Environmental issues in the Philippines saw its average temperature rise by 0.65 degrees Celsius, with fewer recorded cold nights and more hot days. Since the 1970s, the number of typhoons during the "El Niño" season has increased. The Philippines has not only seen 0.15 meters of sea level rise since 1940, but also seen 0.6 to 1 degree Celsius increase in sea surface temperatures since 1910, and 0.09 degree c increase in ocean temperatures since 1950. During the time period from 1990 to 2006, the Philippines experienced a number of record-breaking weather events, including the strongest typhoon (wind speeds), the most destructive typhoons (damages), the
Significant weather advisory broadcast television stations have begun including significant weather advisories into their systems, however, these systems usually classify such an advisory terms such as "Heavy T-Storms", "Heavy Storms" or "Strong T-Storms" (terms used by the system prior to the inclusion of the product). The National Weather Service in the United States issues a significant weather advisory for strong thunderstorms (and occasionally, other weather situations such as downbursts) that may pose limited to no threat to life and property; it is typically issued if the hail size in a thunderstorm is one-half to one inch in diameter, and/or winds of 35 to