Region Lower 48
The readings under the map are for the whole map, not only the part shown.
Surface pressure (hPa) and instantaneous precip rate (in/h)
ECMWF · Run 18Z 30 Sep · +0 h · Valid Wed 18Z 30 Sep
Surface pressure (hPa) and instantaneous precip rate (in/h)
Heaviest rate 0.693 in/h, near 20.0N 77.5W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.032 in/h, near 40.5N 99.5W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.346 in/h, near 41.5N 96.5W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.241 in/h, near 32.75N 98.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.838 in/h, near 38.25N 94.25W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.028 in/h, near 38.75N 93.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.935 in/h, near 24.75N 99.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.113 in/h, near 26.25N 100.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.596 in/h, near 30.25N 88.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.098 in/h, near 26.25N 100.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.671 in/h, near 33.5N 95.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.607 in/h, near 20.0N 113.5W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.658 in/h, near 30.5N 84.25W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.532 in/h, near 20.0N 114.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.719 in/h, near 38.75N 79.5W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.628 in/h, near 37.0N 78.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.631 in/h, near 33.0N 82.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.701 in/h, near 20.0N 102.25W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.582 in/h, near 25.75N 98.0W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 0.727 in/h, near 40.25N 65.75W · unshaded ground is where the model has under 0.01 in/h falling
Heaviest rate 1.076 in/h, near 35.0N 72.75W · unshaded ground is where the model has under 0.01 in/h falling
One ECMWF 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 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.
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.