Region Lower 48
The readings under the map are for the whole map, not only the part shown.
ECMWF AIFS · Run 00Z 1 Oct · +24 h · Valid Fri 00Z 2 Oct
Wettest 100 mm at 20.0N 108.75W · Thu 00Z to Fri 00Z
Wettest 104 mm at 20.0N 109.0W · Thu 06Z to Fri 06Z
Wettest 113 mm at 20.0N 109.25W · Thu 12Z to Fri 12Z
Wettest 96 mm at 20.0N 109.25W · Thu 18Z to Fri 18Z
Wettest 78 mm at 20.0N 110.25W · Fri 00Z to Sat 00Z
Wettest 84 mm at 20.0N 110.5W · Fri 06Z to Sat 06Z
Wettest 79 mm at 20.0N 110.5W · Fri 12Z to Sat 12Z
Wettest 83 mm at 20.0N 111.75W · Fri 18Z to Sat 18Z
Wettest 86 mm at 20.0N 112.0W · Sat 00Z to Sun 00Z
Wettest 107 mm at 20.0N 112.75W · Sat 06Z to Sun 06Z
Wettest 117 mm at 20.0N 113.0W · Sat 12Z to Sun 12Z
Wettest 112 mm at 20.0N 113.0W · Sat 18Z to Sun 18Z
Wettest 104 mm at 20.0N 113.5W · Sun 00Z to Mon 00Z
Wettest 106 mm at 20.0N 114.75W · Sun 06Z to Mon 06Z
Wettest 109 mm at 20.0N 115.5W · Sun 12Z to Mon 12Z
Wettest 115 mm at 20.0N 116.0W · Sun 18Z to Mon 18Z
Wettest 115 mm at 20.0N 116.25W · Mon 00Z to Tue 00Z
Wettest 114 mm at 20.25N 117.5W · Mon 06Z to Tue 06Z
Wettest 118 mm at 20.25N 118.5W · Mon 12Z to Tue 12Z
Wettest 118 mm at 20.5N 118.75W · Mon 18Z to Tue 18Z
Wettest 111 mm at 20.5N 119.25W · Tue 00Z to Wed 00Z
Wettest 91 mm at 20.5N 119.75W · Tue 06Z to Wed 06Z
Wettest 82 mm at 30.0N 78.0W · Tue 12Z to Wed 12Z
Wettest 91 mm at 30.25N 77.25W · Tue 18Z to Wed 18Z
Wettest 101 mm at 30.5N 76.5W · Wed 00Z to Thu 00Z
Wettest 111 mm at 30.5N 76.25W · Wed 06Z to Thu 06Z
Wettest 106 mm at 30.75N 75.5W · Wed 12Z to Thu 12Z
Wettest 91 mm at 31.0N 74.5W · Wed 18Z to Thu 18Z
Wettest 80 mm, 70 km NE of Bella Bella, British Columbia · Thu 00Z to Fri 00Z
Wettest 72 mm, 70 km NE of Bella Bella, British Columbia · Thu 06Z to Fri 06Z
Wettest 62 mm at 24.0N 127.75W · Thu 12Z to Fri 12Z
Wettest 62 mm at 24.5N 129.25W · Thu 18Z to Fri 18Z
Wettest 69 mm at 24.5N 129.5W · Fri 00Z to Sat 00Z
Wettest 69 mm at 24.75N 130.0W · Fri 06Z to Sat 06Z
Wettest 73 mm at 24.75N 130.5W · Fri 12Z to Sat 12Z
Wettest 69 mm at 24.75N 130.75W · Fri 18Z to Sat 18Z
Wettest 61 mm at 25.0N 131.0W · Sat 00Z to Sun 00Z
One ECMWF AIFS run, issued 00Z 1 Oct — played forward 6 hours at a time, from 24 to 240 hours out.
Methodology
Each frame is the precipitation this run puts down in the 24 hours to it — its total at that hour less its total 24 hours before — so the film starts at +24 h, the first frame with a whole day behind it. Liquid-equivalent: snow counts as the water it melts to.
The colours are Tropical Tidbits' scale, so a reader who knows theirs can read this one. Three of its steps are re-shaded: at 0.5 in, at 2 in — where, on theirs, a reader with protanopia sees the 1.75–2 in band and the 2–2.5 in band as one colour — and among the yellows above 12 in. Same hues; the lightness is re-spaced so every step is visible in every common form of colour-blindness.
Six-hourly to 240 hours. ECMWF AIFS forecasts out to 360 hours; this film stops at 240. 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: AIFS Single, 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.