635
AUUS46 KPDT 201325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST FRI FEB 20 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS W 3-6 MPH. SW 6-11 MPH.
TRANSPORT WINDS W 3-7 MPH. SW 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT FEB 21 POOR.
OUTLOOK FOR SUN FEB 22 FAIR.
VENTILATION INDEX (CATEGORY) 36 (POOR). 383 (FAIR).
OUTLOOK FOR SAT FEB 21 82 (POOR).
OUTLOOK FOR SUN FEB 22 106 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NE 2-3 MPH. SE 3-6 MPH.
TRANSPORT WINDS W 2-4 MPH. SW 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT FEB 21 POOR.
OUTLOOK FOR SUN FEB 22 POOR.
VENTILATION INDEX (CATEGORY) 27 (POOR). 106 (POOR).
OUTLOOK FOR SAT FEB 21 70 (POOR).
OUTLOOK FOR SUN FEB 22 42 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 2-4 MPH. S 6-8 MPH.
TRANSPORT WINDS SW 5-9 MPH. SW 7-10 MPH.
MIXING HEIGHT 4000 FT MSL. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT FEB 21 GOOD.
OUTLOOK FOR SUN FEB 22 GOOD.
VENTILATION INDEX (CATEGORY) 103 (POOR). 283 (POOR).
OUTLOOK FOR SAT FEB 21 900 (GOOD).
OUTLOOK FOR SUN FEB 22 970 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 3-7 MPH. SW 5-13 MPH.
TRANSPORT WINDS W 6-12 MPH. SW 9-16 MPH.
MIXING HEIGHT 2000 FT MSL. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT FEB 21 FAIR.
OUTLOOK FOR SUN FEB 22 GOOD.
VENTILATION INDEX (CATEGORY) 100 (POOR). 420 (FAIR).
OUTLOOK FOR SAT FEB 21 260 (POOR).
OUTLOOK FOR SUN FEB 22 441 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 237 (POOR)
ELLENSBURG 112 (POOR)
GOLDENDALE 355 (FAIR)
TRI-CITIES 198 (POOR)
WALLA WALLA 417 (FAIR)
YAKIMA 85 (POOR)
BEND 275 (POOR)
PRINEVILLE 273 (POOR)
ENTERPRISE 234 (POOR)
HERMISTON 419 (FAIR)
JOHN DAY 233 (POOR)
LA GRANDE 294 (POOR)
MADRAS 315 (FAIR)
MEACHAM 317 (FAIR)
PENDLETON 434 (FAIR)
REDMOND 227 (POOR)
SENECA 290 (POOR)
THE DALLES 185 (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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