Editing Surface weather analysis (section)

== Station model used on weather maps ==
{{see also|Station model}}
[[Image:Station model.gif|thumb|[[Station model]] plotted on surface weather analyses]]

When analyzing a weather map, a station model is plotted at each point of observation. Within the station model, the temperature, dewpoint, [[wind speed]] and [[Wind direction|direction]], atmospheric pressure, pressure tendency, and ongoing weather are plotted.<ref>National Weather Service. [http://www.srh.noaa.gov/ohx/educate/station_model.gif Station Model Example.] Retrieved on 2007-04-29. {{webarchive |url=https://web.archive.org/web/20071025135958/http://www.srh.noaa.gov/ohx/educate/station_model.gif |date=October 25, 2007 }}</ref> The circle in the middle represents cloud cover; fraction it is filled in represents the degree of [[overcast]].<ref>Dr Elizabeth R. Tuttle. [http://www.du.edu/~etuttle/weather/weather.htm Weather Maps.] {{webarchive|url=https://web.archive.org/web/20080709005941/http://www.du.edu/~etuttle/weather/weather.htm |date=2008-07-09 }} Retrieved on 2007-05-10.</ref> Outside the United States, temperature and dewpoint are plotted in degrees [[Celsius]]. The [[wind barb]] points in the direction from which the wind is coming. Each full flag on the wind barb represents {{convert|10|kn|km/h|0}} of wind, each half flag represents {{convert|5|kn|km/h|0}}. When winds reach {{convert|50|kn|km/h|0}}, a filled in triangle is used for each {{convert|50|kn|km/h|0}} of wind.<ref>American Meteorological Society. [http://www.ametsoc.org/amsedu/dstreme/extras/wxsym2.html Selected DataStreme Atmosphere Weather Map Symbols.] Retrieved on 2007-05-10.</ref> In the United States, rainfall plotted in the corner of the station model are in [[inch]]es. The international standard rainfall measurement unit is the [[millimeter]]. Once a map has a field of station models plotted, the analyzing [[isobar (meteorology)|isobars]] (lines of equal pressure), isallobars (lines of equal pressure change), isotherms (lines of equal temperature), and [[isotach]]s (lines of equal wind speed) are drawn.<ref>CoCoRAHS. [http://ccc.atmos.colostate.edu/~hail/teachers/lessons/isopleths.htm INTRODUCTION TO DRAWING ISOPLETHS.] Retrieved on 2007-04-29. {{webarchive |url=https://web.archive.org/web/20070428172620/http://ccc.atmos.colostate.edu/~hail/teachers/lessons/isopleths.htm |date=April 28, 2007 }}</ref> The abstract weather symbols were devised to take up the least room possible on weather maps.{{Citation needed|date=December 2021}}