November 30 2020

Did you see a ring around the moon last night? I got many messages and photos about it, some saying they’ve never seen it before.  The good news, this is more common than you might have guessed. This is the season for them, and they can actually help you forecast the weather.

Lunar Halo 

This first photo is from Jennifer Anderson. She wrote: “I’ve never seen a ring that big around the moon. Is there a scientific term or name for it?”

The term is a lunar halo, which is the ring of light around the moon. A full moon and approaching storm were the perfect combination to make this happen.

Lunar Halo Anderson



This photo from Lindsey Ellison came with this note: “Almost heavenly!! I have never seen this in all of my 45 years.”

When you see what causes it, you will be looking and I promise will see more. There are more photos below as well.

Lunar Halo Ellison


What Caused This Lunar Halo?

The short version, moon light through ice crystals refracted the light in the atmosphere.

  • We have a full moon, which gives us bright light at night.
  • We have a storm today, which was preceded by high thin clouds last night.
  • Those clouds were made of ice crystals that have a 60º angle to them.   The refraction bends the light 22º


The Science

Ice Crystals have fixed, rigid angles. The transparency lets the light pass through, but it slows down and bends on the way (refraction).

Lunar Halo Description2

Science behind ice crystals moon light and a lunar halo.



The Sky Set Up

This is more common in the winter season because:

  1. Larger storms often send the initial high thin clouds farther away. This can be 12 hours or up to 2 days before precipitation arrives.
  2. Longer nights allow more time to view the night sky.
  3. A moon phase larger than 1/4 and up to full will provide enough light to provide this effect.


The net result in the sky is a ring of light that is 22º

Lunar Halo Description

Lunar Halo science night sky clouds and ice crystals



Morning Weather Forecast: Rain Today and Snow Showers Tomorrow 


More Photos

From Bel Air, Maryland this was from Lori Fioramonti Decher.

Lunar Halo Delcher



Abigail Kait shared this photo her husband took while walking their dog.

“He says folklore hints at snow coming. Have you seen this happen or heard of it??”

The answer is yes!  This is called a Lunar Halo, and the folklore is correct. However, it depends on the temperature.  It will foretell of snow or rain in the next day or two.

Lunar Halo Kait



This photo from Jennifer Weinreich Stairs provides a great contrast with the line of trees.

Lunr Halo Stairs



Now Through December 1  ALL ITEMS are 20% OFF.

At Checkout use promo code:  SNOW20

Explore the site for Hoodies, hats, pants, kids stuff, and Snow Day Kits. This Faith in the Flakes thing began in with my son back in 2009 and you help keep it going. Thank you for your support and the over 300 schools who have invited me in for winter weather education programs.


FITF Hoodies SALE Dec 2020


I am a small business. Part of that is selling clothing that is produced and shipped by another small business in Carroll County: Maryland Print House.

We’ve joined forced and want to thank you for your support.



14 Local Maryland Pages (and York PA)

We have made a page for Maryland Weather which gives you the current conditions for 14 present area locations.

Local Hourly Forecasts and Local Radar
Central Maryland
Southern Maryland




National Weather Service Adds Maryland Cecil And Garrett Counties



Maryland Weather Page

Maryland Weather 

I wanted to keep it simple. Just the basics for a quick view at any time.

Maryland Weather Just In Weather


New Caps and Hats 

FITF Hats 2020


FITF Hat Winter Caps 2020



Also See:

My Final Winter Outlook: Snow Forecast

My Winter 2021 Outlook




My ‘bonus’ daughter Jaiden is showing off our popular Maryland Hoodie. Click here to see this and many other new items.

FITF MD Hoodie Jaiden




New Colors

We are giving 10% of each sale to Just In Power Kids: Providing FREE holistic care for pediatric oncology patients.



Winter Outlook Series

Winter Outlook 2021 Tropical Hints

Winter Outlook Polar Vortex Arctic Oscillation

Winter Outlook Solar Minimum

Early Winter October

Winter Outlook Series Weather Folklore


Winter Outlook 2021 La Nina Advisory

Winter Outlooks Farmers Almanacs



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