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US 1-in-1000-year rainstorms become much more common

Today’s thousand-year three-day downpours over the United States could strike several times more often at 2–4 °C of global warming.

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What event rarity and domain does this paper target?

1-in-1000-year historical 3-day precipitation in 15 continental US regions.

Why pool at least 40 grid cells per cluster?

26 years of GPCC then yield at least 1,040 grid-years, stabilizing GEV tail fits.

What accumulation window proxies flood risk?

3-day events.

How many GPCC grid points cover CONUS here?

834 points at 1° resolution.

What present-day warming is matched to 1988–2013?

0.67 °C above 1851–1880 in HadCRUT.

How much more frequent are historical 1000-year events at 2 °C?

2–5 times, depending on region.

How much more frequent are they at 4 °C?

5–10 times more frequent in models that reach that warming.

Which region shows more than a doubling of 500-year event intensity?

The East Coast cluster; the western-states cluster changes less.

What distance-weight parameter α was chosen?

α = 9, balancing geographic compactness against precipitation-regime similarity.

How many models inform the 3–4 °C results?

A subset of four models that reach those thresholds under RCP8.5.

What US flooding statistic is cited in the introduction?

90% of federally declared natural disasters involve flooding.