The Spread

Temperature, revised run by run

Shows how the forecast for the selected date at 18Z has evolved over subsequent model runs.

Valid 18Z 31 Aug · GFS 8 runs

10.010.015.015.015.015.015.020.020.020.020.020.020.020.020.020.020.020.020.020.020.020.020.020.020.025.025.025.025.025.025.025.025.025.025.025.025.025.025.025.025.025.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.030.035.035.035.035.035.035.035.040.040.0

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.