387
AUUS46 KPDT 281225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI AUG 28 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 3-10 MPH. W 6-11 MPH.
TRANSPORT WINDS SW 5-10 MPH. W 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
VENTILATION INDEX (CATEGORY) 73 (POOR). 390 (FAIR).
OUTLOOK FOR SAT AUG 29 963 (GOOD).
OUTLOOK FOR SUN AUG 30 522 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-5 MPH. NE 3-7 MPH.
TRANSPORT WINDS NW 4-8 MPH. SW 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
VENTILATION INDEX (CATEGORY) 43 (POOR). 283 (POOR).
OUTLOOK FOR SAT AUG 29 908 (GOOD).
OUTLOOK FOR SUN AUG 30 251 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS N 0-3 MPH. NW 5-7 MPH.
TRANSPORT WINDS NW 3-6 MPH. SW 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT AUG 29 GOOD.
OUTLOOK FOR SUN AUG 30 GOOD.
VENTILATION INDEX (CATEGORY) 37 (POOR). 329 (FAIR).
OUTLOOK FOR SAT AUG 29 647 (GOOD).
OUTLOOK FOR SUN AUG 30 432 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-8 MPH. W 7-10 MPH.
TRANSPORT WINDS SW 6-10 MPH. W 9-13 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT AUG 29 GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
VENTILATION INDEX (CATEGORY) 83 (POOR). 331 (FAIR).
OUTLOOK FOR SAT AUG 29 916 (GOOD).
OUTLOOK FOR SUN AUG 30 539 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 473 (FAIR)
ELLENSBURG 715 (GOOD)
GOLDENDALE 603 (GOOD)
TRI-CITIES 361 (FAIR)
WALLA WALLA 362 (FAIR)
YAKIMA 256 (POOR)
BEND 533 (FAIR)
PRINEVILLE 460 (FAIR)
ENTERPRISE 468 (FAIR)
HERMISTON 419 (FAIR)
JOHN DAY 860 (GOOD)
LA GRANDE 336 (FAIR)
MADRAS 361 (FAIR)
MEACHAM 269 (POOR)
PENDLETON 332 (FAIR)
REDMOND 471 (FAIR)
SENECA 1050 (GOOD)
THE DALLES 684 (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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