643
AUUS46 KPDT 201225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED AUG 20 2025
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 5-13 MPH. W 8-11 MPH.
TRANSPORT WINDS SW 8-14 MPH. W 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU AUG 21 FAIR.
OUTLOOK FOR FRI AUG 22 FAIR.
VENTILATION INDEX (CATEGORY) 132 (POOR). 474 (FAIR).
OUTLOOK FOR THU AUG 21 206 (POOR).
OUTLOOK FOR FRI AUG 22 264 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 4-8 MPH. NW 4-8 MPH.
TRANSPORT WINDS NW 5-10 MPH. W 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU AUG 21 POOR.
OUTLOOK FOR FRI AUG 22 FAIR.
VENTILATION INDEX (CATEGORY) 90 (POOR). 401 (FAIR).
OUTLOOK FOR THU AUG 21 185 (POOR).
OUTLOOK FOR FRI AUG 22 388 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 2-6 MPH. NW 9-12 MPH.
TRANSPORT WINDS NW 4-8 MPH. NW 10-12 MPH.
MIXING HEIGHT 4000 FT MSL. 9500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR THU AUG 21 GOOD.
OUTLOOK FOR FRI AUG 22 GOOD.
VENTILATION INDEX (CATEGORY) 125 (POOR). 520 (FAIR).
OUTLOOK FOR THU AUG 21 270 (POOR).
OUTLOOK FOR FRI AUG 22 257 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-14 MPH. W 9-13 MPH.
TRANSPORT WINDS SW 9-16 MPH. W 10-13 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR THU AUG 21 FAIR.
OUTLOOK FOR FRI AUG 22 FAIR.
VENTILATION INDEX (CATEGORY) 163 (POOR). 512 (FAIR).
OUTLOOK FOR THU AUG 21 253 (POOR).
OUTLOOK FOR FRI AUG 22 236 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 682 (GOOD)
ELLENSBURG 800 (GOOD)
GOLDENDALE 655 (GOOD)
TRI-CITIES 419 (FAIR)
WALLA WALLA 499 (FAIR)
YAKIMA 383 (FAIR)
BEND 404 (FAIR)
PRINEVILLE 395 (FAIR)
ENTERPRISE 450 (FAIR)
HERMISTON 433 (FAIR)
JOHN DAY 541 (FAIR)
LA GRANDE 551 (FAIR)
MADRAS 365 (FAIR)
MEACHAM 408 (FAIR)
PENDLETON 584 (FAIR)
REDMOND 387 (FAIR)
SENECA 603 (GOOD)
THE DALLES 719 (GOOD)
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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