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Cortland County hill landscape in Autumn season Royalty Free Stock Photo
Sunrise through valley fog in Virgil Greek Peak NYS Royalty Free Stock Photo
Morning daybreak appears over foggy central NYS hills Royalty Free Stock Photo
Row of Red Maple trees line a FingerLakes hillside in Autumn Royalty Free Stock Photo
Cattle pasture in early morning fog background in Dryden NewYorkState Royalty Free Stock Photo
Winter snow rock wall foundation village timesquare Dryden NYS Royalty Free Stock Photo
Sun at daybreak through heavy valley fog with power lines visible in NewYorkState Royalty Free Stock Photo
Morning sun shrouded in misty mountain fog
Daybreak over a cattle pasture with valley fog in Dryden NewYorkState Royalty Free Stock Photo
Foggy daybreak arrives in CentralNewYork with Greek Peak ski Mt in distance Royalty Free Stock Photo
Cortland County NYS rolling hills of Autumn tree colors with row of red Maple trees Royalty Free Stock Photo
Early morning blue sky over fog covered valleys in upstate NewYork September Royalty Free Stock Photo
Sun filtered through valley fog and power lines in September in NYS FingerLakes Royalty Free Stock Photo
Planet Venus visible in eastern sunrise sky over FingerLakes cornfield in NYS Royalty Free Stock Photo
Orange clouds with approaching sunrise over farm with valley fog in Virgil NYS Royalty Free Stock Photo
Thick fog obscured the sunrise in late September. Overnight or morning fog, such as valley fog, is primarily caused by the cooling of the ground, which releases heat back into the air, leading to the formation of cooler, denser air near the ground. This phenomenon, known as "cold air drainage," causes the valley to fill with cold air, which lowers the surrounding air temperatures closer to the dew point and saturation. If there is sufficient moisture in the air, fog will begin to form as the night progresses. This type of fog is most commonly observed in the autumn and spring months, particularly around sunrise when surface temperatures are often lowest.


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