909
AUUS46 KPDT 041225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUN 4 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 12-24 MPH. SW 8-14 MPH.
TRANSPORT WINDS SW 14-24 MPH. SW 10-16 MPH.
MIXING HEIGHT 2000 FT MSL. 7000 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR FRI JUN 5 GOOD.
OUTLOOK FOR SAT JUN 6 GOOD.
VENTILATION INDEX (CATEGORY) 318 (FAIR). 679 (GOOD).
OUTLOOK FOR FRI JUN 5 1011 (GOOD).
OUTLOOK FOR SAT JUN 6 1050 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 4-8 MPH. W 3-7 MPH.
TRANSPORT WINDS W 6-11 MPH. W 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI JUN 5 GOOD.
OUTLOOK FOR SAT JUN 6 GOOD.
VENTILATION INDEX (CATEGORY) 123 (POOR). 393 (FAIR).
OUTLOOK FOR FRI JUN 5 1025 (GOOD).
OUTLOOK FOR SAT JUN 6 1050 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS W 1-3 MPH. NW 5-9 MPH.
TRANSPORT WINDS W 5-9 MPH. W 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI JUN 5 FAIR.
OUTLOOK FOR SAT JUN 6 GOOD.
VENTILATION INDEX (CATEGORY) 113 (POOR). 349 (FAIR).
OUTLOOK FOR FRI JUN 5 536 (FAIR).
OUTLOOK FOR SAT JUN 6 837 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 8-21 MPH. W 9-13 MPH.
TRANSPORT WINDS SW 12-20 MPH. W 11-15 MPH.
MIXING HEIGHT 2000 FT MSL. 6000 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR FRI JUN 5 GOOD.
OUTLOOK FOR SAT JUN 6 GOOD.
VENTILATION INDEX (CATEGORY) 273 (POOR). 565 (FAIR).
OUTLOOK FOR FRI JUN 5 825 (GOOD).
OUTLOOK FOR SAT JUN 6 1050 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 571 (FAIR)
ELLENSBURG 822 (GOOD)
GOLDENDALE 664 (GOOD)
TRI-CITIES 529 (FAIR)
WALLA WALLA 556 (FAIR)
YAKIMA 388 (FAIR)
BEND 281 (POOR)
PRINEVILLE 285 (POOR)
ENTERPRISE 309 (FAIR)
HERMISTON 794 (GOOD)
JOHN DAY 367 (FAIR)
LA GRANDE 417 (FAIR)
MADRAS 292 (POOR)
MEACHAM 383 (FAIR)
PENDLETON 688 (GOOD)
REDMOND 270 (POOR)
SENECA 427 (FAIR)
THE DALLES 717 (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.
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