172
AUUS46 KPDT 121225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE MAY 12 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS NE 2-6 MPH. N 6-11 MPH.
TRANSPORT WINDS NE 3-7 MPH. NE 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 13 GOOD.
OUTLOOK FOR THU MAY 14 GOOD.
VENTILATION INDEX (CATEGORY) 33 (POOR). 221 (POOR).
OUTLOOK FOR WED MAY 13 1012 (GOOD).
OUTLOOK FOR THU MAY 14 875 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. E 3-6 MPH.
TRANSPORT WINDS NW 4-8 MPH. E 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED MAY 13 GOOD.
OUTLOOK FOR THU MAY 14 FAIR.
VENTILATION INDEX (CATEGORY) 53 (POOR). 251 (POOR).
OUTLOOK FOR WED MAY 13 940 (GOOD).
OUTLOOK FOR THU MAY 14 581 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NE 1-3 MPH. SE 11-19 MPH.
TRANSPORT WINDS E 2-5 MPH. S 17-20 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR WED MAY 13 GOOD.
OUTLOOK FOR THU MAY 14 GOOD.
VENTILATION INDEX (CATEGORY) 30 (POOR). 606 (GOOD).
OUTLOOK FOR WED MAY 13 624 (GOOD).
OUTLOOK FOR THU MAY 14 576 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 2-5 MPH. N 6-11 MPH.
TRANSPORT WINDS SE 5-10 MPH. NE 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 13 GOOD.
OUTLOOK FOR THU MAY 14 GOOD.
VENTILATION INDEX (CATEGORY) 32 (POOR). 175 (POOR).
OUTLOOK FOR WED MAY 13 896 (GOOD).
OUTLOOK FOR THU MAY 14 812 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 434 (FAIR)
ELLENSBURG 398 (FAIR)
GOLDENDALE 332 (FAIR)
TRI-CITIES 242 (POOR)
WALLA WALLA 132 (POOR)
YAKIMA 277 (POOR)
BEND 1050 (GOOD)
PRINEVILLE 838 (GOOD)
ENTERPRISE 654 (GOOD)
HERMISTON 234 (POOR)
JOHN DAY 1050 (GOOD)
LA GRANDE 626 (GOOD)
MADRAS 77 (POOR)
MEACHAM 461 (FAIR)
PENDLETON 234 (POOR)
REDMOND 558 (FAIR)
SENECA 1050 (GOOD)
THE DALLES 301 (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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page