Tornado Watch and Severe Storms Across Maryland Today — What It Means for Your Trees

If you are in Rockville, Bethesda, Potomac, or anywhere else across Montgomery County this afternoon, you are under an active Tornado Watch. The National Weather Service issued the watch at 4:21 p.m. today, upgrading an earlier Severe Thunderstorm Watch that already covered most of the state. It runs until 10 p.m. tonight and takes in 19 Maryland counties along with the District and parts of Northern Virginia.

This is the kind of setup that keeps our emergency crews busy through the night, so we want to get practical information in front of homeowners while the storms are still moving in rather than after the fact.

What Is In Effect Right Now

• Tornado Watch — in effect until 10 p.m. tonight for Montgomery County and 18 other Maryland counties, plus Washington, D.C. and parts of Northern Virginia.
• Severe Thunderstorm Watch — issued earlier today for most of Maryland, covering 22 counties and Baltimore City, also running through 10 p.m.
• Flood Watch — in effect for portions of Maryland into early Wednesday morning.

A watch is not a warning. A watch means conditions are favorable for severe weather to develop, so this is your window to prepare. A warning means it is happening in your area and you need to take shelter immediately. Because these alerts change quickly, always check the National Weather Service or your county alert system for the current status before acting on anything you read here.

The Threats Forecasters Are Calling Out

• Scattered wind gusts up to 70 mph.
• A few tornadoes possible across the watch area.
• Isolated hail up to ping pong ball size.
• Rainfall rates of 1 to 2 inches per hour, with higher totals in isolated spots.

The NWS timeline put the first storms arriving around 4 p.m., right at the start of the afternoon commute. Urban stretches along the I-95 corridor and any area that has already taken heavy rain in recent days are the most vulnerable to flooding, which can come up fast in low-lying spots, along creeks and streams, and in neighborhoods with poor drainage.

Why 70 MPH Gusts Are the Number That Matters for Trees

A healthy, well-structured tree can take a lot of wind. The trees that come down in a storm like tonight's are almost never the ones nobody worried about — they are the ones already carrying a defect. Dead limbs, a co-dominant trunk with a tight V-shaped union, hidden internal decay, or a canopy so dense that it catches wind like a sail instead of letting it pass through.

Sustained gusts in the 60 to 70 mph range are where large limbs start to fail and where compromised trunks give way. That is squarely in the range forecast for tonight.

Saturated Ground Is the Other Half of the Problem

One to two inches of rain per hour does something specific and dangerous: it turns the soil around a root plate into mud. Waterlogged ground loosens a tree's grip on the earth, and that is why you will sometimes see a large, apparently healthy tree uproot completely in a storm that did not seem severe enough to bring it down. The wind did not get stronger — the ground got weaker.

Trees on slopes, trees with roots cut by past construction or trenching, and shallow-rooted species are the first to go once the soil gives.

What to Do While the Storms Move Through

1. Get inside and stay away from windows. Under a Tornado Watch, know where your safe room is — lowest floor, interior room, no windows.
2. Do not park under large trees, and move vehicles out from under overhanging limbs if you can do it safely before the storms arrive.
3. Bring in or secure anything loose in the yard — furniture, umbrellas, trampolines, trash bins. In 70 mph wind these become projectiles.
4. Never go outside to inspect a tree mid-storm. There is nothing you can do in the moment that is worth the risk.
5. Do not drive through flooded roadways. Montgomery County has plenty of low crossings that go under fast in this kind of rainfall.
6. Charge your phone and keep a flashlight handy in case the power goes out.

What to Check Once It Passes

Wait until the watch expires and conditions are genuinely calm before you go out. Then walk your property in daylight if you can and look for the following.

1. Downed power lines. Treat every line as live. Stay far back, keep children and pets away, and call 911 and your utility. Never attempt to move a limb that is touching a line.
2. Fresh lean. A tree that is suddenly leaning, or soil heaved and cracked on one side of the trunk, means the root plate has shifted. That tree is not stable, even though it is still standing.
3. Hanging limbs. Broken branches caught up in the canopy are the classic post-storm hazard — they can drop hours or days later with no warning.
4. Split trunks or torn branch unions. Look for fresh, pale wood exposed where bark has pulled away.
5. Trees on structures. If anything is resting on your house, garage, fence, or vehicle, do not try to remove it yourself.
6. Photograph everything before any cleanup begins. Your insurer will want it.

When to Call for Emergency Help Instead of Handling It Yourself

Cleanup that involves a chainsaw at height, a tree under tension, anything near a power line, or anything resting on a structure is not a homeowner job. Storm-damaged wood is under load in ways that are not obvious from the ground, and it moves unpredictably the moment you cut it. This is the single most common way people get seriously hurt after a storm.

Rock Creek Tree, Turf & Landscape runs 24/7 emergency response across Rockville and Montgomery County. We are fully licensed and insured, and we have the cranes and equipment to take a tree off a house safely rather than making the damage worse.

After Tonight: The Trees That Made It Through

A tree that survives one severe storm is not automatically fine. Every event like tonight's leaves behind cracked unions, partially torn roots, and stress damage that will not show up until the next round of wind. If your property took a beating, a post-storm inspection is worth doing before the next system comes through — we are still in the heart of Maryland's severe weather season.

Stay safe tonight, keep an eye on official alerts, and call us if a tree comes down. We will be out there.