405
AUUS46 KPDT 121325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED NOV 12 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS N 1-4 MPH. N 3-6 MPH.
TRANSPORT WINDS N 3-7 MPH. N 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. NEAR SURFACE.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU NOV 13 POOR.
OUTLOOK FOR FRI NOV 14 GOOD.
VENTILATION INDEX (CATEGORY) 26 (POOR). 46 (POOR).
OUTLOOK FOR THU NOV 13 58 (POOR).
OUTLOOK FOR FRI NOV 14 561 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-4 MPH. SE 2-5 MPH.
TRANSPORT WINDS N 2-4 MPH. SE 2-4 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU NOV 13 POOR.
OUTLOOK FOR FRI NOV 14 GOOD.
VENTILATION INDEX (CATEGORY) 26 (POOR). 38 (POOR).
OUTLOOK FOR THU NOV 13 35 (POOR).
OUTLOOK FOR FRI NOV 14 458 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 7-12 MPH. S 11-14 MPH.
TRANSPORT WINDS S 10-14 MPH. S 17-20 MPH.
MIXING HEIGHT 4000 FT MSL. 5500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR THU NOV 13 GOOD.
OUTLOOK FOR FRI NOV 14 FAIR.
VENTILATION INDEX (CATEGORY) 126 (POOR). 405 (FAIR).
OUTLOOK FOR THU NOV 13 670 (GOOD).
OUTLOOK FOR FRI NOV 14 418 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 2-5 MPH. N 4-5 MPH.
TRANSPORT WINDS SE 4-9 MPH. W 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU NOV 13 FAIR.
OUTLOOK FOR FRI NOV 14 GOOD.
VENTILATION INDEX (CATEGORY) 33 (POOR). 42 (POOR).
OUTLOOK FOR THU NOV 13 249 (POOR).
OUTLOOK FOR FRI NOV 14 584 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 121 (POOR)
ELLENSBURG 56 (POOR)
GOLDENDALE 51 (POOR)
TRI-CITIES 54 (POOR)
WALLA WALLA 32 (POOR)
YAKIMA 39 (POOR)
BEND 436 (FAIR)
PRINEVILLE 339 (FAIR)
ENTERPRISE 174 (POOR)
HERMISTON 43 (POOR)
JOHN DAY 503 (FAIR)
LA GRANDE 338 (FAIR)
MADRAS 201 (POOR)
MEACHAM 148 (POOR)
PENDLETON 45 (POOR)
REDMOND 358 (FAIR)
SENECA 557 (FAIR)
THE DALLES 64 (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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