How the forecast changed in 24 hours

Shows how the forecast for the selected date at 18Z changed over the last 24 hours of model runs.

Valid 18Z 1 Sep · GFS 12Z 29 Aug → 12Z 30 Aug

Colder ← °C → warmer · range -12.2 to +10.9 °C

Every map on this page is drawn from model output we store ourselves, not from anyone's picture of it. The per-city read of the same day — which cities the models are fighting about, and what the discussion makes of it — is on the national page.