378
AUUS46 KPDT 191225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED AUG 19 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 4-12 MPH. W 5-9 MPH.
TRANSPORT WINDS SW 7-13 MPH. SW 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU AUG 20 FAIR.
OUTLOOK FOR FRI AUG 21 FAIR.
VENTILATION INDEX (CATEGORY) 91 (POOR). 315 (FAIR).
OUTLOOK FOR THU AUG 20 247 (POOR).
OUTLOOK FOR FRI AUG 21 141 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 0-5 MPH. SE 2-6 MPH.
TRANSPORT WINDS W 4-8 MPH. SW 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR THU AUG 20 FAIR.
OUTLOOK FOR FRI AUG 21 POOR.
VENTILATION INDEX (CATEGORY) 32 (POOR). 188 (POOR).
OUTLOOK FOR THU AUG 20 251 (POOR).
OUTLOOK FOR FRI AUG 21 129 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 0-1 MPH. N 2-4 MPH.
TRANSPORT WINDS SW 3-5 MPH. W 8-10 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR THU AUG 20 GOOD.
OUTLOOK FOR FRI AUG 21 GOOD.
VENTILATION INDEX (CATEGORY) 27 (POOR). 345 (FAIR).
OUTLOOK FOR THU AUG 20 290 (POOR).
OUTLOOK FOR FRI AUG 21 259 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-11 MPH. W 5-7 MPH.
TRANSPORT WINDS S 8-14 MPH. W 7-10 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU AUG 20 FAIR.
OUTLOOK FOR FRI AUG 21 FAIR.
VENTILATION INDEX (CATEGORY) 92 (POOR). 286 (POOR).
OUTLOOK FOR THU AUG 20 259 (POOR).
OUTLOOK FOR FRI AUG 21 194 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 275 (POOR)
ELLENSBURG 303 (FAIR)
GOLDENDALE 321 (FAIR)
TRI-CITIES 303 (FAIR)
WALLA WALLA 290 (POOR)
YAKIMA 168 (POOR)
BEND 438 (FAIR)
PRINEVILLE 394 (FAIR)
ENTERPRISE 463 (FAIR)
HERMISTON 318 (FAIR)
JOHN DAY 583 (FAIR)
LA GRANDE 402 (FAIR)
MADRAS 218 (POOR)
MEACHAM 298 (POOR)
PENDLETON 278 (POOR)
REDMOND 386 (FAIR)
SENECA 745 (GOOD)
THE DALLES 318 (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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