To see an analysis of surface temperature and dewpoint based on these plots click here . When successive surface charts are produced during a shift we can track weather systems moving across the country, moisture moving northward that can indicate a better chance of precipitation, or rapid pressure falls that can signify a developing surface low. Examination and analysis of good, reliable surface observations is a crucial first step for any meteorologist to prepare a forecast. In order to forecast what will happen we must first get a good grasp on what is happening now. The high density of ASOS units and frequent reports of surface observations supply the forecaster with a wealth of information to help in making that diagnosis.
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