Increased rainfall and longer daylight hours trigger photosynthesis, turning brown landscapes into vibrant shades of emerald.

Spring is the transitional season between winter's cold and summer's heat. Its defining characteristic is —weather can shift dramatically from warm and sunny to cold, rainy, or even snowy within a single day.

The polar jet stream, a river of strong winds at 30,000–40,000 feet, weakens but becomes wavier in spring. Instead of a smooth west-to-east flow, it develops deep troughs (dips) and ridges (bulges). A trough allows Arctic air to plunge south; a ridge allows tropical air to surge north. These sharp contrasts generate intense low-pressure systems.

: Defined by Earth's position relative to the sun. It begins on the Vernal Equinox (around March 20 or 21 in the Northern Hemisphere) when day and night are nearly equal in length.