Adiabat
Offline Skew-T sounding lab
$0.99 · Designed for iPad. Not verified for macOS.
Read the atmosphere like a forecaster: Skew-T log-P parcel theory, severe indices, and an interactive hodograph — all computed on your device, no signal required.
Adiabat is a serious, offline Skew-T log-P workbench for pilots, glider and paraglider crews, storm chasers, and forecast enthusiasts who need to read an atmospheric sounding where there is no signal.
Every number is computed on your device from real parcel theory and bundled reference data. There is no account, no subscription, and no cloud round-trip. Open the app on a plane, in a launch field, or in a dead-zone cove and it works exactly the same.
FULL SKEW-T LOG-P DIAGRAM
• Temperature and dewpoint traces on a proper skewed log-pressure grid
• Dry adiabats, moist (pseudo) adiabats, and mixing-ratio lines
• Lifted-parcel curve with shaded CAPE and CIN areas
• LCL, LFC, and EL levels marked on the diagram
• Wind barbs alongside the profile
• Touch anywhere to read pressure, temperature, and height
PARCEL THEORY DONE RIGHT
• Surface-based, mixed-layer, and most-unstable parcels
• CAPE, CIN, LCL, LFC, EL, and Lifted Index
• Virtual-temperature correction for realistic buoyancy
• RK4 integration of the moist adiabat, not lookup tables
SEVERE-WEATHER INDICES
• 0–1 km and 0–6 km bulk shear
• Storm-relative helicity (0–1 km and 0–3 km)
• Energy-Helicity Index
• 0–3 km, 700–500 hPa, and 850–500 hPa lapse rates
• Precipitable water, freezing level, K-index, Total Totals
INTERACTIVE HODOGRAPH
• Height-coloured wind trace
• Bunkers right- and left-moving storm motion
• 0–6 km mean wind and storm-relative geometry
HAZARD DIAGNOSTICS
• Airframe icing layers in the supercooled saturated range
• Near-saturation cloud layers with estimated coverage
• Plain-language convective summary
GLOBAL STATION DATABASE, BUNDLED
• Tens of thousands of surface and upper-air stations
• The IGRA radiosonde network plus ICAO/IATA airports
• Search by name or code, or find stations near you
• A locator map drawn from bundled coastline data
TERRAIN CROSS-SECTIONS
• Great-circle terrain profiles from a bundled global relief grid
• Reference heights (freezing level, LCL, EL) overlaid
• Preset mountain transects or your own coordinates
REPRESENTATIVE SOUNDINGS, EDIT YOUR OWN
• A set of real observed soundings across convective, tropical, arctic, and maritime regimes
• Build or edit any sounding level by level, entirely offline
• Export an annotated analysis as text
PRIVATE BY DESIGN
Adiabat collects nothing and sends nothing. Location, if you enable it, is used only on the device to find nearby stations and never leaves it.
Note: Adiabat’s diagnostics are advisory and are derived from a single vertical profile. They are educational and planning aids and are not a substitute for official aviation, marine, or severe-weather products.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert Corbin
- Size
- 24.6 MB
- Category
- Weather
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin
