D all of these create a magnetic field. let me know if you want me to explain.
Answer:
Current Air Temperature
The current air temperature plotted to the nearest whole degree Fahrenheit.
Dew Point Temperature
The dew point temperature plotted to the nearest whole degree Fahrenheit.
Sky Cover
The total amount of clouds in tenth. Plotted in the station circle according the the following table.
Wind Speed And Direction
The wind direction is plotted as the shaft of an arrow extending from the station circle toward the direction from which the wind is blowing. The wind speed is plotted as feathers and half-feathers representing 10 and 5 knots, on the shaft on the wind direction arrow. See the following table.
Visibility
The visibility plotted in fractions of a mile. For values above 10 miles, the values are omitted from the map.
Sea Level Pressure
The barometric pressure in tenths of millibars reduced to sea level. The initial 9 or 10 and the decimal points are omitted.
ex: plotted = 982, actual = 998.2 mb
ex: plotted = 012, actual = 1001.2 mb
Pressure Tendency
The pressure change in the past 3 hours preceding the observation. Plotted to the nearest tenth of a millibar. The plotted symbol characterizes the change in pressure according to the below chart.
