759
AUUS46 KPDT 251225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON MAY 25 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 11-18 MPH.
TRANSPORT WINDS S 5-10 MPH. W 15-23 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
OUTLOOK FOR WED MAY 27 POOR.
VENTILATION INDEX (CATEGORY) 63 (POOR). 580 (FAIR).
OUTLOOK FOR TUE MAY 26 244 (POOR).
OUTLOOK FOR WED MAY 27 137 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS SE 2-6 MPH. W 22-28 MPH.
TRANSPORT WINDS S 4-9 MPH. W 24-31 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
OUTLOOK FOR WED MAY 27 FAIR.
VENTILATION INDEX (CATEGORY) 94 (POOR). 1037 (GOOD).
OUTLOOK FOR TUE MAY 26 527 (FAIR).
OUTLOOK FOR WED MAY 27 318 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS E 0-2 MPH. SW 11-22 MPH.
TRANSPORT WINDS SW 2-4 MPH. SW 19-27 MPH.
MIXING HEIGHT NEAR SURFACE. 11500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
OUTLOOK FOR WED MAY 27 FAIR.
VENTILATION INDEX (CATEGORY) 32 (POOR). 992 (GOOD).
OUTLOOK FOR TUE MAY 26 181 (POOR).
OUTLOOK FOR WED MAY 27 390 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 2-5 MPH. NW 8-17 MPH.
TRANSPORT WINDS S 5-10 MPH. NW 10-20 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE MAY 26 POOR.
OUTLOOK FOR WED MAY 27 FAIR.
VENTILATION INDEX (CATEGORY) 50 (POOR). 382 (FAIR).
OUTLOOK FOR TUE MAY 26 152 (POOR).
OUTLOOK FOR WED MAY 27 162 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 925 (GOOD)
ELLENSBURG 1050 (GOOD)
GOLDENDALE 959 (GOOD)
TRI-CITIES 724 (GOOD)
WALLA WALLA 294 (POOR)
YAKIMA 1050 (GOOD)
BEND 1050 (GOOD)
PRINEVILLE 1050 (GOOD)
ENTERPRISE 1050 (GOOD)
HERMISTON 543 (FAIR)
JOHN DAY 1050 (GOOD)
LA GRANDE 1050 (GOOD)
MADRAS 1050 (GOOD)
MEACHAM 612 (GOOD)
PENDLETON 558 (FAIR)
REDMOND 1050 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 862 (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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