Wind
You need to forecast ridge-top winds (both speed and direction) for your area of interest.
- Predict the average wind speed and direction over 6- or 12-hour time intervals
- Also produce a 24-hour average
- Use model-forecasted winds on constant pressure surfaces closest to ridge-top elevation
- If you break model forecasts of wind speed and direction into smaller time periods (3- or 6-hour), you can determine the duration and intensity of resultant wind loading more specifically
- Note changes in wind speed and direction over time
- If it’s snowing or if there’s fresh snow on the ground, adjust your forecasted snowfall depth higher for leeward slopes if the wind’s between 20 and 60 mph
- Note periods of calmer winds, especially at night with clear skies, since surface hoar can form