El alias 'Fecha' no se puede ver desde allí.
Puede usar algunas tablas después de CON, por lo que le aconsejo que mueva la segunda selección allí.
No estoy completamente seguro acerca de la estructura de la tabla weather.meso, pero al adivinar en función de su consulta, esto debería funcionar:
WITH
forecast_prep AS (
SELECT
date_trunc('day', foretime) :: DATE AS Foredate,
extract(HOUR FROM foretime) + 1 AS foreHE,
lat,
lon,
max(windspeed) as windspeed,
max(as_of) AS as_of
FROM weather.forecast
WHERE date_trunc('day', foretime) :: DATE - as_of >= INTERVAL '16 hours'
GROUP BY Foredate, foreHE, lat, lon
),
tmp AS (
SELECT
meso.station,
meso.lat,
meso.lon,
meso.timestmp,
date_trunc('day', meso.timestmp) :: DATE AS Date,
extract(HOUR FROM meso.timestmp) + 1 AS HE,
CAST(AVG(meso.windspd) AS NUMERIC(19, 2)) AS Actual
FROM weather.meso
GROUP BY station, lat, lon, timestmp, Date, HE
)
SELECT
tmp.station, tmp.Date, tmp.HE, tmp.Actual, forecast_prep.windspeed, forecast_prep.as_of
FROM tmp
INNER JOIN forecast_prep ON (
tmp.lat = forecast_prep.lat
AND tmp.lon = forecast_prep.lon
AND tmp.Date = forecast_prep.Foredate
AND tmp.HE = forecast_prep.foreHE
)
WHERE
(tmp.timestmp BETWEEN '2016-02-01' AND '2016-02-02')
AND (tmp.station = 'KSBN')
GROUP BY
tmp.station, tmp.Date, tmp.HE, forecast_prep.windspeed, forecast_prep.as_of, tmp.Actual
ORDER BY tmp.Date, tmp.HE ASC;
Como en el primer ejemplo aquí https://www.postgresql.org/docs/8.4/static/queries-with.html
