Lightning & thunderstorm tracker

We flag any PA grid cell currently coded as thunderstorm (WMO 95–99) or carrying a thunderstorm-related NWS alert. Map refreshes every fifteen minutes; expect gaps on clear days.

Active strikes area—

Thunderstorm alerts—

Strongest cell—

Bolt markers indicate grid points currently reporting thunderstorm conditions. Red polygons show thunderstorm-related NWS watches and warnings.

Safety note

When thunder roars, go indoors

30/30 rule

If thunder follows lightning by 30 seconds or less, get inside. Stay there for 30 minutes after the last thunder.

Outdoor events

Baseball, soccer, outdoor pools: evacuate at the first flash within eight miles (24-second count).

Indoor safety

Stay off corded phones and away from windows. Avoid water and metal plumbing during a storm.

If caught outside

Move to low, dry ground. Avoid isolated trees, hilltops, and open fields. Never shelter under a shallow overhang.

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