Minnesota knows both kinds of wind disaster. Tornadoes have left their mark on Fridley in 1965, St. Peter and Comfrey in 1998, Hugo in 2008, Wadena in 2010 and North Minneapolis in 2011. Straight-line windstorms have done the same, from the July 4, 1999 Boundary Waters derecho that flattened millions of trees to the May 12, 2022 derecho that swept across southern Minnesota. For insurance purposes, both are usually “windstorm,” but the damage they cause, and the way claims unfold, can be quite different.
What makes a derecho different
A derecho is a long-lived, widespread windstorm driven by a line of thunderstorms. Its winds blow in a broadly consistent direction, which is why it is called straight-line wind. Gusts can rival a weak tornado, and the damage path can stretch for hundreds of miles.
Typical derecho damage
- Shingles lifted, creased or blown off, mostly on slopes facing the wind
- Siding panels pulled loose on the windward elevations
- Large trees uprooted or snapped, often falling in the same direction
- Fences, sheds and outbuildings pushed over
- Widespread power outages that lead to spoiled food and sump pump failures
Because damage is spread over a wide area, contractors and adjusters can be stretched thin for months after a major derecho.
What makes a tornado different
A tornado is a rotating column of air with a narrower, more intense path. Damage can vary dramatically from one house to the next, and debris is often thrown in multiple directions.
Typical tornado damage
- Roofs partially or completely removed
- Walls shifted off foundations or collapsed
- Windows broken by flying debris on several sides of a building
- Structural racking that may not be obvious from the outside
- Debris from neighboring properties embedded in walls and roofs
Tornado losses tend to be larger per property and more likely to involve structural engineering, code upgrades and extended loss of use.
Why the difference matters for a claim
Most homeowners policies cover windstorm, whether straight-line or tornadic. But the pattern of damage affects how the claim is scoped and argued.
- Scope. Derecho claims often turn on how many slopes and elevations were affected. Tornado claims more often turn on structural repair versus replacement.
- Causation. With straight-line winds, the insurer may argue that damage on leeward sides is unrelated. Documentation of wind direction and debris helps.
- Code upgrades. Major tornado repairs frequently trigger building code requirements, making ordinance or law coverage important.
- Loss of use. Tornado losses more often make a home unlivable, bringing additional living expense into play.
Wind and hail deductibles
Minnesota has no state wind pool; wind is generally covered in the standard homeowners policy. However, many policies include a separate wind or hail deductible, sometimes stated as a percentage of the dwelling limit instead of a flat dollar amount.
An illustrative example: on a home with a $400,000 dwelling limit and a 1 percent wind deductible, the deductible would be $4,000. At 2 percent, it would be $8,000. Check your declarations page for the exact terms. The deductible applies once per occurrence, so how the storm event is defined can matter if damage happened over more than one day.
Documenting a wind claim
- Photograph all four elevations of the house and every outbuilding.
- Photograph fallen trees and the direction they fell.
- Collect debris that came from your roof or siding, and note where you found it.
- Save receipts for tree removal, tarping and board-up.
- Keep a log of any time spent living elsewhere.
If your home sits in an area hit by a broad derecho, also note neighbors’ damage and any city debris pickup notices. That context helps show the scale of the event and supports a consistent date of loss. For a tornado, photograph the debris field and any engineer or building inspector tags placed on the structure.
Tree removal coverage often has its own limits and conditions, so check how your policy treats trees that hit a structure versus those that fell in the yard.
Common estimate disputes after wind
After a large derecho, adjusters working heavy caseloads may write estimates that repair a few shingles instead of whole slopes, omit siding on elevations they did not photograph or skip interior damage from rain driven through openings. After a tornado, disputes tend to involve structural scope, engineering, and whether framing can be repaired. Minnesota Insurance Appraiser handles both kinds of claims; our tornado and derecho wind appraisal page explains our approach.
When appraisal helps
If the insurer has accepted the wind claim and the disagreement is about how much damage there is or what repairs cost, appraisal can resolve it. If the insurer has denied the claim, for instance by attributing damage to wear rather than wind, the dispute may involve coverage and is better discussed with an attorney. The appraisal process guide outlines each step.