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May 21 in storm history
3 storms in the historical record were active on May 21 — 0 hurricanes. The strongest was Arthur (2020), a tropical storm peaking at 55 kt. Data: NOAA HURDAT2 best-track archive (2015–present on this site).
2020s
2010s
Peak winds are lifetime maxima from the NOAA best-track archive, not necessarily the intensity on May 21. Browse all-time records or seasons year by year.