NOAA-verified historic hailstorm
May 20, 2021 Weld County, CO Hailstorm
On May 20, 2021, NOAA's Storm Events Database recorded hail in the 2.5″+ size class in Weld County, Colorado, across 7 hail events. These are records of hail exposure, not of damage: size is a class, not a measurement, and a hail record near a property is not a finding that the property was damaged.
Peak hail size: 3.25", recorded between 7:06 PM MDT and 7:41 PM MDT.
On May 20, 2021, NOAA recorded hail up to 3.25" in Weld County, Colorado — 7 hail events between 7:06 PM MDT and 7:41 PM MDT. Source: NOAA Storm Events Database (NCEI), via HailScore. Data current as of October 2, 2026.
The 2nd-largest hailstorm recorded in Weld County since 2015 — out of 135 separate hail days on NOAA's record.
The biggest on record: June 12, 2017 — 4.25" hail.
Storm map
Each pin marks one NOAA-recorded hail event. Larger pins = larger hail.
Source: NOAA Storm Events Database (NCEI). Coordinates are NWS-reported event locations.
How the storm unfolded
NEXRAD radar tracked hail in Weld County from 4:47 PM MDT to 7:44 PM MDT, peaking at 2.75" around 7:15 PM MDT across 106 radar scans.
Source: NOAA NEXRAD Level-III hail detection (SWDI nx3hail), 15-minute intervals, Mountain Time. Each bar is the largest radar-reported hail size in that interval.
Was your property in this storm's path?
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Need it on paper
Official Hail History Report
Every hail event recorded within 1 mile of your address over the past 10 years — each with its date, size, distance, and government source ID — plus an optional date-of-loss check for one specific storm. The order form comes with May 20, 2021 pre-filled as the date of loss. Built to hand to an adjuster, a buyer, or your own file.
It documents the storm record for an address. It is not a roof inspection or a damage assessment.
Order the PDF — $9.95One-time, no account, no subscription. 24-hour full refund — see our refund policy.
Pulling addresses for work
HailScore Pro
Contractors, adjusters and public adjusters run this same storm record across a whole pipeline. A free dashboard account includes 10 date-of-loss verifications a month; Team is $49/mo for 25 storm-history PDFs — $1.96 per report instead of $9.95.
Hail history for cities in Weld County
Every recorded storm for each area, not just this one:
Hail size distribution
Below the 1″ inspection threshold
Can bruise asphalt shingles
Can crack shingles and dent soft metal
Inspection is the normal next step
Individual NOAA event records
Every record carries a unique NOAA event ID adjusters can independently verify.
| Time | Hail size | Location | NOAA event ID |
|---|---|---|---|
| 7:37 PM MDT | 3.25" | 40.730, -103.680 | 953718 |
| 7:29 PM MDT | 3" | 40.610, -103.680 | 953716 |
| 7:41 PM MDT | 2.75" | 40.650, -103.700 | 953719 |
| 7:27 PM MDT | 2" | 40.650, -103.700 | 953715 |
| 7:21 PM MDT | 1.25" | 40.610, -103.700 | 953714 |
| 7:06 PM MDT | 0.75" | 40.600, -103.840 | 953713 |
| 7:29 PM MDT | 0.75" | 40.680, -103.720 | 953717 |
Frequently asked questions
Did it hail in Weld County, Colorado on May 20, 2021?+
On May 20, 2021, NOAA's Storm Events Database recorded hail in the 2.5″+ size class in Weld County, Colorado, across 7 hail events. These are records of hail exposure, not of damage: size is a class, not a measurement, and a hail record near a property is not a finding that the property was damaged.
What was the largest hail size on May 20, 2021 in Weld County?+
NOAA's Storm Events Database recorded a peak hail size of 3.25" during the May 20, 2021 storm in Weld County, Colorado. Hail at 3.25" is large enough that a professional roof inspection is the normal next step for roofs in the storm path. Only a licensed roof inspection can determine whether a specific roof was damaged; coverage depends on the policy and carrier.
How many hail events were recorded during this storm?+
7 individual hail observations were recorded in Weld County on May 20, 2021, between approximately 7:06 PM MDT and 7:41 PM MDT. Each NOAA record represents either a ground-verified observation by a National Weather Service spotter or a radar-derived measurement.
Can I file an insurance claim for hail damage from this storm?+
Many standard homeowner's policies include hail under a "wind and hail" peril. Claim deadlines and coverage rules vary by carrier and policy — confirm yours with your insurer or, in Colorado, the Colorado Division of Insurance (doi.colorado.gov). May 20, 2021 is the date NOAA recorded hail in Weld County — a record of exposure an adjuster can check against your address, not a finding that any property was damaged. If your address was in the storm path, a professional roof inspection is the standard first step.
How accurate is NOAA's hail size measurement?+
NOAA combines ground-verified reports (hail reported by trained spotters, NWS offices, law enforcement and others) with NEXRAD radar-derived size estimates. Ground reports are the stronger evidence of what actually fell. Radar estimates are a class rather than a measurement: MESH is tuned so that roughly 75% of measured hail comes in at or below the estimate — a bias, not a symmetric error bar. Each event in NOAA's Storm Events Database has a unique event ID that adjusters can independently verify.
Was my property in the storm path?+
The storm map above shows the location of each individual hail event in this storm. Enter your address in the HailScore lookup tool for a property-level report that searches NOAA Storm Events, NEXRAD radar and MRMS radar, plus CoCoRaHS volunteer reports, around your exact coordinates.