Preliminary radar record — NOAA MRMS
July 28, 2026 Boulder County, CO Hailstorm
On July 28, 2026, NOAA MRMS radar estimated hail in the 2–2.5″ size class in Boulder County, Colorado, across 60 radar cells. Radar-estimated MESH ≥1″ is preliminary; size is a class, not a measurement, and this is not a damage outline.
Peak radar-estimated hail size: 2.46".
On July 28, 2026, NOAA MRMS radar detected radar-estimated hail up to 2.46" in Boulder County, Colorado — 60 radar cells on July 28, 2026. Source: NOAA Multi-Radar/Multi-Sensor (MRMS) MESH, via HailScore. Data current as of September 15, 2026.
Boulder County has 41 NOAA-verified hail days on record since 2015. The largest measured 3".
For scale, the biggest on record: June 19, 2018 — 3" hail (NOAA ground-verified).
Storm map
Colour shows radar-estimated hail size across the storm's footprint — the ≥1″ MRMS cells merged into continuous bands, keyed on the map. The callout marks the peak cell.
Zoom to street level with HailScore Pro
This is a radar footprint, not a canvassing list — it shows where hail was estimated, not which roofs were damaged.
See HailScore ProBands overlap and blend where sizes meet. Radar-estimated MESH ≥1″ · preliminary · size is a class, not a measurement · not a damage outline
Source: NOAA Multi-Radar/Multi-Sensor (MRMS) MESH. Coordinates are radar-grid cell centers — preliminary, not ground-verified. Sizes are a class, not a measurement — MESH is tuned so most measured hail comes in at or below the estimate.
Because each cell is padded before merging and small gaps between neighbouring cells are bridged, the shaded shape is larger than the cells actually measured and encloses pockets where the radar recorded nothing. Read it as the storm's approximate extent, not a cell-by-cell map: it is not a damage outline, not a claim that every roof inside it was hit, and not a circle drawn around an address. Whether a specific property was affected depends on its exact distance from the measured cells.
How the storm unfolded
NEXRAD radar tracked hail in Boulder County from 1:11 PM to 2:19 PM MT, peaking at 3.25" around 1:45 PM across 33 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.
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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. 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.
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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 Boulder County
Every recorded storm for each area, not just this one:
Hail size distribution
Cosmetic damage potential
Damages asphalt shingles
Severe roof damage
Total roof replacement
Individual radar cells (preliminary)
Radar-estimated MESH readings from NOAA MRMS. Official NOAA event IDs publish with the verified Storm Events records (typically 2–4 months later).
| Radar snapshot (MT) | Est. hail size | Location | Record |
|---|---|---|---|
| 3:00 PM MDT | 2.46" | in Lyons40.245, -105.335 | MRMS radar cell |
| 3:00 PM MDT | 2.37" | 4 miles W of Lyons40.245, -105.345 | MRMS radar cell |
| 3:00 PM MDT | 2.3" | in Lyons40.255, -105.315 | MRMS radar cell |
| 3:00 PM MDT | 2.26" | in Lyons40.245, -105.325 | MRMS radar cell |
| 3:00 PM MDT | 2.14" | in Lyons40.255, -105.325 | MRMS radar cell |
| 3:00 PM MDT | 2.14" | in Lyons40.245, -105.315 | MRMS radar cell |
| 3:00 PM MDT | 2.07" | 4 miles NW of Lyons40.255, -105.335 | MRMS radar cell |
| 3:00 PM MDT | 2.06" | 6 miles W of Lyons40.255, -105.375 | MRMS radar cell |
| 3:00 PM MDT | 2.04" | 5 miles NW of Lyons40.255, -105.345 | MRMS radar cell |
| 3:00 PM MDT | 1.97" | in Lyons40.245, -105.305 | MRMS radar cell |
| 3:00 PM MDT | 1.96" | 7 miles W of Lyons40.255, -105.385 | MRMS radar cell |
| 3:00 PM MDT | 1.96" | 5 miles W of Lyons40.245, -105.355 | MRMS radar cell |
| 3:00 PM MDT | 1.89" | in Lyons40.245, -105.295 | MRMS radar cell |
| 3:00 PM MDT | 1.78" | in Lyons40.255, -105.285 | MRMS radar cell |
| 3:00 PM MDT | 1.72" | 7 miles W of Lyons40.255, -105.395 | MRMS radar cell |
| 3:00 PM MDT | 1.66" | 6 miles W of Lyons40.255, -105.365 | MRMS radar cell |
| 3:00 PM MDT | 1.62" | in Lyons40.255, -105.255 | MRMS radar cell |
| 3:00 PM MDT | 1.61" | in Lyons40.245, -105.285 | MRMS radar cell |
| 3:00 PM MDT | 1.61" | in Lyons40.255, -105.305 | MRMS radar cell |
| 3:00 PM MDT | 1.6" | 5 miles W of Lyons40.245, -105.365 | MRMS radar cell |
