093
AUUS46 KPDT 271225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED MAY 27 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 3-7 MPH. N 5-10 MPH.
TRANSPORT WINDS SW 4-7 MPH. N 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU MAY 28 FAIR.
OUTLOOK FOR FRI MAY 29 GOOD.
VENTILATION INDEX (CATEGORY) 38 (POOR). 315 (FAIR).
OUTLOOK FOR THU MAY 28 318 (FAIR).
OUTLOOK FOR FRI MAY 29 877 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-7 MPH. NE 5-7 MPH.
TRANSPORT WINDS NW 6-12 MPH. NE 9-11 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU MAY 28 POOR.
OUTLOOK FOR FRI MAY 29 FAIR.
VENTILATION INDEX (CATEGORY) 95 (POOR). 530 (FAIR).
OUTLOOK FOR THU MAY 28 298 (POOR).
OUTLOOK FOR FRI MAY 29 613 (GOOD).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS N 9-16 MPH. N 8-15 MPH.
TRANSPORT WINDS N 12-17 MPH. N 12-16 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU MAY 28 GOOD.
OUTLOOK FOR FRI MAY 29 FAIR.
VENTILATION INDEX (CATEGORY) 163 (POOR). 459 (FAIR).
OUTLOOK FOR THU MAY 28 445 (FAIR).
OUTLOOK FOR FRI MAY 29 466 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 1-5 MPH. N 6-10 MPH.
TRANSPORT WINDS S 3-6 MPH. N 9-12 MPH.
MIXING HEIGHT NEAR SURFACE. 5000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR THU MAY 28 FAIR.
OUTLOOK FOR FRI MAY 29 GOOD.
VENTILATION INDEX (CATEGORY) 35 (POOR). 289 (POOR).
OUTLOOK FOR THU MAY 28 273 (POOR).
OUTLOOK FOR FRI MAY 29 734 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 287 (POOR)
ELLENSBURG 412 (FAIR)
GOLDENDALE 491 (FAIR)
TRI-CITIES 297 (POOR)
WALLA WALLA 254 (POOR)
YAKIMA 565 (FAIR)
BEND 1010 (GOOD)
PRINEVILLE 870 (GOOD)
ENTERPRISE 289 (POOR)
HERMISTON 326 (FAIR)
JOHN DAY 586 (FAIR)
LA GRANDE 444 (FAIR)
MADRAS 921 (GOOD)
MEACHAM 267 (POOR)
PENDLETON 377 (FAIR)
REDMOND 1003 (GOOD)
SENECA 964 (GOOD)
THE DALLES 376 (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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