Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >

Mountain Rain or Snow - Precipitation Phase Citizen Science Project

Mountain Rain or Snow Project

Normally, we think of rain falling at air temperatures above 32°F – but in the world of weather forecasting and hydrologic prediction, that isn’t always the case. In some mountainous regions, the shift from snow to rain during winter storms may actually occur at warmer temperatures approaching 39.5°F. Scientists use temperature thresholds to determine where and when a storm will transition from rain to snow, but if that threshold is off, it can affect our predictions of flooding, snow accumulation, and avalanche hazard.

Mountain Rain or Snow is a NASA-funded project that engages citizen scientists in app-based precipitation phase reporting to help improve our understanding of the rain-snow transition temperature in mountain regions.

We here at NWS Grand Junction are reaching out on behalf of the Mountain Rain or Snow team to invite you to join the community of observers who are working to improve estimates of snow accumulation and rainfall.

Participating is simple: text COrainsnow to 855-909-0798 to access the web app and learn a few tips. Then, during winter storms, keep your eyes on the sky and send observations whether it is raining, snowing, or a wintry mix.

With your observations, scientists at Lynker, the Desert Research Institute, and the University of Nevada, Reno are working to better estimate how much water falls during winter. This is difficult with current technology, especially in the mountains, so we need observations from all over the region. If you want to learn more about the project, visit https://rainorsnow.org/about

When you sign up, you’ll receive 3 intro texts over the first 3 days, including the first one prompting you to download the free Mountain Rain or Snow web app. Afterwards, we’ll only send you alerts when there is a winter storm in the region.

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