Region Lower 48
The readings under the map are for the whole map, not only the part shown.
ECMWF · Run 18Z 30 Sep · +0 h · Valid Wed 18Z 30 Sep
Nothing on the map has reached 0.25 mm yet · heaviest rate 17.61 mm/h at Wed 18Z
Wettest so far 81 mm, 100 km N of Hays, Kansas · heaviest rate 26.22 mm/h at Thu 00Z
Wettest so far 113 mm near Kearney, Nebraska · heaviest rate 34.19 mm/h at Thu 06Z
Wettest so far 119 mm near Grand Island, Nebraska · heaviest rate 31.53 mm/h at Thu 12Z
Wettest so far 166 mm, 60 km W of Ft. Worth, Texas · heaviest rate 21.28 mm/h at Thu 18Z
Wettest so far 166 mm, 60 km W of Ft. Worth, Texas · heaviest rate 26.12 mm/h at Fri 00Z
Wettest so far 187 mm at 20.0N 109.75W · heaviest rate 23.75 mm/h at Fri 06Z
Wettest so far 196 mm at 20.0N 109.75W · heaviest rate 28.27 mm/h at Fri 12Z
Wettest so far 206 mm at 20.0N 110.5W · heaviest rate 15.14 mm/h at Fri 18Z
Wettest so far 228 mm at 20.0N 110.5W · heaviest rate 27.89 mm/h at Sat 00Z
Wettest so far 232 mm at 20.0N 110.75W · heaviest rate 17.04 mm/h at Sat 06Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 15.41 mm/h at Sat 12Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 16.71 mm/h at Sat 18Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 13.5 mm/h at Sun 00Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 18.26 mm/h at Sun 06Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 15.94 mm/h at Sun 12Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 16.02 mm/h at Sun 18Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 17.8 mm/h at Mon 00Z
Wettest so far 235 mm at 20.0N 110.75W · heaviest rate 14.8 mm/h at Mon 06Z
Wettest so far 244 mm, 35 km SSE of Sabinas Hidalgo, Mexico · heaviest rate 18.46 mm/h at Mon 12Z
Wettest so far 247 mm, 35 km SSE of Sabinas Hidalgo, Mexico · heaviest rate 27.34 mm/h at Mon 18Z
One ECMWF run, issued 18Z 30 Sep — played forward 6 hours at a time, from its analysis to 120 hours out.
Methodology
Two of this site's films laid one over the other. Underneath is the Run total: everything this run puts down from its start to each frame, on Tropical Tidbits' scale. On top is the pressure Time lapse: the precipitation falling at that frame's time, on the radar scale, and the sea-level pressure at that time in 2 hPa isobars. So the rate moves on as the film plays and leaves its total behind it. The first frame is the analysis, where the run has put nothing down yet.
The total is a window and the rate and the pressure are instants, all read at the frame's valid time: the total runs from the start of the run to that time. Liquid-equivalent: snow counts as the water it melts to. GFS and ECMWF only, the two models here that publish an instantaneous rate.
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. Uncorrected model output.
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.