The phrase "able to predict when" is correct and usable in written English.
You can use it when discussing the capability to foresee a specific event or occurrence in the future.
Example: "Scientists are now able to predict when a volcanic eruption might occur based on seismic activity."
Alternatives: "capable of forecasting when" or "able to foresee when".
"He is able to predict when you experience certain chemicals throughout the chew".
After all, you may not be able to predict when a serious illness or accident will require that you make the move.
For example, the model should be able to predict when the brain makes mistakes, and what kinds of problems require more time to solve.
But until Pepsi conducts the test, executives said they would not be able to predict when large-scale production of such bottles might begin.
In an upcoming software upgrade, electric cars from Elon Musk's company will be able to predict when they'll run out of battery — and will direct drivers to the most convenient recharging stations.
Instead of being able to predict when winter will arrive, it shows up without warning in the form of a hard freeze while the plant is still happily metabolizing and doing its thing.
Once a bloom is identified the new system should be able to predict where and when jellyfish are likely to hit the coast.
More importantly, they were able to use this knowledge to predict when an accident is likely to occur and avoid it.
By building a gravitational wave observatory in space, we may be able to reach the sensitivities necessary to predict when a merger involving a supermassive black hole will occur.
He was encouraged when he regained his appetite, but he did not want to predict when he would be able to return to the ice.
Still, experts warn that its hard to predict when Afghanistan will be able to stand on its own against the Taliban, not to mention the country's enormous economic difficulties and fractious political system.
