Many Fisheries biologists attribute heavy feeding activity before a weather front and less after the front has passed to the fact that as the front passes it causes barometric pressure changes upsetting the fishes' air bladder.
When a fishes' air bladder isn't feeling right it won't want to eat. Changes in pressure can give fish a full feeling. Temperature changes, winds and rains, (storms) the changing water condition all add up to make feeding more difficult. The bottom line is that the weather effects the behavior and feeding activity of fish.
Understanding the intensity and origin of a weather front is a key in predicting fishing. Weather Fronts cause changes in Barometric Pressure, Temperature, Directions and Speed of winds and light penetration on a body of water.
There are 3 types of Weather Fronts:Cold Fronts: The passing of a Cold fronts has the biggest negative effect on fishing. As a cold front passes, the temperature and humidity fall and air pressure begins to rise. The first day after a cold front passes the fish feeding activates are short duration. The fish bury up in the heavy cover or go deep and are sluggish at best. With each day the fish movement will get better, Feeding will be best with the return of some cloud cover. Cold fronts affect some waters differently than others. A Cold front can have much more influence on a clear lake than a stained or muddy one, yet a lake can be much more affected than moving water or a river or creek. Tributaries with a current flow are considerably less susceptible to drastic changes, than still water. By the third day with constant weather the fish will return to normal movements.
Warm Fronts:The passing of a warm front often implies that inclement weather is approaching and air pressures may fall. Many people think of warm fronts as fish catching fronts. Cloudy weather, steady barometer, south to west winds are good conditions. These conditions will trigger longer feeding activities of fish. Fish will move out from under the heavy cover, the deep open water fish will move to points, humps even to the shallows to feed. If water temperatures are a close match too air temperature these are good top water days.
After three days of constant weather the fish will start to become accustom to the conditions and return to a normal activity.