The forecasts are updated approximately every 12 hours: once
around midnight and once around noon each day. However, we cannot
guarantee the time of the update.
Each update renews the forecasts for the next 48 hours starting
from midnight or noon. Since we cannot guarantee the time of the
update, the forecasts are only approximately for the next 48
hours; sometimes shorter, sometimes longer.
There is a date and time stamp at the bottom of each forecast
plot. This shows the end of averaging time. For example, if
the stamp is "May 1, 2009 13:00:00 (EST)" for an hourly average, you
are looking at the average from noon to 13:00 (Eastern Standard
Time) on May 1, 2009.
Three days of the week are listed. The first two days have 24 hours
numbered from 1 to 24; the third day has only 12 hours. Click on one of the hour buttons under
the listed days. What you will get is an average ending at the hour you selected. For
example, if you are looking at 1-hr averages and you picked hour
"13" under the second day, you will see the hourly average from noon to
13:00 (EST) for that day.
The listed days are for the days of the current week. Typically,
the first day is today, the second day is tomorrow and
the third day is the day after tomorrow. However, this is not always the case.
(Night owls should watch out!) If the midnight update took place
before midnight then the first day is tomorrow. The noon update will
usually take place before midnight so the first day is typically today
during daylight hours. If it is not, the forecast was not updated
due to technical difficulties.
The best way is to look at the listed days and check the date and
time stamp at the bottom of forecast plots.
Around midnight, check the first listed day. If it is actually before midnight and the
first day listed is tomorrow, or if it is after midnight and the
first day is
today, then the midnight update took place. Note that, since our
forecasts are for the next 48 hours, there will be no data for the
day after tomorrow at this point in time.
Around noon, check the forecast for the day after tomorrow. If
there is data for the day after tomorrow then the
noon update took place.
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