The Collaborative International Dictionary of English v.0.48:

Forecast \Fore"cast\, n.
   Previous contrivance or determination; predetermination.
   [1913 Webster]

         He makes this difference to arise from the forecast and
         predetermination of the gods themselves. --Addison.
   [1913 Webster]

   2. A calculation predicting future events; the foresight of
      consequences, and provision against them; prevision;
      premeditation; as, the weather forecast.
      [1913 Webster]

            His calm, deliberate forecast better fitted him for
            the council than the camp.            --Prescott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Forecast \Fore*cast"\, v. t.
   1. To plan beforehand; to scheme; to project.
      [1913 Webster]

            He shall forecast his devices against the
            strongholds.                          --Dan. xi. 24.
      [1913 Webster]

   2. To foresee; to calculate beforehand, so as to provide for;
      as, to forecast the weather; to forecast prices.
      [1913 Webster]

            It is wisdom to consider the end of things before we
            embark, and to forecast consequences. --L'Estrange.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Forecast \Fore*cast"\, v. i.
   To contrive or plan beforehand.
   [1913 Webster]

         If it happen as I did forecast.          --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

forecast
    n 1: a prediction about how something (as the weather) will
         develop [syn: prognosis, forecast]
    v 1: predict in advance [syn: forecast, calculate]
    2: judge to be probable [syn: calculate, estimate, reckon,
       count on, figure, forecast]
    3: indicate by signs; "These signs bode bad news" [syn: bode,
       portend, auspicate, prognosticate, omen, presage,
       betoken, foreshadow, augur, foretell, prefigure,
       forecast, predict]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "forecast":
   accounting, actuarial prediction, adumbrate, analysis, anticipate,
   anticipation, apocalypse, arrange, augur, augury,
   automatic electronic navigation, braking, calculate, calculation,
   cast, cast a horoscope, cast a nativity, computation, concert,
   conclude, conjecture, contemplation, contrive, coordination,
   cut out, design, devise, discretion, divine, dope, dope out,
   dowse for water, envisagement, envisionment, fact distribution,
   farseeingness, farsightedness, figure, forebode, foreboding,
   forecasting, forecasts, foreglance, foregleam, foreglimpse,
   forehandedness, foreknown, foresee, foreseeing, foreseen,
   foreshowing, foreshown, foresight, foresightedness, foretell,
   foretelling, foretold, forewarn, forewarning, fortune-tell, frame,
   gather, guess, guesswork, hariolate, improbability, infer,
   inspection, intend, lay plans, longsightedness, looking ahead,
   make a prediction, make a prognosis, make a projection,
   make a prophecy, make arrangements, manipulation, methodize,
   nonlinear calibrations, omen, organize, output measurement, plan,
   plan ahead, portend, prearrange, predict, predicted, prediction,
   prefiguration, prefigure, prefigurement, prefiguring, preparation,
   prepublication, presage, presaged, presaging, presentiment,
   preshowing, presignifying, preview, prevision, probability,
   processing, prognosis, prognosticate, prognostication, program,
   project, promise, prophecy, prophesied, prophesy, prophesying,
   prospect, prospection, prospectus, providence, provision, prudence,
   rationalize, read palms, read tea leaves, read the future,
   readiness, record keeping, sagacity, schedule, schematize, set up,
   shape, soothsay, speculate, speculation, statistical prediction,
   steering, supersonic flow detection, surmise, systematize,
   tell fortunes, tell the future, vaticinate, vaticination, weird,
   work out, work up