The Ultimate Lightning Guide for Airport Operations

Time to read: đź•’ 26 minutes

The ultimate guide to help airports, airlines, and fixed-based operators (FBOs) navigate lightning’s many safety and operational challenges.

Jump through this helpful guide or read the entire thing to learn everything there is to know about lightning and its impact on the aviation industry.

Airport Operations and Weather: An Overview

We don’t have to tell you that weather greatly impacts airport operations. Conditions associated with thunderstorms, winter storms, and extreme events impact various key stakeholders in the industry. According to the Federal Aviation Agency, weather is responsible for 69% of all air traffic delays in the National Airspace System.

A graph showing the reasons behind flight delays for the year 2016. Weather is the top reason for delays causing 69% of them in 2016.
Data Source: FAA October 2017 Report “Air Traffic by the Numbers”

But did you know that the majority of these delays are from convective weather, like thunderstorms?

The below image shows the various weather conditions identified by our meteorologists that impact airport operations.

Types of Severe Weather - Airport Operations

Severe thunderstorms include many of the threats illustrated above, including:

A red check mark with a transparent background Wind gusts

A red check mark with a transparent background Hail

A red check mark with a transparent background Heavy rain/flooding

A red check mark with a transparent background Fog

A red check mark with a transparent background Lightning

DOWNLOAD NOW: 2019 Airport Operations Weather Safety Report

All About Lightning

An animated GIF of lightning lighting up the sky with the words "All About Lightning" in the middle

Close your eyes and picture a lightning strike.

We bet you’re picturing a bolt that seems to extend from the clouds down to the ground or a tree. Maybe, given our discussion of airport operations, your bolt of lightning is striking a plane or an air-traffic control tower.

These types of lightning strikes, called cloud-to-ground lightning strikes, only make up approximately 20% of all lightning strikes. What type of lightning makes up the other 80%?

It’s the type of lightning you don’t always see: in-cloud lightning. In-cloud lightning strikes jump from cloud-to-cloud up in the sky.

The combination of in-cloud lightning and cloud-to-ground lightning is called total lightning.

Total lightning is the complete picture of lightning activity in a region. Total lightning networks detect the most at-risk areas and are able to prompt advanced warnings for thunderstorms and other severe weather events.

Why is that important? When you break it down, lightning is the most reliable indicator of storms. In fact, lightning is detected in an overwhelming majority of storm reports within a 30 km radius and 45 minutes before and after a severe weather event:

A lightning bolt icon that is multicolored with a gradient from red to yellow 90% of high wind reports include lightning

A lightning bolt icon that is multicolored with a gradient from red to yellow 94% of all tornado reports include lightning

A lightning bolt icon that is multicolored with a gradient from red to yellow 99.6% of all hail reports include lightning

Lightning Development

So how does lightning develop? While scientists aren’t completely sure why lightning happens, we do know how it happens. This electric current forms in a cloud. When the ground is hot, it heats up the air above it. As warm air rises, the cloud gets bigger and bigger. However, the whole cloud isn’t warm. In the tops of clouds, temperatures are actually below freezing. It’s so cold that the water vapor turns into ice!

When this hot air and cold air meet, a thunderstorm forms. Lots of small pieces of ice bump into each other as they move around. This is what starts a lightning bolt. These particles hitting each other create an electrical charge.

A graphic showing how lightning develops

As the cloud fills up with electrical charges, lighter positive-charged particles form at the top of the cloud. The heavier negatively-charged particles sink to the bottom. When both charges grow large enough, lightning occurs between them.

Lightning heads towards the ground and becomes a danger to those outdoors when a build up of positive charge happens on the ground beneath the cloud. This is attracted to the negative charge at the bottom of the cloud, so it concentrates around anything that sticks up into the air. That’s why trees, air-traffic control towers, and even people make great lightning conductors! The positive charge from the ground connects with the negative charge from the cloud, creating cloud-to-ground lightning.

