Region Lower 48
United States
Europe
The readings under the map are for the whole map, not only the part shown.
Surface pressure (hPa) and instantaneous precip rate (mm/h)
ECMWF · Run 18Z 4 Oct · +0 h · Valid Sun 18Z 4 Oct
Surface pressure (hPa) and instantaneous precip rate (mm/h)
Heaviest rate 31.69 mm/h, near 30.0N 90.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 31.58 mm/h, near 30.75N 86.75W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 39.55 mm/h, near 31.0N 86.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 28.68 mm/h, near 31.25N 85.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 41.11 mm/h, near 30.75N 84.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 52.87 mm/h, near 30.75N 83.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 28.68 mm/h, near 30.5N 83.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 45.26 mm/h, near 30.5N 82.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 50.61 mm/h, near 30.5N 82.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 21.4 mm/h, near 20.0N 120.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 25.63 mm/h, near 20.0N 121.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 29.31 mm/h, near 21.25N 121.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 35.08 mm/h, near 32.5N 68.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 47.72 mm/h, near 33.0N 66.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 18.28 mm/h, near 21.25N 124.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 22.99 mm/h, near 22.75N 125.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 20.64 mm/h, near 26.0N 81.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 22.17 mm/h, near 23.0N 125.75W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 18.24 mm/h, near 25.0N 97.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 30.59 mm/h, near 23.0N 126.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 22.32 mm/h, near 23.0N 127.0W · unshaded ground is where the model has under 0.25 mm/h falling
One ECMWF run — issued 18Z 4 Oct — played forward 6 hours at a time, from its analysis to 120 hours out.
Methodology
Step forward and the pressure pattern moves, and the precipitation under it moves with it: that motion is the weather this run forecasts, not the forecast changing — Forecast Evolution is the film for that. Same chart grammar as the surface analysis: the same reduction, the same 2 hPa interval, the same frame; only the forecast hour varies. Six-hourly to 120 hours. ECMWF's 18Z run forecasts out to 144 hours; this film stops at 120. The frames past the one shown load on demand.
This map is drawn from model output we store ourselves, not from anyone's picture of it, and is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). 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. Every model's full forecast for any of these cities, or anywhere else, is in the beta: request an invite; it's free during the beta.
Sources and licences
- ECMWF: IFS, from ECMWF's open data. This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Source: www.ecmwf.int. This ECMWF data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). ECMWF does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use.
What we change: each field is cropped to the frame these maps share when we download it, and each map then smooths, contours, differences or ranks those numbers as its Methodology says. These are our maps of the providers' numbers, not their products, and none of them has reviewed or endorsed this site.
Coastlines, borders, lakes and place names: Natural Earth, public domain.