143
AUUS46 KPDT 201225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE OCT 20 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SE 0-3 MPH. N 2-6 MPH.
TRANSPORT WINDS NE 2-5 MPH. N 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED OCT 21 POOR.
OUTLOOK FOR THU OCT 22 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 84 (POOR).
OUTLOOK FOR WED OCT 21 64 (POOR).
OUTLOOK FOR THU OCT 22 53 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-3 MPH. NE 2-5 MPH.
TRANSPORT WINDS NW 4-8 MPH. NE 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED OCT 21 POOR.
OUTLOOK FOR THU OCT 22 POOR.
VENTILATION INDEX (CATEGORY) 28 (POOR). 158 (POOR).
OUTLOOK FOR WED OCT 21 62 (POOR).
OUTLOOK FOR THU OCT 22 51 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NE 0-2 MPH. N 1-4 MPH.
TRANSPORT WINDS N 4-8 MPH. S 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED OCT 21 FAIR.
OUTLOOK FOR THU OCT 22 FAIR.
VENTILATION INDEX (CATEGORY) 26 (POOR). 102 (POOR).
OUTLOOK FOR WED OCT 21 311 (FAIR).
OUTLOOK FOR THU OCT 22 120 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 0-3 MPH. N 2-4 MPH.
TRANSPORT WINDS SE 3-6 MPH. N 4-5 MPH.
MIXING HEIGHT NEAR SURFACE. 2500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED OCT 21 POOR.
OUTLOOK FOR THU OCT 22 POOR.
VENTILATION INDEX (CATEGORY) 25 (POOR). 59 (POOR).
OUTLOOK FOR WED OCT 21 56 (POOR).
OUTLOOK FOR THU OCT 22 46 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 215 (POOR)
ELLENSBURG 107 (POOR)
GOLDENDALE 227 (POOR)
TRI-CITIES 103 (POOR)
WALLA WALLA 42 (POOR)
YAKIMA 203 (POOR)
BEND 94 (POOR)
PRINEVILLE 25 (POOR)
ENTERPRISE 32 (POOR)
HERMISTON 98 (POOR)
JOHN DAY 146 (POOR)
LA GRANDE 116 (POOR)
MADRAS 104 (POOR)
MEACHAM 55 (POOR)
PENDLETON 80 (POOR)
REDMOND 68 (POOR)
SENECA 280 (POOR)
THE DALLES 246 (POOR)
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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