746
AUUS46 KPDT 211225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU MAY 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 3-7 MPH. N 6-11 MPH.
TRANSPORT WINDS N 5-10 MPH. NE 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI MAY 22 FAIR.
OUTLOOK FOR SAT MAY 23 GOOD.
VENTILATION INDEX (CATEGORY) 89 (POOR). 559 (FAIR).
OUTLOOK FOR FRI MAY 22 394 (FAIR).
OUTLOOK FOR SAT MAY 23 558 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-7 MPH. E 3-6 MPH.
TRANSPORT WINDS N 6-10 MPH. NE 6-9 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI MAY 22 POOR.
OUTLOOK FOR SAT MAY 23 FAIR.
VENTILATION INDEX (CATEGORY) 120 (POOR). 450 (FAIR).
OUTLOOK FOR FRI MAY 22 248 (POOR).
OUTLOOK FOR SAT MAY 23 437 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 1-3 MPH. N 7-13 MPH.
TRANSPORT WINDS N 5-7 MPH. N 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI MAY 22 GOOD.
OUTLOOK FOR SAT MAY 23 GOOD.
VENTILATION INDEX (CATEGORY) 121 (POOR). 648 (GOOD).
OUTLOOK FOR FRI MAY 22 397 (FAIR).
OUTLOOK FOR SAT MAY 23 498 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-5 MPH. N 7-10 MPH.
TRANSPORT WINDS SW 4-8 MPH. N 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI MAY 22 FAIR.
OUTLOOK FOR SAT MAY 23 GOOD.
VENTILATION INDEX (CATEGORY) 67 (POOR). 442 (FAIR).
OUTLOOK FOR FRI MAY 22 384 (FAIR).
OUTLOOK FOR SAT MAY 23 502 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 59 (POOR)
ELLENSBURG 92 (POOR)
GOLDENDALE 578 (FAIR)
TRI-CITIES 643 (GOOD)
WALLA WALLA 409 (FAIR)
YAKIMA 335 (FAIR)
BEND 513 (FAIR)
PRINEVILLE 666 (GOOD)
ENTERPRISE 536 (FAIR)
HERMISTON 585 (FAIR)
JOHN DAY 697 (GOOD)
LA GRANDE 600 (FAIR)
MADRAS 688 (GOOD)
MEACHAM 384 (FAIR)
PENDLETON 528 (FAIR)
REDMOND 677 (GOOD)
SENECA 696 (GOOD)
THE DALLES 578 (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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