917
AUUS46 KPDT 201225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU AUG 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 S 1-7 MPH. NW 3-6 MPH.
TRANSPORT WINDS S 5-9 MPH. W 4-6 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR FRI AUG 21 FAIR.
OUTLOOK FOR SAT AUG 22 GOOD.
VENTILATION INDEX (CATEGORY) 40 (POOR). 167 (POOR).
OUTLOOK FOR FRI AUG 21 189 (POOR).
OUTLOOK FOR SAT AUG 22 528 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-5 MPH. SE 2-6 MPH.
TRANSPORT WINDS NW 4-8 MPH. SW 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 21 POOR.
OUTLOOK FOR SAT AUG 22 GOOD.
VENTILATION INDEX (CATEGORY) 33 (POOR). 209 (POOR).
OUTLOOK FOR FRI AUG 21 112 (POOR).
OUTLOOK FOR SAT AUG 22 644 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NE 0-0 MPH. NW 3-5 MPH.
TRANSPORT WINDS N 2-4 MPH. W 7-8 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI AUG 21 FAIR.
OUTLOOK FOR SAT AUG 22 GOOD.
VENTILATION INDEX (CATEGORY) 26 (POOR). 237 (POOR).
OUTLOOK FOR FRI AUG 21 150 (POOR).
OUTLOOK FOR SAT AUG 22 532 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 2-6 MPH. NW 5-7 MPH.
TRANSPORT WINDS S 4-8 MPH. NW 6-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI AUG 21 FAIR.
OUTLOOK FOR SAT AUG 22 FAIR.
VENTILATION INDEX (CATEGORY) 33 (POOR). 204 (POOR).
OUTLOOK FOR FRI AUG 21 217 (POOR).
OUTLOOK FOR SAT AUG 22 433 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 331 (FAIR)
ELLENSBURG 262 (POOR)
GOLDENDALE 303 (FAIR)
TRI-CITIES 106 (POOR)
WALLA WALLA 195 (POOR)
YAKIMA 219 (POOR)
BEND 553 (FAIR)
PRINEVILLE 406 (FAIR)
ENTERPRISE 396 (FAIR)
HERMISTON 133 (POOR)
JOHN DAY 536 (FAIR)
LA GRANDE 241 (POOR)
MADRAS 214 (POOR)
MEACHAM 204 (POOR)
PENDLETON 202 (POOR)
REDMOND 456 (FAIR)
SENECA 766 (GOOD)
THE DALLES 284 (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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