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AUUS46 KPDT 291225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUL 29 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 4-10 MPH. NW 4-8 MPH.
TRANSPORT WINDS SW 5-10 MPH. W 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU JUL 30 FAIR.
OUTLOOK FOR FRI JUL 31 FAIR.
VENTILATION INDEX (CATEGORY) 76 (POOR). 229 (POOR).
OUTLOOK FOR THU JUL 30 501 (FAIR).
OUTLOOK FOR FRI JUL 31 270 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 2-5 MPH. SE 2-6 MPH.
TRANSPORT WINDS NW 4-8 MPH. SW 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU JUL 30 FAIR.
OUTLOOK FOR FRI JUL 31 FAIR.
VENTILATION INDEX (CATEGORY) 52 (POOR). 219 (POOR).
OUTLOOK FOR THU JUL 30 339 (FAIR).
OUTLOOK FOR FRI JUL 31 186 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 2-6 MPH. NW 7-9 MPH.
TRANSPORT WINDS NW 4-8 MPH. NW 9-11 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU JUL 30 GOOD.
OUTLOOK FOR FRI JUL 31 FAIR.
VENTILATION INDEX (CATEGORY) 52 (POOR). 289 (POOR).
OUTLOOK FOR THU JUL 30 368 (FAIR).
OUTLOOK FOR FRI JUL 31 140 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 2-9 MPH. NW 5-9 MPH.
TRANSPORT WINDS SW 5-9 MPH. NW 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU JUL 30 FAIR.
OUTLOOK FOR FRI JUL 31 FAIR.
VENTILATION INDEX (CATEGORY) 71 (POOR). 233 (POOR).
OUTLOOK FOR THU JUL 30 394 (FAIR).
OUTLOOK FOR FRI JUL 31 220 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 296 (POOR)
ELLENSBURG 245 (POOR)
GOLDENDALE 425 (FAIR)
TRI-CITIES 142 (POOR)
WALLA WALLA 207 (POOR)
YAKIMA 204 (POOR)
BEND 444 (FAIR)
PRINEVILLE 363 (FAIR)
ENTERPRISE 318 (FAIR)
HERMISTON 226 (POOR)
JOHN DAY 517 (FAIR)
LA GRANDE 278 (POOR)
MADRAS 254 (POOR)
MEACHAM 185 (POOR)
PENDLETON 234 (POOR)
REDMOND 399 (FAIR)
SENECA 754 (GOOD)
THE DALLES 441 (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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