
die Prognose
forecast
A prediction about the future development of something, based on data, analyses, or experience.
Die wirtschaftliche Prognose für das nächste Jahr ist positiv.
The economic forecast for next year is positive.
prognosis / forecast
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forecast
A prediction about the future development of something, based on data, analyses, or experience.
Die wirtschaftliche Prognose für das nächste Jahr ist positiv.
The economic forecast for next year is positive.

prognosis
In medicine, the prediction of the likely course and outcome of an illness.
Nach der erfolgreichen Behandlung ist die Prognose des Patienten sehr gut.
After the successful treatment, the patient's prognosis is very good.
A prognosis or forecast is typically 'gestellt' (made/given) or 'abgegeben' (issued/given). Later, a prognosis can 'sich bestätigen' (be confirmed) or turn out to be wrong.
Experten stellen eine positive Prognose für die Wirtschaft.
Experts are making a positive forecast for the economy.
To evaluate a prognosis or forecast, adjectives such as 'gut' (good) or 'schlecht' (bad), 'positiv' (positive) or 'negativ' (negative), and 'optimistisch' (optimistic) or 'pessimistisch' (pessimistic) are often used.
Die erste Prognose war zu optimistisch und musste korrigiert werden.
The first forecast was too optimistic and had to be corrected.
To express what the prediction refers to, the preposition 'für' (for) with the accusative is usually used.
Die Prognose für das nächste Quartal sieht gut aus.
The forecast for the next quarter looks good.
You can recognize the medical meaning from the context. Words such as 'Arzt' (doctor), 'Patient' (patient), 'Krankheit' (illness), or 'Heilungschancen' (chances of recovery) clearly point to a medical prognosis.
Der Arzt gab dem Patienten eine vorsichtige Prognose.
The doctor gave the patient a cautious prognosis.
tip / prediction
Tipp and Prognose can both state the expected outcome of a sporting competition. A Tipp is usually a personal prediction, often in a prediction game or a bet. A Prognose sounds more neutral and is more likely to be based on data, analysis, or experience.

Die Prognose der Experten lautet nach der Datenanalyse zwei zu eins für Köln.
After analyzing the data, the experts’ forecast is 2–1 to Cologne.
Mein Tipp für das Spiel lautet zwei zu eins für Köln.
My prediction for the game is 2–1 to Cologne.