166
AUUS46 KPDT 201225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON JUL 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 1-4 MPH. N 3-6 MPH.
TRANSPORT WINDS SW 3-6 MPH. N 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR TUE JUL 21 FAIR.
OUTLOOK FOR WED JUL 22 POOR.
VENTILATION INDEX (CATEGORY) 29 (POOR). 153 (POOR).
OUTLOOK FOR TUE JUL 21 324 (FAIR).
OUTLOOK FOR WED JUL 22 335 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-4 MPH. SE 3-6 MPH.
TRANSPORT WINDS NW 4-8 MPH. SE 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR TUE JUL 21 POOR.
OUTLOOK FOR WED JUL 22 GOOD.
VENTILATION INDEX (CATEGORY) 41 (POOR). 172 (POOR).
OUTLOOK FOR TUE JUL 21 247 (POOR).
OUTLOOK FOR WED JUL 22 472 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS N 1-3 MPH. N 6-11 MPH.
TRANSPORT WINDS N 4-8 MPH. N 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE JUL 21 GOOD.
OUTLOOK FOR WED JUL 22 GOOD.
VENTILATION INDEX (CATEGORY) 35 (POOR). 259 (POOR).
OUTLOOK FOR TUE JUL 21 435 (FAIR).
OUTLOOK FOR WED JUL 22 351 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 1-4 MPH. N 3-6 MPH.
TRANSPORT WINDS SE 3-6 MPH. N 5-10 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE JUL 21 FAIR.
OUTLOOK FOR WED JUL 22 FAIR.
VENTILATION INDEX (CATEGORY) 28 (POOR). 162 (POOR).
OUTLOOK FOR TUE JUL 21 374 (FAIR).
OUTLOOK FOR WED JUL 22 379 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 485 (FAIR)
ELLENSBURG 346 (FAIR)
GOLDENDALE 177 (POOR)
TRI-CITIES 156 (POOR)
WALLA WALLA 119 (POOR)
YAKIMA 266 (POOR)
BEND 159 (POOR)
PRINEVILLE 208 (POOR)
ENTERPRISE 131 (POOR)
HERMISTON 143 (POOR)
JOHN DAY 340 (FAIR)
LA GRANDE 253 (POOR)
MADRAS 141 (POOR)
MEACHAM 198 (POOR)
PENDLETON 204 (POOR)
REDMOND 100 (POOR)
SENECA 516 (FAIR)
THE DALLES 169 (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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