640
AUUS46 KPDT 171225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUL 17 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 6-13 MPH. W 10-14 MPH.
TRANSPORT WINDS SW 7-13 MPH. W 10-16 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI JUL 18 GOOD.
OUTLOOK FOR SAT JUL 19 GOOD.
VENTILATION INDEX (CATEGORY) 131 (POOR). 734 (GOOD).
OUTLOOK FOR FRI JUL 18 884 (GOOD).
OUTLOOK FOR SAT JUL 19 972 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-6 MPH. NW 6-9 MPH.
TRANSPORT WINDS NW 5-9 MPH. W 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI JUL 18 GOOD.
OUTLOOK FOR SAT JUL 19 GOOD.
VENTILATION INDEX (CATEGORY) 100 (POOR). 420 (FAIR).
OUTLOOK FOR FRI JUL 18 536 (FAIR).
OUTLOOK FOR SAT JUL 19 653 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 2-3 MPH. NW 10-12 MPH.
TRANSPORT WINDS SW 3-6 MPH. W 13-15 MPH.
MIXING HEIGHT 4000 FT MSL. 11000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI JUL 18 GOOD.
OUTLOOK FOR SAT JUL 19 GOOD.
VENTILATION INDEX (CATEGORY) 112 (POOR). 837 (GOOD).
OUTLOOK FOR FRI JUL 18 823 (GOOD).
OUTLOOK FOR SAT JUL 19 1049 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-12 MPH. W 10-14 MPH.
TRANSPORT WINDS S 10-13 MPH. W 14-16 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI JUL 18 GOOD.
OUTLOOK FOR SAT JUL 19 GOOD.
VENTILATION INDEX (CATEGORY) 195 (POOR). 816 (GOOD).
OUTLOOK FOR FRI JUL 18 909 (GOOD).
OUTLOOK FOR SAT JUL 19 1049 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 616 (GOOD)
ELLENSBURG 642 (GOOD)
GOLDENDALE 706 (GOOD)
TRI-CITIES 449 (FAIR)
WALLA WALLA 780 (GOOD)
YAKIMA 379 (FAIR)
BEND 947 (GOOD)
PRINEVILLE 836 (GOOD)
ENTERPRISE 965 (GOOD)
HERMISTON 806 (GOOD)
JOHN DAY 1050 (GOOD)
LA GRANDE 915 (GOOD)
MADRAS 699 (GOOD)
MEACHAM 596 (FAIR)
PENDLETON 930 (GOOD)
REDMOND 829 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 725 (GOOD)
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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page