How Fishing Forecasts Work: Weather, Pressure and Solunar

Anglers quote absolute pressure readings, but the direction of change is what correlates with feeding. A falling barometer ahead of a front is widely regarded as the best window — fish often feed hard in the hours before weather arrives. Steady high pressure after a front typically produces the toughest fishing, with fish holding tight to cover and requiring slower presentations.

• Falling — often the most active feeding window
• Steady — predictable, average conditions
• Rising after a front — usually the hardest bite; fish slow and deep

Fish are cold-blooded, so water temperature sets their metabolism and therefore how often they need to eat. Each species has a range in which it is most active, and temperature is also what triggers seasonal movements — the pre-spawn migration shallow, the summer retreat to thermoclines, the autumn feed. A three-degree change over a few days often matters more than the absolute reading.

A light chop breaks up the surface, reduces how well fish can see you, and pushes plankton — and therefore baitfish — against a windward bank. Wind-blown shorelines are frequently the most productive water on a lake. Cloud cover has a similar effect: overcast days spread fish out and extend the active window, while bright, flat calm conditions concentrate them in shade and depth.

Solunar tables predict feeding activity from the position of the sun and moon. Major periods, roughly two hours long, occur when the moon is directly overhead or underfoot; minor periods, around an hour, occur at moonrise and moonset. New and full moons amplify them.

Solunar timing is best treated as a tiebreaker rather than a rule: when a major period overlaps dawn or dusk and the barometer is falling, that is the window worth planning your day around.

A useful forecast combines these into a single number per window rather than making you reconcile five separate readings. FishFactor scores the morning and evening windows from 0 to 100 for your exact coordinates, weighing live weather, pressure trend, wind, cloud cover, moon phase and solunar periods.

• Use the score to choose between two windows, not to decide whether to fish at all
• Log the conditions with every catch so you can check the forecast against your own results
• Over a season, your own log will tell you which factors matter most on your water