Sunday, June 15, 2008

A return to seasonal temperatures this week

**Flash Flood Warning This morning until 10:30 for Fayetteville, Cumberland county**

Partly to mostly cloudy with a chance of showers and thunderstorms, especially south and east of the Triangle.
Highs in the upper 80s.
Cloudy with storms ending tonight.
Lows near 70. Variable clouds Monday with a chance for showers and storms later in the day. Highs near 90.

This week our weather pattern changes. I'm sure you remember the triple-digit heat we had just recently. That was due to a ridge of high pressure not only at the surface, but at higher levels of the atmosphere. That was a perfect pattern for a heat wave as not only did downward-moving air compress and heat up, but upper-level ridges mean that cooler air masses are kept at bay. We have been in a transition pattern, and will see a cooler pattern this coming week as a surface cold front brings more seasonal temperatures (mid to upper 80s are the 'normal' highs for this week). This will be accompanied by an upper level trough which will support these temperatures and perhaps keep a cloud or two overhead from time to time.

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