National Weather Service United States Department of Commerce

Cool and Dry in the East; Turning Stormy in the Northwest

Much cooler temperatures behind a cold front will bring a feeling of fall to the East Coast today. In addition, an active fall storm pattern developing in the Pacific Northwest this week will bring areas of heavy rain and high elevation snow. Northern California will benefit from rainfall this week that will aid firefighters given the recent large wildfires. Read More >

We want you to become an official CoCoRaHS Observer!

What is CoCoRaHS?

CoCoRaHS is the Collaborative Rain, Hail, and Snow network, a non-profit sponsored by NOAA, the National Science Foundation, and many others. It is a network of over 20,000 volunteer observers of rain, snow, and hail across North America.

Why should I join CoCoRaHS?

  • We need your weather reports! While our radar is great, when it comes to observing rain, hail, and snow, there's nothing better than human observer. Your observations help us fill in the gaps between other observation sites and can help us better understand what happened at your precise location.
  • "The rain doesn't fall the same on all!" In both summer and winter, local effects can cause dramatic differences in rain and snow. Your reports will help us better understand these differences and in turn help us produce a better forecast!
  • It's fun to track the weather!

How does CoCoRaHS work?

  • After securing the necessary equipment, CoCoRaHS observers are asked to observe each day at the same time - most observers report around 7am, and this is what we recommend. CoCoRaHS observers should report every day even if no precipitation fell - those "zero" reports are very helpful for monitoring drought!
  • In addition to daily observations, CoCoRaHS observers should also send a significant weather report if heavy rain/snow or hail is occurring. These reports are sent immediately to our office and are very important because they provide us much needed information to issue severe weather statements such as flash flood warnings

Is there training available?

Yes! There are a few short training presentations available from CoCoRaHS to help you accurately measure rain, snow, and hail. Visit the CoCoRaHS Help Page for more information. (If you have any questions you're always welcome to contact us as well!)

How do I sign up?

Visit the CoCoRaHS website to sign up! (CoCoRaHS is open to Canadian citizens, too!) You will need to purchase a rain gauge (~$30) - CoCoRaHS uses a standard 4" rain gauge to ensure observations are measured the same everywhere. You'll also need a snow board to measure snow as well as a measuring stick. Need help? We're happy to assist you!

 

For more information about CoCoRaHS March Madness, including tracking how many observers each state has recruited so far, visit the CoCoRaHS March Madness 2017 page.