The Enhanced Fujita Scale is used to assign tornadoes a rating based on estimated wind speeds and damage.
The EF Scale became operational on Feb. 1, 2007. It was revised from the original Fujita Scale, developed in 1971 by Tetsuya Fujita, to better reflect wind speed with damage observed in tornado surveys.
Deadly Severe Weather Facts & Safety Tips:
The temblor occurred at 9:07 a.m. local time (9:07 p.m. EDT Thursday). The quake had a depth of 10 km (6.2 miles), the China Earthquake Networks Center (CENC) reported.
Thundery showers late on Friday and on Friday night will pose a threat of localized torrential rain, high winds and hail.
After intense heat eased some for Thursday, it will once again bake Spain and France to close out this week and expand into Germany and Poland this weekend.
The same front that brought gusty thunderstorms and tornado reports across Missouri Wednesday will once again spark severe weather from the Plains to the Tennessee Valley into Thursday night and beyond.
While parts of India received torrential rainfall during June, impact from El Nino will reassert itself over the upper part of the Indian Ocean and Southeast Asia.
Winds and the Gulf Stream current are the likely catalysts behind strange jellyfishlike creatures, Man O' War, popping up on East Coast beaches over the past several weeks.
Baltimore, MD (airport) (1966)
102 degrees, tied all time record high.
Berks County, PA (1973)
Third flood in 12 days. Southwestern Berks Co. hardest hit with rains well over 4" within 3 hours. Route 222 washed out near Adamstown "worse than Agnes." Flooding along Wyomissing Creek. One actual measurement was over 6".
Philadelphia, PA (1978)
A total of 3.66 inches of rain.