909
AUUS46 KPDT 151225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE SEP 15 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 0-5 MPH. N 4-8 MPH.
TRANSPORT WINDS S 3-6 MPH. N 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED SEP 16 FAIR.
OUTLOOK FOR THU SEP 17 FAIR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 131 (POOR).
OUTLOOK FOR WED SEP 16 313 (FAIR).
OUTLOOK FOR THU SEP 17 127 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-3 MPH. NE 3-7 MPH.
TRANSPORT WINDS NW 3-6 MPH. NE 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED SEP 16 FAIR.
OUTLOOK FOR THU SEP 17 POOR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 131 (POOR).
OUTLOOK FOR WED SEP 16 415 (FAIR).
OUTLOOK FOR THU SEP 17 150 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 1-4 MPH. NW 2-5 MPH.
TRANSPORT WINDS S 4-5 MPH. SW 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED SEP 16 FAIR.
OUTLOOK FOR THU SEP 17 FAIR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 235 (POOR).
OUTLOOK FOR WED SEP 16 496 (FAIR).
OUTLOOK FOR THU SEP 17 191 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 2-6 MPH. N 4-8 MPH.
TRANSPORT WINDS S 5-7 MPH. N 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED SEP 16 FAIR.
OUTLOOK FOR THU SEP 17 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 123 (POOR).
OUTLOOK FOR WED SEP 16 239 (POOR).
OUTLOOK FOR THU SEP 17 141 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 96 (POOR)
ELLENSBURG 89 (POOR)
GOLDENDALE 114 (POOR)
TRI-CITIES 139 (POOR)
WALLA WALLA 124 (POOR)
YAKIMA 169 (POOR)
BEND 312 (FAIR)
PRINEVILLE 339 (FAIR)
ENTERPRISE 207 (POOR)
HERMISTON 101 (POOR)
JOHN DAY 451 (FAIR)
LA GRANDE 217 (POOR)
MADRAS 260 (POOR)
MEACHAM 107 (POOR)
PENDLETON 159 (POOR)
REDMOND 367 (FAIR)
SENECA 541 (FAIR)
THE DALLES 217 (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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