Nimbus
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Frequently asked questions
Everything about NimbusLab, our data sources, and how to use each amateur observation tool.
About NimbusLab
Is NimbusLab free? Do I need to sign up?
Where does the weather data come from?
Do you collect my location or personal data?
Can I use NimbusLab for professional forecasting or aviation?
Can I contribute or suggest a tool?
Why does the site focus on niche amateur observation instead of general forecasting?
Tool-specific questions
Cloud Type Identifier
Why is my photo classified as more than one type?
Does the photo get uploaded to a server?
Rainbow Formation Probability
Why is probability 0% at noon?
Can it predict double rainbows?
Fog vs Haze Distinguisher
What if humidity is 95% and visibility is 3 km?
Thunderstorm Distance Calculator
Is the 3-second rule accurate?
Observation Log Template Generator
Can I add custom fields?
Outdoor Observation Risk Assessment
Does this replace official weather warnings?
Sun & Moon Angle Calculator
Why does the Moon panel show 'below horizon'?
Atmospheric Transparency Query
Why is transparency low even on a clear day?
Temperature & Humidity Converter
Why does absolute humidity change with temperature?
Wind Speed & Beaufort Converter
Are gusts included?
Pressure ↔ Altitude Converter
Why does the result differ from my barometer?
Precipitation Conversion Tool
What counts as heavy rain?
Rare Phenomena Calendar
Why is noctilucent cloud probability zero in summer at the equator?
Local Microclimate Query
Why differ from the city weather page?
Solar Term Weather Patterns
Does it apply to my hemisphere?
Polar Day & Night Reference
Why does it list twilight categories?
Meteorological Terminology Simplifier
Is it exhaustive?
Weather Map Legend Explainer
Why are there so many front types?
Historical Weather Lookup
How far back does it go?