A graphic showing the development of lightning

Lightning sensors work to detect lightning both in-cloud and cloud-to-ground lightning at the end of the development.

Threat of Lightning Casualties

Believe it or not, there is a “sweet spot” of sorts when it comes to lightning incidents. This is when the most injuries and deaths occur as a result of lightning. Knowing this sweet spot can help you protect your airport and ground operations from a lightning strike.

Most people would think that they’re most at risk during a thunderstorm when it’s directly overhead. However, that’s untrue. By the time a thunderstorm is overhead, most people have already sought shelter.

GIF showing the threat of lightning casualties from high to low when a thunderstorm is approaching, is overhead, and is departing. Shows the greatest risk is right before a thunderstorm arrives and right after it leaves
Image courtesy of NOAA

The greatest number of lightning casualties happen right before a thunderstorm arrives and right after it begins to depart. Oftentimes, people do not seek shelter or stop outdoor operations quickly enough to protect themselves from the lightning strikes that occur before the storm. On the other hand, the sun may lure people out of shelter to resume outdoor activities when lightning is still within striking distance. Automated lightning alerts and all clear signals from a system that relies on total lightning detection is the best way to reduce the injuries, casualties, and property damage caused by lightning and stop them from happening in the first place.

The Thunderstorm Challenge

As we know, thunderstorms typically come with a healthy dose of lightning, a beautiful but deadly natural phenomenon. This hazardous form of severe weather is a threat to people both indoors and out from over 8 miles away. .

While lightning isn’t always the most disruptive weather condition when it comes to the aviation industry, it is one of the most dangerous to workers on the ground. And it can be pretty terrifying when lightning strikes a plane in the air .

A bolt of lightning striking a plane while the plan is in-flight

One of the most dangerous aspects of lightning is that it can occur anywhere in the world at any time, on the ground and in the clouds. This differs from hurricanes that only impact coastal airports or tornadoes that only cause delays in areas like the Midwest of the United States. Lightning can affect your airport operations no matter where your flights are taking off or landing, and like all weather-related delays, cause a ripple effect on air traffic globally.

A Billion-Dollar Problem

If your top concern isn’t safety, it’s most likely your wallet. Severe weather can strike a definitive blow there as well.

In 2017 alone, there were a whopping 16 weather and climate disasters in the United States that exceeded $1 billion in damages. These threats, including hurricanes, tornadoes, and thunderstorms, collectively caused over $306.2 billion in damages. While 2017 was certainly an extremely active year for such disasters, 2015 and 2016 saw financial impacts of $200 billion and $175 billion respectively. Recent history proves that this is not an isolated incident.

While it might not cost your specific organization billions, per say, severe weather does have an extreme financial impact on aviation operations as a whole. According to a study commissioned by the FAA back in 2010, flight delays cost the airline industry over $8 billion a year. When you look at the big picture of delays costs the total number was over $32.9 billion back in 2007, with over half the cost borne by passengers.

Chart that shows the direct cost of air transportation delay in 2007. Cost to Airlines: $8.3 billion, Cost to passengers $16.7 billion, Cost from lost demand $3.9 billion, Total direct cost $28.9 billion, Impact on GDP $4.0 billion, Total cost $32.9 billion
Data Source: FAA Research Report done in 2010

Airport Operations and Lightning: It’s Everyone’s Problem

It’s clear that lightning is dangerous and expensive problem for airport operations and impacts everyone involved. Most of the industry understands this thanks to first-hand experience. Over 75% of professionals who took our audit admitted lightning has a large impact on their operations.

DOWNLOAD NOW: 2019 Airport Operations Weather Safety Report

simply too much at risk. However, it’s difficult to decide when to stop and resume operations safely. There is a fine line between operational safety and operational efficiency. Both are important but balancing the two can be like walking a tightrope for airport operation professionals trying to meet scheduled flight times.

As part of this challenge, airport operations put lives at risk when airport personnel, airlines, and FBOs do not know the answers to critically important questions, like:

A red check mark with a transparent background How do you decide when a thunderstorm or other severe weather event is a threat?

