Tuesday, October 05, 2010
Big Temperature Gap Over 1 Mile!
This is a different phenomenon though. We had a radiational inversion with clear skies and calm winds. This prevented any mixing of the winds, the heat from the day radiated out into the atmosphere, and the colder (more dense) air pooled into the valley. This is the same reason we often see fog in the valleys.
Below is the NAM model for midnight last night. This is a skew T which shows the temperature and dewpoint as you go UP through the atmosphere. If you notice, the air is much colder near the surface than it is slightly above the ground... yet as you go up, the temperature (red line) starts dropping again. That's why it's colder on top of a mountain! (That's another subject though)...
So, if you live along Highway 358... in the area that ALWAYS drops phone calls, you were about 10 degrees colder than the higher points on the highway last night!
Have a great day!
Posted By: Ryan at 1:57 PM