NWS Pendleton Forecasts & Briefing Hub (2024)

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The Ventilation Index (also known as the Clearing Index) is defined as the Mixing Height (depth of the mixed layer in 100's of feet above ground level) multiplied by the Transport Wind (average wind in the mixed layer in knots) and is represented by the following equation VI= (Mix Hght/100) x Trans Wind. Values between 0 and 300 generally represent poor dispersion, 300 and 600 fair dispersion, and 600-1000 good dispersion. However, smoke management agencies are encouraged to develop criteria that are suitable and representative of dispersion conditions in their local area. If you have any questions about this product please contact the National Weather Service Office in Pendleton, Oregon at 541-276-7832..

The Daily Dispersion Outlook is available here: .

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NWS Links and Resources:

• Storm Prediction Center
• Weather Prediction Center
• Latest River Conditions and Forecast
• Latest Long-Range Flood Risk
• NOAA’s National Weather Service Water Resources Information on the Web A Manual for Users

Mountain Snowpack Information from the NRCS:

• WA Water Year to Date Basin-Filled Map - Percent of Median Map
• WA SNOTEL Current SWE % of Normal - Basin-Filled Map
• WA Current SWE SNOTEL Map - Percent of Median
• WA Month-to-Date SWE SNOTEL Map - Percent of Median
• WA Water Year to Date SWE SNOTEL Map - Percent of Median
• OR Water Year to Date Basin-Filled Map - Percent of Median Map
• OR SNOTEL Current SWE % of Normal - Basin-Filled Map
• OR Current SWE SNOTEL Map - Percent of Median
• OR Month-to-Date SWE SNOTEL Map - Percent of Median
• OR Water Year to Date SWE SNOTEL Map - Percent of Median