593
AUUS46 KPDT 111225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT APR 11 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 5-10 MPH. SW 13-19 MPH.
TRANSPORT WINDS SW 7-12 MPH. W 15-20 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN APR 12 POOR.
OUTLOOK FOR MON APR 13 GOOD.
VENTILATION INDEX (CATEGORY) 114 (POOR). 748 (GOOD).
OUTLOOK FOR SUN APR 12 131 (POOR).
OUTLOOK FOR MON APR 13 970 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS SW 2-5 MPH. W 8-11 MPH.
TRANSPORT WINDS W 3-7 MPH. W 11-15 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SUN APR 12 POOR.
OUTLOOK FOR MON APR 13 GOOD.
VENTILATION INDEX (CATEGORY) 61 (POOR). 570 (FAIR).
OUTLOOK FOR SUN APR 12 158 (POOR).
OUTLOOK FOR MON APR 13 748 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 4-8 MPH. SW 6-10 MPH.
TRANSPORT WINDS S 10-13 MPH. W 9-11 MPH.
MIXING HEIGHT 4000 FT MSL. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN APR 12 FAIR.
OUTLOOK FOR MON APR 13 GOOD.
VENTILATION INDEX (CATEGORY) 199 (POOR). 440 (FAIR).
OUTLOOK FOR SUN APR 12 166 (POOR).
OUTLOOK FOR MON APR 13 566 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 4-8 MPH. W 9-17 MPH.
TRANSPORT WINDS SW 7-13 MPH. W 10-22 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN APR 12 POOR.
OUTLOOK FOR MON APR 13 GOOD.
VENTILATION INDEX (CATEGORY) 124 (POOR). 531 (FAIR).
OUTLOOK FOR SUN APR 12 114 (POOR).
OUTLOOK FOR MON APR 13 850 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 477 (FAIR)
ELLENSBURG 470 (FAIR)
GOLDENDALE 672 (GOOD)
TRI-CITIES 858 (GOOD)
WALLA WALLA 593 (FAIR)
YAKIMA 370 (FAIR)
BEND 625 (GOOD)
PRINEVILLE 439 (FAIR)
ENTERPRISE 756 (GOOD)
HERMISTON 779 (GOOD)
JOHN DAY 856 (GOOD)
LA GRANDE 452 (FAIR)
MADRAS 262 (POOR)
MEACHAM 297 (POOR)
PENDLETON 556 (FAIR)
REDMOND 439 (FAIR)
SENECA 1000 (GOOD)
THE DALLES 532 (FAIR)
METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS. BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.
THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS. A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
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