361
AUUS46 KPDT 181225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI SEP 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 S 3-11 MPH. SW 4-9 MPH.
TRANSPORT WINDS S 7-12 MPH. W 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT SEP 19 POOR.
OUTLOOK FOR SUN SEP 20 POOR.
VENTILATION INDEX (CATEGORY) 67 (POOR). 247 (POOR).
OUTLOOK FOR SAT SEP 19 167 (POOR).
OUTLOOK FOR SUN SEP 20 102 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-5 MPH. SE 1-5 MPH.
TRANSPORT WINDS NW 4-8 MPH. W 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT SEP 19 POOR.
OUTLOOK FOR SUN SEP 20 POOR.
VENTILATION INDEX (CATEGORY) 29 (POOR). 133 (POOR).
OUTLOOK FOR SAT SEP 19 160 (POOR).
OUTLOOK FOR SUN SEP 20 102 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 0-2 MPH. NW 5-9 MPH.
TRANSPORT WINDS NW 3-6 MPH. N 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT SEP 19 FAIR.
OUTLOOK FOR SUN SEP 20 FAIR.
VENTILATION INDEX (CATEGORY) 31 (POOR). 294 (POOR).
OUTLOOK FOR SAT SEP 19 351 (FAIR).
OUTLOOK FOR SUN SEP 20 181 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 4-9 MPH. W 5-6 MPH.
TRANSPORT WINDS S 8-11 MPH. W 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT SEP 19 POOR.
OUTLOOK FOR SUN SEP 20 FAIR.
VENTILATION INDEX (CATEGORY) 72 (POOR). 239 (POOR).
OUTLOOK FOR SAT SEP 19 169 (POOR).
OUTLOOK FOR SUN SEP 20 151 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 256 (POOR)
ELLENSBURG 187 (POOR)
GOLDENDALE 283 (POOR)
TRI-CITIES 168 (POOR)
WALLA WALLA 244 (POOR)
YAKIMA 135 (POOR)
BEND 332 (FAIR)
PRINEVILLE 252 (POOR)
ENTERPRISE 218 (POOR)
HERMISTON 255 (POOR)
JOHN DAY 338 (FAIR)
LA GRANDE 331 (FAIR)
MADRAS 247 (POOR)
MEACHAM 211 (POOR)
PENDLETON 330 (FAIR)
REDMOND 257 (POOR)
SENECA 491 (FAIR)
THE DALLES 410 (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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