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- Thunderstorm (7337 bytes)
2: ...htning]] and its attendant [[thunder]]. It is often accompanied by copious rainfall, or, on occasion,...
4: ...pse rate]]; and a force such as mechanical convergence along a [[weather front|cold front]] that will ...
6: ...the [[Great Plains]] to explore the visual and scientific aspects of storms and tornadoes.
9: ...instability and relative wind conditions at different layers of the atmosphere ("[[wind shear]]"):
11: ...ghtning. Days with suitable weather conditions often see the repeated forming and dissipation of such ... - Tornado (14220 bytes)
3: ...number of incidences, the [[United States]] experiences more tornadoes than any other country, the [[U...
8: ...nd of [[mesocyclone]]s. On [[weather radar]] screens, a characteristic "[[hook echo]]" marks the area...
10: ...en they reach the ground. Why the rotation can intensify and form tornadoes is not understood.
14: ...ngs: over 80 percent of all tornadoes strike between noon and midnight.
16: ...visible at night, some nocturnal tornadoes have been observed glowing diffusely due to lightning activ... - Cirrus cloud (3505 bytes)
4: ...clouds-photo.jpg|thumb|250px|Wispy Cirrus clouds centre of image]]
5: [[Image:Clouds-cirrus-filaments.jpg|thumb|250px|Cirrus clouds]]
9: ...of [[ice]] crystals and shaped like hairlike filaments. They are formed at an altitudes above 16,500 f...
11: ...anus, and possibly Neptune. They have even been seen on Titan, one of Saturn's moons. Some of these ex...
15: ...s into ice. They sometimes may be caused by turbulence and wind shear, or by upper-tropospheric convec... - Weather front (4296 bytes)
1: ...ology]], a '''weather front''' is a boundary between two [[air mass]]es with differing characteristics...
3: ...d and direction, [[atmospheric pressure]], and often a change in the [[Precipitation_(meteorology)|pre...
5: ... stream]] and travel from west to east. This movement is due to the [[Coriolis effect]], caused by the...
9: ...and cooler, drier weather as the front passes. Depending on the time of year and geographic location, ...
13: ...nd are associated with less severe weather. They gently settle over the cold front and move it out of ... - Derecho (3909 bytes)
6: ... may die and redevelop. Winds in a derecho can be enhanced by [[downburst]] clusters embedded inside t...
8: ... to occur in other parts of the world. One such event occurred on [[July 10]], [[2002]] in [[Germany]]...
13: ...recho - Multiple bow echoes embedded in a massive squall line typically around 250 miles (400 km) long. Th...
17: ...os. An example is the one that moved through the central Northern Plains and the Southern Great Lakes ...
19: ...f at least 50 knots (58 mph or 93 km/h) along the entire derecho. - Cumulonimbus (3980 bytes)
1: ...oma. The updraft is the large cloud mass at the center of the photo. The anvil is the flat layer at ...
3: ...s, or along a [[weather front|cold front]] in a [[squall]] line.
7: ...reate a cumulonimbus cloud, you need three ingredients.
8: # Plenty of moisture.
10: # A source of energy to lift the warm, moist air mass rapidly upwa...
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