| 3:00 PM MDT | 1.59" | 5 miles NW of Lyons40.255, -105.355 | MRMS radar cell |
| 3:00 PM MDT | 1.59" | in Lyons40.255, -105.295 | MRMS radar cell |
| 3:00 PM MDT | 1.57" | in Lyons40.255, -105.245 | MRMS radar cell |
| 3:00 PM MDT | 1.53" | 8 miles W of Lyons40.255, -105.405 | MRMS radar cell |
| 3:00 PM MDT | 1.5" | in Lyons40.235, -105.275 | MRMS radar cell |
| 3:00 PM MDT | 1.5" | in Lyons40.255, -105.265 | MRMS radar cell |
| 3:00 PM MDT | 1.47" | in Lyons40.235, -105.285 | MRMS radar cell |
| 3:00 PM MDT | 1.47" | 7 miles NE of Allenspark40.255, -105.425 | MRMS radar cell |
| 3:00 PM MDT | 1.45" | 7 miles NE of Allenspark40.255, -105.415 | MRMS radar cell |
| 3:00 PM MDT | 1.44" | in Lyons40.245, -105.275 | MRMS radar cell |
| 3:00 PM MDT | 1.43" | in Lyons40.245, -105.205 | MRMS radar cell |
| 3:00 PM MDT | 1.43" | in Lyons40.235, -105.325 | MRMS radar cell |
| 3:00 PM MDT | 1.41" | in Lyons40.255, -105.275 | MRMS radar cell |
| 3:00 PM MDT | 1.41" | 6 miles W of Lyons40.245, -105.375 | MRMS radar cell |
| 3:00 PM MDT | 1.33" | in Lyons40.235, -105.335 | MRMS radar cell |
| 3:00 PM MDT | 1.33" | in Lyons40.255, -105.235 | MRMS radar cell |
| 3:00 PM MDT | 1.31" | in Lyons40.225, -105.275 | MRMS radar cell |
| 3:00 PM MDT | 1.28" | in Lyons40.235, -105.265 | MRMS radar cell |
| 3:00 PM MDT | 1.26" | 7 miles W of Lyons40.245, -105.395 | MRMS radar cell |
| 3:00 PM MDT | 1.26" | in Lyons40.245, -105.265 | MRMS radar cell |
| 3:00 PM MDT | 1.26" | in Lyons40.255, -105.215 | MRMS radar cell |
| 3:00 PM MDT | 1.26" | in Lyons40.245, -105.255 | MRMS radar cell |
| 3:00 PM MDT | 1.2" | in Lyons40.235, -105.315 | MRMS radar cell |
| 3:00 PM MDT | 1.19" | 5 miles W of Lyons40.235, -105.355 | MRMS radar cell |
| 3:00 PM MDT | 1.19" | 4 miles W of Lyons40.235, -105.345 | MRMS radar cell |
| 3:00 PM MDT | 1.19" | in Lyons40.245, -105.215 | MRMS radar cell |
| 3:00 PM MDT | 1.19" | 6 miles W of Lyons40.245, -105.385 | MRMS radar cell |
| 3:00 PM MDT | 1.17" | in Lyons40.235, -105.255 | MRMS radar cell |
| 3:00 PM MDT | 1.17" | 4 miles NE of Lyons40.255, -105.195 | MRMS radar cell |
| 3:00 PM MDT | 1.15" | in Lyons40.235, -105.305 | MRMS radar cell |
Showing first 50 of 60 records.
Frequently asked questions
Did it hail in Boulder County, Colorado on July 28, 2026?+
On July 28, 2026, NOAA MRMS radar estimated hail in the 2–2.5″ size class in Boulder County, Colorado, across 60 radar cells. Radar-estimated MESH ≥1″ is preliminary; size is a class, not a measurement, and this is not a damage outline.
What is the largest hail recorded on July 28, 2026 in Boulder County so far?+
NOAA's MRMS radar network detected radar-estimated hail up to 2.46" in Boulder County, Colorado on July 28, 2026. This is a preliminary, radar-estimated figure (MESH — Maximum Estimated Size of Hail), not a ground-verified measurement. Ground-verified NOAA Storm Events records for this date typically publish 2-4 months later, and this page upgrades to them automatically.
Is this storm record final?+
No — this is a preliminary radar record, current as of September 15, 2026. It is built from NOAA MRMS radar data, which updates continuously (typically within about 2 hours of a storm). The verified NOAA Storm Events Database entry for this date, with ground-truthed observations and official event IDs, usually publishes 2-4 months after the storm. MESH is tuned so that roughly 75% of measured hail comes in at or below the radar estimate, so read a size as a class (within about one tier), not as a measurement.
Was my property in the storm area?+
The map above shades the storm's radar footprint — the MRMS cells that estimated hail of 1 inch or larger, merged into colour-coded size bands. Enter your address in the free HailScore lookup for a property-level check of the radar record against your exact coordinates — no signup required.
Can I use this preliminary record for an insurance claim?+
The radar record can help you and your adjuster establish that hail was detected near your property on July 28, 2026 — it is the same NOAA MRMS data source many industry tools use. For the date of loss itself, adjusters typically also reference the ground-verified NOAA Storm Events entry once it publishes. A professional roof inspection remains the standard first step for documenting actual damage.