KIRAKU

See how weather works

Free · Designed for iPad. Not verified for macOS.

Nine meteorology simulations — general circulation, cyclones, typhoons, precipitation, the jet stream, and ENSO. Touch and play to grasp atmospheric physics. KIRAKU is a visual-first meteorology education app. It helps you see how the atmosphere, weather, and climate actually work. This is the 19th title in a science-learning series that already covers mathematics, physics, electricity, waves, thermodynamics, astronomy, optics, quantum mechanics, fluid dynamics, probability, geometry, chemistry, microbiology, neuroscience, mechanical engineering, geology, genetics, and oceanography. KIRAKU's theme is meteorology. Nine carefully designed simulations cover the essentials from high-school earth science to introductory university meteorology. [Nine Simulations] - General Circulation Visualize the three-cell model (Hadley, Ferrel, Polar) on a globe. Six surface wind belts — trade winds, westerlies, and polar easterlies — are bent by the Coriolis force and shown as color-coded particle flows. - Atmospheric Profile Temperature and pressure across the troposphere, stratosphere, mesosphere, and thermosphere. Curves follow the US Standard Atmosphere, with an altitude cursor for reading temperature and pressure at any height. - Cloud Formation How rising moist air cools adiabatically, hits its dew point, and condenses. The contrast between the dry lapse rate (9.8 C/km) and the moist lapse rate (~6 C/km) governs cloud growth, with all ten standard genera explained. - Cyclones and Fronts How cold and warm air masses meet to form warm, cold, and occluded fronts inside an extratropical cyclone, with the strong updrafts that drive most of the precipitation. - Typhoon Structure Tropical cyclones develop over seas above 26.5 C. See the calm eye, the violent eyewall, and the spiral driven by the Coriolis force, plus the maximum-wind categories. - Precipitation How cloud droplets (~10 micrometers) grow into raindrops (~1 millimeter) through warm rain (collision-coalescence) and cold rain (the Bergeron process). Temperature and updraft strength decide whether snow, rain, sleet, or hail falls. - Radar and Satellite How weather radar maps rainfall from echo intensity and wind from the Doppler shift, and how visible and infrared satellite imagery classify clouds by brightness and cloud-top temperature. - Jet Stream The strong upper-tropospheric westerlies and the Rossby-wave meanders that drive daily weather, plus blocking patterns that trigger extreme events and reshape aircraft routes. - El Nino / La Nina The Pacific climate seesaw — how trade-wind strength shifts the equatorial warm pool east or west on multi-year timescales, and how that propagates into global rainfall, temperature, and extreme weather. [Highlights] - Every simulation ships with an Info sheet covering the underlying physics - Real, textbook-grade concepts: general circulation, lapse rates, geostrophy, cyclone dynamics, ENSO - Japanese and English UI - Dark and light themes - Clean, distraction-free interface [Best for] - Students in earth science or introductory meteorology - Anyone curious about how weather and climate really work - Teachers looking for visual classroom material - News-savvy readers who want to understand climate change, severe weather, and typhoons

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The developer, Fuji Bit Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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Information

Provider
  • Fuji Bit Inc.
Size
  • 25.4 MB
Category
  • Education
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPad
    Requires iPadOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English and Japanese
Age Rating
4+
Copyright
  • © 2026 Fuji Bit
  • Developer Website
  • Privacy Policy

    • More by Fuji Bit Inc.

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