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A single overnight hail event across the Twin Cities metro can generate tens of thousands of claims before the storm cell has even cleared the state line. Roof damage, siding pitting, and vehicle losses arrive in a compressed window, and carriers who ordinarily handle claims with a modest regional staff suddenly need far more hands than they have on payroll. This is the origin of the catastrophe, or CAT, response team: a mobile pool of independent adjusters, appraisers, and support staff that carriers activate and deploy to a declared event area for a defined period.

CAT staffing works differently from day-to-day claims handling. Independent adjusting firms maintain rosters of licensed adjusters who travel from state to state as storm seasons shift, following hail alleys through the Plains and Midwest in spring and summer and wind events along the coasts later in the year. When a carrier declares a catastrophe, it typically stands up a temporary command structure, assigns a CAT coordinator, and pushes a surge of adjusters into the affected zip codes within days. Minnesota and the surrounding states see this rhythm regularly, since hail swaths from a single supercell can cross several counties and produce claim volumes that dwarf a normal month.

The speed of a CAT response creates real tradeoffs. Adjusters working a surge event are often unfamiliar with local construction practices, regional material costs, and the specific roofing and siding products common to a given market. A field inspection completed in twenty minutes under a compressed schedule may miss matching issues on a discontinued siding profile or underestimate the labor required to work on a steep pitch in winter conditions. None of this reflects bad faith on anyone’s part; it is simply the operational reality of handling volume that exceeds normal capacity. It does, however, help explain why disagreements about scope and cost surface more often after catastrophe events than after isolated, single-property losses.

When those disagreements cannot be resolved through the normal claims process, the appraisal clause found in most property policies becomes relevant. Appraisal exists precisely for situations where the parties agree a covered loss occurred but disagree on the amount of loss. A carrier managing a large CAT caseload benefits from having appraisal available as a defined, contractual mechanism rather than defaulting every unresolved estimate dispute into litigation, which would overwhelm both the claims department and the courts in a storm-heavy year. An appraiser working these files after a catastrophe often sees the same recurring issues: differing measurements of roof area, disagreement over whether hail impacts are functional damage or cosmetic, and differing assumptions about code-required underlayment or ice and water shield coverage in cold climates.

Staffing surges also affect timing. During an active CAT season, adjusters, estimators, and appraisers alike are working full schedules across multiple assignments, and turnaround times that would be routine in a quiet month can stretch during a heavy one. Understanding this operational context helps everyone involved, from the policyholder waiting on a roof repair before winter to the carrier managing thousands of open files, set realistic expectations about scheduling and communication during periods of high storm activity.

The material above is general education about how property insurance appraisal commonly works, not legal advice; specific procedures differ by state and policy.

Russ Lis is a working property insurance appraiser and umpire based in Minnesota, serving clients nationwide. Contact Appraisal Resolution.