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

Yellow Warbler Population Trend in West Virginia

All statesForest birds

Yellow Warbler in West Virginia has fallen sharply: down 60% on the route-weighted index since 1968.

-60%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 →
63Routes 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 Yellow 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Yellow Warbler has fallen sharply in West Virginia: down 60% on the route-weighted index since 1968.

Yellow Warbler Population Forecast in West Virginia

If the recent trend holds, Yellow Warbler in West Virginia is projected to stay roughly flat through 2029, near 4.9 (95% range 1.9–7.9). A 5-year backtest shows a typical error of ±22.2%, with 100% of held-out values landing inside the 95% band.

-0%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 →
4.9Projected 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 →
1.9–7.995% 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 →
±22.2%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, Yellow Warbler in West Virginia is projected to stay roughly flat through 2029, near 4.9 (95% range 1.9–7.9). A 5-year backtest shows a typical error of ±22.2%, with 100% 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 →
20255.42.58.4
20265.32.38.3
20275.22.28.1
20285.02.18.0
20294.91.97.9

Yellow Warbler Survey Routes in West Virginia

Routes recording Yellow 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 →
Moundsville2220241972
Spencer2020231986
Breeden1720241986
Mt Storm1519751966
Clinton1520241966
Olcott1320241966
Ruthbelle1220241975
Berryburg1119961975
Yawkey1020241966
Henderson1020232002
Stollings920211986
Hubbardstown920231966
Valley Head920241966
Sugar Grove920231966
Bismark920211976
Welch820231980
Sutton820241976
Albright819741966
Meadland720241997
Bebee720241972
Nicut620241986
Rockport620241966
Pt Pleasant520231973
Clendenin520231979
Washburn520151974

Yellow Warbler Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming

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