Stormlo
Weather, radar, models
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
Now with severe-weather warning notifications, tap any alert to open the official warning, clearer day-by-day forecast icons, and a smoother radar.
Stormlo gives you the weather you actually need — clean current conditions, a scrubbable rain radar, deep meteograms, and serious meteorological depth one tap away.
Today
• Current temperature, feels-like, and conditions
• Hourly strip for the next 24 hours
• 7-day outlook with rain probability, max/min, and UV
• Sunrise / sunset / pressure / humidity / wind
Radar
• High-resolution rain radar with smooth scrubbable playback
• Past 2 hours plus short-term forecast frames
• Global coverage via RainViewer
Forecast
• Hourly meteogram: temperature, precipitation probability, wind
• Day-by-day breakdown with precipitation totals, UV, wind
• Multi-model comparison: stack ECMWF, GFS, ICON, UKMO, MeteoFrance and JMA on a single chart — see which models agree
Alerts
• Live severe-weather alerts via the US National Weather Service
• Clear "all clear" state when nothing's active for your area
• Pull to refresh, tap for full alert detail
Settings
• Choose your units: Celsius/Fahrenheit, km/h/mph/m/s/knots, hPa/inHg/mbar
• Open the supporting site, privacy policy, terms, and support
Sources
• Forecast: Open-Meteo (multi-model, free, global)
• Radar: RainViewer (global composite)
• Alerts: US NWS
Stormlo Pro
The core app is free. Stormlo Pro is an optional auto-renewable subscription:
• Stormlo Pro (Monthly) — billed every 1 month
• Stormlo Pro (Yearly) — billed every 1 year
Prices are shown in the app before you purchase. Payment is charged to your Apple Account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours prior to the end of the period. You can manage or cancel your subscription any time in your Apple Account settings.
Terms of Use (EULA): https://app.maddisys.co.uk/terms
Privacy Policy: https://app.maddisys.co.uk/privacy
No ads. No tracking SDKs.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• Clearer daily forecast icons — sunny and thundery days no longer look overcast; each day's icon now reflects what the daylight hours actually look like.
• Tap a severe-weather alert to open the official Met Office (UK) or National Weather Service (US) warning.
• New: severe-weather warning notifications — get notified when an official warning is issued for your area (free; manage in Settings).
• A 'Loading radar…' indicator so the radar map no longer looks blank while it loads.
The developer, Maddisys Limited, 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
- Size
- 5.8 MB
- Category
- Weather
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 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. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Stormlo Pro Yearly 34,99 €
- Stormlo Pro Monthly 5,99 €
- Provider
Maddisys Limited
- Maddisys Limited has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
Shaws End
Rochester Way
Crowborough
N/A
TN6 2DR
United Kingdom - Phone Number
+44 7907519939 - Email
info@maddisys.co.uk
- Copyright
- © 2026 Maddisys Limited