NEW YORK (WABC) -- A summer heat wave is once gain upon us, with temperatures soaring into the 90s and real-feels in the triple digits. But what is a heat wave? What defines one, and how does it form?

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, ...

As the early surf pioneers began to observe, and as advances in more recent wave forecasting has confirmed, there are a few ...

A third tropical wave has formed in the Atlantic near Africa & while its chances of strengthening remain low, the other two systems are forecast to turn into tropical depressions this week, National ...

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, ...

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, ...