Soap Box:
When you check the forecasts above,
you will immediately notice that they do not agree, sometimes dramatically.
There is nothing I can do about that, of course. You might be interested
to know that when I'm in Jerusalem, and I click on the above forecasts,
I'm impressed with how wrong they are! So I wonder . . .
QUESTION:
Forecasters only give us a computer generated percentage chance that it
might rain today or tomorrow, right? Wouldn't it be much more helpful and
honest to also share the chance (probability) that their predictions
will turn out to be right? Why don't they do that?
MY SELF-RIGHTEOUS ANSWER:
They do not want us to have proof of what we already suspect, that forecasting
is not as accurate a science as we are led to believe. The unfortunate
truth it seems to me is that weather announcers/web sites sell uncertain
forecasts with as much certainty as they can muster.
A guy on the Weather Channel claims
that 24-hour forecasts today are 90% accurate. I don't know if that includes
temperature and precipitation or what. He didn't say. Neither did he say
how this number was calculated or what margin of error was used.
A local Jackson, Mississippi forecaster
claims his forecasts are 95% accurate (David Hartman). Surely he doesn't
mean his 5-day forecast is 95% accurate!? Can any meteorologist deny that
reliability decreases significantly as they attempt to forecast 2, 3, and
4 days into the future?
Therefore, the forecasters do not
disclose daily forecast accuracy because people might lose faith in forecasting.
TV ratings might fall. Sponsors might leave. People could lose money or
lose their jobs. You get the picture.
P.S.
If you are in junior high, and you need a science project idea, why not
record a forecaster's Sunday predictions for a given week. Then chart what
the weather actually was for that week. Determine percentage forecast accuracy
1, 2, 3, 4, 5, 6, and 7 days into the future. If forecasters won't disclose
the stats, a student could do it for them!
Thank you for joining me on the
Soap Box!