An EF1 tornado produces winds between 86 and 110 miles per hour (138 to 177 km/h) and is classified as “weak” on the Enhanced Fujita Scale, though that label is misleading. These tornadoes cause moderate structural damage to well-built homes and can completely destroy mobile homes. They’re strong enough to tear roofing off houses, shatter windows, and push parked cars sideways.
Where EF1 Falls on the Scale
The Enhanced Fujita (EF) Scale ranks tornadoes from EF0 to EF5 based on the damage they leave behind. An EF0 produces winds of 65 to 85 mph and typically breaks tree branches or damages signs. An EF1 picks up where that leaves off, starting at 86 mph and topping out at 110 mph. EF2 begins at 111 mph, where damage becomes considerably more severe.
Meteorologists don’t measure tornado wind speeds directly in most cases. Instead, survey teams examine the damage path after the tornado passes and match what they see to a set of standardized damage indicators: the condition of homes, trees, power lines, commercial buildings, and other structures. The pattern and severity of damage determines the rating. This means an EF1 rating is really a statement about what the tornado did, with wind speeds inferred from that destruction.
What EF1 Damage Looks Like
For a typical residential home, EF1 winds strip away portions of roof covering material, tear off gutters and awnings, and peel vinyl or metal siding from exterior walls. Windows and glass doors can shatter from wind pressure or flying debris. At the higher end of the EF1 range, sections of roof decking may lift away entirely, chimneys can collapse, and garage doors buckle inward or outward. Porches and carports are particularly vulnerable and may fail completely.
The damage is real but usually survivable for well-constructed buildings. A stick-built home with a properly secured roof will likely need significant repairs but remain standing. Older homes, structures with poor construction, and buildings that haven’t been maintained are more at risk of serious structural failure even at EF1 intensity. Trees with shallow root systems snap or topple, and large branches become dangerous projectiles.
Why Mobile Homes Are Especially Vulnerable
Mobile and manufactured homes are a different story entirely. The National Weather Service states plainly that even an EF1 tornado, despite its “weak” classification, will most likely severely damage a mobile home or roll it over. EF1 winds can completely destroy these structures. The lighter framing, elevated floor systems, and tie-down anchoring used in manufactured housing simply aren’t designed to withstand sustained winds above 80 or 90 mph, especially when combined with the sudden pressure changes and airborne debris inside a tornado.
This is why official safety guidance is unambiguous: you are not safe in a mobile home during a tornado of any strength, whether you’re in a hallway, closet, or bathroom. If you live in a mobile home in a tornado-prone area, the time to leave for a more substantial shelter is when a tornado watch is issued, not when a warning comes. The gap between a warning and the tornado’s arrival can be minutes or less.
What Happens to Vehicles
Research from the American Meteorological Society found that about one in three parked vehicles in an EF1 damage zone gets pushed sideways. At EF0 strength, only about 1 in 10 vehicles moves at all. So EF1 represents a meaningful jump in the force acting on a car or truck. Rolling or lofting (a vehicle flipping or becoming airborne) is rare at EF1 intensity, happening to roughly 1 in 25 vehicles at EF2 or below. But lateral sliding is common enough that survey teams now use it as a clue: if a vehicle has been shifted from where it was parked, the winds were likely EF1 or higher.
This matters practically because some people consider riding out a tornado in their car. A vehicle offers very little protection from flying debris, and at EF1 speeds, the car itself may start moving in ways you can’t control.
How to Shelter During an EF1 Tornado
The safest place is completely underground. If you have a storm cellar with a securely fastened door, that’s your best option. A basement works well too, though you should stay away from outside-facing doors and windows and get under a stairwell or sturdy piece of furniture to protect against falling objects from the floor above.
A reinforced above-ground safe room is nearly as effective as an underground shelter. If you don’t have either, the goal is to put as many walls between you and the outside as possible. Move to the lowest floor, find a small interior room (a bathroom without exterior walls or windows, an interior closet, or a hallway deep inside the building), and close every door between you and the exterior. Each closed door acts as another barrier against wind and debris. Cover yourself with pillows, blankets, or coats, and wear a helmet if you have one.
In apartment buildings, get to the lowest floor you can reach. Some complexes designate the clubhouse or laundry room as shelter areas. In stores, malls, or restaurants, move to interior spaces and away from large glass windows or exterior walls. The principle is always the same: low, interior, small, and covered.
EF1 in Context
EF1 tornadoes are among the most common tornado ratings. The majority of tornadoes that touch down in the United States each year are rated EF0 or EF1. They’re survivable in well-built structures, and most injuries come from flying debris rather than structural collapse. But the “weak” label on the Enhanced Fujita Scale creates a false sense of security. Winds at 100 mph are launching shingles, siding, and tree branches through the air at lethal speeds. For anyone in a mobile home, a vehicle, or caught outdoors, an EF1 tornado is a life-threatening event.