Sling Psychrometer- A psychrometer in which the wet and dry bulb thermometers are mounted upon a frame connected to a handle. The psychrometer may be whirled by hand in order to provided the necessary ventilation.
Snow Pellets- Precipitation of white, opaque grains of ice. The grains are round or sometimes conical. Diameters range from about 0.08 to 0.2 inch (2 to 5 mm).
Station Pressure- The pressure that is read from a barometer but is not adjusted to sea level.
Surface Pressure- The pressure that is read from a barometer but is not adjusted to sea level.
Satellite Photo- A photograph of the earth taken by weather satellites that shows areas of cloud.
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