073
AUUS46 KPDT 171225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU SEP 17 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 0-5 MPH. SW 3-6 MPH.
TRANSPORT WINDS W 4-9 MPH. W 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI SEP 18 FAIR.
OUTLOOK FOR SAT SEP 19 POOR.
VENTILATION INDEX (CATEGORY) 33 (POOR). 105 (POOR).
OUTLOOK FOR FRI SEP 18 265 (POOR).
OUTLOOK FOR SAT SEP 19 136 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-5 MPH. W 2-5 MPH.
TRANSPORT WINDS NW 6-11 MPH. N 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI SEP 18 POOR.
OUTLOOK FOR SAT SEP 19 POOR.
VENTILATION INDEX (CATEGORY) 43 (POOR). 220 (POOR).
OUTLOOK FOR FRI SEP 18 150 (POOR).
OUTLOOK FOR SAT SEP 19 112 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. NW 3-5 MPH.
TRANSPORT WINDS N 6-10 MPH. N 6-10 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI SEP 18 GOOD.
OUTLOOK FOR SAT SEP 19 FAIR.
VENTILATION INDEX (CATEGORY) 38 (POOR). 121 (POOR).
OUTLOOK FOR FRI SEP 18 257 (POOR).
OUTLOOK FOR SAT SEP 19 202 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 1-5 MPH. W 3-6 MPH.
TRANSPORT WINDS S 4-7 MPH. W 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI SEP 18 FAIR.
OUTLOOK FOR SAT SEP 19 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 93 (POOR).
OUTLOOK FOR FRI SEP 18 317 (FAIR).
OUTLOOK FOR SAT SEP 19 148 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 65 (POOR)
ELLENSBURG 63 (POOR)
GOLDENDALE 157 (POOR)
TRI-CITIES 170 (POOR)
WALLA WALLA 91 (POOR)
YAKIMA 182 (POOR)
BEND 286 (POOR)
PRINEVILLE 226 (POOR)
ENTERPRISE 99 (POOR)
HERMISTON 98 (POOR)
JOHN DAY 61 (POOR)
LA GRANDE 92 (POOR)
MADRAS 174 (POOR)
MEACHAM 84 (POOR)
PENDLETON 127 (POOR)
REDMOND 235 (POOR)
SENECA 316 (FAIR)
THE DALLES 91 (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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