Hello there!
The general atmospheric conditions behind a cold front is that the air behind the cold front is cool and dry.
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(Says I have to cite my sources so here goes: I just copy/pasted your question into Google lol)
Plain - flat or Rolling Land with few changes in elevation
Most El Nino climate patterns involve the Earth's atmosphere and the surface waters of the the Pacific Ocean<span>. El Nino is a climate cycle in the Pacific Ocean with a global impact on weather patterns. The cycle begins when warm water in the western tropical Pacific Ocean shifts eastward along the equator toward the coast of South America. Normally this warm water pools near Indonesia and the Philippines. During an El Nino, the Pacific's warmest surface waters sit offshore of northwestern South America. </span>
<span> Northwest Territories, the Yukon, and the Nunavut.
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