September 13th, 2026 Timelapse
On September 13th, the day began under a blanket of thick cloud cover, with conditions that felt distinctly cool and damp at an average temperature of 51.8°F. Surface winds were gentle, averaging just 5.6 mph, but at 100 meters aloft, winds picked up quite a bit to 9.2 mph, creating a noticeable gradient between the two layers. This difference in wind speed contributed to a rich tapestry of clouds, as low clouds comprised 44.5% of the sky while mid and high clouds filled in the remaining 99.8% and 94.0%, respectively. The morning featured a light drizzle, with a total precipitation of 0.01 inches. The turbulence between the slower surface winds and the stronger upper-level winds resulted in a churning atmosphere, causing the thick clouds to shift subtly, but they remained largely stationary throughout the morning.
As the day progressed toward midday, the temperature rose to a milder 56.7°F. Winds at the surface slightly decreased to an average of 4.5 mph, while the 100-meter winds slowed to 7.0 mph, continuing to create a distinct shear effect. Cloud cover remained consistently dense at 100%, now with 40.5% low clouds and a complete 100% of mid-level clouds, while the high clouds thinned out to 71%. The mid-layer clouds, now buoyed by the steadier upper winds, began to drift more rapidly across the sky, creating dynamic shapes and shadows that played off the cooler, thicker low clouds below. Light rain continued to fall, with total precipitation increasing to 0.13 inches. The contrasting speeds of the cloud layers produced an intricate visual dance, where mid-level clouds flowed swiftly while the lower clouds clung close to the ground, adding to the overall atmospheric tension.
In the evening, the atmosphere began to settle with temperatures reaching up to 59.8°F. Surface winds picked up slightly to an average of 5.4 mph, while the winds aloft at 100 meters increased again to 9.8 mph, reinforcing the shearing effect that had characterized the day. Cloud cover diminished to an average of 68.7%, with low and mid-level clouds receding to 30.5% and 39.8%, while high clouds stabilized at 41.3%. This shift in cloud dynamics created a more layered appearance in the sky, where remnants of the earlier dense cloud cover began to break apart, allowing for brief glimpses of the blue sky. The evening brought a light sprinkle, contributing an additional 0.02 inches to the day's total of 0.20 inches. The gentle turbulence previously observed now seemed to settle into a calm rhythm, as the clouds slowly drifted apart, with the day concluding on a more tranquil note, a welcome change after a day of steady moisture and movement.
September 13th, 2026 Timeline
Screenshots with weather data (wind layers, clouds, precipitation)
Weather Info for September 13th, 2026
Sunset: 7:26 PM