690
AUUS46 KPDT 281225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON SEP 28 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 1-7 MPH. W 4-8 MPH.
TRANSPORT WINDS S 4-8 MPH. W 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 29 GOOD.
OUTLOOK FOR WED SEP 30 POOR.
VENTILATION INDEX (CATEGORY) 31 (POOR). 227 (POOR).
OUTLOOK FOR TUE SEP 29 695 (GOOD).
OUTLOOK FOR WED SEP 30 191 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 0-3 MPH. SE 3-7 MPH.
TRANSPORT WINDS W 3-6 MPH. SW 6-9 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 29 FAIR.
OUTLOOK FOR WED SEP 30 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 161 (POOR).
OUTLOOK FOR TUE SEP 29 382 (FAIR).
OUTLOOK FOR WED SEP 30 157 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 1-4 MPH. NW 5-9 MPH.
TRANSPORT WINDS NW 4-8 MPH. NW 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 29 FAIR.
OUTLOOK FOR WED SEP 30 FAIR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 253 (POOR).
OUTLOOK FOR TUE SEP 29 451 (FAIR).
OUTLOOK FOR WED SEP 30 257 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 3-7 MPH. W 4-6 MPH.
TRANSPORT WINDS S 6-8 MPH. W 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE SEP 29 GOOD.
OUTLOOK FOR WED SEP 30 FAIR.
VENTILATION INDEX (CATEGORY) 37 (POOR). 192 (POOR).
OUTLOOK FOR TUE SEP 29 694 (GOOD).
OUTLOOK FOR WED SEP 30 228 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 408 (FAIR)
ELLENSBURG 349 (FAIR)
GOLDENDALE 338 (FAIR)
TRI-CITIES 266 (POOR)
WALLA WALLA 194 (POOR)
YAKIMA 152 (POOR)
BEND 238 (POOR)
PRINEVILLE 217 (POOR)
ENTERPRISE 221 (POOR)
HERMISTON 223 (POOR)
JOHN DAY 304 (FAIR)
LA GRANDE 290 (POOR)
MADRAS 165 (POOR)
MEACHAM 192 (POOR)
PENDLETON 190 (POOR)
REDMOND 230 (POOR)
SENECA 381 (FAIR)
THE DALLES 344 (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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