1. Moist Air Rises: When moist air from the prevailing wind encounters a mountain range, it is forced to rise.
2. Cooling and Condensation: As the air rises, it cools due to lower atmospheric pressure at higher altitudes. This cooling causes the water vapor in the air to condense, forming clouds.
3. Precipitation: As the air continues to rise and cool, the condensation intensifies, leading to the formation of precipitation. The windward side of the mountain receives the bulk of this precipitation.
4. Dry Air on the Leeward Side: The air that has now lost much of its moisture descends on the leeward side of the mountain. This descending air is warmed by compression, further reducing its capacity to hold moisture, resulting in a rain shadow effect with little to no precipitation.
In short: The orographic effect creates a pattern of heavy precipitation on the windward side of mountains and dry conditions on the leeward side.
Here's an analogy: Imagine blowing air through a straw. The air coming out of the straw is fast and powerful. Now imagine putting your finger over the end of the straw. The air still comes out, but it's slower and weaker because it has to go around your finger. This is similar to what happens when air hits a mountain. The air has to slow down and rise up over the mountain, and this causes it to cool and release its moisture as precipitation.
