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| | | #REDIRECT: [[Surface chart]] |
| #REDIRECT [[surface chart]] | |
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| == surface chart ==
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| <div class="definition"><div class="short_definition">(''Also called'' surface map, sea level chart, sea level pressure chart.) An [[analyzed chart]] of [[surface weather observations]].</div><br/> <div class="paragraph">Essentially, a surface chart shows the distribution of [[sea level pressure]], including the positions of [[highs]], [[lows]], [[ridges]], and [[troughs]] and the location and character of [[fronts]] and various boundaries such as [[drylines]], [[outflow boundaries]], [[sea-breeze fronts]], and [[convergence lines]]. Often added to this are [[symbols]] of occurring weather phenomena, [[analysis]] of [[pressure tendency]] (isallobars), indications of the movement of [[pressure systems]] and fronts, and perhaps others, depending upon the intended use of the chart. Although the [[pressure]] is referred to [[mean sea level]], all other elements on this chart are presented as they occur at the surface point of [[observation]]. A chart in this general form is the one commonly referred to as the weather map. When the surface chart is used in conjunction with [[constant-pressure charts]] of the [[upper atmosphere]] (e.g., in [[differential analysis]]), sea level pressure is usually converted to the height of the 1000-mb surface. The chart is then usually called the 1000-mb chart.</div><br/> </div>
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