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Dry lines
Dry lines are boundaries that separate the moist
air mass from the dry air mass. Severe thunderstorms may form along or
just to the east of drylines. Dry lines are typically found east of the
Rocky Mountains. Dew point temperatures may drop by as much as 16 degrees
F along a dry line. Along a cold front, in the warm sector where moist
air encounters dry air, convergence and lifting can occur--the drier air
behind the dry line lifts the moist air ahead of it. Thunderstorm
development is thus triggered. It is fairly common for supercells
to develop along dry lines. In Texas, tornadoes sometimes are created
due to the uplifting caused by the outflowing cold air. |
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