| Fog climatology at Spokane, Washington - :14486 | National Weather Service (NWS)
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Fog climatology at Spokane, Washington
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    Fog climatology at Spokane, Washington is established to aid in the preparation of terminal aviation forecasts. Two software applications correlate specific surface weather to jog for parameters five winters of hourly surface observations. The programs only consider data when the spread between the temperature and dewpoint temperatures is 2 oF or less. FOGGEG produces graphical outputs for fog probability versus temperature, wind speed, wind direction, barometric pressure, and time of day. FCSTFOG provides conditional probabilities of fog for LIFR, IFR, and MVFR conditions. Fog and dense fog are most likely to occur under calm winds. For wind speeds under 11 kts, the most favorable wind direction is from the northeast. For wind speeds greater than 11 knots, the preferred direction is south or southwest. Fog rarely forms with a northwest wind. When temperatures are around 5°F, dense fog is possible with a dewpoint depression of 3 or 4°F. In this instance, the atmosphere is saturated with respect to ice, not water.

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