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Species · West Virginia · BBS 2025 Release · 1966–2024

Black-and-white Warbler Population Trend in West Virginia

All statesForest birds

Black-and-white Warbler in West Virginia has increased: up 40% on the route-weighted index since 1968.

+40%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
59Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-and-white Warbler Trends in West VirginiaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Black-and-white Warbler in West Virginia. See the full index history below.

Black-and-white Warbler Population Forecast in West Virginia

If the recent trend holds, Black-and-white Warbler in West Virginia is projected to fall about 30% by 2029 — from 3.8 in 2024 to a central estimate of 2.6 (95% range 1.5–3.8). A 5-year backtest shows a typical error of ±22.5%, with 80% of held-out values landing inside the 95% band.

-30%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
2.6Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.5–3.895% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±22.5%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Black-and-white Warbler in West Virginia is projected to fall about 30% by 2029 — from 3.8 in 2024 to a central estimate of 2.6 (95% range 1.5–3.8). A 5-year backtest shows a typical error of ±22.5%, with 80% of held-out values landing inside the 95% band.19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20252.61.43.7
20262.61.43.7
20272.61.43.8
20282.61.43.8
20292.61.53.8

Black-and-white Warbler Survey Routes in West Virginia

Routes recording Black-and-white Warbler in West Virginia.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Bowden1220241993
Three Forks1120241971
Fayetteville1019961980
Sutton1020241976
Strange Crk1020241982
Meadowville1020241972
Bramwell920231978
Denmar920241980
Ruthbelle920241975
Wymer820021997
Pedro720241979
Ghent720241978
Richwood720241980
Hanover620241980
Albright619741966
Stollings520211986
Welch520231980
Green Bank520241977
Glade Run 2520242004
Breeden420241986
Clear Creek320241988
Spencer320231986
Nicut320241986
Valley Head320241966
Washburn320221976

Black-and-white Warbler Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawaregeorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.