811
AUUS46 KPDT 071225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE OCT 7 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SE 1-7 MPH. N 3-6 MPH.
TRANSPORT WINDS SE 3-7 MPH. S 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED OCT 8 FAIR.
OUTLOOK FOR THU OCT 9 FAIR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 86 (POOR).
OUTLOOK FOR WED OCT 8 289 (POOR).
OUTLOOK FOR THU OCT 9 138 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-3 MPH. SE 4-7 MPH.
TRANSPORT WINDS NW 3-6 MPH. S 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED OCT 8 FAIR.
OUTLOOK FOR THU OCT 9 FAIR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 146 (POOR).
OUTLOOK FOR WED OCT 8 227 (POOR).
OUTLOOK FOR THU OCT 9 144 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 5-11 MPH. S 15-19 MPH.
TRANSPORT WINDS S 6-11 MPH. S 22-25 MPH.
MIXING HEIGHT 4000 FT MSL. 7000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED OCT 8 GOOD.
OUTLOOK FOR THU OCT 9 GOOD.
VENTILATION INDEX (CATEGORY) 132 (POOR). 798 (GOOD).
OUTLOOK FOR WED OCT 8 853 (GOOD).
OUTLOOK FOR THU OCT 9 649 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 6-11 MPH. NW 5-7 MPH.
TRANSPORT WINDS SE 7-14 MPH. S 8-13 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED OCT 8 FAIR.
OUTLOOK FOR THU OCT 9 FAIR.
VENTILATION INDEX (CATEGORY) 61 (POOR). 265 (POOR).
OUTLOOK FOR WED OCT 8 255 (POOR).
OUTLOOK FOR THU OCT 9 137 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 346 (FAIR)
ELLENSBURG 282 (POOR)
GOLDENDALE 178 (POOR)
TRI-CITIES 67 (POOR)
WALLA WALLA 175 (POOR)
YAKIMA 165 (POOR)
BEND 470 (FAIR)
PRINEVILLE 520 (FAIR)
ENTERPRISE 239 (POOR)
HERMISTON 25 (POOR)
JOHN DAY 555 (FAIR)
LA GRANDE 728 (GOOD)
MADRAS 386 (FAIR)
MEACHAM 475 (FAIR)
PENDLETON 147 (POOR)
REDMOND 472 (FAIR)
SENECA 501 (FAIR)
THE DALLES 186 (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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