Duncan Hail — Storm History & NOAA Data for Duncan, OK

Data current as of 2026-10-16 · Sourced from NOAA Storm Events

Over the past five years, the National Oceanic and Atmospheric Administration has recorded 145 hail storms within 25 miles of Duncan, OK. Of those, 121 produced hail at least quarter-size — the threshold most insurance carriers consider potentially damaging to asphalt shingles. The largest reported hail in this window was egg-sized, which can fracture shingle mat and dent metal flashing on contact. 2026 was the most active year on record locally, with 50 documented hail events.

Hail Severity Breakdown — Duncan Area (Last 5 Years)

Duncan Hail Storms by Year

2026 was the busiest hail year on record locally for Duncan, with 50 documented events inside the 25-mile radius. Storm activity in Duncan typically peaks in spring and early summer, when the jet stream pushes Gulf moisture into the area and supercell thunderstorms become more frequent.

Notable Recent Duncan Hail Storms

• August 8, 2026 — Significant hail (quarter-sized or larger) reported near Waurika. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Duncan-area properties.
• July 5, 2026 — Significant hail (quarter-sized or larger) reported near 1 SW Marlow. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Duncan-area properties.
• May 9, 2026 — Significant hail (quarter-sized or larger) reported near 7 E Waurika. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Duncan-area properties.
• May 9, 2026 — Significant hail (quarter-sized or larger) reported near 2 SW Comanche. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Duncan-area properties.
• May 9, 2026 — Significant hail (quarter-sized or larger) reported near 2 SW Comanche. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Duncan-area properties.

Recent Hail Events Near Duncan

Wind Storm History — Duncan Area (Last 5 Years)

NOAA has recorded 90 high-wind events within 25 miles of Duncan, OK in the past five years. Of those, 90 reached severe-thunderstorm thresholds (58+ mph). The highest measured gust was 90 mph.

Recent Wind Events Near Duncan

Frequently Asked Questions About Duncan Hail

When was the last major hail storm in Duncan, OK?

The most recent quarter-size-or-larger hail storm recorded by NOAA within 25 miles of Duncan was on August 8, 2026. HailCheck refreshes from the NOAA Storm Events database daily, so newer events appear here as they are reported.

How often does it hail in Duncan?

Duncan averages roughly 29 reported hail events per year within a 25-mile radius. Significant storms (quarter-size or larger) account for 121 of the 145 events recorded over the last five years.

How big does hail typically get in Duncan?

The largest documented hail near Duncan in the last five years was egg-sized. Most Duncan-area hail falls in the marble-to-quarter range, with destructive storms (egg-size or larger) appearing roughly once every few years.

Does my insurance cover hail damage in OK?

Most homeowners insurance policies in OK cover hail damage to roofs, siding, and gutters under the dwelling and other-structures coverage. Coverage typically requires the damage to be tied to a verifiable storm date — which is where the NOAA hail history above (and a HAAG-style test square validation) becomes important for the claim file.

How do I check hail history for a specific Duncan address?

Use the HailCheck address search to enter any street address in or near Duncan. HailCheck returns every NOAA hail event within a configurable radius, along with severity bands, dates, and storm narratives for Pro members.

What a HAAG-Style Test Square Validation Means in Duncan

If your property in or near Duncan took on hail during one of the storms above, the standard process for documenting damage is a 10×10 foot test square inspection. A HAAG-trained reviewer counts impact indicators — granule displacement, mat fractures, and bruising — within the marked square and produces a PASS or FAIL document for the claim file.

HailCheck offers a $99 photo-based HAAG-style test square validation. You submit photos from the field, our reviewer evaluates the impact indicators and cross-references the NOAA storm dates listed above, and a written PASS/FAIL determination is returned within one business day. We do not send anyone to the roof — the validation is built around the photos you submit.

Why Duncan's Location Matters for Hail

Duncan sits inside the central United States hail belt, where warm Gulf moisture collides with cold continental air to produce supercell thunderstorms capable of dropping the hail documented above. Properties in this zone typically see at least one significant hail event every two to four years.

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