436
AUUS46 KPDT 261225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON OCT 26 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 1-7 MPH. SW 7-12 MPH.
TRANSPORT WINDS SW 5-9 MPH. SW 13-17 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE OCT 27 GOOD.
OUTLOOK FOR WED OCT 28 GOOD.
VENTILATION INDEX (CATEGORY) 32 (POOR). 324 (FAIR).
OUTLOOK FOR TUE OCT 27 733 (GOOD).
OUTLOOK FOR WED OCT 28 685 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-3 MPH. SW 3-7 MPH.
TRANSPORT WINDS W 4-8 MPH. SW 7-13 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE OCT 27 FAIR.
OUTLOOK FOR WED OCT 28 FAIR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 201 (POOR).
OUTLOOK FOR TUE OCT 27 410 (FAIR).
OUTLOOK FOR WED OCT 28 462 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 5-14 MPH. SW 2-4 MPH.
TRANSPORT WINDS S 9-19 MPH. SW 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE OCT 27 FAIR.
OUTLOOK FOR WED OCT 28 FAIR.
VENTILATION INDEX (CATEGORY) 59 (POOR). 193 (POOR).
OUTLOOK FOR TUE OCT 27 171 (POOR).
OUTLOOK FOR WED OCT 28 259 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-6 MPH. SW 6-11 MPH.
TRANSPORT WINDS SW 6-9 MPH. SW 13-19 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE OCT 27 GOOD.
OUTLOOK FOR WED OCT 28 GOOD.
VENTILATION INDEX (CATEGORY) 40 (POOR). 342 (FAIR).
OUTLOOK FOR TUE OCT 27 545 (FAIR).
OUTLOOK FOR WED OCT 28 508 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 202 (POOR)
ELLENSBURG 164 (POOR)
GOLDENDALE 272 (POOR)
TRI-CITIES 308 (FAIR)
WALLA WALLA 319 (FAIR)
YAKIMA 145 (POOR)
BEND 614 (GOOD)
PRINEVILLE 515 (FAIR)
ENTERPRISE 190 (POOR)
HERMISTON 261 (POOR)
JOHN DAY 383 (FAIR)
LA GRANDE 235 (POOR)
MADRAS 607 (GOOD)
MEACHAM 255 (POOR)
PENDLETON 290 (POOR)
REDMOND 434 (FAIR)
SENECA 546 (FAIR)
THE DALLES 130 (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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