A red check mark with a transparent background Who decides that: The airport, airline, or FBO? A local meteorologist? A team of meteorologists?

A red check mark with a transparent background What qualifies them to make the call?

A red check mark with a transparent background Where does your weather data and storm warnings come from?

A red check mark with a transparent background How reliable is that information?

Other Risks

Even when an airport operations team is comfortable answering all of these questions, there are still things that can go wrong. A glaring example is the risk posed by outdated technology. An outdated lightning detection (or prediction) system can result in false or missed alarms, putting your ground crews, outdoor equipment, airplanes, and even passengers at risk.

Another risk comes from too manual of an alerting process. With manual alerts, there are delays with relaying the message that can waste precious time. When it comes to lightning safety, minutes make a difference.

Further complicating matters, operational suspension and resumption procedures typically vary from airport to airport, which can be confusing for airlines.

Making the decision to stop outdoor operations also varies based on the lightning detection method and technology in place, availability of meteorologists, and chosen safety buffers.

When Things Go Wrong

Severe convective weather can cause big headaches for airports, airlines, and FBOs alike. Let’s take a look at three different cases where thunderstorms, and more specifically lightning caused big problems for airports across the United States.

Case 1 – San Francisco International Airport

A picture of an airplane at a terminal at an airport with a pretty multicolored dusk sky

These types of lightning incidents aren’t limited to Florida – the lightning capitol of the United States. On the other side of the country, San Francisco International Airport had a close call with lightning back in 2017. Located just 30 miles south of downtown San Francisco, San Francisco International Airport is the seventh-busiest airport in the United States. Since it also serves as the hub for United Airlines and Alaska Airlines, this is a very busy airport for operations on the ground.

While thunderstorms – and rain in general – aren’t very common in California, airports in the Golden State still need to be prepared when severe weather rolls in. The folks at San Francisco International Airport were reminded of this on September 11, 2017 when a cloud-to-ground lightning strike came uncomfortably close to a United Airline tug driver. Luckily, the tug driver was not harmed, but the results could have been a lot worse. Similar to the incident at Southwest Florida International, there were plenty of cloud-to-ground lightning strikes detected in the area by the Earth Networks Total Lightning Network prior to the strike.

Case 2 – Baltimore-Washington International Airport

Lightning strikes don’t only threaten the people and equipment on the ground. They also threaten those in air-traffic control towers. In 2013, a lightning strike hit the air-traffic control tower at Baltimore-Washington International Airport. This incident injured a worker and prompted the temporary closure of the tower. No air-traffic control tower, no air traffic. The lightning reached the worker through a panel that was not properly ground and that he was leaning up. While the worker survived the lightning strike, the airport was shut down for nearly 3 hours. Nearly 120 flights were canceled at BWI alone that day due to severe thunderstorms.

The State of Severe Weather at Airports & Best Practices

Based on responses to our 2019 Airport Weather Safety Audit, the current status of severe weather warnings regarding lightning at airports is troubling. In fact, most current protocols (or lack thereof) put everyone at risk. Over 20% of all respondents said they did not have a standard lightning radius they use to stop ground operations.

A bar graph showing the data from question 3 on the 2019 airport safety report showing at what distance lightning has to be from airports in order for respondents to stop ground operations.

The lowest distance lightning must be from an airport to stop operations per our survey was 3 miles. This seems to be the happy medium between safety and operational efficiency for most airports, however airport operations teams monitoring the weather should keep an eye on nearby storms outside of the safety radius as lightning bolts from the blue (i.e. bolts that extend from storm cells and strike when skies seem clear) can travel over 10 miles away from storm clouds

Lack of Reliable Monitoring Method

What’s more is that many airports, airlines, and FBOs do not have a reliable method of monitoring the weather. Sometimes, airport operations personnel make the call to stop operations based on observations of stormy weather or lightning flashes.

