December 13, 2025 - Cloudy Pacific Northwest Skyscape Timelapse Video | 4K 60fps

On December 13th, the morning in the Pacific Northwest began under a blanket of low clouds, with cloud cover averaging around 40.7%. The surface wind was relatively gentle, averaging about 4.8 mph, while winds at 100 meters climbed to 9.3 mph, creating a notable contrast between the two layers. This difference contributed to some turbulence in the lower atmosphere as the stronger winds aloft pushed the low cloud layer, causing it to drift steadily across the sky. The temperature was cool, averaging 47.3°F, and the overall lack of mid-level and high clouds lent a muted quality to the morning light, though patches of blue peeked through the low cloud layer here and there. As the day progressed into midday, the cloud cover increased slightly to 45.8%, with a notable shift as high clouds began to emerge, covering approximately 38.8% of the sky. The surface wind settled down a bit to an average of 4.5 mph, while the winds aloft at 100 meters decreased to 7.7 mph. This reduction in wind speed aloft allowed the low clouds to become somewhat more stable, giving the sky a softer appearance. The high clouds moved quickly, driven by the westerly flow at higher altitudes, creating a layered effect that added depth to the sky. The overall stability at lower levels and brisker winds above led to a subtle interplay of cloud dynamics, but there was no precipitation to accompany these developments, keeping the atmosphere relatively dry. This captivating weather scene unfolds beautifully in stunning 4K Ultra HD at 60fps, showcasing the intricate details of the clouds and sky. In the evening, cloud cover reached a complete 100%, dominated entirely by high clouds, while low clouds were virtually nonexistent. The surface wind picked up slightly to an average of 5.7 mph, yet the winds at 100 meters increased more significantly to 13.0 mph, exacerbating the wind shear between the two layers. This conflict created a more turbulent atmosphere, as the lower layer struggled against the stronger upper winds, causing the high clouds to billow and shift dramatically against the backdrop of the setting sun. The temperature cooled slightly to an average of 53.1°F, allowing the clouds to take on a more vibrant palette of colors. The day concluded with a spectacular display of ever-changing cloud patterns, sculpted by the dynamic interactions of wind at different altitudes, leaving behind a richly textured sky as nightfall approached.

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