Quoted message said:Phil M. said:Weather.com works for me for 10-day forcasts and hourly forcasts. For
current conditions weather.lycos.com works. The readings are more current
at Lycos.
The problem I see with using online readings is they are
not always valid.
They're probably valid for the station location.
It would depend on how far you live from
Quoted message said:the "official" weather station.
But, as you point out, it may not be valid for where you are running.
FWIW, depending on where I'm running, I use either thermometer at my
house, lab, or center of town and/or weatherunderground.com (seems to
coincide with Weather Service). I use the local weather location as well
as some of the surrounding ones, esp. the one upstream (where the wind
storms and rapidly increasing temperatures usually come from). There are
gradients among the various locations that may be small or large,
depending on the weather pattern. I just kinda guesstimate within that.
I've got one of those zipper thermometers, but rarely use it. Weather
can vary over a couple hour run, esp. if going from fields to forest and
back again - so I've just been picking a number that seems to represent
the run and make additional comments in my comments section.
I used to fly, so for wind, I use "official" wind velocity values plus
observations on flags, trees, and herbaceous vegetation for guesstimates
where I am - and it varies across the time and space variation of my run.
Just to give you an example,
Quoted message said:two days ago, weather.com told me it was raining in my
city. I couldn't see it in my area. Apparently, it was
raining indeed a few miles away.
Not unusual. I'll spare the details, but my town is near the junction of
2 glacial valleys (yes, they still have glaciers upstream). Winds blow
out of the one in winter, and the other in summer, and sometimes both.
Windsocks at different ends of the airport at junction show different
directions, and the grass may indicate a different direction still - all
within a mile. Abrupt changes in weather are not unusual around here.
Quoted message said:
Also, I'm not sure (anyone care to enlighten me?) about the
temperature that online sites report - is it the temperature
in the shade or under the sun?
Official weather stations are usually housed in white shelter at a
certain height - so it should approach that of the shade. I'm sure
there's a bunch of specs associated with official weather stations but
they didn't pop up with a quick google.
http://www.novalynx.com/fireweather.html
http://i4weather.net/wxpic8.jpg
I would think it's in the shade.
Quoted message said:Last week, I measured 118F under the sun using a weather thermometer
but when I went back and checked online, it was only in the high 90's.
So, if I were to do a run on the road, which would presumably be
under the sun, I would be wrong if I went by the online reading.
Actually, you might look at "real feel" temperatures of Accuweather.com
http://www.accuweather.com/iwxpage/adc/help/pr_realfeel_pr.htm
(I think I've got a better link somewhere but it hasn't reappeared since
I switched computers)
While it sounded hoaky to me originally, as I understand it, it takes
into account (proprietary formula) wind, humidity (or dew point, can't
remember which), direct sun, etc, so may have some validity for running
(the better link has a better description and inspired a little more
confidence). For instance, I find 0F to feel colder in dark than in
daylight - no sun on me. Bob G. may have some comments.
I use weatherunderground most of the time since it seems to coincide
with the weather service most of the time, not that that makes it any
more "right" - just that I'm pretty sure I know where the official
stations are locally, but not sure where accuweather gets theirs, so
I've got a better feeling for the value of the data.
Hey, you asked 😉
Dot
who learned quickly when the reporting station for an airport is
sheltered so it doesn't reflect the wind on the airport