Because of the considerable distance between weather observationstations, important weather phenomena can be present without beingreported. Observation platforms are much more sparse over the oceans,resulting in more weather hazards being unreported, and thus unknown. Fog is one of those hazards. However, research in satellite meteorologyhas shown that satellite imagery can be useful in detecting fogin the large areas where there are no observation platforms. TheFog Monitor is an AWIPS decision assistance tool engineered to continuouslymonitor satellite imagery for fog. It automatically alerts the WFOwhen probable fog is detected. The Fog Monitor provides a satellite-image-like display with pixelscolored to indicate whether the location is probably fog-free, maybefog-covered, or probably fog-covered. The Fog Monitor also providesthe WFO the ability to customize the thresholds used to recognizeand distinguish fog. This facilitates research by the WFO and allowsto WFO to adapt the Fog Monitor to the season and to its local conditions.