How to Find Hail and Storm History for a Commercial Property

Confirm the building location, including its county, state and approximate coordinates. For multi-building complexes, choose the particular structure you are researching. Then define the dates: the past twelve months for recent outreach, or the years since the last known major roof project for a longer property history.

Write down the roof's installation or reroof date if supported by records. A hail event in 2017 is not relevant to the current membrane in the same way if a verified full replacement occurred in 2021. This simple timeline check prevents a storm-history report from exaggerating exposure.

The NOAA National Centers for Environmental Information Storm Events Database provides historical National Weather Service storm reports. The current search supports map and state/county approaches and can filter by event type and date. For hail research, select the relevant county and hail event type; for wind research, look for thunderstorm-wind reports and related entries.

Review the event date, location description, magnitude where supplied, and the narrative. A hail-size entry describes the report, not a measured impact on your customer's roof. Read location details instead of assuming every event plotted within a wide area passed directly over the building.

NOAA also warns about differences in source quality and coordinate precision. Reports can come from trained observers, public agencies and other sources. An event may be documented with an approximate location or a narrative that does not establish the path of every storm cell.

The Storm Events Database is a historical archive. New reports pass through collection and validation before publication. NOAA explains that this process commonly takes roughly three months after the event month. For a storm that happened yesterday, an empty archived search result is expected and does not mean the event did not occur.

For recent activity, consult the responsible National Weather Service forecast office and its local storm reports. Record the report timestamp and whether details are preliminary. A later archived record may use revised descriptions or measurements.

ZIP codes are built for mail delivery, not meteorology. A single ZIP can include substantial geographic variation; county-level entries cover even larger areas. When possible, compare the reported location with the actual property and look for a credible account of how the storm moved across the area.

Keep an evidence table with:

• property address and coordinates;
• storm date and local time;
• reporting agency and event type;
• reported hail size or wind speed, where available;
• location description and approximate distance;
• source URL and retrieval date;
• confidence notes and unanswered questions.

Avoid marking a roof “hit by 1.75-inch hail” just because a nearby report contains that number. A better label is “1.75-inch hail reported near the property on [date]; property-level exposure unverified.”

Weather evidence becomes more meaningful when connected to documented roofing work. Suppose a warehouse has an older roof, no confirmed major reroof in the available permit record, and two local hail reports since its last inspection. That combination is a sensible reason to review the building. It remains an insufficient basis to claim damage or an insurance loss.

Also consider roof design and system type. Edge metal, rooftop equipment, membranes, skylights and previously repaired details may respond differently to the same weather. A storm report cannot replace an assessment of the actual assembly.

The CapXos storm and roof damage guide provides regional context. Its commercial roofing market pages combine roof and permit data in supported areas. Use these sources to shortlist properties, then confirm important weather details in the official records and the roof's current condition on site.

Before traveling, capture the relevant event sources and property identification. During the roof walk, document the roof sections examined, photographed conditions, inaccessible areas and whether there is any basis for further testing. CapXos Inspect is available as a free web tool for photographs and observations associated with roof sections. It can support the field documentation, while the actual damage assessment remains the responsibility of qualified personnel.

Never substitute event data for an inspection. The National Weather Service defines severe thunderstorms partly by hail of at least one inch or wind gusts of around 58 mph, but that threshold classifies a storm. It is not a roof-damage threshold for every roofing material.