097
AUUS46 KPDT 231225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUL 23 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 8-18 MPH. W 9-14 MPH.
TRANSPORT WINDS SW 10-18 MPH. W 9-15 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR FRI JUL 24 FAIR.
OUTLOOK FOR SAT JUL 25 GOOD.
VENTILATION INDEX (CATEGORY) 133 (POOR). 457 (FAIR).
OUTLOOK FOR FRI JUL 24 397 (FAIR).
OUTLOOK FOR SAT JUL 25 755 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 3-8 MPH. S 5-9 MPH.
TRANSPORT WINDS W 5-10 MPH. SW 6-11 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR FRI JUL 24 FAIR.
OUTLOOK FOR SAT JUL 25 GOOD.
VENTILATION INDEX (CATEGORY) 63 (POOR). 325 (FAIR).
OUTLOOK FOR FRI JUL 24 530 (FAIR).
OUTLOOK FOR SAT JUL 25 1047 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 0-2 MPH. NE 4-5 MPH.
TRANSPORT WINDS W 3-5 MPH. SW 5-9 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR FRI JUL 24 GOOD.
OUTLOOK FOR SAT JUL 25 GOOD.
VENTILATION INDEX (CATEGORY) 29 (POOR). 336 (FAIR).
OUTLOOK FOR FRI JUL 24 623 (GOOD).
OUTLOOK FOR SAT JUL 25 613 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 4-13 MPH. W 7-12 MPH.
TRANSPORT WINDS SW 8-16 MPH. W 9-13 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR FRI JUL 24 FAIR.
OUTLOOK FOR SAT JUL 25 FAIR.
VENTILATION INDEX (CATEGORY) 110 (POOR). 363 (FAIR).
OUTLOOK FOR FRI JUL 24 381 (FAIR).
OUTLOOK FOR SAT JUL 25 499 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 236 (POOR)
ELLENSBURG 607 (GOOD)
GOLDENDALE 442 (FAIR)
TRI-CITIES 316 (FAIR)
WALLA WALLA 364 (FAIR)
YAKIMA 257 (POOR)
BEND 622 (GOOD)
PRINEVILLE 469 (FAIR)
ENTERPRISE 604 (GOOD)
HERMISTON 506 (FAIR)
JOHN DAY 960 (GOOD)
LA GRANDE 328 (FAIR)
MADRAS 398 (FAIR)
MEACHAM 261 (POOR)
PENDLETON 488 (FAIR)
REDMOND 451 (FAIR)
SENECA 1050 (GOOD)
THE DALLES 470 (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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