Google AI results (By the way, don't you wish you had employees and friends like google Ai! Always asking if it can go a step further! How it can help a little more.)
Lightning often strikes during a lull in the rain because heavy downpours physically mask or actively suppress the electrical pathway needed for a strike to reach the ground. While you are correct that the movement of rain alters the charge differential between the sky and the ground, it does not work by increasing the charge to trigger lightning. Rather, heavy rain creates a counter-effect that can delay or shift where lightning hits. [1, 2, 3, 4]
How Rain Affects the Charge Differential
Your intuition about rain changing the electrical charge is grounded in real physics, but the interaction is complex:
Rain reduces the ground-sky potential: As rain falls, it carries a small amount of electrical charge with it down to Earth. This action actually bleeds off some of the electrical tension, slowly reducing the extreme charge differential between the cloud base and the ground.
The main engine is inside the cloud: The massive voltage difference that triggers lightning is generated primarily by turbulent winds inside the cloud churning ice, hail, and water droplets together. Rain falling to the ground is a byproduct of this engine, not the primary creator of the electrical field. [6, 7, 8, 9]
Why the Lull is the Sweet Spot for Lightning
If the heaviest rain isn't causing the most lightning, a lull creates the perfect conditions for a strike due to several distinct factors:
Electrical Insulation Breakdown: Heavy rain acts as a dense, chaotic column of water. While water conducts electricity, a massive sheet of falling rain can disrupt and scatter the delicate, invisible "stepped leaders" (the initial paths of ionized air) trying to establish a clean circuit from the cloud to the ground. When the rain slacks off, the air stabilizes enough for a conductive path to successfully punch through.
The "Bolt from the Blue" Effect: Thunderstorms are highly tilted by high-altitude winds. The heaviest rain falls directly beneath the storm's core, but the highest electrical accumulation is often pushed to the sides or the upper "anvil" of the cloud. When you experience a lull in the rain, you are likely standing on the periphery of the storm core. This area is no longer shielded by the negative charges at the base, allowing massive, highly dangerous positive lightning to strike directly into the dry or lightly raining zones.
The Sound Barrier: During torrential rain, the sheer volume of water hitting the ground, roofs, and trees creates a massive wall of white noise. When the rain lulls, the background noise drops dramatically, making the sharp cracks and deep rumbles of thunder suddenly much louder and more noticeable, giving the illusion that the lightning just started.
If you are tracking a storm and want to know how to stay safe, I can provide information on how to estimate a storm's distance using the time between flashes and thunder, or explain the difference between positive and negative lightning strikes. Which would you find more helpful? [11, 14]
AI responses may include mistakes.
[1] http://lightningsafetycouncil.org/LSC-Science-Detailed.html
[2] https://www.weather.gov/safety/lightning-science-overview
[3] https://physics.stackexchange.com/questions/652751/why-doesnt-lightning-stop-when-it-starts-raining
[4] https://physics.stackexchange.com/questions/652751/why-doesnt-lightning-stop-when-it-starts-raining
[5] https://physics.stackexchange.com/questions/652751/why-doesnt-lightning-stop-when-it-starts-raining
[6] https://www.weather.gov/safety/lightning-science-electrification
[7] https://www.nytimes.com/2012/08/07/science/how-do-lightning-and-rain-coexist.html
[8] https://www.nesdis.noaa.gov/about/k-12-education/severe-weather/what-causes-lightning-and-thunder
[9] https://www.reddit.com/r/explainlikeimfive/comments/1vklmw1/eli5_why_does_rain_cause_lighting/
[10] https://www.youtube.com/watch?v=JmbaFrh04J0
[11] https://www.noaa.gov/jetstream/lightning/positive-and-negative-side-of-lightning
[12] https://www.quora.com/Why-does-lightning-fall-when-it-rains
[13] https://www.noaa.gov/jetstream/lightning/positive-and-negative-side-of-lightning
[14] https://www.youtube.com/watch?v=gDuz_1AIgjo&vl=en-US
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