437
AUUS46 KPDT 261225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE MAY 26 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 9-17 MPH. SW 3-6 MPH.
TRANSPORT WINDS SW 10-17 MPH. W 5-7 MPH.
MIXING HEIGHT 2000 FT MSL. 4500 FT MSL.
DISPERSION CATEGORY FAIR. POOR.
OUTLOOK FOR WED MAY 27 FAIR.
OUTLOOK FOR THU MAY 28 FAIR.
VENTILATION INDEX (CATEGORY) 175 (POOR). 208 (POOR).
OUTLOOK FOR WED MAY 27 253 (POOR).
OUTLOOK FOR THU MAY 28 231 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 4-7 MPH. NE 4-9 MPH.
TRANSPORT WINDS W 5-9 MPH. N 6-11 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 27 FAIR.
OUTLOOK FOR THU MAY 28 POOR.
VENTILATION INDEX (CATEGORY) 99 (POOR). 340 (FAIR).
OUTLOOK FOR WED MAY 27 423 (FAIR).
OUTLOOK FOR THU MAY 28 238 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 11-19 MPH. NW 8-15 MPH.
TRANSPORT WINDS NW 12-18 MPH. NW 9-16 MPH.
MIXING HEIGHT 4500 FT MSL. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR WED MAY 27 FAIR.
OUTLOOK FOR THU MAY 28 FAIR.
VENTILATION INDEX (CATEGORY) 200 (POOR). 243 (POOR).
OUTLOOK FOR WED MAY 27 390 (FAIR).
OUTLOOK FOR THU MAY 28 257 (POOR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 5-13 MPH. W 3-6 MPH.
TRANSPORT WINDS SW 8-13 MPH. W 5-7 MPH.
MIXING HEIGHT 2500 FT MSL. 3500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR WED MAY 27 FAIR.
OUTLOOK FOR THU MAY 28 FAIR.
VENTILATION INDEX (CATEGORY) 150 (POOR). 166 (POOR).
OUTLOOK FOR WED MAY 27 230 (POOR).
OUTLOOK FOR THU MAY 28 224 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 383 (FAIR)
ELLENSBURG 651 (GOOD)
GOLDENDALE 395 (FAIR)
TRI-CITIES 170 (POOR)
WALLA WALLA 165 (POOR)
YAKIMA 475 (FAIR)
BEND 657 (GOOD)
PRINEVILLE 707 (GOOD)
ENTERPRISE 155 (POOR)
HERMISTON 204 (POOR)
JOHN DAY 271 (POOR)
LA GRANDE 226 (POOR)
MADRAS 623 (GOOD)
MEACHAM 126 (POOR)
PENDLETON 180 (POOR)
REDMOND 677 (GOOD)
SENECA 348 (FAIR)
THE DALLES 688 (GOOD)
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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