544
AUUS46 KPDT 121231
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
531 AM PDT WED MAR 12 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         S 7-12 MPH.
TRANSPORT WINDS               SE 5-7 MPH.         S 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU MAR 13        GOOD.
OUTLOOK FOR FRI MAR 14        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          213 (POOR).
OUTLOOK FOR THU MAR 13        1050 (GOOD).
OUTLOOK FOR FRI MAR 14        659 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-6 MPH.         SW 5-9 MPH.
TRANSPORT WINDS               SE 3-6 MPH.         S 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU MAR 13        GOOD.
OUTLOOK FOR FRI MAR 14        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          85 (POOR).
OUTLOOK FOR THU MAR 13        1050 (GOOD).
OUTLOOK FOR FRI MAR 14        325 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-11 MPH.         S 20-30 MPH.
TRANSPORT WINDS               S 2-5 MPH.          S 16-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU MAR 13        GOOD.
OUTLOOK FOR FRI MAR 14        GOOD.

VENTILATION INDEX (CATEGORY)  28 (POOR).          323 (FAIR).
OUTLOOK FOR THU MAR 13        685 (GOOD).
OUTLOOK FOR FRI MAR 14        668 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-7 MPH.          S 11-16 MPH.
TRANSPORT WINDS               S 5-7 MPH.          SW 8-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU MAR 13        GOOD.
OUTLOOK FOR FRI MAR 14        GOOD.

VENTILATION INDEX (CATEGORY)  26 (POOR).          267 (POOR).
OUTLOOK FOR THU MAR 13        1004 (GOOD).
OUTLOOK FOR FRI MAR 14        723 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       66 (POOR)
ELLENSBURG     90 (POOR)
GOLDENDALE     26 (POOR)
TRI-CITIES    182 (POOR)
WALLA WALLA   246 (POOR)
YAKIMA         66 (POOR)
BEND          578 (FAIR)
PRINEVILLE    612 (GOOD)
ENTERPRISE    335 (FAIR)
HERMISTON     161 (POOR)
JOHN DAY      539 (FAIR)
LA GRANDE     347 (FAIR)
MADRAS        321 (FAIR)
MEACHAM       288 (POOR)
PENDLETON     184 (POOR)
REDMOND       570 (FAIR)
SENECA        267 (POOR)
THE DALLES     48 (POOR)

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.
$$