Region Europe
United States
Europe
The readings under the map are for the whole map, not only the part shown.
Surface pressure (hPa) and 6-hour averaged precip rate (in/h)
GEM · Run 12Z 2 Oct · +6 h · Valid Fri 18Z 2 Oct
Surface pressure (hPa) and 6-hour averaged precip rate (in/h)
Heaviest 6-hour mean 0.203 in/h, near 58.65N 6.45W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.347 in/h, near 37.5N 23.85W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.469 in/h, near 41.4N 41.4E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.518 in/h, near 43.2N 3.9E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.279 in/h, near 41.55N 0.9W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.219 in/h, near 42.15N 0.3W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.214 in/h, near 39.9N 1.8W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.153 in/h, near 42.6N 0.15W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.242 in/h, near 38.4N 1.65W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.322 in/h, near 61.65N 5.4E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.218 in/h, near 38.4N 37.35E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.286 in/h, near 59.85N 6.0E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.449 in/h, near 42.6N 3.6E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.223 in/h, near 40.05N 5.85W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.365 in/h, near 66.6N 13.5E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.27 in/h, near 65.4N 12.9E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.29 in/h, near 64.95N 12.15E · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.336 in/h, near 47.7N 0.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.227 in/h, near 43.95N 1.35W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.258 in/h, near 43.2N 3.75W · unshaded ground is where the model has under 0.01 in/h falling
One GEM run — issued 12Z 2 Oct — played forward 6 hours at a time, from 6 hours out 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 4 hPa interval, the same frame; only the forecast hour varies. Six-hourly to 120 hours. GEM forecasts out to 240 hours; this film stops at 120. The frames past the one shown load on demand. GEM publishes no precipitation rate, so the shading here is the 6-hour mean rate — the run's total precipitation at each frame less the total 6 hours before, over 6 — on the same scale as the instant the other models shade with. A mean over 6 hours is smoother and weaker than an instant, so its heavy bands light less often on the same weather; and because no 6-hour bucket ends at the analysis, this film opens at +6 h rather than showing one frame with no rain under it.
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 Environment and Climate Change Canada. 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
- Environment and Climate Change Canada: GEM, from the MSC Datamart. Data Source: Environment and Climate Change Canada, under its Data Services End-use Licence.
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.