◆ FLATWILLOW, MT HAIL HISTORY · PETROLEUM COUNTY
Flatwillow, MT hail history & hail map
Flatwillow, Montana has had 3 hail events in the past 5 years, with hail up to 2.00″ (Golf Ball). Most recent: Aug 18, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
3Hail events in the past 5 years
2.00″Largest recorded hail · Golf Ball
2.00″Largest ground report (within 3 mi)
1.00″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Flatwillow, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Flatwillow
| Date | Peak hail | Sources |
|---|---|---|
| Aug 18, 2026 | 0.75″ Penny | Radar 0.75″ |
| Jul 18, 2025 | 2.00″ Golf Ball | 1 ground report (max 2.00″) |
| Jul 30, 2023 | 1.00″ Quarter | Radar 1.00″ · 1 ground report (max 1.00″) |
More Montana hail history
All Montana cities & hail days →
Events count days with NOAA MRMS radar hail over Flatwillow (46.910, -108.360) or an NWS / CoCoRaHS hail report within 3 miles. Data window: NOAA MRMS radar hail swaths Oct 2021 – Nov 2026; NWS / NCEI Storm Events reports Nov 2024 – Jul 2026; CoCoRaHS volunteer reports Oct 2021 – present. Radar hail sizes are estimates, not ground truth; hail at any single address can differ.