Absolute PWAT
ECMWF · Run 06Z 15 Oct · +0 h · Valid Thu 06Z 15 Oct
Region Lower 48
United States
Europe
The readings under the map are for the whole map, not only the part shown.
ECMWF · Run 06Z 15 Oct · +0 h · Valid Thu 06Z 15 Oct
Deepest column 62 mm, 35 km W of Compostela, Mexico
Deepest column 61 mm, 35 km W of Compostela, Mexico
Deepest column 59 mm, 80 km NE of Guantánamo, Cuba
Deepest column 62 mm, 35 km W of Compostela, Mexico
Deepest column 63 mm at 20.0N 109.0W
Deepest column 64 mm, 290 km SSE of Cabo San Lucas, Mexico
Deepest column 66 mm, 240 km S of Cabo San Lucas, Mexico
Deepest column 64 mm, 35 km N of Isla Mujeres, Mexico
Deepest column 65 mm, 50 km E of Isla Mujeres, Mexico
Deepest column 64 mm, 45 km NE of Nautla, Mexico
Deepest column 65 mm, 110 km ENE of Nautla, Mexico
Deepest column 66 mm, 100 km NE of Nautla, Mexico
Deepest column 65 mm, 135 km ENE of Nautla, Mexico
Deepest column 65 mm, 205 km ENE of Nautla, Mexico
Deepest column 66 mm, 150 km NE of Veracruz, Mexico
Deepest column 65 mm, 175 km ENE of Veracruz, Mexico
Deepest column 65 mm, 190 km NNE of Santiago Tuxtla, Mexico
Deepest column 64 mm, 195 km NNW of Paraíso, Mexico
Deepest column 64 mm, 230 km NE of Veracruz, Mexico
Deepest column 64 mm, 205 km NNE of Santiago Tuxtla, Mexico
Deepest column 63 mm, 175 km ENE of Veracruz, Mexico
Deepest column 65 mm, 150 km NE of Veracruz, Mexico
Deepest column 63 mm, 105 km NNE of Nautla, Mexico
Deepest column 62 mm, 45 km E of Tuxpam, Mexico
Deepest column 64 mm, 110 km ENE of Nautla, Mexico
One ECMWF run, issued 06Z 15 Oct — played forward 6 hours at a time, from the analysis to 144 hours out.
Methodology
PWAT — precipitable water — is how much water vapour the air overhead holds, as the depth of water it would make if it all fell at once.
Six-hourly to 144 hours. ECMWF's 00Z and 12Z runs forecast out to 360 hours, its 06Z and 18Z runs to 144.
The colours are a depth scale, the same everywhere: the cream band is a depth, not a normal. The same column is deep for Salt Lake City and shallow for Miami, so this map cannot say whether the air is unusual — the Relative to normal chart ranks each place against its own record, and that is the one to read for that.
GFS files this field as PWAT and ECMWF as total column water vapour, the same quantity. 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. Every model's full forecast for any of these cities, or anywhere else, is in the beta: request an invite; it's free during the beta.
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.