409
AUUS46 KPDT 311225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN MAY 31 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 9-17 MPH. W 5-9 MPH.
TRANSPORT WINDS SW 9-17 MPH. W 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR MON JUN 1 FAIR.
OUTLOOK FOR TUE JUN 2 FAIR.
VENTILATION INDEX (CATEGORY) 191 (POOR). 457 (FAIR).
OUTLOOK FOR MON JUN 1 488 (FAIR).
OUTLOOK FOR TUE JUN 2 389 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 4-9 MPH. W 2-5 MPH.
TRANSPORT WINDS W 6-11 MPH. NW 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR MON JUN 1 FAIR.
OUTLOOK FOR TUE JUN 2 FAIR.
VENTILATION INDEX (CATEGORY) 108 (POOR). 323 (FAIR).
OUTLOOK FOR MON JUN 1 607 (GOOD).
OUTLOOK FOR TUE JUN 2 372 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS W 1-3 MPH. NW 7-13 MPH.
TRANSPORT WINDS W 4-8 MPH. NW 8-13 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON JUN 1 GOOD.
OUTLOOK FOR TUE JUN 2 GOOD.
VENTILATION INDEX (CATEGORY) 109 (POOR). 427 (FAIR).
OUTLOOK FOR MON JUN 1 601 (GOOD).
OUTLOOK FOR TUE JUN 2 395 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 6-16 MPH. W 6-8 MPH.
TRANSPORT WINDS SW 9-16 MPH. W 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR MON JUN 1 FAIR.
OUTLOOK FOR TUE JUN 2 FAIR.
VENTILATION INDEX (CATEGORY) 178 (POOR). 383 (FAIR).
OUTLOOK FOR MON JUN 1 461 (FAIR).
OUTLOOK FOR TUE JUN 2 346 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 471 (FAIR)
ELLENSBURG 793 (GOOD)
GOLDENDALE 391 (FAIR)
TRI-CITIES 376 (FAIR)
WALLA WALLA 362 (FAIR)
YAKIMA 423 (FAIR)
BEND 286 (POOR)
PRINEVILLE 308 (FAIR)
ENTERPRISE 323 (FAIR)
HERMISTON 411 (FAIR)
JOHN DAY 391 (FAIR)
LA GRANDE 443 (FAIR)
MADRAS 277 (POOR)
MEACHAM 313 (FAIR)
PENDLETON 389 (FAIR)
REDMOND 299 (POOR)
SENECA 460 (FAIR)
THE DALLES 509 (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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