Legend
Top 10 deadliest floods since 2006 (Storm Events; 11 with a tie) (11)
Top 10 NFIP flood-insurance payouts since 2006 (10)
Record river peaks in the 12 floods that broke the most records (282)
Every other USGS record peak since 2006 (gauges with 50+ years) (765)
Record crests on DisasterAWARE alerts, 8 archive-table floods (105)
NWS flash flood warnings (IEM), Texas, July 3–6, 2025 (82)
NWS storm reports (4412): orange = flash flood 2115, cyan = flood 791, green = heavy rain 1406, purple = coastal flood/surge 93, brown = debris flow 7 — OBSERVED, IEM; 2010–2025. As for the warnings, reports from NWS offices outside the storm are left out: Texas Hill Country flash flood: El Paso; Hurricane Harvey: El Paso, Fort Worth, Midland
Flash flood warnings, 5 more floods (458; red = Flash Flood Emergency at issuance or in a follow-up, 82, 8 of them upgraded) — ALERT, IEM; Helene/Harvey/Ida/KY 2022/LA 2016
River flood warnings, same 5 floods (524; thin unfilled outlines = 39 warnings with no NWS polygon, drawn as their county) — ALERT, IEM
NWS river crests (1923; black = highest on the gauge's NWS crest list, 460; dark red/orange/yellow = major/moderate/minor; grey = below flood stage; white = no flood stage set) — OBSERVED
USGS high-water marks (6502 sites, 2011–2025 floods; zoom 6+) — OBSERVED
FEMA disaster-declared counties (12 floods, 2010–2025) — REPORTED
Dark red: the deadliest floods (deaths in NOAA Storm Events flood entries; marker at the county with most deaths, or one of the tied counties). Blue: the largest NFIP flood-insurance payouts (dollars of the time; marker at the county paid most). Teal and grey: USGS gauges with 50+ years of record whose highest flow ever came in 2006 or later. Purple (off by default): record crests (NWS crest history) on DisasterAWARE flood alerts for the 8 archive-table floods. Orange outlines: NWS flash flood warnings (IEM VTEC), Texas, July 3–6, 2025 (ALERT). Click any marker. As of 2026-10-09. Off at load (switch on in the layer list): NWS flash flood and river flood warnings for five more floods (IEM), NWS river crests, NWS storm reports, USGS high-water marks, FEMA declared counties, and Stage IV rainfall totals for the three deadliest floods and Louisiana 2016 (MODELED). Coverage by era: warning polygons 2016–2025, rainfall grids 2016–2025, storm reports, crests and FEMA counties 2010–2025, high-water marks 2011–2025.
Rainfall total, Harvey, 7 days ending 2017-09-01 12Z (Stage IV, MODELED)
2–4 in
4–6 in
6–10 in
10–15 in
15–20 in
20–30 in
≥ 30 in
Radar + gauge estimate on a ~4 km grid (NWS Stage IV, 12Z to 12Z days). Grid cells smooth out the very highest gauge totals.
Rainfall total, Helene, 96 h ending 2024-09-28 12Z (Stage IV, MODELED)
2–4 in
4–6 in
6–10 in
10–15 in
15–20 in
20–30 in
≥ 30 in
Radar + gauge estimate on a ~4 km grid (NWS Stage IV, 12Z to 12Z days). Grid cells smooth out the very highest gauge totals.
Rainfall total, Texas Hill Country, 72 h ending 2025-07-06 12Z (Stage IV, MODELED)
2–4 in
4–6 in
6–10 in
10–15 in
15–20 in
20–30 in
≥ 30 in
Radar + gauge estimate on a ~4 km grid (NWS Stage IV, 12Z to 12Z days). Grid cells smooth out the very highest gauge totals.
Rainfall total, Louisiana, 5 days ending 2016-08-15 12Z (Stage IV, MODELED)
2–4 in
4–6 in
6–10 in
10–15 in
15–20 in
20–30 in
≥ 30 in
Radar + gauge estimate on a ~4 km grid (NWS Stage IV, 12Z to 12Z days). Grid cells smooth out the very highest gauge totals. Drawn: the land area of 2 in or more joined to the Louisiana core, south Texas to the Florida Panhandle; Gulf cells (radar-only, no gauges; up to 41 in) are left out. Over land the grid peaks at 27.2 in; the 31.39 in at Watson in the article is a gauge total (grid cell there: 26.8 in).
