Weather Radar & Satellite Imagery, Explained
What radar and satellite each show, and which radar features matter.
By Xavier Santos
Co-founder & CTO
Weather radar and satellite imagery answer different questions. Radar detects precipitation, lightning, and storm structure happening now, close to the ground. It is what you watch during active weather. Satellite imagery shows clouds and large-scale systems from above, useful for the bigger picture. The most capable apps combine both, and add future radar to project where storms are heading.
What’s the difference between radar and satellite?
Radar (RADAR = radio detection and ranging) sends out radio waves and measures what bounces back off raindrops, hail, and snow. It is your best tool for what is happening right now near the surface: rain intensity, hail cores, and storm rotation.
Satellite imagery is captured from orbit and shows clouds, moisture, and large weather systems from above. It is excellent for seeing the shape and movement of big systems, but it does not measure precipitation at the ground the way radar does.
- Radar: Precipitation, hail, lightning, and rotation happening now, near the surface.
- Satellite: Clouds and large-scale systems from above, for the big-picture context.
- Together: Radar for the next few minutes to hours; satellite for the days-ahead pattern.
What is Doppler radar, MRMS, and future radar?
Doppler radar measures not just where precipitation is, but how it is moving, which is how meteorologists spot rotation that can signal a tornado. MRMS (Multi-Radar/Multi-Sensor) merges many radar and sensor feeds into a single, high-resolution national picture that updates rapidly.
Future radar is a short-range forecast of the radar itself: it projects where precipitation will move over the coming hours so you can plan around a storm instead of only reacting to it.
Which advanced radar features actually matter?
Beyond a basic precipitation layer, the features that change decisions during severe weather are:
- Lightning density: Shows where a storm is electrically active and intensifying.
- Hail probability & size: Flags hail cores and estimated stone size for property and vehicle risk.
- Rotation detection: Highlights the rotation associated with tornado risk.
- Future radar: Projects storm motion so you can see what is coming to your location.
- High resolution: Finer detail resolves individual cells instead of a smeared blob.
How does ZoneWatch handle radar and imagery?
ZoneWatch provides high-resolution radar built on MRMS technology, with layers for precipitation, lightning density, and hail probability, plus future radar predictions and real-time lightning detection. The goal is a clear, fast picture of what is happening near you and what is coming next, without the clutter of a general-purpose weather app.
Frequently asked questions
Xavier Santos is the co-founder and CTO of WeatherWise Innovations, the U.S. company behind ZoneWatch, and the engineer and designer behind the product. He builds the high-resolution radar, forecast models, and real-time lightning, hail, and flood detection that power its alerts, along with the iOS, Android, and web apps, and has founded and shipped several other software and AI products.
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