311
AUUS46 KPDT 131225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU AUG 13 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS W 4-9 MPH. N 5-9 MPH.
TRANSPORT WINDS W 6-10 MPH. N 6-9 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 14 FAIR.
OUTLOOK FOR SAT AUG 15 POOR.
VENTILATION INDEX (CATEGORY) 84 (POOR). 381 (FAIR).
OUTLOOK FOR FRI AUG 14 419 (FAIR).
OUTLOOK FOR SAT AUG 15 197 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-4 MPH. E 2-6 MPH.
TRANSPORT WINDS NW 5-10 MPH. NE 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI AUG 14 POOR.
OUTLOOK FOR SAT AUG 15 FAIR.
VENTILATION INDEX (CATEGORY) 73 (POOR). 353 (FAIR).
OUTLOOK FOR FRI AUG 14 250 (POOR).
OUTLOOK FOR SAT AUG 15 236 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 2-6 MPH. NW 8-10 MPH.
TRANSPORT WINDS NW 4-8 MPH. NW 9-11 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI AUG 14 GOOD.
OUTLOOK FOR SAT AUG 15 GOOD.
VENTILATION INDEX (CATEGORY) 66 (POOR). 480 (FAIR).
OUTLOOK FOR FRI AUG 14 338 (FAIR).
OUTLOOK FOR SAT AUG 15 443 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 4-10 MPH. N 5-10 MPH.
TRANSPORT WINDS SW 7-12 MPH. NW 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 14 FAIR.
OUTLOOK FOR SAT AUG 15 FAIR.
VENTILATION INDEX (CATEGORY) 95 (POOR). 337 (FAIR).
OUTLOOK FOR FRI AUG 14 484 (FAIR).
OUTLOOK FOR SAT AUG 15 252 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 122 (POOR)
ELLENSBURG 249 (POOR)
GOLDENDALE 272 (POOR)
TRI-CITIES 448 (FAIR)
WALLA WALLA 272 (POOR)
YAKIMA 346 (FAIR)
BEND 421 (FAIR)
PRINEVILLE 502 (FAIR)
ENTERPRISE 463 (FAIR)
HERMISTON 383 (FAIR)
JOHN DAY 540 (FAIR)
LA GRANDE 487 (FAIR)
MADRAS 364 (FAIR)
MEACHAM 339 (FAIR)
PENDLETON 370 (FAIR)
REDMOND 482 (FAIR)
SENECA 623 (GOOD)
THE DALLES 245 (POOR)
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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