How to Read a Weather Radar App

Weather radar apps show storms moving toward you in real time — learn to read the color coding and know when it is safe to go outside.

In this guide (5 steps):

1.Download a radar app
2.Allow location access
3.Interpret the color scale
4.Animate the radar to see movement
5.Use radar for decision-making

Download a radar app

~15s

Search "MyRadar" or "Weather Underground" in the App Store or Google Play — both are free. Or go to weather.gov and tap "Radar" for the official National Weather Service radar.

Allow location access

~15s

When prompted, allow the app to access your location. This centers the radar on your area automatically so you can see storms approaching your town.

Interpret the color scale

~15s

Look at the color legend (usually on the left or bottom edge of the radar). Green = light rain; yellow/orange = moderate to heavy rain; red = very heavy; purple = extreme. The brighter the color, the more intense the precipitation.

Animate the radar to see movement

~20s

Tap the "play" button (a triangle or clock icon) to animate recent radar frames. Watch the direction the colors move across the map — this shows you which way the storm is heading.

Quick Tip

Look for your approximate location on the map (the dot or crosshair) and watch whether the storm color is moving toward or away from you.

Use radar for decision-making

~23s

Before outdoor activities — yard work, a walk, a sporting event — check radar first. If green or yellow is 30 minutes away, you may have time. If red is right on top of you, stay inside.

Warning

Radar shows precipitation, not danger from lightning. If a thunderstorm is in your area — even light rain in the cell — go indoors. Lightning can strike miles from where rain is falling.

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Weather radar apps show precipitation — rain, snow, sleet — moving across the map in real time. Unlike a regular forecast that says "30% chance of rain," radar shows exactly where rain is happening right now and where it is heading.

How radar colors work

: Most radar apps use a green-yellow-orange-red color scale: - Green: Light rain or light snow - Yellow: Moderate rain - Orange: Heavy rain - Red: Very heavy rain, possible thunderstorms - Purple or dark red: Extreme precipitation, hail possible

The colors represent intensity, not danger. Green rain is perfectly fine to walk in; red or purple means seek shelter.

Reading movement

: Most radar apps have a "play" button to animate the radar and show storms moving. Watch the direction and speed of movement to estimate when a storm will reach your location.

Popular radar apps

: - MyRadar: Minimal, fast app that opens directly to radar — great for quick checks - Weather Underground: Detailed, community-reported conditions alongside radar - RadarScope: Advanced radar for weather enthusiasts — more data, steeper learning curve - Weather.gov: The National Weather Service website has free official radar with no ads

Winter radar

: Snow appears lighter on radar than rain of equal intensity. Purple on winter radar often indicates ice pellets or freezing rain — a hazard for driving and walking.

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