These decisions are obviously highly inaccurate and can put your colleagues in even more danger. The industry seems to recognize this, ranking automated phone calls the least effective when compared to other methods.

The answers to question 8 on the 2019 airport report ranking text alerts, horn, strobe lights, and automated phone calls on their effectiveness

Other widespread problems in the aviation industry include use of outdated warning systems, like lightning prediction systems (see why that’s a bad idea) or free weather applications that don’t always update or use the most accurate information.

DOWNLOAD: Free vs. Commercial Weather Data

Here are some important best practices for you follow if you want to minimize the risk of lightning disrupting your airport operations:

A red check mark with a transparent background Rely on total lightning detection (not prediction) and remember that a network-based system provides a more complete picture than a single-node system

A red check mark with a transparent background Have a severe weather safety plan that includes all parties at your airport with clear protocols for communication before, during, and after a severe weather event to help streamline the stop/resume procedures

A red check mark with a transparent background Utilize real-time weather data and lightning detection horns – two of the best severe weather safety tools to protect those on the ground, in towers, and in any other high-risk areas. While text alerts can be a good alternative, they are only effective if 100% of staff have their mobile phones on them.

Detect, Alert, Protect

Best Practice for lightning safety is to detect in-cloud and cloud-to-ground strikes, alert instantly to multiple devices, and protect with safety procedures

You can take advantage of all these best practices by remembering Detect, Alert, Protect. This is the overall best practice for dealing with severe weather at any workplace that operates outdoors in any capacity.


The best way to know if lightning is nearby is by using a lightning detection solution. The best lightning detection tools detect total lightning, the combination of in-cloud and cloud-to-ground lightning strikes, and are network-based. Using a system that is supported by a network, rather than just a single-node, is important in the event that severe weather damages your equipment or you want to track incoming storms farther away from your airport.

Chart comparing single-node lightning prediction and network based lightning detection. Single-note sounds alerts based off the possibility of storms while network-based alerts are in real time and lower false alarms. Single-node identifies electrostatic impulses only while network-based knows the exact location of storms. Single-node can trigger false alarms or no alarms at all while network-based knows accurate lightning locations. Single-node lightning prediction is the sole weather monitoring asset while network-based lightning detection is a network of lightning sensors. Single-note only has a 20 mile range while network-based can span countries (based on the network). Single-node generally has poor accuracy while network-based has a higher accuracy. Single-node typically only boasts cloud-to-ground prediction while network-based detects total lightning.
We have an entire reference document outlining the differences between lightning detection and prediction that you can access for more information.


If lightning flashes are within your warning zone, typically 10 miles of your location, you need to alert everyone at risk to seek shelter.

Graphic showing an example of total solution coverage rings with the airport location in the center-most red circle with a small orange circle outside that and a larger yellow circle surrounding it all.
Severe weather alerting has traditionally been a clunky, unreliable task. But unreliable is one of the last things you want to be in the case of severe weather approaching an airport. That’s why automated alerts are your golden ticket to operational safety. Any type of automated alert that relies on your lightning detection system is encouraged. Options range from horns or Outdoor Alerting Systems (OAS) to mobile alerts in the form of text messages, push notifications, and email.


Once you detect lightning and alert everyone following these best practices you can then protect all those at risk. Have a plan in place for what happens when your alerts go off that includes safety procedures for moving people to safe locations and securing property.

You can offer better protection by developing a protocol for each at risk party and reviewing it regularly, so everyone knows what to do and reacts quickly.

Weather tracking software also comes in handy when it comes to protecting individuals who are skeptical of the threat of severe weather. A real-time weather map will help you collaborate with different parties online and show them incoming dangers as they approach your location with data backed by highly accurate and targeted hyperlocal weather networks.

Commercial Weather Data Helps You Prepare for All Weather Scenarios

It is easy to understand your lightning risk and how to protect your organization, but it’s hard to attain complete lightning and severe weather safety if you’re using the wrong data. Earlier we mentioned there’s a problem with relying on free weather applications when it comes to making sound operational decisions. These apps might be good (sometimes) for figuring out what to wear in the morning, how long your commute is going to be, and if you can go for a run in the afternoon, but they just don’t make the cut when lives are on the line.

