High pressure, large and in-charge is situated over the mid-Atlantic and continues to control the weather. High pressure typically has fair weather as it brings sinking air motion. The makes it difficult for clouds to develop. So we are left with clear skies both at night and during the day. Cold temperatures at night are common with high pressure systems. This is because of the clear skies and calm winds that occur during the night. The calm winds allow the atmosphere from being mixed and the clear skies allow the daytime heating to escape right back up into the atmosphere. This process is called evaporational cooling and last night and tonight are prime examples.
The low this morning in Salisbury bottomed out at 25 degrees, tying the record low for the date. Many areas saw sub-freezing temperatures last night so a freeze warning was needed. Tonight's lows should not be as cold, but there could be some upper 20's, especially around the Salisbury Airport. Areas of frost are also possible in the inland locations since frost is possible with temperatures in the mid 30s.
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