Waterloo is not hail alley, but it is not exempt either — the area averages about 5 hail-producing storms a year. When a cell does track over the county, the reports below tell you the date, the stone size, and how close it came.
Waterloo's Storm-Climate Context
Waterloo endures one of the widest thermal ranges in Iowa. The record high reached 112 F on July 13-14, 1936, and the record low bottomed at -34 F on March 1, 1962 and again on January 16, 2009 -- a wide swing that cyclically stresses roof membranes, flashing, and caulking. Average annual snowfall of 35.3 inches over roughly 27 snow days creates cumulative snow-load risk and prolonged freeze-thaw cycling. The June 2008 Cedar River flood -- the worst flooding the Waterloo-Cedar Falls area had ever recorded, with peak discharge of 112,000 cubic feet per second -- demonstrated how severe weather events can damage fascia, soffits, and low-slope commercial roofs alongside structural damage.
Waterloo's 2020 census population was 67,314, making it Iowa's eighth-largest city. John Deere remains the top employer at 4,300 workers, followed by UnityPoint Health (3,805) and Tyson Foods (2,969). The large manufacturing and meatpacking base sustains industrial and commercial roofing demand, while healthcare expansion signals ongoing institutional construction. The city's aging housing stock supports a repair and replacement market for residential contractors.
Hail Events Near Waterloo by Date
August 7, 2026 — 3 reports, hail up to 1.75″ (golf-ball size)
| Time (UTC) | Hail size | Location | Distance from Waterloo |
|---|---|---|---|
| 2115 | 1.75″ | Fairbank, Buchanan County | 18.0 mi |
| 2058 | 1.25″ | 5 SE Readlyn, Black Hawk County | 13.1 mi |
| 2102 | 1.25″ | 5 N Dunkerton, Black Hawk County | 13.8 mi |
Preliminary Local Storm Reports from the NOAA Storm Prediction Center. Sizes are reported hailstone diameters; times are UTC. Reports can be added or corrected for about a day after each event. A quiet page section ≠ no hail — smaller or unreported events happen. The closest report in this window landed 13.1 miles from Waterloo's center.
View these 3 reports on a map
Circle positions are the NOAA SPC report coordinates; tap a circle for the date and hail size.
Hail size: < 1″ 1–1.75″ ≥ 2″ not recorded
How Severe Was It? The NWS Yardstick, Applied to Waterloo's Reports
The National Weather Service calls hail severe at 1″ (quarter size) and significant at 2″ (hen-egg size). Scoring the 3 Waterloo-area reports (filed in Black Hawk, Buchanan Counties) against that scale: 3 of them met the severe 1″+ criterion — the size at which asphalt shingles start taking granule loss and bruising that shows up as leaks a season later. Damage at these sizes is rarely visible from the ground but is typically covered by homeowners insurance when documented promptly.
What to Do If Your Roof Was in the Hail Path
- Do a ground-level walk-around. Hail is rare enough around Waterloo that most homeowners never think to check — look for granules collecting at downspouts, dented gutters or screens, and battered plants after the August 7, 2026 reports above. Stay off the roof itself.
- Photograph anything suspicious with dates. Even minor-looking marks matter later: this NOAA log plus dated photos connect the damage to a covered storm event instead of "gradual wear", which insurers exclude.
- Book a free inspection rather than guessing. Bruised shingles and granule loss are invisible from the ground; a written scope from a local roofer settles whether there is a claim at all.
- Only involve the insurer once you know the scope. If the inspection finds nothing, you have lost nothing; if it finds damage, file within your policy's window while the event date is easy to prove.
- Bring the written scope to the adjuster. Full walkthrough in the roof insurance claim guide.
Hail History in Waterloo — the 10-Year Picture
The county behind Waterloo has logged 51 hail events over the last decade — a pace of roughly 5 per year — with the most severe stone measured at 3.00″. Against that 10-year baseline, the 1 hail day in this 90-day window run below the long-term average rate. Waterloo averages 5 hail-producing storms per year — check hail risk lookup for your address.
Waterloo's county logged fewer hail events than the Iowa median (60 per county over 10 years), placing it on the lower end of the state's hail exposure spectrum — though individual storm cells can still produce damaging hail regardless of the long-term average.
Waterloo's County, Year by Year (NOAA Archive)
| Year | Recorded hail events | Largest stone |
|---|---|---|
| 2024 | 5 | 1.50″ |
| 2023 largest stone | 11 | 3.00″ |
| 2022 | 3 | 0.88″ |
| 2020 | 8 | 1.75″ |
| 2019 | 1 | 0.75″ |
| 2017 busiest | 23 | 2.75″ |
NOAA Storm Events archive, Waterloo's county. Years with no row logged no hail events.
The county's busiest hail year in the archive was 2017 (23 recorded events), while the largest stone on record — 3.00″ — fell in 2023. If your roof predates 2017 and has never had a documented inspection, assume it has taken at least one unexamined hit.
Hail in Waterloo — Questions Homeowners Ask
Check Your Own ZIP in Waterloo
The county-level history above averages over the whole area. For a score tied to your address, run your ZIP through the hail risk lookup — Waterloo ZIP codes include 50701, 50703, 50704, 50709, 50682.
Waterloo Neighborhoods — Hail Exposure Varies by Area
Hail paths track with storm cell movement, not city limits. If you're in Westmont, River Landing, Eastmont, Northside or Waterford, check your specific street against the report locations above — distance from Waterloo's center is listed for each report.
More Resources
Roofing contractors in Waterloo · Storm damage repair in Waterloo · Insurance claim guide · Hail insurance claims in Iowa · Roof replacement costs in Waterloo · Emergency roof repair