Name: class: date: exercise 3.2-contouring weather maps rules for contouring . contour lines are drawn to identify constant values of an atmospheric variable. a contour is drawn through the station location only if the data for that station has the exact value of the contour; otherwise the contour is drawn bebween stations hilgher values are on one side of the contour and lower values on the other side. contours never cross or touch each other. more than one contour of a given value may appear on a given map. all contour lines must be clearly labeled. contours always form closed loops on world maps. contours are drawn at equal increments of the contoured variable. typically at intervals of: 5 or 10 °f(°c) for isotherms (temperature) and isodrosotherms (dewpoint temperature), 4 mb for isobars (pressure) and 5 kts for isotachs (wind). shown below is a map of the southeastern united states with temperatures reported at a number of stations. contour the map at 5 degree intervals starting at 40°f 39 一40. 41 74 40 45 80 51 80 75 80 80 80 51 81 63 51 84 75 83 81 85 85