984
AUUS46 KPDT 171225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED SEP 17 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 1-7 MPH. NW 3-5 MPH.
TRANSPORT WINDS S 3-7 MPH. W 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 4000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU SEP 18 POOR.
OUTLOOK FOR FRI SEP 19 POOR.
VENTILATION INDEX (CATEGORY) 28 (POOR). 102 (POOR).
OUTLOOK FOR THU SEP 18 127 (POOR).
OUTLOOK FOR FRI SEP 19 166 (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 2-5 MPH.
TRANSPORT WINDS NW 4-7 MPH. S 3-6 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU SEP 18 POOR.
OUTLOOK FOR FRI SEP 19 POOR.
VENTILATION INDEX (CATEGORY) 36 (POOR). 121 (POOR).
OUTLOOK FOR THU SEP 18 119 (POOR).
OUTLOOK FOR FRI SEP 19 87 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 4-8 MPH. S 5-6 MPH.
TRANSPORT WINDS SE 4-8 MPH. S 9-11 MPH.
MIXING HEIGHT 4000 FT MSL. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR THU SEP 18 GOOD.
OUTLOOK FOR FRI SEP 19 GOOD.
VENTILATION INDEX (CATEGORY) 75 (POOR). 518 (FAIR).
OUTLOOK FOR THU SEP 18 296 (POOR).
OUTLOOK FOR FRI SEP 19 192 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SE 5-10 MPH. N 4-5 MPH.
TRANSPORT WINDS SE 6-12 MPH. SW 5-6 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU SEP 18 POOR.
OUTLOOK FOR FRI SEP 19 FAIR.
VENTILATION INDEX (CATEGORY) 48 (POOR). 157 (POOR).
OUTLOOK FOR THU SEP 18 107 (POOR).
OUTLOOK FOR FRI SEP 19 170 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 197 (POOR)
ELLENSBURG 272 (POOR)
GOLDENDALE 158 (POOR)
TRI-CITIES 71 (POOR)
WALLA WALLA 145 (POOR)
YAKIMA 150 (POOR)
BEND 180 (POOR)
PRINEVILLE 136 (POOR)
ENTERPRISE 119 (POOR)
HERMISTON 76 (POOR)
JOHN DAY 292 (POOR)
LA GRANDE 509 (FAIR)
MADRAS 105 (POOR)
MEACHAM 228 (POOR)
PENDLETON 123 (POOR)
REDMOND 78 (POOR)
SENECA 341 (FAIR)
THE DALLES 216 (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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