Flash Your Lights When Thunderstorms Approach with Home Assistant and Blitzortung

Home Assistant automations do not always have to solve a practical problem. Sometimes the best projects are simply the ones that make your smart home feel alive.

One fun example is using the Blitzortung integration in Home Assistant to flash indoor lights, change colors, or create dramatic lighting effects whenever a thunderstorm is detected nearby. It is not something you need, but it is a surprisingly entertaining way to make weather events part of your smart home experience.

Imagine sitting indoors while the sky darkens outside. Suddenly your hallway lights pulse blue or your living room lamps flash white as lightning strikes are detected nearby. It is a small detail, but it adds personality to your setup and becomes a great conversation starter for guests.

In this guide, we will look at:

• What Blitzortung is
• How the Home Assistant integration works
• What hardware you need
• How to create a lightning alert automation
• Ideas for expanding the concept further

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What Is Blitzortung?

Blitzortung.org is a community-driven lightning detection network. Thousands of volunteers around the world operate lightning detectors that share real-time data about lightning strikes and thunderstorms.

The Home Assistant integration allows you to use this data directly inside your automations. The integration can detect:

• Distance to lightning strikes
• Number of strikes
• Direction of storms
• Whether lightning activity is increasing or decreasing

This makes it possible to trigger automations based on nearby thunderstorm activity.

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Why Use It for Lighting Effects?

There are already plenty of practical uses for weather integrations:

• Closing blinds during storms
• Sending notifications
• Protecting outdoor equipment
• Monitoring severe weather

But lighting effects are different. They are purely for atmosphere and fun.

Smart homes can sometimes feel overly technical and utilitarian. Small creative automations like this help make your home feel more dynamic and interactive.

Some examples include:

• Flashing lights white when lightning is detected
• Changing LED strips to dark blue during storms
• Making outdoor lights pulse purple
• Triggering spooky effects during autumn
• Combining thunderstorm detection with audio alerts

This project works especially well if you already have smart RGB lighting such as:

• Philips Hue
• IKEA TRÅDFRI
• WLED
• Shelly-controlled lighting
• Zigbee RGB bulbs
• ESPHome LED strips

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Components Needed

The setup is fairly simple.

1. Home Assistant

You need a working Home Assistant installation.

Home Assistant

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2. Blitzortung Integration

The Blitzortung integration is available directly in Home Assistant.

You can add it from:

• Settings
• Devices & Services
• Add Integration
• Search for Blitzortung

Official documentation:

Blitzortung Integration Documentation

Once configured, Home Assistant will create sensors and events related to lightning strikes near your configured location.

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3. Smart Lights

Almost any smart lighting platform supported by Home Assistant will work.

RGB-capable lights provide the best experience because you can create more dramatic storm effects.

Examples:

• Philips Hue bulbs
• WLED strips
• Zigbee RGB controllers
• ESPHome-based LED strips
• Nanoleaf panels

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Understanding the Blitzortung Events

The integration generates lightning strike events whenever activity is detected within your configured radius.

A typical automation can react to:

• Lightning strikes within 10 km
• Frequent strike activity
• Storms moving closer
• Storms moving away

For a fun indoor effect, a radius between 5 km and 15 km usually works well.

A smaller radius prevents your lights from constantly flashing during distant storms.

European distance units are used automatically, so everything is measured in kilometers.

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Example Automation: Flash the Living Room Lights

This automation flashes your living room lights white for a brief moment whenever lightning is detected nearby.

The effect mimics a real lightning flash indoors.

alias: Thunderstorm Lightning Effect
description: Flash living room lights when lightning is detected nearby

trigger:
  - platform: event
    event_type: blitzortung_lightning_strike

condition:
  - condition: numeric_state
    entity_id: sensor.blitzortung_lightning_distance
    below: 10

action:
  - service: light.turn_on
    target:
      entity_id: light.living_room
    data:
      rgb_color: [255, 255, 255]
      brightness_pct: 100
      flash: short

mode: single

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How This Automation Works

Let us break it down.

Trigger

event_type: blitzortung_lightning_strike

This listens for lightning strike events generated by the Blitzortung integration.

