Disaster Alert Mobile App

I need a cross-platform mobile app that keeps me instantly informed about major natural-disaster events across Ontario and, in a separate feed, the rest of Canada. The core screens should cover heavy rain and flooding, wildfire damage, and wind or tornado destruction. Each screen shows the latest news plus location-tagged warnings; when something significant happens I expect to receive push notifications on my phone, backed up by an email and SMS so nothing is missed.

Here’s what I’m after:

• iOS and Android builds published through TestFlight / closed testing first, then the public stores.
• Two geography filters: “Ontario” and “Canada-wide”, each with its own news and alert stream.
• Real-time ingestion of authoritative data sources (for example Environment Canada feeds or similar) combined with relevant media items so notifications can include a concise summary, an optional detailed report, and images or short clips when available.
• A lightweight admin or config panel where I can adjust alert thresholds, add or remove regions, and edit the text templates for the three notification channels.
• Secure, reliable back-end that queues and sends push, email, and SMS alerts with minimal delay.

Acceptance criteria
1. A live weather event in a test region triggers all three notification types within two minutes.
2. Switching between “Ontario” and “Canada-wide” immediately refreshes the feed with no stale items.
3. The app passes App Store and Google Play review and runs smoothly on the latest two OS versions.

I’m happy to discuss which frameworks (React Native, Flutter, native Swift/Kotlin, etc.) make the most sense as long as the end result is fast, stable, and easy to maintain.