How to (Hopefully) Find Clear Skies for Tonight’s Total Lunar Eclipse

We’ve arrived at eclipse day, so now the big question is, will it be clear? My favorite forecast for major astronomical events reads something like this: Fair skies tonight with light winds and lows in the middle 50s.While I hope that’s exactly what’s predicted for your town, in my corner of the world we’re expecting “increasing clouds with a chance for thunderstorms”.

That’s just not nice. Same by you? Here’s how to find that clear spot if you’re facing bad weather tonight.

One of my favorite cloud-checking sites is the GOES East view of the U.S., Canada and Central America taken from geostationary orbit. Credit: NASA
One of my favorite cloud-checking sites is the GOES East view of the U.S., Canada and Central America taken from geostationary orbit. This map shows the scene at 10:45 a.m. CDT this morning. Credit: NASA

I usually check the GOES (Geostationary Operational Environmental Satellite) images that weather forecasters use to display and animate the movement of clouds and weather fronts during the nightly newscasts. Once I know the location and general drift of the clouds, I get in a car and drive to where it’s likely to either remain or become clear. Depending on the “magnitude” of the event I might drive 50 to 150 miles. If nothing else, doing astronomy guarantees many adventures.

GOES West view of the western U.S., Canada and Hawaii taken at 11 a.m. CDT. Credit: NASA
GOES West view of the western U.S., Canada and Hawaii taken at 11 a.m. CDT. Credit: NASA

You’ll find these most helpful images at either the GOES East site, which features a photo of the entire mainland U.S., Central America and much of Canada, updated every 15 minutes. Since the satellite taking the photos is centered over the 75° west parallel of longitude, its focus is primarily the eastern two-thirds of the U.S. and Canada. For the western U.S., western Canada and Hawaii, head over to the GOES West site.

After you set the width and height to maximum values, you'll get a picture like this which was taken at 11 a.m. CDT and features the upper and lower Midwest. Credit: NASA
After you set the width and height to maximum values, you’ll get a picture like this, taken at 11 a.m. CDT. Credit: NASA

Once there, you’ll be presented with a big picture view of the U.S., etc., but you can click anywhere on the map for a zoomed-in look at a particular region. Before you do, set the “width” and “height” boxes to their maximum values of 1400 (width) and 1000 (height). That way you’ll get a full-screen, nifty, 1-kilometer image when you go in close. All images have a time stamp in the upper left corner given in Universal or Greenwich Mean Time (GMT). Subtract 4 hours to convert to Easter Daylight; 5 for CDT; 6 for MDT and 7 for PDT.

You can check back all day long for fresh photos and watch the march of the clouds over time. Or you can have the site assemble up to 30 of the most recent images into an animation loop and watch it as a movie. Combing current photos, the animation and your local forecast will inform your plans about whether to remain at home to watch the eclipse or get the heck out of town.

Infrared image of the east-central U.S. at 11 a.m. CDT today. Credit: NASA
Infrared image of the east-central U.S. at 11 a.m. CDT today. Clouds can be seen and tracked at night using the infrared channel on the GOES East and West sites. Credit: NASA

When night arrives, you can still get a reasonably good idea of where the clouds are and aren’t by clicking on the infrared channel link at the top of the site. I also like to use the NCAR (National Center for Atmospheric Research Real-Time Weather Data) site. They offer a black and white infrared option that provides a clearer picture. At the site, select your “channel” then click on one of the regional acronyms on the interactive U.S. map.

So far, we’ve been talking about the weather in real time. When it comes to forecasts, one of the most useful tools of all and a true godsend to amateur astronomers is Attilla Danko’s ClearDarkSky site. Click on the Clear Sky Charts link to access interactive charts for thousands of locations across the U.S., Canada and parts of Mexico. For example, if you click on Illinois, you’ll get a list of sky conditions for 105 locations throughout the state. The Chicago link pops up six rows of data-packed squares with colors ranging from deep blue to white.

The cloud cover forecast for Chicago for the next day as depicted in Attilla Danko's Clear Dark Sky site. Copyright: Attilla Danko
The cloud cover forecast for Chicago today Sept. 27 through early Tuesday Sept. 29 as depicted in Attilla Danko’s Clear Dark Sky site. The forecasts can be sponsored for a donation by various groups or individuals. This one is by the Chicago Astronomical Society. Copyright: Attilla Danko

The first row indicates cloud clover with varying shades of blue representing the percentage of clear sky. Medium blue means partly cloudy; white indicates 100% overcast. Additional data sets include sky transparency, seeing conditions, hours of darkness, wind, temperature and humidity. While no forecast is 100% accurate, the reliability of the models Danko uses makes Clear Sky Charts one of best tools available for skywatchers. Want a real treat? If you click on one of the squares in the Cloud Cover row, a large image showing cloud cover at the time will pop up. You’ll also find another, more general interactive cloud forecast graphic at

Thanks to a helpful reader suggestion, I recently learned of Clear Outside, a forecasting site similar to Clear Sky Charts but worldwide. Be sure to check it out. Satellite imagery like the U.S. GOES East and West is available for European and African observers at Sat24.

So what does the U.S. look like for weather tonight? Mostly clear skies are expected from New York State up through Maine, across the center of the country, the desert Southwest and the Northwest. Expect partly cloudy conditions (with some mostly cloudy spots) for the Upper and central Midwest, and mostly cloudy to overcast skies in the southern and southeastern seaboard states.

But who knows? By using these sites, you might just improve your chances of seeing what promises to be a spectacular lunar eclipse tonight. Some of you reading this undoubtedly have your own favorite weather hangouts. Please share them with us in the comments section. The more the merrier!

As always, if you’re completely shut out, here are a few sites where you can watch it live on the Web:

9 Replies to “How to (Hopefully) Find Clear Skies for Tonight’s Total Lunar Eclipse”

  1. Disappointingly US-centric article. All your links and emphasis is on the USA. The eclipse is visible in Europe too!

    1. Stockport,
      Sorry, but I’m not as familiar with European sites and unaware of any site like Clear Dark Sky in Europe. The coverage included not just the U.S. but also Canada and Mexico. I did include the Sat24 link for European observers as well as a call-out for readers to submit their own favorites. You may have missed it. All that said, if you have sites you think would be helpful for European readers, please send them to me at: [email protected] and I would be most happy to include them.

    1. Just went to the Clear Sky Chart and typed in my location/co-ordinates… and BINGO got the report. THAT is just so WAY double extra groovy cool and a handy tool to boot! ThanxX2!

  2. Bob conditions in Europe are Perfect and because the (full) Moon is the closest to Earth in 30 years it looks 14% Bigger and 30% Brighter and it is Already turning colour this will go Blood Red in a Couple of hours and will finish at 06:24 am BST (add one hour for mainland Europe) I am in Belgium in my Garden Astro Party conditions are Perfect (wish you were all here lol) Don’t Miss It the next Supermoon Total Eclipse is in 2033AD so enjoy this one and I Hope Bob gets some Great Photo Shots Good Luck in USA….

    1. UFOs,
      Woo-hoo! I kept watch on the clouds, drove southeast into Wisconsin and had clear skies for much of the eclipse. Rather dark to me – Danjon L=2. Glad it was clear in Belgium 🙂

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