Every nearby strike creates an event in Home Assistant.

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Condition

below: 10

This ensures the lightning strike is within 10 km.

Without this condition, your lights may react to storms very far away.

You can adjust the value depending on how sensitive you want the automation to be.

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Action

flash: short

This tells compatible lights to briefly flash.

Some lighting systems may not support the flash parameter. In that case you can simulate it using delays and brightness changes.

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More Dramatic RGB Effects

If you use RGB lighting, you can make the experience much more immersive.

Here is an example using blue storm lighting.

alias: Thunderstorm Mood Lighting

trigger:
  - platform: event
    event_type: blitzortung_lightning_strike

condition:
  - condition: numeric_state
    entity_id: sensor.blitzortung_lightning_distance
    below: 15

action:
  - service: light.turn_on
    target:
      entity_id: light.led_strip
    data:
      rgb_color: [0, 0, 255]
      brightness_pct: 30

  - delay: "00:00:01"

  - service: light.turn_on
    target:
      entity_id: light.led_strip
    data:
      rgb_color: [255, 255, 255]
      brightness_pct: 100

  - delay: "00:00:01"

  - service: light.turn_on
    target:
      entity_id: light.led_strip
    data:
      rgb_color: [0, 0, 100]
      brightness_pct: 20

mode: restart

This creates:

1. A dim blue storm ambiance
2. A bright lightning flash
3. A darker blue nighttime effect

The result feels surprisingly cinematic during real thunderstorms.

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Ideas for Expanding the Automation

Once you start experimenting, there are many fun directions to take this.

Add Thunder Sounds

You can play thunder effects through smart speakers when lightning strikes occur.

For example:

• Sonos speakers
• Google Nest devices
• Home Assistant Voice
• ESPHome media devices

Combine this with flashing lights for a full storm simulation.

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Trigger Halloween Effects

This automation becomes especially fun during autumn and Halloween.

Ideas include:

• Purple lighting flashes
• Spooky sound effects
• Flickering candles
• Animated LED strips
• Smart fog machines

You can even activate a “storm mode” scene automatically.

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Outdoor Storm Indicators

Instead of flashing indoor lights, use outdoor lighting to indicate approaching storms.

Examples:

• Garden lights turning blue
• Porch lights pulsing white
• Garage lighting changing color

This can also function as a visual weather warning.

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Use Different Distances

You can create layered effects depending on storm proximity.

Example:

Distance	Effect
20 km	Dim blue lighting
10 km	White flashes
5 km	Audio thunder effects
2 km	Full storm scene

This creates a much more dynamic experience.

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Performance Considerations

Lightning events can happen frequently during active storms.

A few tips:

Use Restart Mode

mode: restart

This prevents automations from queuing endlessly during heavy lightning activity.

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Avoid Excessive Flashing

Too many flashes can become annoying quickly.

You may want to:

• Add cooldown timers
• Only react at night
• Limit flashes to severe storms

Example night-only condition:

condition:
  - condition: sun
    after: sunset

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Be Careful with Bedroom Lighting

This sounds obvious, but lightning effects in bedrooms at 02:00 may not be appreciated by everyone in the household.

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Combining with Energy-Aware Automations

Although this project is mainly for fun, you can still keep energy usage reasonable.

Modern LED lighting uses very little power, typically only a few watts per bulb. Even frequent storm effects generally consume minimal energy compared to larger household loads measured in kWh.

If you already monitor energy consumption in Home Assistant, you can even create conditions that disable decorative effects during high energy prices.

This is a fun example of combining practical energy monitoring with playful automations.

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Final Thoughts

Not every Home Assistant automation needs to optimize your life.

Some automations exist simply because they are fun.

Using Blitzortung to flash lights or create storm-themed lighting effects is one of those projects that makes your smart home feel more alive and interactive. It is easy to set up, requires very little hardware, and can easily be customized to fit your own style.

Whether you want subtle blue ambient lighting or full dramatic lightning effects throughout your house, the Blitzortung integration opens up a lot of creative possibilities.

And honestly, the first time your lights flash in sync with a real thunderstorm outside, you will probably grin like a child.