Region Northwest
The readings under the map are for the whole map, not only the part shown.
Surface pressure (hPa) and instantaneous precip rate (mm/h)
GFS · Run 18Z 30 Sep · +0 h · Valid Wed 18Z 30 Sep
Surface pressure (hPa) and instantaneous precip rate (mm/h)
Heaviest rate 18.62 mm/h, near 38.5N 101.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 32.65 mm/h, near 40.5N 98.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 36.19 mm/h, near 22.5N 99.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 24.68 mm/h, near 33.0N 97.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 22.19 mm/h, near 34.25N 95.75W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 40.44 mm/h, near 31.75N 97.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 36.65 mm/h, near 28.25N 100.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 53.93 mm/h, near 27.25N 100.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 12.4 mm/h, near 36.75N 89.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 20.93 mm/h, near 23.0N 99.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 27.15 mm/h, near 20.25N 112.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 16.6 mm/h, near 20.25N 112.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 32.93 mm/h, near 30.0N 89.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 18.35 mm/h, near 30.75N 89.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 18.86 mm/h, near 20.25N 113.75W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 32.13 mm/h, near 20.25N 115.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 26.97 mm/h, near 20.25N 116.0W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 26.92 mm/h, near 34.75N 80.5W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 21.88 mm/h, near 31.0N 84.75W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 48.37 mm/h, near 36.0N 73.25W · unshaded ground is where the model has under 0.25 mm/h falling
Heaviest rate 24.63 mm/h, near 36.75N 70.5W · unshaded ground is where the model has under 0.25 mm/h falling
One GFS run — issued 18Z 30 Sep — 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 4 hPa interval, the same frame; only the forecast hour varies. Six-hourly to 120 hours. GFS forecasts out to 384 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 NOAA. 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.
Sources and licences
- NOAA: GFS, from NOAA's NOMADS server. US government data, not subject to copyright (NOAA/NWS terms of 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.