618
AUUS46 KPDT 191225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE MAY 19 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 7-14 MPH. W 9-16 MPH.
TRANSPORT WINDS SW 7-14 MPH. W 11-16 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 20 FAIR.
OUTLOOK FOR THU MAY 21 FAIR.
VENTILATION INDEX (CATEGORY) 164 (POOR). 733 (GOOD).
OUTLOOK FOR WED MAY 20 391 (FAIR).
OUTLOOK FOR THU MAY 21 396 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 3-7 MPH. NW 4-8 MPH.
TRANSPORT WINDS W 4-7 MPH. W 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 20 FAIR.
OUTLOOK FOR THU MAY 21 FAIR.
VENTILATION INDEX (CATEGORY) 78 (POOR). 435 (FAIR).
OUTLOOK FOR WED MAY 20 339 (FAIR).
OUTLOOK FOR THU MAY 21 283 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 0-2 MPH. NW 4-5 MPH.
TRANSPORT WINDS SW 3-7 MPH. W 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 20 GOOD.
OUTLOOK FOR THU MAY 21 GOOD.
VENTILATION INDEX (CATEGORY) 68 (POOR). 481 (FAIR).
OUTLOOK FOR WED MAY 20 524 (FAIR).
OUTLOOK FOR THU MAY 21 724 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-13 MPH. W 8-13 MPH.
TRANSPORT WINDS S 8-14 MPH. W 11-15 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 20 FAIR.
OUTLOOK FOR THU MAY 21 FAIR.
VENTILATION INDEX (CATEGORY) 144 (POOR). 619 (GOOD).
OUTLOOK FOR WED MAY 20 366 (FAIR).
OUTLOOK FOR THU MAY 21 397 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 608 (GOOD)
ELLENSBURG 1050 (GOOD)
GOLDENDALE 719 (GOOD)
TRI-CITIES 629 (GOOD)
WALLA WALLA 548 (FAIR)
YAKIMA 461 (FAIR)
BEND 581 (FAIR)
PRINEVILLE 533 (FAIR)
ENTERPRISE 417 (FAIR)
HERMISTON 670 (GOOD)
JOHN DAY 578 (FAIR)
LA GRANDE 555 (FAIR)
MADRAS 509 (FAIR)
MEACHAM 526 (FAIR)
PENDLETON 676 (GOOD)
REDMOND 549 (FAIR)
SENECA 704 (GOOD)
THE DALLES 865 (GOOD)
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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