043
AUUS46 KPDT 271325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST FRI FEB 27 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 8-15 MPH. SW 16-26 MPH.
TRANSPORT WINDS SW 8-15 MPH. SW 18-26 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT FEB 28 POOR.
OUTLOOK FOR SUN MAR 1 POOR.
VENTILATION INDEX (CATEGORY) 79 (POOR). 485 (FAIR).
OUTLOOK FOR SAT FEB 28 45 (POOR).
OUTLOOK FOR SUN MAR 1 55 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 3-6 MPH. SW 7-13 MPH.
TRANSPORT WINDS W 4-8 MPH. W 7-13 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT FEB 28 POOR.
OUTLOOK FOR SUN MAR 1 POOR.
VENTILATION INDEX (CATEGORY) 31 (POOR). 117 (POOR).
OUTLOOK FOR SAT FEB 28 38 (POOR).
OUTLOOK FOR SUN MAR 1 55 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 5-6 MPH. SW 11-15 MPH.
TRANSPORT WINDS S 5-9 MPH. W 12-16 MPH.
MIXING HEIGHT 4000 FT MSL. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT FEB 28 FAIR.
OUTLOOK FOR SUN MAR 1 POOR.
VENTILATION INDEX (CATEGORY) 78 (POOR). 450 (FAIR).
OUTLOOK FOR SAT FEB 28 169 (POOR).
OUTLOOK FOR SUN MAR 1 71 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-16 MPH. SW 15-30 MPH.
TRANSPORT WINDS SW 10-18 MPH. SW 17-29 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SAT FEB 28 POOR.
OUTLOOK FOR SUN MAR 1 POOR.
VENTILATION INDEX (CATEGORY) 103 (POOR). 577 (FAIR).
OUTLOOK FOR SAT FEB 28 55 (POOR).
OUTLOOK FOR SUN MAR 1 56 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 694 (GOOD)
ELLENSBURG 619 (GOOD)
GOLDENDALE 360 (FAIR)
TRI-CITIES 260 (POOR)
WALLA WALLA 579 (FAIR)
YAKIMA 101 (POOR)
BEND 113 (POOR)
PRINEVILLE 79 (POOR)
ENTERPRISE 384 (FAIR)
HERMISTON 467 (FAIR)
JOHN DAY 231 (POOR)
LA GRANDE 501 (FAIR)
MADRAS 83 (POOR)
MEACHAM 466 (FAIR)
PENDLETON 477 (FAIR)
REDMOND 55 (POOR)
SENECA 308 (FAIR)
THE DALLES 384 (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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