Grey Arches
Polia nebulosa
Polia nebulosa, the grey arches, is a moth of the family Noctuidae. The species was first described by Johann Siegfried Hufnagel in 1766. It is found in temperate Europe and Asia up to eastern Asia and Japan. It is not present in northernmost Fennoscandia and the southern parts of the Iberian Peninsula, Italy and Greece. In the Alps it is found at heights up to 1,600 meters. Source
Where it is now
No records in the last 8 weeks. It may be out of season where the observers and sensors are.
See the Grey Arches on the live map
Arrival dates
The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.
| Region | First arrival | Last arrival | Typical peak | Areas |
|---|---|---|---|---|
| Europe | 8 June 2026 | 15 June 2026 | 29 June 2026 | 3 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.