074
AUUS46 KPDT 221225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI MAY 22 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SE 3-6 MPH. N 5-6 MPH.
TRANSPORT WINDS SE 4-8 MPH. N 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT MAY 23 GOOD.
OUTLOOK FOR SUN MAY 24 FAIR.
VENTILATION INDEX (CATEGORY) 40 (POOR). 277 (POOR).
OUTLOOK FOR SAT MAY 23 757 (GOOD).
OUTLOOK FOR SUN MAY 24 665 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 1-3 MPH. SE 3-6 MPH.
TRANSPORT WINDS NW 3-6 MPH. SW 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT MAY 23 FAIR.
OUTLOOK FOR SUN MAY 24 FAIR.
VENTILATION INDEX (CATEGORY) 36 (POOR). 373 (FAIR).
OUTLOOK FOR SAT MAY 23 513 (FAIR).
OUTLOOK FOR SUN MAY 24 439 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 0-2 MPH. N 4-8 MPH.
TRANSPORT WINDS N 3-6 MPH. NW 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT MAY 23 GOOD.
OUTLOOK FOR SUN MAY 24 GOOD.
VENTILATION INDEX (CATEGORY) 51 (POOR). 290 (POOR).
OUTLOOK FOR SAT MAY 23 536 (FAIR).
OUTLOOK FOR SUN MAY 24 510 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 3-7 MPH. N 4-8 MPH.
TRANSPORT WINDS SE 6-8 MPH. N 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT MAY 23 GOOD.
OUTLOOK FOR SUN MAY 24 FAIR.
VENTILATION INDEX (CATEGORY) 47 (POOR). 303 (FAIR).
OUTLOOK FOR SAT MAY 23 611 (GOOD).
OUTLOOK FOR SUN MAY 24 605 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 473 (FAIR)
ELLENSBURG 395 (FAIR)
GOLDENDALE 499 (FAIR)
TRI-CITIES 159 (POOR)
WALLA WALLA 187 (POOR)
YAKIMA 416 (FAIR)
BEND 484 (FAIR)
PRINEVILLE 391 (FAIR)
ENTERPRISE 326 (FAIR)
HERMISTON 209 (POOR)
JOHN DAY 443 (FAIR)
LA GRANDE 284 (POOR)
MADRAS 346 (FAIR)
MEACHAM 300 (POOR)
PENDLETON 302 (FAIR)
REDMOND 399 (FAIR)
SENECA 571 (FAIR)
THE DALLES 435 (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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