MSLP + precip rate
GEM · Run 00Z 15 Oct · +6 h · Valid Thu 06Z 15 Oct
Region Northeast
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 00Z 15 Oct · +6 h · Valid Thu 06Z 15 Oct
Surface pressure (hPa) and 6-hour averaged precip rate (in/h)
Heaviest 6-hour mean 0.586 in/h, near 34.05N 100.2W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.395 in/h, near 21.15N 103.8W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.458 in/h, near 34.5N 99.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.426 in/h, near 32.4N 100.2W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.539 in/h, near 29.25N 105.9W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.611 in/h, near 28.95N 103.2W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.343 in/h, near 26.55N 104.1W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.517 in/h, near 21.6N 99.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.346 in/h, near 20.85N 90.3W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.25 in/h, near 53.25N 128.4W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.397 in/h, near 20.7N 95.7W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.492 in/h, near 20.7N 95.7W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.549 in/h, near 20.85N 88.8W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.49 in/h, near 26.7N 78.15W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.386 in/h, near 32.7N 69.3W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.546 in/h, near 31.65N 69.6W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.432 in/h, near 20.7N 88.05W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.751 in/h, near 32.7N 67.95W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.658 in/h, near 33.0N 68.1W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest 6-hour mean 0.549 in/h, near 33.45N 68.4W · unshaded ground is where the model has under 0.01 in/h falling
One GEM run — issued 00Z 15 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.