DOWNLOAD: Free vs. Commercial Weather Data

Aviation professionals require professional-grade, commercial weather data. Commercial weather data is superior to freely-available consumer weather data in four key areas:

Top Four Benefits of Commercial Weather Data

1. Accuracy – Quality commercial weather providers use weather data from professional systems rather than turning to weather stations owned and operated by everyday weather enthusiasts

2. Proximity – Commercial weather data is hyperlocal, which means it represents local conditions at and around your airport and other key locations

3. Granularity – Weather watchers receive a standard package when they rely on free data, but commercial weather data providers give key decision-makers with options and access to professional meteorologists for expert decision-support. With commercial weather data you get the weather information that matters most to your operations.

4. Real-Time Updates – Inclement weather can go from bad to worse in a matter of seconds. Commercial weather providers update in real-time, on average 50% faster than freely-available applications. Those extra minutes of advanced notice can save lives.

When you have the right tools in place from a commercial weather network, you can improve operations at your airport by eliminating false alarms, never missing real alarms, to keep people and equipment safe from severe weather.

In our 2019 Airport Operation Safety Audit, 40% of respondents indicated they were going to increase severe weather safety measures for their operations this year. There are dozens of airports all around the country that are currently using lightning safety systems and seeing the advantages. Let’s take a look at a few examples below and see how they compare to your systems and procedures.

If you don’t already have a lightning safety plan in place, this example should give you a good place to start.

DOWNLOAD NOW: 2019 Airport Operations Weather Safety Report

Example 1 – St. Pete Clearwater International Airport

St. Pete Clearwater International Airport (PIE) is a public/military airport in Pinellas County, Florida. Know as the “birthplace of commercial air transportation,” it is also a leader in the airport safety field. After growing discouraged by inaccurate reports and warnings from free weather apps (St. Pete Clearwater now utilizes a complete suite of weather intelligence products from Earth Networks.
Their comprehensive weather safety solution includes:

Red icon of a meteorologist with a tie onMeteorological support

Red icon of an online tab and a lightning symbolWeather tracking software

Red icon of a smart phone with a warning symbol on it representing an alertText message alerts

These tools come in handy nearly every day at Pie. In 2017, there were 283 cloud-to-ground lightning strikes at the airport. When you take in-cloud lightning into account, that brings the yearly total up to 4,423.

2017 Lightning Detect Report at PIE Airport showing at least 283 cloud-to-ground lightning strikes at the airport and 4,423 total lightning strikes at the airport in the year 2017

PIE detected these strikes with the help of Earth Networks and made better weather-related decisions which resulted in:

A red check mark with a transparent background Better on-time performance

A red check mark with a transparent background Streamlined operations

A red check mark with a transparent background Safety throughout the airport

Key Takeaways

We work with hundreds of other airports, airlines, FBOS, and air traffic control agencies to help them mitigate the risks of lightning and other severe weather events to their operations.

When searching for a weather intelligence company to power your safety and operational policies, look for the following features:

A lightning bolt icon that is multicolored with a gradient from red to yellow Automated, timely alerts that assist with making quick decisions

A lightning bolt icon that is multicolored with a gradient from red to yellow Network-based solutions that gives access to expert meteorologists and support

A lightning bolt icon that is multicolored with a gradient from red to yellow Accurate, cost-effective solution

A lightning bolt icon that is multicolored with a gradient from red to yellow Lightning detection, not prediction

A lightning bolt icon that is multicolored with a gradient from red to yellow Audible and visual alerts

A lightning bolt icon that is multicolored with a gradient from red to yellow Access to hyperlocal real-time weather observations on site

If you’re ready to combat lightning and other severe weather safety hazards, get in touch with the team at Earth Networks. We’ll craft a customized solution with your operations in mind to help you mitigate thunderstorms and other severe weather events.