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“It’s hard because we’re in a dry spell right now and the area has experienced very violent, heavy downpours,” Mr. Gischlar said. “Something like these types of storms, they bring very violent, hot and hazy weather. And with a cold front, it does nothing but make vicious thunderstorms.

The problem then, Mr. Gischlar explained, is that with the right combination, not even healthy trees are safe.

“With the right conditions — even a healthy tree — they’re going to fall,” Mr. Gischlar said. “We do everything we can to keep that from happening.”

The odds of a tree falling on a person and killing them are pretty small, Mr. Bloch said, “but when it happens, it’s big news.”

The derecho was a kind of storm he had never seen. Couple that with the fact that severe weather, such as thunderstorms, tend to happen more frequently in the summer, and tree problems likely are not over for area residents.

“Any time you have a storm event like that, those trees crash down and they’re gone,” said Scott Aker, who is the head of horticulture at the National Arboretum. “But storm events like that also do some more subtle damage to trees.”

Mr. Aker said it is a good idea for homeowners after a bad storm to have their trees assessed by a certified arborist.

An arborist can check to see if the branches and top of the tree are balanced, can check the root system, and look for small cracks that are hard for untrained eyes to see.

Homeowners can do some review, such as looking for any obvious leaning or breakage, or thumping a rubber mallet against the trunk to determine if it is hollow — a sign of decay.

“It’s the smart thing to do right now,” Mr. Aker said. “You can look yourself, but it’s better to have a certified arborist. It’s worth every penny. It’s so much nicer to take [a tree down], instead of having it come down on your house or car.”

Does insurance cover it?

Considering standard insurance policies, however, homeowners may prefer to have a tree fall on their deck instead of their daisies.

According to Michael Barry, a spokesman for the Insurance Information Institute, standard homeowner insurance policies cover trees that fall on any structure, such as a house, garage or shed. If a tree simply falls in a yard, the policy likely doesn’t cover the clean-up unless it’s blocking a driveway.

“Wind, fire, and theft are the three core coverages,” Mr. Barry said. “Homeowners insurance covers every structure on your property.”

The same goes for car damage. Mr. Barry said anyone with comprehensive insurance — which roughly 80 percent of policy holders carry — is covered.

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