Validation · field-tested

How early can it warn you?

We don't just claim accuracy — we measure it. We replayed a real severe-weather outbreak straight from the archives and scored our lightning logic against satellite-detected lightning. Here's how it did.

~1 hr

average lead time

before lightning reaches you

6 hr

longest lead

on long-tracked storms

5 regions

tested

Texas to Florida to the Midwest

1.4M+

real flashes

scored against satellite truth

The headline result

Time to get to safety

For every location that was eventually struck, we measured how far ahead the app first raised a lightning watch or approaching alert. That gap is the time you'd have to act. We ran it on five outbreaks in different parts of the country:

Outbreak	Region	Median lead	Average lead	Longest lead
Jun 2, 2026	East Texas (Southern Plains)	30 min	59 min	5.8 hr
Jun 19, 2026	Lower Mississippi Valley	15 min	56 min	6.0 hr
Jun 21, 2026	Indiana & Illinois	55 min	76 min	5.6 hr
Jun 24, 2026	Eastern Iowa (Upper Midwest)	70 min	74 min	5.8 hr
Jun 24, 2026	Florida peninsula	60 min	70 min	5.8 hr
Across all five events			~65 min average	up to 6 hr

Lead time depends on how a storm behaves: an organized line marching in from a distance (June 21) gives far more warning than fast pop-up convection developing nearly overhead (June 19). Either way, you're alerted before it reaches your 10-mile ring.

The test

Replaying a real outbreak, minute by minute

Backtesting means re-running the app's exact lightning logic over a past storm and checking it against what actually happened — using an independent source of truth.

The events: Five severe thunderstorm outbreaks in different regions — East Texas (Jun 2), the lower Mississippi Valley (Jun 19), Indiana & Illinois (Jun 21), eastern Iowa (Jun 24), and the Florida peninsula (Jun 24), 2026 — each a 6-hour window.
Ground truth: Independent satellite lightning detection — nearly 1.5 million real flashes across the windows, recorded separately from anything the app computes.
Model input: Archived high-resolution weather-model forecasts, fed through the exact production logic.
Coverage: ~2,250 grid points across the five regions, scored every 5 minutes.
What we score: For every point and time: did we raise the alert before lightning actually arrived — and how far ahead?

1,462,722 lightning flashes ~2,250 grid points 5 regions 30 hrs replayed satellite-verified truth

Built to be trusted

Alerts worth acting on

A warning is only useful if you can trust it. Two design choices keep Before It Strikes' lightning alerts meaningful — not noisy.

🎯

“Approaching” means it's coming to you

The approaching alert only fires when a storm is genuinely closing in on you — never when it's stationary or moving away. So when you get the heads-up, it's one worth acting on, not just noise from a storm that's passing by.

⚖️

An honest chance

The lightning “chance” is calibrated to your exact location, so a distant threat never overstates your risk. High confidence is reserved for real, nearby lightning — the number you see reflects the threat where you actually are.

How we keep it honest

The fine print — because safety

Read the numbers with these caveats

Five events so far. These figures come from five large, well-observed outbreaks in different regions. We re-run this analysis on more events as we tune — the numbers will keep moving.
Lead time varies with the storm. Fast-developing or near-overhead convection gives less warning than an organized line approaching from a distance — that's physics, not the app.
Truth source. Lead time is measured against independent satellite-detected lightning, separate from the app's own calculations. Lead time is the gap between our first alert at a location and the first strike within its 10-mile safety ring.

Before It Strikes surfaces official National Weather Service products as the authoritative source of truth. The lightning features described here are experimental situational awareness only and must never be used in place of official warnings or lightning-safety guidance. When in doubt, seek shelter.

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