182
AUUS46 KPDT 311225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON AUG 31 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS E 1-5 MPH. N 6-11 MPH.
TRANSPORT WINDS E 3-6 MPH. NE 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 1 FAIR.
OUTLOOK FOR WED SEP 2 GOOD.
VENTILATION INDEX (CATEGORY) 31 (POOR). 239 (POOR).
OUTLOOK FOR TUE SEP 1 304 (FAIR).
OUTLOOK FOR WED SEP 2 671 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-3 MPH. E 3-7 MPH.
TRANSPORT WINDS NW 3-6 MPH. E 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR TUE SEP 1 FAIR.
OUTLOOK FOR WED SEP 2 GOOD.
VENTILATION INDEX (CATEGORY) 29 (POOR). 206 (POOR).
OUTLOOK FOR TUE SEP 1 378 (FAIR).
OUTLOOK FOR WED SEP 2 911 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SW 3-8 MPH. S 7-12 MPH.
TRANSPORT WINDS SE 4-8 MPH. S 11-14 MPH.
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR TUE SEP 1 GOOD.
OUTLOOK FOR WED SEP 2 FAIR.
VENTILATION INDEX (CATEGORY) 42 (POOR). 633 (GOOD).
OUTLOOK FOR TUE SEP 1 712 (GOOD).
OUTLOOK FOR WED SEP 2 384 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 4-9 MPH. N 6-11 MPH.
TRANSPORT WINDS SE 5-10 MPH. N 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 1 FAIR.
OUTLOOK FOR WED SEP 2 GOOD.
VENTILATION INDEX (CATEGORY) 42 (POOR). 208 (POOR).
OUTLOOK FOR TUE SEP 1 241 (POOR).
OUTLOOK FOR WED SEP 2 554 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 397 (FAIR)
ELLENSBURG 334 (FAIR)
GOLDENDALE 341 (FAIR)
TRI-CITIES 208 (POOR)
WALLA WALLA 182 (POOR)
YAKIMA 219 (POOR)
BEND 409 (FAIR)
PRINEVILLE 720 (GOOD)
ENTERPRISE 469 (FAIR)
HERMISTON 269 (POOR)
JOHN DAY 1050 (GOOD)
LA GRANDE 640 (GOOD)
MADRAS 245 (POOR)
MEACHAM 487 (FAIR)
PENDLETON 281 (POOR)
REDMOND 482 (FAIR)
SENECA 1050 (GOOD)
THE DALLES 370 (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.
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