One of the necessary tools a night (or landscape) photographer must have in their tool bag is a decent weather forecasting tool. Though I’ve been known to ignore the forecast for some events, like the Annular Solar Eclipse on Sunday, May 20th, I definitely am more inclined to go where the weather is clearer (Nevada) than where it will be cloudy (Crescent City, CA).
A forecast like this despite how detailed it seems to be is all but useless to me:
After all how partly is partly cloudy and how clear is clear? Besides, knowing how sunny it is during the day does not help me plan for the night, or sunrise for that matter. Indeed, the above is from Wunderground.com and shows “Clear” on Sunday, but when you dig down, well it ain’t so sunny after all – see below.
NOAA to the Rescue (no Ark)
Fortunately the US National Weather Service provides a nicely detailed “click point” forecast with charts of the hour-by-hour conditions.
There is quite a lot to take in here but it’s all good stuff.
Where do you find this great tool. Start here:
Once you get to the forecast, look for a link named : Hourly Weather Graph. It will be text only and cleverly hidden down and off the page where only a geek will find it. But that, my friend, is where the good stuff is. Before you rush off on the hourly thing, though, take a look at the little map window. You can get a forecast for any specific area by clicking! Here I started by searching for San Jose, CA, but then clicked on Los Gatos. If you’ve lived in the San Francisco Bay area you know that the temperature can be four, eight or ten degrees different in just 8 miles or so!
Wunderground Classic
Another tool I frequently use is the OLD WeatherUnderground. At Weather Underground they apparently decided that the most useful page was “too busy” and you have to go to “Wunderground Classic”.
A portion of a day looks like this. Note this is a portion of the same day that is marked “Clear” in the simple forecast shown earlier. Apparently it’s clear only at 2 am!
Good luck on your prognostication.
May the wind not be at your back or in your face, may the road not be muddied by rain and may the clouds gather only when you really want them i.e. at sunrise and sunset.
Hi Steven, I look forward to seeing what you captured of the eclipse yesterday. On the weather apps I learned about one that a prominent cinematographer in LA uses is My Cast. It gives you the option of live imagery to see cloud cover as well as atmospheric conditions at a quick glance in the field. Thanks for the article. Tom
I’ll have to look into My Cast a bit. However I needed forecasts that were accurate as far in advance as possible since driving hundreds of miles in the wrong direction would have been frustrating (to say it mildly).
As for my shots.. here is one:
![Annular Eclipse Sequence [C_040079+fives]](http://farm6.staticflickr.com/5275/7243353356_bff4c77186.jpg)
Steven, Great sequence image! From your favorite peak? Tom
Oops. Couldn’t be the Bay Area. Missed the annular shot in there at first glance. You were in the path.
Yep, I was in the zone of maximum annularity.
There is an unofficial NOAA app for Android phones which I use very frequently.
The Sky cover is a bit strange forecast since it does not seems to predict clouds per se but it may have included transparency forecast (water vapor in the air). Or it is just wrong most of the time. Because a few times it predicted sky cover where I had blue/clear sky bad some haze. For the location where I went for the eclipse it predicted 22% cloud cover but I had none and it was not that hazy.
Also keep in mind the cover/rain forecast usually means how many percent of the forecast area (even you select a certain point the forecast is for an area of 10squaremiles or more) receive cover/rain.
Even with this very nice detailed forecast from NOAA/NWS it is still a prediction and not 100% certain but nevertheless a very good guess.
In addition you can also use weather radars and forecast from clear dark sky charts.
And with jet stream forcast you can see when and where you have a big weather change coming (and for astronomy bad seeing): http://virga.sfsu.edu/scripts/namjetstream_model_fcst.html
“It is just wrong most of the time“… reminds me of the following:
“Dear Mr. Weatherman,
Thought I’d drop you a little note to let you know that I just finished shovelling 3 feet of ‘partly cloudy’ from my drive way“.
“… it is still a prediction and not 100% certain”
There are only two sure things in life: death and taxes. But at least death doesn’t get worse when congress meets.
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