392
AUUS46 KPDT 311225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUL 31 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 2-8 MPH. N 4-9 MPH.
TRANSPORT WINDS SW 6-11 MPH. N 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT AUG 1 GOOD.
OUTLOOK FOR SUN AUG 2 FAIR.
VENTILATION INDEX (CATEGORY) 61 (POOR). 157 (POOR).
OUTLOOK FOR SAT AUG 1 1045 (GOOD).
OUTLOOK FOR SUN AUG 2 461 (FAIR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 1-4 MPH. E 2-6 MPH.
TRANSPORT WINDS NW 4-8 MPH. S 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SAT AUG 1 GOOD.
OUTLOOK FOR SUN AUG 2 FAIR.
VENTILATION INDEX (CATEGORY) 35 (POOR). 163 (POOR).
OUTLOOK FOR SAT AUG 1 1050 (GOOD).
OUTLOOK FOR SUN AUG 2 367 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 1-3 MPH. N 4-5 MPH.
TRANSPORT WINDS N 5-7 MPH. E 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SAT AUG 1 GOOD.
OUTLOOK FOR SUN AUG 2 FAIR.
VENTILATION INDEX (CATEGORY) 44 (POOR). 294 (POOR).
OUTLOOK FOR SAT AUG 1 543 (FAIR).
OUTLOOK FOR SUN AUG 2 368 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 1-7 MPH. N 6-10 MPH.
TRANSPORT WINDS S 6-12 MPH. N 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 4500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SAT AUG 1 GOOD.
OUTLOOK FOR SUN AUG 2 FAIR.
VENTILATION INDEX (CATEGORY) 56 (POOR). 211 (POOR).
OUTLOOK FOR SAT AUG 1 948 (GOOD).
OUTLOOK FOR SUN AUG 2 465 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 207 (POOR)
ELLENSBURG 233 (POOR)
GOLDENDALE 161 (POOR)
TRI-CITIES 109 (POOR)
WALLA WALLA 169 (POOR)
YAKIMA 203 (POOR)
BEND 38 (POOR)
PRINEVILLE 301 (FAIR)
ENTERPRISE 494 (FAIR)
HERMISTON 114 (POOR)
JOHN DAY 554 (FAIR)
LA GRANDE 300 (POOR)
MADRAS 234 (POOR)
MEACHAM 211 (POOR)
PENDLETON 202 (POOR)
REDMOND 329 (FAIR)
SENECA 1050 (GOOD)
THE DALLES 175 (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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