The spring equinox occurs every March 19, 20 or 21 in the Northern Hemisphere. Here's what happens during the celestial event ...

Milwaukee is finally beginning to defrost with high temperatures this week. When does spring officially begin?

Definition of Lightning Hotspots Lightning hotspots are fascinating regions around the world where lightning strikes are ...

(This area is also called the equator.) If you estimate that a day is 24 hours long, you divide the circumference by the length of the day. This produces a speed at the equator of about 1,037 mph ...

La Niña describes the opposite effect: The temperature of the Pacific Ocean near the equator drops, often stymieing development of such storms. NOAA says La Nina ocean cooling has finally arrived ...