763
AUUS46 KPDT 051225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE MAY 5 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 4-9 MPH. N 12-17 MPH.
TRANSPORT WINDS SW 5-10 MPH. N 14-17 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 6 GOOD.
OUTLOOK FOR THU MAY 7 FAIR.
VENTILATION INDEX (CATEGORY) 69 (POOR). 738 (GOOD).
OUTLOOK FOR WED MAY 6 493 (FAIR).
OUTLOOK FOR THU MAY 7 680 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 4-8 MPH. E 7-10 MPH.
TRANSPORT WINDS N 7-12 MPH. N 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 6 GOOD.
OUTLOOK FOR THU MAY 7 FAIR.
VENTILATION INDEX (CATEGORY) 127 (POOR). 570 (FAIR).
OUTLOOK FOR WED MAY 6 414 (FAIR).
OUTLOOK FOR THU MAY 7 366 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 4-9 MPH. N 16-26 MPH.
TRANSPORT WINDS NW 5-10 MPH. N 17-24 MPH.
MIXING HEIGHT 4000 FT MSL. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 6 GOOD.
OUTLOOK FOR THU MAY 7 GOOD.
VENTILATION INDEX (CATEGORY) 180 (POOR). 1040 (GOOD).
OUTLOOK FOR WED MAY 6 439 (FAIR).
OUTLOOK FOR THU MAY 7 828 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 3-7 MPH. N 12-17 MPH.
TRANSPORT WINDS S 5-9 MPH. N 15-18 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 6 GOOD.
OUTLOOK FOR THU MAY 7 FAIR.
VENTILATION INDEX (CATEGORY) 68 (POOR). 697 (GOOD).
OUTLOOK FOR WED MAY 6 565 (FAIR).
OUTLOOK FOR THU MAY 7 711 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 293 (POOR)
ELLENSBURG 347 (FAIR)
GOLDENDALE 431 (FAIR)
TRI-CITIES 777 (GOOD)
WALLA WALLA 583 (FAIR)
YAKIMA 510 (FAIR)
BEND 866 (GOOD)
PRINEVILLE 978 (GOOD)
ENTERPRISE 1050 (GOOD)
HERMISTON 722 (GOOD)
JOHN DAY 1050 (GOOD)
LA GRANDE 1019 (GOOD)
MADRAS 682 (GOOD)
MEACHAM 691 (GOOD)
PENDLETON 829 (GOOD)
REDMOND 900 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 303 (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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