812
AUUS46 KPDT 181225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON MAY 18 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 5-11 MPH. NW 5-9 MPH.
TRANSPORT WINDS SW 6-11 MPH. NW 6-10 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE MAY 19 GOOD.
OUTLOOK FOR WED MAY 20 FAIR.
VENTILATION INDEX (CATEGORY) 117 (POOR). 504 (FAIR).
OUTLOOK FOR TUE MAY 19 668 (GOOD).
OUTLOOK FOR WED MAY 20 348 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 3-6 MPH. W 3-6 MPH.
TRANSPORT WINDS NW 5-9 MPH. NW 5-6 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR TUE MAY 19 FAIR.
OUTLOOK FOR WED MAY 20 FAIR.
VENTILATION INDEX (CATEGORY) 85 (POOR). 395 (FAIR).
OUTLOOK FOR TUE MAY 19 402 (FAIR).
OUTLOOK FOR WED MAY 20 323 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 0-2 MPH. N 8-13 MPH.
TRANSPORT WINDS NW 4-8 MPH. N 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR TUE MAY 19 GOOD.
OUTLOOK FOR WED MAY 20 GOOD.
VENTILATION INDEX (CATEGORY) 109 (POOR). 647 (GOOD).
OUTLOOK FOR TUE MAY 19 565 (FAIR).
OUTLOOK FOR WED MAY 20 410 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-11 MPH. NW 6-8 MPH.
TRANSPORT WINDS S 8-11 MPH. NW 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE MAY 19 GOOD.
OUTLOOK FOR WED MAY 20 FAIR.
VENTILATION INDEX (CATEGORY) 111 (POOR). 449 (FAIR).
OUTLOOK FOR TUE MAY 19 626 (GOOD).
OUTLOOK FOR WED MAY 20 319 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 576 (FAIR)
ELLENSBURG 904 (GOOD)
GOLDENDALE 672 (GOOD)
TRI-CITIES 386 (FAIR)
WALLA WALLA 318 (FAIR)
YAKIMA 363 (FAIR)
BEND 772 (GOOD)
PRINEVILLE 754 (GOOD)
ENTERPRISE 451 (FAIR)
HERMISTON 444 (FAIR)
JOHN DAY 962 (GOOD)
LA GRANDE 668 (GOOD)
MADRAS 628 (GOOD)
MEACHAM 490 (FAIR)
PENDLETON 494 (FAIR)
REDMOND 700 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 739 (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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