309
AUUS46 KPDT 281325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED JAN 28 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 3-7 MPH. SW 4-8 MPH.
TRANSPORT WINDS S 4-8 MPH. SW 7-13 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU JAN 29 POOR.
OUTLOOK FOR FRI JAN 30 POOR.
VENTILATION INDEX (CATEGORY) 30 (POOR). 92 (POOR).
OUTLOOK FOR THU JAN 29 49 (POOR).
OUTLOOK FOR FRI JAN 30 37 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS E 1-3 MPH. S 2-5 MPH.
TRANSPORT WINDS SE 3-8 MPH. SW 3-10 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU JAN 29 POOR.
OUTLOOK FOR FRI JAN 30 POOR.
VENTILATION INDEX (CATEGORY) 32 (POOR). 51 (POOR).
OUTLOOK FOR THU JAN 29 47 (POOR).
OUTLOOK FOR FRI JAN 30 27 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 5-9 MPH. S 5-6 MPH.
TRANSPORT WINDS S 8-11 MPH. W 7-10 MPH.
MIXING HEIGHT 4000 FT MSL. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU JAN 29 FAIR.
OUTLOOK FOR FRI JAN 30 GOOD.
VENTILATION INDEX (CATEGORY) 85 (POOR). 206 (POOR).
OUTLOOK FOR THU JAN 29 234 (POOR).
OUTLOOK FOR FRI JAN 30 363 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 3-7 MPH. SW 4-12 MPH.
TRANSPORT WINDS S 7-13 MPH. SW 8-18 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU JAN 29 FAIR.
OUTLOOK FOR FRI JAN 30 POOR.
VENTILATION INDEX (CATEGORY) 59 (POOR). 206 (POOR).
OUTLOOK FOR THU JAN 29 113 (POOR).
OUTLOOK FOR FRI JAN 30 80 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 74 (POOR)
ELLENSBURG 32 (POOR)
GOLDENDALE 56 (POOR)
TRI-CITIES 105 (POOR)
WALLA WALLA 91 (POOR)
YAKIMA 28 (POOR)
BEND 289 (POOR)
PRINEVILLE 347 (FAIR)
ENTERPRISE 292 (POOR)
HERMISTON 38 (POOR)
JOHN DAY 302 (FAIR)
LA GRANDE 272 (POOR)
MADRAS 228 (POOR)
MEACHAM 315 (FAIR)
PENDLETON 116 (POOR)
REDMOND 247 (POOR)
SENECA 367 (FAIR)
THE DALLES 41 (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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