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A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. Troughs may be at the surface, or aloft, at ...
In the meantime, moist air from the Gulf of Mexico moved into the Midwestern United States through the Mississippi River valley as a second Canadian high-pressure system arrived from the west, creating a low-pressure trough that stretched from southern Illinois, across central Indiana, and into northern Ohio. At least two low-pressure systems ...
A popular type of surface weather map is the surface weather analysis, which plots isobars to depict areas of high pressure and low pressure. Cloud codes are translated into symbols and plotted on these maps along with other meteorological data that are included in synoptic reports sent by professionally trained observers.
The fifth tropical or subtropical cyclone and third named storm of the 1982 Atlantic hurricane season, Chris developed from a surface low-pressure area in the northern Gulf of Mexico on September 9. Although initially displaying subtropical characteristics, the low pressure area gradually acquired tropical characteristics, and was reclassified ...
A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.
The storm was brought about by a historic storm that went from an innocuous low-pressure trough to tying the strongest storm ever recorded in that part of the Pacific Ocean. Measurements showed ...
A surface weather analysis for the United States on October 21, 2006. By that time, Tropical Storm Paul was active (Paul later became a hurricane). Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations.
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