RoofTake

Historical hail archive: January 2016–December 2025. NOAA radar estimates within 25 miles of each city centre. ZIP matches use the first three digits; this is not a property-level report or a live alert service. Coverage and source.

Denver County · Colorado · NOAA radar record

The June 19, 2018 hailstorm — Denver, CO

Radar estimated the largest stone at 4.00 in (10.2 cm), Grapefruit size. It was the 1st biggest hail day on record for Denver since 2016. Radar detections fall within the hour range 00:00–22:00 UTC on this UTC calendar date. Local dates and times may differ.

4.00 inlargest stone estimated (10.2 cm)
304radar signatures
100%hail probability, 100% severe
1stbiggest day in Denver

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Data last refreshed: · source: NOAA NCEI Severe Weather Data Inventory, nx3hail

What those numbers mean

A 4.00 in stone is roughly what people call Grapefruit size. At this size damage is usually obvious — fractured shingles, dented gutters and vents, and often the decking underneath.

A radar estimate, not a ground measurement.

MAXSIZE is the algorithm's estimate of the largest stone aloft in the storm cell. Hail melts and breaks up on the way down, so what lands is usually smaller. And the swath is narrow: a detection 6.03 miles from downtown says nothing about your street. What radar can and cannot prove.

If you own a roof in Denver and this date means nothing to you, it is worth a look. Hail damage to asphalt shingles does not leak for years — and it looks different from what most people expect.

Where else it hailed that day

Radar also detected hail in 12 other areas on the same UTC date. These records do not establish that the areas shared one storm system.

AreaRadar max MetricSignatures
Greeley, CO4.00 in10.2 cm687
Fort Collins, CO4.00 in10.2 cm154
Cheyenne, WY3.00 in7.6 cm29
Colorado Springs, CO1.50 in3.8 cm93
Omaha, NE1.25 in3.2 cm24
Lincoln, NE1.25 in3.2 cm99
St. Louis, MO1.25 in3.2 cm6
Sioux City, IA1.25 in3.2 cm1
Des Moines, IA1.00 in2.5 cm1
Columbia, MO1.00 in2.5 cm1
Kansas City, MO0.75 in1.9 cm1
Grand Island, NE0.50 in1.3 cm2

What Denver took either side of it

Before

  1. June 18, 2018
    2.25 in (5.7 cm) — Hen egg size, radar-estimated
    5 radar signatures · closest signature 23.92 mi from the centroid · hail probability 100%, severe 80%
  2. June 16, 2018
    0.75 in (1.9 cm) — Penny size, radar-estimated
    4 radar signatures · closest signature 13.66 mi from the centroid · hail probability 100%, severe 10%
  3. June 7, 2018
    0.50 in (1.3 cm) — Marble size, radar-estimated
    2 radar signatures · closest signature 10.54 mi from the centroid · hail probability 100%
  4. May 30, 2018
    0.50 in (1.3 cm) — Marble size, radar-estimated
    2 radar signatures · closest signature 24.1 mi from the centroid · hail probability 100%, severe 30%
  5. May 28, 2018
    1.25 in (3.2 cm) — Half dollar size, radar-estimated
    2 radar signatures · closest signature 12.32 mi from the centroid · hail probability 100%, severe 60%

Since

  1. June 20, 2018
    0.75 in (1.9 cm) — Penny size, radar-estimated
    9 radar signatures · closest signature 3.16 mi from the centroid · hail probability 100%, severe 10%
  2. June 24, 2018
    1.25 in (3.2 cm) — Half dollar size, radar-estimated
    37 radar signatures · closest signature 3.24 mi from the centroid · hail probability 100%, severe 80%
  3. July 3, 2018
    0.50 in (1.3 cm) — Marble size, radar-estimated
    4 radar signatures · closest signature 1.01 mi from the centroid · hail probability 100%
  4. July 4, 2018
    1.25 in (3.2 cm) — Half dollar size, radar-estimated
    17 radar signatures · closest signature 10.92 mi from the centroid · hail probability 100%, severe 40%
  5. July 5, 2018
    1.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
    51 radar signatures · closest signature 7.29 mi from the centroid · hail probability 100%, severe 60%

The full Denver record — RoofTake Score 73

Were you there?

Photographs and first-hand reports of a specific storm are the one thing about this date that exists nowhere else. Add yours on your city's page — no name, no email, structured fields only.

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Common questions

Did hail hit my house on June 19, 2018?

This page tells you only that radar detected hail within 25 miles of downtown Denver. Hail swaths are narrow and sharply bounded — one street can be wrecked and the next untouched. Check your ZIP on the home page, then go and look at the roof.

How big was the hail?

The algorithm estimated the largest stone in the storm cell at 4.00 in (10.2 cm) — Grapefruit size. That is an estimate of what was aloft, not a measurement of what landed. Ground truth is usually smaller.

Can I use this page for an insurance claim?

You can use it as evidence of a date of loss — the source is NOAA's public database and we cite it. It does not prove damage to your roof; only an inspection does that. Our claim letter generator drops this citation into your notice of claim for you.

Why have I never heard about this storm?

Most hail never makes the news. Radar sees far more of it than anybody reports, which is exactly why these pages exist.

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