Are you looking for the Best Ski Season forecasts and Now summer biking and hiking Forecasts

Read more about the developing El Nino and the launch of our summer forecasts.
Opensnow Forecasts

El Nino Update

Welcome, El Nino! Ocean water temperatures reached 1.3 degrees Celsius above average in the “Nino 3.4 region” of the ocean. This means that we are pushing toward a “moderate” El Nino. Look at the red colors below, showing warmer-than-average water.
Why does El Nino matter for us skiers and riders? Changes in ocean water temperature in the Pacific Ocean affect weather patterns around the world. If El Nino maintains its strength into next winter, it could be good news for some regions of North America. For more, read these recent posts about El Nino’s affect on Tahoe and Utah.

Sign Up for Summer Forecasts (finally!)

You’re not just a skier. Summer in the mountains is fun, too!
That’s why we are starting…48f0d21d-48a5-4a97-ba4b-5786b94360ee.pngHow will these forecasts help you? By answering questions like:

  • Which weekend day or mountain range will have fewer storms?
  • What time will the lightning threat increase? (the answer is NOT always “noon”)
  • In what direction should I look to keep an eye on approaching storms?

Access these forecasts by signing up for our summer email list.

  • Expect one email per week, delivered on Thursday morning.
  • This timing will help you plan your weekend.
  • Emails will start next Thursday, June 11th.
Sign Me Up for Colorado Summer Forecasts!
Should I sign up for these forecasts?

  • Yes, if you hike, bike, or climb in the summer.
  • Yes, if you do these things in Colorado.
  • No, if you’re outside of Colorado. We will add other locations soon.

When to expect our next email?

Summer forecasts will ONLY be sent to our summer email list. If you’re in Colorado, sign up for that by clicking the button above.This is the Opensnow email newsletter, and it will visit your inbox again in July or August to share an update about El Nino plus expansion plans to bring our summer forecasts to other regions. Until then, enjoy your time playing in the mountains!– Joel Gratz, Founding Meteorologist, Chief Powder Officer

The Forecasters of OpenSnow

Colorado Daily Snow
Tahoe Daily Snow
Utah Daily Snow
Northwest Daily Snow
Vermont & Northern New York Daily Snow
New Hampshire & Maine Daily Snow
I-70 Travel Forecast
Upper Midwest Daily Snow



ASTM standard I abstained on is a guaranteed lawsuit starter

I’m hurt because you did not check the weather correctly!

So this is the new standard that I was asked to vote on recently.

Withdraw With Replacement to F2993-2013 Guide for Monitoring Weather Conditions for Safe Parasail Operation WK47376 PDF (8.0K)



(386) 547-6067

When I don’t fully understand the issues or have not seen the actual standard (yes it is a little crazy trying to read what you are voting on sometimes) I abstain. I did so on this standard also.

Besides voting against a standard requires you to articulate the reasons why you are voting no on the standard. “This is stupid,” is not a good reason according to the ASTM. Nor is “this is going to help plaintiff’s win lawsuits” a valid reason for voting no.

However, can’t you see this doing nothing but creating legal nightmares.

“You said you checked the weather, and you said to launch, but the wind changed because a front moved/truck came by/that is what the wind does, and I crashed. You owed me a duty to check the weather; that duty is in writing, and you agreed to it by becoming a member of the ASTM and agreeing to the standard (or not agreeing to the standard; you are still held to the standard), and my injuries are a result of you not following the standard.”


Somewhere, the ASTM, there is an idea that the creation of standards stops lawsuits, but even the ASTM can’t show any proof of that.

What do you think? Leave a comment.

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Mountain Weather Workshop: Nov 2-4: Its getting to be that time of year!!!!

Mountain Weather Workshop

Avalanche On Ozone

Register online here:

The Colorado Avalanche Information Center (CAIC) and the Silverton Avalanche School are offering a three day workshop on Mountain Meteorology. Morning sessions

will provide a basic understanding of meteorological principles applied to weather in mountainous areas. Afternoon sessions will focus on using publicly available weather information to create a local forecast. Participants will interact with experienced weather forecasters and work in small groups to generate and present their own forecasts. The workshop is designed for avalanche practitioners and avid recreationalists. Anyone interested in mountain weather phenomena is welcome and no previous meteorological education is required. Participants are encouraged to bring their own laptop computer with wireless capability for the small group exercises.

This course is intended for anyone who wants a deeper understanding of weather processes and the products available for forecasting. Ski patrol, mountain guides, avalanche forecasters, natural resource managers, avid recreationalists and mountain pilots would all benefit from this course.

Dr. John Snook, Mountain Weather and Avalanche Forecaster, CAIC – Boulder
Dr. Ethan Greene, Director, CAIC

Students receive a mountain weather workbook as a part of the course. We highly recommend bringing a laptop with wireless networking capability.

Workshop Summary

A commonly practiced weather forecast strategy is to take a systematic approach to organizing forecast information by spatial scale. The approach starts by analyzing large-scale hemispheric information and then working downscale to high-resolution information. The workshop schedule reflects this strategy with a focus on big picture weather basics and phenomena on day one, followed by regional-scale weather on day two, and then mountain-scale weather on day three. Morning sessions will provide an understanding of meteorological systems at these particular scales. Afternoon sessions will apply this understanding to prediction techniques typically used by professional weather forecasters. Participants will gain practical skills through small group forecast preparation exercises at the end of each day.

Course Goals:

English: I took this picture on May 2006, on m...
• Provide a basic understanding of meteorology
• Apply that understanding to mountain weather
• Learn mountain weather forecasting techniques

Specifically, the Mountain Weather curriculum addresses:
• A general approach to weather forecasting
• Basic forecasting strategies and processes
• Meteorology basics
• Observational meteorology components
• Introduction to weather computer models
• Hemispheric to regional to mountain scale weather processes
• Precipitation mechanics
• Interpretation of weather products

Upon completion of the course, students will have had the opportunity to:
• Learn and utilize a framework and checklist for mountain scale weather forecasting
• Access and interpret available weather resources and models in forecasting exercises
• Develop a list of resources and forecasting approach to a specific area(s) of interest

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