. As the day drew to a close, the atmosphere maintained a sense of dynamic energy, with the layering and shifting of clouds creating a complex and beautiful canvas overhead, illustrating the dramatic interactions between the surface and aloft winds through the day.
December 21st, 2025 Timeline
Screenshots with weather data (wind layers, clouds, precipitation)
Weather Info for December 21st, 2025
Sunset: 4:29 PM