134
AUUS46 KPDT 231225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED SEP 23 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 4-10 MPH. W 4-8 MPH.
TRANSPORT WINDS SW 7-12 MPH. SW 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU SEP 24 POOR.
OUTLOOK FOR FRI SEP 25 GOOD.
VENTILATION INDEX (CATEGORY) 68 (POOR). 237 (POOR).
OUTLOOK FOR THU SEP 24 120 (POOR).
OUTLOOK FOR FRI SEP 25 791 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 0-5 MPH. SE 1-5 MPH.
TRANSPORT WINDS NW 3-7 MPH. SW 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU SEP 24 POOR.
OUTLOOK FOR FRI SEP 25 GOOD.
VENTILATION INDEX (CATEGORY) 27 (POOR). 126 (POOR).
OUTLOOK FOR THU SEP 24 106 (POOR).
OUTLOOK FOR FRI SEP 25 829 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS E 0-2 MPH. NW 1-3 MPH.
TRANSPORT WINDS SW 3-6 MPH. SW 4-6 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU SEP 24 GOOD.
OUTLOOK FOR FRI SEP 25 GOOD.
VENTILATION INDEX (CATEGORY) 26 (POOR). 136 (POOR).
OUTLOOK FOR THU SEP 24 814 (GOOD).
OUTLOOK FOR FRI SEP 25 505 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 4-10 MPH. W 4-5 MPH.
TRANSPORT WINDS S 7-12 MPH. W 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU SEP 24 POOR.
OUTLOOK FOR FRI SEP 25 GOOD.
VENTILATION INDEX (CATEGORY) 75 (POOR). 193 (POOR).
OUTLOOK FOR THU SEP 24 109 (POOR).
OUTLOOK FOR FRI SEP 25 769 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 366 (FAIR)
ELLENSBURG 352 (FAIR)
GOLDENDALE 296 (POOR)
TRI-CITIES 189 (POOR)
WALLA WALLA 233 (POOR)
YAKIMA 121 (POOR)
BEND 192 (POOR)
PRINEVILLE 176 (POOR)
ENTERPRISE 193 (POOR)
HERMISTON 251 (POOR)
JOHN DAY 309 (FAIR)
LA GRANDE 147 (POOR)
MADRAS 132 (POOR)
MEACHAM 129 (POOR)
PENDLETON 184 (POOR)
REDMOND 159 (POOR)
SENECA 682 (GOOD)
THE DALLES 319 (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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