637
AUUS46 KPDT 301225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON MAR 30 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS W 8-14 MPH. N 5-9 MPH.
TRANSPORT WINDS W 8-14 MPH. N 5-9 MPH.
MIXING HEIGHT 2000 FT MSL. 6500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE MAR 31 POOR.
OUTLOOK FOR WED APR 1 FAIR.
VENTILATION INDEX (CATEGORY) 138 (POOR). 275 (POOR).
OUTLOOK FOR TUE MAR 31 94 (POOR).
OUTLOOK FOR WED APR 1 171 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 7-13 MPH. E 3-6 MPH.
TRANSPORT WINDS NW 7-13 MPH. E 5-7 MPH.
MIXING HEIGHT NEAR SURFACE. 6500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR TUE MAR 31 POOR.
OUTLOOK FOR WED APR 1 POOR.
VENTILATION INDEX (CATEGORY) 109 (POOR). 210 (POOR).
OUTLOOK FOR TUE MAR 31 57 (POOR).
OUTLOOK FOR WED APR 1 163 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 7-16 MPH. N 6-12 MPH.
TRANSPORT WINDS NW 9-16 MPH. NW 7-12 MPH.
MIXING HEIGHT 5000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY FAIR. FAIR.
OUTLOOK FOR TUE MAR 31 FAIR.
OUTLOOK FOR WED APR 1 GOOD.
VENTILATION INDEX (CATEGORY) 254 (POOR). 354 (FAIR).
OUTLOOK FOR TUE MAR 31 244 (POOR).
OUTLOOK FOR WED APR 1 588 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS W 8-15 MPH. N 5-9 MPH.
TRANSPORT WINDS W 9-13 MPH. N 5-9 MPH.
MIXING HEIGHT 2500 FT MSL. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR TUE MAR 31 POOR.
OUTLOOK FOR WED APR 1 GOOD.
VENTILATION INDEX (CATEGORY) 186 (POOR). 271 (POOR).
OUTLOOK FOR TUE MAR 31 105 (POOR).
OUTLOOK FOR WED APR 1 341 (FAIR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 259 (POOR)
ELLENSBURG 158 (POOR)
GOLDENDALE 358 (FAIR)
TRI-CITIES 232 (POOR)
WALLA WALLA 175 (POOR)
YAKIMA 108 (POOR)
BEND 130 (POOR)
PRINEVILLE 186 (POOR)
ENTERPRISE 341 (FAIR)
HERMISTON 208 (POOR)
JOHN DAY 257 (POOR)
LA GRANDE 357 (FAIR)
MADRAS 262 (POOR)
MEACHAM 188 (POOR)
PENDLETON 234 (POOR)
REDMOND 202 (POOR)
SENECA 239 (POOR)
THE DALLES 348 (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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