230
AUUS46 KPDT 201124
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
424 AM PDT TUE MAY 20 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 8-16 MPH. SW 10-18 MPH.
TRANSPORT WINDS SW 10-18 MPH. W 12-20 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR WED MAY 21 FAIR.
OUTLOOK FOR THU MAY 22 FAIR.
VENTILATION INDEX (CATEGORY) 251 (POOR). 1049 (GOOD).
OUTLOOK FOR WED MAY 21 393 (FAIR).
OUTLOOK FOR THU MAY 22 340 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 5-10 MPH. W 7-14 MPH.
TRANSPORT WINDS W 5-10 MPH. W 8-16 MPH.
MIXING HEIGHT NEAR SURFACE. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 21 POOR.
OUTLOOK FOR THU MAY 22 FAIR.
VENTILATION INDEX (CATEGORY) 152 (POOR). 878 (GOOD).
OUTLOOK FOR WED MAY 21 177 (POOR).
OUTLOOK FOR THU MAY 22 258 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 3-8 MPH. NW 10-15 MPH.
TRANSPORT WINDS W 5-10 MPH. W 10-15 MPH.
MIXING HEIGHT 4000 FT MSL. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 21 GOOD.
OUTLOOK FOR THU MAY 22 FAIR.
VENTILATION INDEX (CATEGORY) 158 (POOR). 575 (FAIR).
OUTLOOK FOR WED MAY 21 276 (POOR).
OUTLOOK FOR THU MAY 22 392 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS W 8-16 MPH. SW 10-18 MPH.
TRANSPORT WINDS SW 10-20 MPH. W 12-20 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR WED MAY 21 FAIR.
OUTLOOK FOR THU MAY 22 FAIR.
VENTILATION INDEX (CATEGORY) 254 (POOR). 958 (GOOD).
OUTLOOK FOR WED MAY 21 331 (FAIR).
OUTLOOK FOR THU MAY 22 317 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 898 (GOOD)
ELLENSBURG 1050 (GOOD)
GOLDENDALE 1050 (GOOD)
TRI-CITIES 1039 (GOOD)
WALLA WALLA 1045 (GOOD)
YAKIMA 833 (GOOD)
BEND 310 (FAIR)
PRINEVILLE 546 (FAIR)
ENTERPRISE 606 (GOOD)
HERMISTON 1050 (GOOD)
JOHN DAY 587 (FAIR)
LA GRANDE 573 (FAIR)
MADRAS 594 (FAIR)
MEACHAM 656 (GOOD)
PENDLETON 1047 (GOOD)
REDMOND 523 (FAIR)
SENECA 591 (FAIR)
THE DALLES 1047 (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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