602
AUUS46 KPDT 251325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST TUE NOV 25 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SE 3-7 MPH. NW 3-5 MPH.
TRANSPORT WINDS SE 3-6 MPH. SW 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED NOV 26 POOR.
OUTLOOK FOR THU NOV 27 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 28 (POOR).
OUTLOOK FOR WED NOV 26 46 (POOR).
OUTLOOK FOR THU NOV 27 46 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS N 1-3 MPH. E 2-5 MPH.
TRANSPORT WINDS N 2-4 MPH. SE 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED NOV 26 POOR.
OUTLOOK FOR THU NOV 27 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 37 (POOR).
OUTLOOK FOR WED NOV 26 39 (POOR).
OUTLOOK FOR THU NOV 27 69 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 2-4 MPH. S 9-11 MPH.
TRANSPORT WINDS S 5-9 MPH. S 15-17 MPH.
MIXING HEIGHT 4000 FT MSL. 5500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED NOV 26 POOR.
OUTLOOK FOR THU NOV 27 GOOD.
VENTILATION INDEX (CATEGORY) 98 (POOR). 355 (FAIR).
OUTLOOK FOR WED NOV 26 242 (POOR).
OUTLOOK FOR THU NOV 27 191 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 4-8 MPH. SW 4-6 MPH.
TRANSPORT WINDS S 6-11 MPH. SW 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED NOV 26 POOR.
OUTLOOK FOR THU NOV 27 POOR.
VENTILATION INDEX (CATEGORY) 48 (POOR). 76 (POOR).
OUTLOOK FOR WED NOV 26 58 (POOR).
OUTLOOK FOR THU NOV 27 80 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 186 (POOR)
ELLENSBURG 62 (POOR)
GOLDENDALE 49 (POOR)
TRI-CITIES 25 (POOR)
WALLA WALLA 35 (POOR)
YAKIMA 41 (POOR)
BEND 159 (POOR)
PRINEVILLE 96 (POOR)
ENTERPRISE 76 (POOR)
HERMISTON 25 (POOR)
JOHN DAY 213 (POOR)
LA GRANDE 305 (FAIR)
MADRAS 88 (POOR)
MEACHAM 100 (POOR)
PENDLETON 32 (POOR)
REDMOND 109 (POOR)
SENECA 230 (POOR)
THE DALLES 53 (POOR)
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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