EF0

EF0 is the lowest category on the Enhanced Fujita (EF) scale, which is used to classify tornadoes and wind events by the damage they cause. The EF scale was introduced in 2007 to improve damage assessments over the original Fujita scale, and it is used by the National Weather Service and other meteorological agencies in the United States and elsewhere when surveying tornado damage.

An EF0 tornado is associated with estimated wind speeds of 65 to 85 miles per hour (105 to 137 kilometers per hour). The damage described for this category is light. Typical effects include minor roof damage such as loose shingles or gutters, shallow damage to siding, and fascia; small trees with shallow roots may be toppled, and branches can break. Signs, fences, and occasionally unsecured light poles or similar lightweight structures may be damaged. Vehicles are usually not displaced, though they may be moved by debris in some cases.

Ratings are determined after on-site surveys that compare observed damage to standardized damage indicators and construction practices. Because wind speeds are not directly measured over wide areas during tornadoes, the EF rating reflects the damage observed rather than an exact wind measurement. Construction quality, weather conditions, and the type of built environment influence how damage translates to a specific EF rating.

EF0 tornadoes, while the weakest on the scale, can still pose hazards and cause injury or localized property damage, especially in areas with vulnerable or poorly anchored structures. They are among the more common tornado intensities and often serve as signals of broader storm systems, though not all tornadoes are rated beyond EF0.