621
AUUS46 KPDT 181225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE AUG 18 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 6-16 MPH. W 9-15 MPH.
TRANSPORT WINDS SW 9-16 MPH. W 13-17 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR WED AUG 19 FAIR.
OUTLOOK FOR THU AUG 20 POOR.
VENTILATION INDEX (CATEGORY) 126 (POOR). 615 (GOOD).
OUTLOOK FOR WED AUG 19 373 (FAIR).
OUTLOOK FOR THU AUG 20 169 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 2-8 MPH. NW 3-7 MPH.
TRANSPORT WINDS W 5-10 MPH. W 6-11 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED AUG 19 FAIR.
OUTLOOK FOR THU AUG 20 FAIR.
VENTILATION INDEX (CATEGORY) 53 (POOR). 392 (FAIR).
OUTLOOK FOR WED AUG 19 217 (POOR).
OUTLOOK FOR THU AUG 20 153 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 0-2 MPH. NW 8-10 MPH.
TRANSPORT WINDS W 3-7 MPH. W 13-14 MPH.
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED AUG 19 GOOD.
OUTLOOK FOR THU AUG 20 GOOD.
VENTILATION INDEX (CATEGORY) 44 (POOR). 652 (GOOD).
OUTLOOK FOR WED AUG 19 382 (FAIR).
OUTLOOK FOR THU AUG 20 291 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-14 MPH. W 10-14 MPH.
TRANSPORT WINDS SW 9-16 MPH. W 15-18 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR WED AUG 19 FAIR.
OUTLOOK FOR THU AUG 20 FAIR.
VENTILATION INDEX (CATEGORY) 137 (POOR). 646 (GOOD).
OUTLOOK FOR WED AUG 19 363 (FAIR).
OUTLOOK FOR THU AUG 20 194 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 452 (FAIR)
ELLENSBURG 801 (GOOD)
GOLDENDALE 545 (FAIR)
TRI-CITIES 561 (FAIR)
WALLA WALLA 671 (GOOD)
YAKIMA 469 (FAIR)
BEND 549 (FAIR)
PRINEVILLE 529 (FAIR)
ENTERPRISE 808 (GOOD)
HERMISTON 683 (GOOD)
JOHN DAY 770 (GOOD)
LA GRANDE 691 (GOOD)
MADRAS 407 (FAIR)
MEACHAM 537 (FAIR)
PENDLETON 682 (GOOD)
REDMOND 601 (GOOD)
SENECA 893 (GOOD)
THE DALLES 537 (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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page