408
AUUS46 KPDT 181325
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST TUE NOV 18 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 7-16 MPH. SW 7-10 MPH.
TRANSPORT WINDS SW 10-16 MPH. W 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY FAIR. POOR.
OUTLOOK FOR WED NOV 19 POOR.
OUTLOOK FOR THU NOV 20 POOR.
VENTILATION INDEX (CATEGORY) 68 (POOR). 223 (POOR).
OUTLOOK FOR WED NOV 19 61 (POOR).
OUTLOOK FOR THU NOV 20 66 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 3-7 MPH. W 2-5 MPH.
TRANSPORT WINDS W 4-8 MPH. NW 2-5 MPH.
MIXING HEIGHT NEAR SURFACE. 3000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED NOV 19 POOR.
OUTLOOK FOR THU NOV 20 POOR.
VENTILATION INDEX (CATEGORY) 31 (POOR). 61 (POOR).
OUTLOOK FOR WED NOV 19 82 (POOR).
OUTLOOK FOR THU NOV 20 57 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS W 2-4 MPH. NW 4-5 MPH.
TRANSPORT WINDS W 5-9 MPH. NW 6-8 MPH.
MIXING HEIGHT 4500 FT MSL. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED NOV 19 FAIR.
OUTLOOK FOR THU NOV 20 FAIR.
VENTILATION INDEX (CATEGORY) 76 (POOR). 162 (POOR).
OUTLOOK FOR WED NOV 19 75 (POOR).
OUTLOOK FOR THU NOV 20 187 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 4-16 MPH. W 5-11 MPH.
TRANSPORT WINDS SW 10-19 MPH. W 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY FAIR. POOR.
OUTLOOK FOR WED NOV 19 POOR.
OUTLOOK FOR THU NOV 20 POOR.
VENTILATION INDEX (CATEGORY) 98 (POOR). 247 (POOR).
OUTLOOK FOR WED NOV 19 62 (POOR).
OUTLOOK FOR THU NOV 20 79 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 441 (FAIR)
ELLENSBURG 381 (FAIR)
GOLDENDALE 181 (POOR)
TRI-CITIES 122 (POOR)
WALLA WALLA 270 (POOR)
YAKIMA 65 (POOR)
BEND 117 (POOR)
PRINEVILLE 99 (POOR)
ENTERPRISE 128 (POOR)
HERMISTON 260 (POOR)
JOHN DAY 150 (POOR)
LA GRANDE 211 (POOR)
MADRAS 128 (POOR)
MEACHAM 138 (POOR)
PENDLETON 287 (POOR)
REDMOND 112 (POOR)
SENECA 121 (POOR)
THE DALLES 330 (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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