818
AUUS46 KPDT 081225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED OCT 8 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 4-12 MPH. W 7-10 MPH.
TRANSPORT WINDS S 6-12 MPH. W 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU OCT 9 POOR.
OUTLOOK FOR FRI OCT 10 FAIR.
VENTILATION INDEX (CATEGORY) 41 (POOR). 187 (POOR).
OUTLOOK FOR THU OCT 9 113 (POOR).
OUTLOOK FOR FRI OCT 10 379 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. S 5-9 MPH.
TRANSPORT WINDS W 3-7 MPH. SW 11-16 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU OCT 9 POOR.
OUTLOOK FOR FRI OCT 10 GOOD.
VENTILATION INDEX (CATEGORY) 33 (POOR). 376 (FAIR).
OUTLOOK FOR THU OCT 9 87 (POOR).
OUTLOOK FOR FRI OCT 10 478 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 10-18 MPH. S 16-20 MPH.
TRANSPORT WINDS S 11-18 MPH. S 22-25 MPH.
MIXING HEIGHT 4000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR THU OCT 9 GOOD.
OUTLOOK FOR FRI OCT 10 GOOD.
VENTILATION INDEX (CATEGORY) 204 (POOR). 896 (GOOD).
OUTLOOK FOR THU OCT 9 720 (GOOD).
OUTLOOK FOR FRI OCT 10 1044 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 8-15 MPH. NW 6-8 MPH.
TRANSPORT WINDS S 10-16 MPH. W 6-9 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR THU OCT 9 POOR.
OUTLOOK FOR FRI OCT 10 FAIR.
VENTILATION INDEX (CATEGORY) 81 (POOR). 205 (POOR).
OUTLOOK FOR THU OCT 9 82 (POOR).
OUTLOOK FOR FRI OCT 10 291 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 286 (POOR)
ELLENSBURG 259 (POOR)
GOLDENDALE 433 (FAIR)
TRI-CITIES 272 (POOR)
WALLA WALLA 178 (POOR)
YAKIMA 348 (FAIR)
BEND 1050 (GOOD)
PRINEVILLE 1050 (GOOD)
ENTERPRISE 1050 (GOOD)
HERMISTON 194 (POOR)
JOHN DAY 1050 (GOOD)
LA GRANDE 783 (GOOD)
MADRAS 749 (GOOD)
MEACHAM 549 (FAIR)
PENDLETON 191 (POOR)
REDMOND 1050 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 467 (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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