EF Scale
The ultimate reference guide
Free
Rate tornado damage the way surveyors do. EF Scale puts the complete
Enhanced Fujita scale on your iPhone, iPad, and Mac — all 28 damage
indicators, every degree of damage, and the expected wind speeds
behind each rating.
Browse structure types from small barns and family residences to
high-rise buildings, transmission lines, and trees. Compare what you
see against reference photos and construction details, then pick a
degree of damage and tune the wind speed estimate between its bounds
to account for construction quality.
• All 28 damage indicators of the Enhanced Fujita scale
• Reference photos and construction details for every indicator
• Degrees of damage with expected wind speeds and EF ratings
• Interactive wind speed estimator with adjustable bounds
• EF0–EF5 rating reference, always a tap away
• Everything stored on device — works fully offline in the field
Built for storm spotters, damage surveyors, emergency managers,
students, and weather enthusiasts.
*** PLEASE REMEMBER: This app is for reference purposes only. Doing a real damage survey takes knowledge and experience you can't build into an app! Official damage assessments are the business of the National Weather Service and their delegates! ***
Updated UI
The developer, WeatherWary LLC, 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
- WeatherWary LLC
- Size
- 18.9 MB
- Category
- Weather
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 WeatherWary LLC