514
AUUS46 KPDT 291225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE SEP 29 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 6-18 MPH. SW 16-22 MPH.
TRANSPORT WINDS SW 10-20 MPH. SW 20-25 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR WED SEP 30 POOR.
OUTLOOK FOR THU OCT 1 FAIR.
VENTILATION INDEX (CATEGORY) 125 (POOR). 700 (GOOD).
OUTLOOK FOR WED SEP 30 240 (POOR).
OUTLOOK FOR THU OCT 1 149 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS SE 0-9 MPH. W 9-16 MPH.
TRANSPORT WINDS SW 3-11 MPH. W 14-19 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED SEP 30 POOR.
OUTLOOK FOR THU OCT 1 POOR.
VENTILATION INDEX (CATEGORY) 37 (POOR). 457 (FAIR).
OUTLOOK FOR WED SEP 30 122 (POOR).
OUTLOOK FOR THU OCT 1 105 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 2-5 MPH. NW 4-9 MPH.
TRANSPORT WINDS S 4-7 MPH. W 11-15 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED SEP 30 FAIR.
OUTLOOK FOR THU OCT 1 FAIR.
VENTILATION INDEX (CATEGORY) 34 (POOR). 435 (FAIR).
OUTLOOK FOR WED SEP 30 342 (FAIR).
OUTLOOK FOR THU OCT 1 162 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-14 MPH. W 14-21 MPH.
TRANSPORT WINDS S 10-19 MPH. W 18-25 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR WED SEP 30 FAIR.
OUTLOOK FOR THU OCT 1 FAIR.
VENTILATION INDEX (CATEGORY) 123 (POOR). 696 (GOOD).
OUTLOOK FOR WED SEP 30 315 (FAIR).
OUTLOOK FOR THU OCT 1 168 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 443 (FAIR)
ELLENSBURG 341 (FAIR)
GOLDENDALE 571 (FAIR)
TRI-CITIES 573 (FAIR)
WALLA WALLA 801 (GOOD)
YAKIMA 378 (FAIR)
BEND 222 (POOR)
PRINEVILLE 312 (FAIR)
ENTERPRISE 447 (FAIR)
HERMISTON 779 (GOOD)
JOHN DAY 312 (FAIR)
LA GRANDE 517 (FAIR)
MADRAS 304 (FAIR)
MEACHAM 510 (FAIR)
PENDLETON 716 (GOOD)
REDMOND 314 (FAIR)
SENECA 380 (FAIR)
THE DALLES 484 (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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