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In meteorology, convective available potential energy (CAPE) is the amount of energy a parcel of air would have if lifted a certain distance vertically through the atmosphere. CAPE is measured in joules per kilogram of air (J/kg). Any value greater than 0J/kg indicates instability, and the possibility of thunderstorms. Air is a name for the mixture of gases present in the Earths atmosphere. ...
The joule (symbol J, also called newton meter, watt second, or coulomb volt) is the SI unit of energy and work. ...
The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ...
Thunderstorms form when air parcels are lifts vertically. The atmosphere is warm at the surface, but turns substantially cooler with height. As the air is cooling more slowly than the surrounding atmosphere as it is lifted, it is relatively less dense, and so continues to rise through the atmosphere until it reaches an area of air wamer than itself. A roll cloud associated with a heavy or severe thunderstorm over Enschede, The Netherlands. ...
An air parcel is an imaginary chunk of air in the atmosphere. ...
Atmosphere may refer to: a celestial body atmosphere, e. ...
CAPE for a given area is measured on a sounding diagram called a skew-T thermodynamic diagram. A Skew-T Log-P diagram is a thermodynamic diagram commonly used in weather analysis and forecasting. ...
An extreme day for severe weather sees CAPE values over 5,000 J/kg. Two hours before the Oklahoma Tornado Outbreak occurred on May 3, 1999, the CAPE value sounding at Oklahoma City was at 5,885 J/kg. A few hours later, an F5 tornado ripped through the southern suburbs of the city. The Oklahoma Tornado Outbreak is the May 3, 1999 tornado event that killed 46 people. ...
May 3 is the 123rd day of the year in the Gregorian calendar (124th in leap years). ...
1999 is a common year starting on Friday of the Common Era, and was designated the International Year of Older Persons by the United Nations. ...
Downtown Oklahoma City The State Capitol of Oklahoma Oklahoma City is the capital and largest city of the state of Oklahoma in the United States of America. ...
The Fujita scale rates a tornados intensity by the damage it inflicts on human-built structures. ...
Severe weather and tornadoes can develop in an area of relatively low CAPE values. The surprise severe weather event that occurred in Illinois on April 20, 2004 is a good example. State nickname: Land of Lincoln, The Prairie State Other U.S. States Capital Springfield Largest city Chicago Governor Rod Blagojevich Official languages English Area 149,998 km² (25th) - Land 143,968 km² - Water 6,030 km² (4. ...
April 20 is the 110th day of the year in the Gregorian calendar (111th in leap years). ...
2004 is a leap year starting on Thursday of the Gregorian calendar. ...
See also
Convective inhibition (CIN or CINH) is a meteorlogic parameter that measures the amount of energy that will prevent an air parcel from rising from the surface to the level of free convection. ...
A roll cloud associated with a heavy or severe thunderstorm over Enschede, The Netherlands. ...
These are some famous tornadoes and tornado outbreaks that have occurred in North America over the past few centuries. ...
Composite satellite image showing the progress of a hurricane weather system approaching the east coast of America Weather comprises all the various phenomena that occur in the atmosphere of a planet. ...
External links - Gives basic definition of CAPE
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