Warm days, cold nights
Posted Nov27, 2006 at 03:45 PM
You may have noticed that even though the last couple of days have been unseasonably mild in the afternoon, the mornings have still been cold and frosty. Roanoke's low on Sunday was 32, and it fell to 35 this morning, before rebounding into the upper 60s each day. The atmosphere is extremely stable and dry right now, which allows for quick heating and loss of heating, depending on the sunlight or lack thereof. A more humid atmosphere warms and cools more slowly, as the water vapor absorbs heat more slowly but holds on to it longer. As the week progresses, the atmosphere will slowly moisten, so nighttime lows will gradually moderate as the warmup continues through at least Wednesday.
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