Friday, December 22, 2017

Ground and Sky Thermal Observations for NearSys Station, 22 December 2017

According to readings from the Seek Reveal, the ground temperature was 13 degrees F. Below are two images of the sky recorded at 4:30 PM MST and 5:15 PM MST. Snowfall began shortly before the second image was recorded.
At 4:30 PM, the stratus clouds over NearSys Station were 9 degrees colder than the ground. Assuming a dry adiobatic lapse rate of 5.4 degrees per thousand feet, the clouds were 1,600 feet above NearSys Station.

Forty-five minutes later, the clouds were 5 degrees warmer. Therefore, the cloud height deceased to 700 feet above NearSys Station. That's a decrease of 900 feet in 45 minutes or 20 feet per minute. Is it normal for clouds to decrease their height before precipitation begins? More testing is called for.

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