498
AUUS46 KPDT 141206
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
506 AM PDT WED MAY 14 2025

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 15-26 MPH.       SW 17-23 MPH.
TRANSPORT WINDS               SW 15-26 MPH.       W 17-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU MAY 15        FAIR.
OUTLOOK FOR FRI MAY 16        GOOD.

VENTILATION INDEX (CATEGORY)  282 (POOR).         1002 (GOOD).
OUTLOOK FOR THU MAY 15        526 (FAIR).
OUTLOOK FOR FRI MAY 16        603 (GOOD).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-11 MPH.         W 12-16 MPH.
TRANSPORT WINDS               W 6-11 MPH.         W 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU MAY 15        FAIR.
OUTLOOK FOR FRI MAY 16        FAIR.

VENTILATION INDEX (CATEGORY)  168 (POOR).         812 (GOOD).
OUTLOOK FOR THU MAY 15        288 (POOR).
OUTLOOK FOR FRI MAY 16        356 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-10 MPH.         W 13-18 MPH.
TRANSPORT WINDS               W 11-15 MPH.        W 15-17 MPH.
MIXING HEIGHT                 5000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU MAY 15        GOOD.
OUTLOOK FOR FRI MAY 16        FAIR.

VENTILATION INDEX (CATEGORY)  311 (FAIR).         631 (GOOD).
OUTLOOK FOR THU MAY 15        425 (FAIR).
OUTLOOK FOR FRI MAY 16        342 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 13-25 MPH.       SW 17-24 MPH.
TRANSPORT WINDS               SW 17-24 MPH.       W 19-23 MPH.
MIXING HEIGHT                 2500 FT MSL.        6000 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU MAY 15        FAIR.
OUTLOOK FOR FRI MAY 16        FAIR.

VENTILATION INDEX (CATEGORY)  323 (FAIR).         894 (GOOD).
OUTLOOK FOR THU MAY 15        472 (FAIR).
OUTLOOK FOR FRI MAY 16        500 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      784 (GOOD)
ELLENSBURG   1040 (GOOD)
GOLDENDALE   1050 (GOOD)
TRI-CITIES    865 (GOOD)
WALLA WALLA   825 (GOOD)
YAKIMA        829 (GOOD)
BEND          525 (FAIR)
PRINEVILLE    725 (GOOD)
ENTERPRISE    690 (GOOD)
HERMISTON    1027 (GOOD)
JOHN DAY      617 (GOOD)
LA GRANDE     707 (GOOD)
MADRAS        636 (GOOD)
MEACHAM       545 (FAIR)
PENDLETON    1049 (GOOD)
REDMOND       805 (GOOD)
SENECA        722 (GOOD)
THE DALLES   1050 (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.
$$