There’s a specific moment where you know you waited too long. The sky has been building in the west for maybe twenty minutes, clouds stacking into that anvil shape you recognize if you’ve spent enough time outside in Florida. You told yourself you’d turn around at the next trail junction. Then the junction came and you kept going because you were feeling good and it was only 3 PM and surely you had time.

Then the wind shifts.

That’s the moment. After the wind shift you have maybe ten minutes.

This happened to me at Fort Clinch a few years back. I was running the loop out past the fishing pier, probably three miles from where I’d parked near the campground entrance. The clouds had been building since I left the trailhead but I was in that zone where everything feels effortless and you don’t want to break it. The humidity had been bad all morning but it had that pre-storm sweetness to it — the air heavier than usual, the Spanish moss hanging dead still.

Then the wind shifted. Northeast to west, sudden, like someone flipped a switch.

I turned around and ran. Didn’t matter. Got completely soaked about half a mile in. Lightning struck something in the park — I heard it more than saw it, that crack-boom that’s too close for comfort. I was under the live oaks at that point, which is exactly where you don’t want to be, so I pushed out to a maintenance road and found a small outbuilding to wait against. The lightning had already moved east toward the beach and the rain was just rain at that point, not a serious threat. But for a few minutes it was a little too close.

I stood there for forty-five minutes watching the storm pass. Got back to the car an hour late, completely soaked, wearing shoes that took two days to dry out and never fully recovered.

What I Actually Learned

The lesson isn’t “check the forecast.” I knew the forecast. Afternoon chance of thunderstorms, 40%. That’s basically every day in Florida from May through September. If you let it stop you from running you’d barely run at all.

The real lesson is about paying attention to the sky while you’re running, not just before you leave. Florida afternoon storms build fast — faster than most people who grew up somewhere with actual weather understand. You can watch a clear sky go to a full anvil in under an hour on a humid afternoon. The difference between a mild soaking and a dangerous lightning situation is usually the half-mile you talked yourself into running past your turnaround point.

A few habits I’ve developed since then:

When the clouds start stacking in the west, I start noting my distance from shelter — not just the car but anything substantial. At Fort Clinch that means the bathrooms near the beach parking lot, the maintenance buildings, the park office. Out on open beach there’s less to work with, which is part of why I prefer to do longer beach runs early in the morning during summer rather than afternoon.

If I’m doing an out-and-back and I see serious anvil formation, I turn around before my planned midpoint. A 6-mile run becoming 4.5 is always better than the alternative. And wind shift is my hard cutoff — not “the sky looks bad,” not “it might rain.” When the wind shifts directions suddenly, I’m done and moving toward shelter. No more negotiation with myself.

By July I’ve usually moved my longer runs to 6 AM start times, back well before 9. The window from roughly 2 to 6 PM is when these storms most consistently fire.

May Is When It Starts

The serious afternoon thunderstorm season runs June through August. But May is when the storms find their rhythm, and it’s easy to get caught out because you’re not mentally in summer mode yet. April running on Amelia Island can be nearly perfect — warm mornings, manageable humidity, the occasional afternoon shower but nothing dramatic. May starts to look similar but the sky has a different feel to it by mid-month. The cumulus clouds get taller.

If you’re visiting Amelia Island in May and planning long runs, keep an eye on the western sky after noon. The beach running here is excellent in the mornings before the sea breeze fully kicks in, and for runs longer than 8 or 9 miles that’s probably your best window if you’re not used to the humidity. The trail system at Fort Clinch adds some tree cover but it doesn’t protect you from lightning, and the trails out near the fishing pier are exposed enough that you’ll know when a storm is coming.

The practical upshot for May: morning runs are almost always clean. Afternoon runs over an hour need a weather check within the last two hours, not the night before.

The Shoes

For the record, the shoes that didn’t survive that Fort Clinch storm were an older pair of Hokas I’d been using for trail rotation — probably 400 miles on them. Two days of drying and the midsole cushioning had compressed unevenly. I could feel it in my left knee by the following week, which is how I eventually traced it back. These days I’m more careful about getting wet shoes fully dry before the next run. It’s easy to ignore when you’re staring at three other pairs you could use instead.

The storm itself became a good story pretty quickly. Nobody got hurt, I learned something real, and I’ve been watching the western sky on afternoon runs ever since. That feels like a fair trade.

May 1 on Amelia Island. The sky is clear this morning. By afternoon, I’ll be keeping an eye on it.