901
AUUS46 KPDT 211325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SAT FEB 21 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS N 2-8 MPH. N 5-13 MPH.
TRANSPORT WINDS NE 5-11 MPH. NE 7-14 MPH.
MIXING HEIGHT NEAR SURFACE. 2000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SUN FEB 22 FAIR.
OUTLOOK FOR MON FEB 23 POOR.
VENTILATION INDEX (CATEGORY) 32 (POOR). 82 (POOR).
OUTLOOK FOR SUN FEB 22 121 (POOR).
OUTLOOK FOR MON FEB 23 115 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. N 4-8 MPH.
TRANSPORT WINDS N 5-10 MPH. NE 5-10 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SUN FEB 22 POOR.
OUTLOOK FOR MON FEB 23 POOR.
VENTILATION INDEX (CATEGORY) 45 (POOR). 93 (POOR).
OUTLOOK FOR SUN FEB 22 34 (POOR).
OUTLOOK FOR MON FEB 23 111 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 10-22 MPH. S 19-31 MPH.
TRANSPORT WINDS S 12-21 MPH. S 25-32 MPH.
MIXING HEIGHT 4000 FT MSL. 6000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR SUN FEB 22 GOOD.
OUTLOOK FOR MON FEB 23 GOOD.
VENTILATION INDEX (CATEGORY) 184 (POOR). 679 (GOOD).
OUTLOOK FOR SUN FEB 22 858 (GOOD).
OUTLOOK FOR MON FEB 23 422 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 4-12 MPH. SE 4-16 MPH.
TRANSPORT WINDS SE 10-21 MPH. S 9-20 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR SUN FEB 22 GOOD.
OUTLOOK FOR MON FEB 23 FAIR.
VENTILATION INDEX (CATEGORY) 79 (POOR). 204 (POOR).
OUTLOOK FOR SUN FEB 22 359 (FAIR).
OUTLOOK FOR MON FEB 23 268 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 339 (FAIR)
ELLENSBURG 141 (POOR)
GOLDENDALE 162 (POOR)
TRI-CITIES 92 (POOR)
WALLA WALLA 113 (POOR)
YAKIMA 94 (POOR)
BEND 526 (FAIR)
PRINEVILLE 644 (GOOD)
ENTERPRISE 148 (POOR)
HERMISTON 97 (POOR)
JOHN DAY 440 (FAIR)
LA GRANDE 680 (GOOD)
MADRAS 433 (FAIR)
MEACHAM 278 (POOR)
PENDLETON 58 (POOR)
REDMOND 605 (GOOD)
SENECA 512 (FAIR)
THE DALLES 235 (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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