Difference between Foretell and Portend

FORETELL vs PORTEND: VERB

To tell what's going to happen in the future, especially but not necessarily by having the power of clairvoyance and using it.
Indicate by signs
Foreshadow or presage
Make a prediction about; tell in advance

To serve as an omen or a warning of; presage.
To indicate (events, misfortunes, etc.) as in future; to foreshow; to foretoken; to bode; -- now used esp. of unpropitious signs.
To stretch out before.
To indicate by prediction; forecast.

To tell beforehand, or in advance of the event; predict; prophesy.
Synonyms To vaticinate; Foretell, Prophesy, Predict, Presage, Forebode, Prognosticate, may represent the act of a person correctly or incorrectly asserting what will happen. Foretell is the general word for telling beforehand, and generally correctly. Prophesy and predict are often used lightly for foretell, but in strictness they are more forcible words, prophesy, through its use in the Scripture, often implying supernatural help, and predict precision of calculation or knowledge. Presage implies superior wisdom or perception; to forebode is to anticipate or prophesy evil, especially indefinite evil. To prognosticate is to foretell by studying signs or symptoms: as, to prognosticate bad weather or the course of a disease. See omen.
To utter prediction or prophecy.
Indicate, as with a sign or an omen
Make a prediction about
Tell in advance

Forecast, Anticipate, Betoken, Omen, Prognosticate, Bode, Augur, Prefigure, Forebode, Herald, Harbinger, Predict, Presage, Foreshadow, Portend

Loom, Signify, Foresee, Auspicate, Forecast, Prognosticate, Betoken, Predict, Omen, Prefigure, Augur, Bode, Foretell, Presage, Foreshadow

Call, Announce, Annunciate, Forecast, Anticipate, Betoken, Omen, Prognosticate, Augur, Prefigure, Forebode, Herald, Presage, Foreshadow, Portend

Materialize, Bespeak, Precede, Allude, Forestall, Foresee, Auspicate, Forecast, Prognosticate, Betoken, Omen, Prefigure, Augur, Presage, Foreshadow

Recent events foretell a dangerous future for money today.
Dionysus appears to foretell the fortunes of all.
Angina back and foretell me in three categories.
Patroklos, why should you thus foretell my doom?
Yes, my brother, I can foretell the issue.
Angina following and foretell me in three categories.
Now we know you can foretell the future.
To preach the gospel beforehand, foretell good tidings.
Did not Christ foretell his own resurrection be.
Foretell ability is really powerful, costing just one mana, after you foretell it.