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The current "Squall Line" automatically displays on your screen
after you enter your daily observation on the data screen.
 The Squall Line
(Disponible en anglais seulement)
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CoCoRaHS Blog | Go to end of message |
Our 2025 Ten-For-CoCoRaHS Year-End Fundraiser is off to a great start!
Please consider making a $10 donation. Matching gifts available!
Our annual CoCoRaHS year-end fundraiser is off to a great start. This significant event occurs once a year and accounts for approximately one-third of our operating budget. We thank all of you who have donated in the past and those who might consider making a gift this year for the first time. Our goal is $300,000 by January 11th. It's ambitious, but with your help, we have a good chance to achieve it. We are hoping for many first-time donors this year. CoCoRaHS is a 501(c)(3) non-profit network. Click here to DONATE We also have many matching funds still available via "challenge matches" offered by dozens of CoCoRaHS observers who will match your gift up to a certain amount in many areas of the country. The list is available on the donation portal near the bottom of the page. It is a great way to double your gift.
We are offering a special thank-you gift to all who donate $75 or more. This year, it is our CoCoRaHS "snowstorm" t-shirt, and it's rather striking. An indigo t-shirt with streaming white snowflake graphics. A long-sleeved version is available for donations of $125 or more (you can still choose a short-sleeved shirt instead). Shirts are mailed out a few weeks after your donation is received.
Thanks for your consideration and observations throughout the year,
The CoCoRaHS Headquarters Team
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Hilberg's Tips -- Winter Precipitation Types
Do you remember the difference between the different types of winter precipitation? Here's a review.
Snow is small white ice crystals formed when supercooled cloud droplets freeze. Snow crystals can have different shapes, usually dictated by the temperature at which they form.
Snow pellets, also called graupel, are white, opaque ice particles, round or conical in shape. They form when supercooled water collects on ice crystals or snowflakes. They typically bounce when they fall on a hard surface and often break apart.
Snow grains are tiny, white, opaque particles of ice, more flattened and elongated than snow pellets. Snow grains can be thought of as the solid equivalent of drizzle, or as I like to call it, "snizzle".
Ice pellets, or sleet, are small balls of ice. They form from the freezing of raindrops or the refreezing of melting snowflakes when falling through a below-freezing layer of air near the earth's surface.
For measurement purposes, all four are treated as frozen precipitation, and the snow measurement procedure should be followed.
Freezing rain occurs when rain occurs, and the surface temperatures are below freezing. The raindrops become supercooled as they fall through the layer of cold air near the surface and freeze upon impact with surfaces below freezing. Freezing rain is liquid precipitation and should be measured as you would measure rain, after you have melted the ice in your rain gauge (do not measure any of the ice on the outside of your cylinder). You can report the thickness of ice on surfaces in your observation comments.
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