586
AUUS46 KPDT 241225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN MAY 24 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 7-16 MPH. SW 12-20 MPH.
TRANSPORT WINDS SW 8-16 MPH. SW 14-20 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR MON MAY 25 GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
VENTILATION INDEX (CATEGORY) 148 (POOR). 679 (GOOD).
OUTLOOK FOR MON MAY 25 544 (FAIR).
OUTLOOK FOR TUE MAY 26 463 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. SW 5-10 MPH.
TRANSPORT WINDS W 3-6 MPH. SW 11-15 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON MAY 25 GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
VENTILATION INDEX (CATEGORY) 49 (POOR). 519 (FAIR).
OUTLOOK FOR MON MAY 25 1027 (GOOD).
OUTLOOK FOR TUE MAY 26 490 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 0-2 MPH. NW 4-7 MPH.
TRANSPORT WINDS SW 3-6 MPH. SW 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON MAY 25 GOOD.
OUTLOOK FOR TUE MAY 26 FAIR.
VENTILATION INDEX (CATEGORY) 53 (POOR). 388 (FAIR).
OUTLOOK FOR MON MAY 25 933 (GOOD).
OUTLOOK FOR TUE MAY 26 287 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 6-16 MPH. W 9-16 MPH.
TRANSPORT WINDS S 8-15 MPH. SW 10-17 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON MAY 25 FAIR.
OUTLOOK FOR TUE MAY 26 FAIR.
VENTILATION INDEX (CATEGORY) 133 (POOR). 491 (FAIR).
OUTLOOK FOR MON MAY 25 398 (FAIR).
OUTLOOK FOR TUE MAY 26 293 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 439 (FAIR)
ELLENSBURG 629 (GOOD)
GOLDENDALE 676 (GOOD)
TRI-CITIES 650 (GOOD)
WALLA WALLA 480 (FAIR)
YAKIMA 485 (FAIR)
BEND 819 (GOOD)
PRINEVILLE 581 (FAIR)
ENTERPRISE 439 (FAIR)
HERMISTON 665 (GOOD)
JOHN DAY 792 (GOOD)
LA GRANDE 468 (FAIR)
MADRAS 614 (GOOD)
MEACHAM 421 (FAIR)
PENDLETON 536 (FAIR)
REDMOND 620 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 564 (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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