Region Lower 48
The readings under the map are for the whole map, not only the part shown.
GEM · Run 12Z 30 Sep · +24 h · Valid Thu 12Z 1 Oct
Wettest 140 mm, 35 km E of Escuinapa, Mexico · Wed 12Z to Thu 12Z
Wettest 140 mm, 35 km E of Escuinapa, Mexico · Wed 18Z to Thu 18Z
Wettest 125 mm near Brownwood, Texas · Thu 00Z to Fri 00Z
Wettest 175 mm, 70 km WSW of Reynosa, Mexico · Thu 06Z to Fri 06Z
Wettest 182 mm, 35 km ENE of Laredo, Texas · Thu 12Z to Fri 12Z
Wettest 188 mm near Montemorelos, Mexico · Thu 18Z to Fri 18Z
Wettest 189 mm near Montemorelos, Mexico · Fri 00Z to Sat 00Z
Wettest 226 mm near Ciudad Valles, Mexico · Fri 06Z to Sat 06Z
Wettest 225 mm at 20.1N 112.5W · Fri 12Z to Sat 12Z
Wettest 305 mm at 20.1N 112.5W · Fri 18Z to Sat 18Z
Wettest 325 mm at 20.1N 112.65W · Sat 00Z to Sun 00Z
Wettest 329 mm at 20.1N 112.65W · Sat 06Z to Sun 06Z
Wettest 216 mm at 20.1N 112.65W · Sat 12Z to Sun 12Z
Wettest 179 mm, 70 km NW of Halachó, Mexico · Sat 18Z to Sun 18Z
Wettest 178 mm at 21.0N 114.6W · Sun 00Z to Mon 00Z
Wettest 176 mm, 220 km SSW of New Iberia, Louisiana · Sun 06Z to Mon 06Z
Wettest 174 mm, 220 km SSW of New Iberia, Louisiana · Sun 12Z to Mon 12Z
Wettest 165 mm, 55 km W of San Fernando, Mexico · Sun 18Z to Mon 18Z
Wettest 184 mm, 95 km SSE of San Fernando, Mexico · Mon 00Z to Tue 00Z
Wettest 191 mm, 95 km SSE of San Fernando, Mexico · Mon 06Z to Tue 06Z
Wettest 193 mm, 45 km ENE of Poza Rica de Hidalgo, Mexico · Mon 12Z to Tue 12Z
Wettest 205 mm, 45 km ENE of Poza Rica de Hidalgo, Mexico · Mon 18Z to Tue 18Z
Wettest 162 mm, 45 km ENE of Poza Rica de Hidalgo, Mexico · Tue 00Z to Wed 00Z
Wettest 122 mm, 60 km NE of Nautla, Mexico · Tue 06Z to Wed 06Z
Wettest 126 mm, 220 km E of Grand Turk, Turks and Caicos Islands · Tue 12Z to Wed 12Z
Wettest 144 mm, 95 km SE of Prince Rupert, British Columbia · Tue 18Z to Wed 18Z
Wettest 174 mm at 27.0N 86.85W · Wed 00Z to Thu 00Z
Wettest 200 mm, 115 km SSE of Prince Rupert, British Columbia · Wed 06Z to Thu 06Z
Wettest 197 mm at 20.1N 127.05W · Wed 12Z to Thu 12Z
Wettest 199 mm at 20.1N 127.05W · Wed 18Z to Thu 18Z
Wettest 211 mm at 25.05N 87.6W · Thu 00Z to Fri 00Z
Wettest 307 mm at 25.5N 87.0W · Thu 06Z to Fri 06Z
Wettest 348 mm at 25.65N 86.85W · Thu 12Z to Fri 12Z
Wettest 453 mm at 25.8N 86.1W · Thu 18Z to Fri 18Z
Wettest 563 mm at 25.8N 86.1W · Fri 00Z to Sat 00Z
Wettest 579 mm at 25.65N 86.85W · Fri 06Z to Sat 06Z
Wettest 827 mm at 25.8N 86.85W · Fri 12Z to Sat 12Z
One GEM run, issued 12Z 30 Sep — 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. GEM forecasts out to 240 hours. 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 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.
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.