950
AUUS46 KPDT 171325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED DEC 17 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 31-47 MPH. SW 24-32 MPH.
TRANSPORT WINDS W 36-48 MPH. W 29-35 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR THU DEC 18 FAIR.
OUTLOOK FOR FRI DEC 19 GOOD.
VENTILATION INDEX (CATEGORY) 292 (POOR). 972 (GOOD).
OUTLOOK FOR THU DEC 18 133 (POOR).
OUTLOOK FOR FRI DEC 19 397 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 20-30 MPH. W 19-28 MPH.
TRANSPORT WINDS W 22-32 MPH. W 23-32 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR THU DEC 18 FAIR.
OUTLOOK FOR FRI DEC 19 FAIR.
VENTILATION INDEX (CATEGORY) 207 (POOR). 863 (GOOD).
OUTLOOK FOR THU DEC 18 116 (POOR).
OUTLOOK FOR FRI DEC 19 260 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS W 18-25 MPH. W 25-31 MPH.
TRANSPORT WINDS W 27-36 MPH. W 26-30 MPH.
MIXING HEIGHT 5000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR THU DEC 18 GOOD.
OUTLOOK FOR FRI DEC 19 FAIR.
VENTILATION INDEX (CATEGORY) 675 (GOOD). 1050 (GOOD).
OUTLOOK FOR THU DEC 18 582 (FAIR).
OUTLOOK FOR FRI DEC 19 168 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 32-47 MPH. W 24-35 MPH.
TRANSPORT WINDS W 37-47 MPH. W 27-34 MPH.
MIXING HEIGHT 2500 FT MSL. 4500 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR THU DEC 18 GOOD.
OUTLOOK FOR FRI DEC 19 GOOD.
VENTILATION INDEX (CATEGORY) 472 (FAIR). 1002 (GOOD).
OUTLOOK FOR THU DEC 18 245 (POOR).
OUTLOOK FOR FRI DEC 19 392 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 866 (GOOD)
ELLENSBURG 802 (GOOD)
GOLDENDALE 678 (GOOD)
TRI-CITIES 1050 (GOOD)
WALLA WALLA 889 (GOOD)
YAKIMA 755 (GOOD)
BEND 586 (FAIR)
PRINEVILLE 669 (GOOD)
ENTERPRISE 1050 (GOOD)
HERMISTON 1050 (GOOD)
JOHN DAY 1050 (GOOD)
LA GRANDE 1050 (GOOD)
MADRAS 959 (GOOD)
MEACHAM 1050 (GOOD)
PENDLETON 1050 (GOOD)
REDMOND 627 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 666 (GOOD)
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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