Heat waves are periods of abnormally high temperatures and heat index. Definitions of a heatwave vary because of the variation of temperatures in different geographic locations. Excessive heat is often accompanied by high levels of humidity, but can also be catastrophically dry.
heat WaVes aRE PeriodS of AbNormally high tEmperatures ANd heAt indEx. DeFiniTiONs Of A hEaTWAve vary becAuse of The vARIatIoN of TEMperatuRES in difFerent gEOgraphic loCaTions. eXcessIve HeAt Is often accoMPaNiEd by High levElS OF humidity, but caN alsO be CaTAstroPHiCally dry.