How the pressure forecast changed in 24 hours

Shows how the forecast for one moment about 48 hours out changed over the last 24 hours of model runs.

Valid 00Z 2 Sep · GFS 00Z 30 Aug → 00Z 31 Aug

Falling ← hPa → rising · range -4.6 to +6.2 hPa

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.