457
AUUS46 KPDT 051229
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
429 AM PST WED FEB 5 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-8 MPH.          S 5-9 MPH.
TRANSPORT WINDS               S 4-8 MPH.          SW 10-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU FEB 6         POOR.
OUTLOOK FOR FRI FEB 7         FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          124 (POOR).
OUTLOOK FOR THU FEB 6         84 (POOR).
OUTLOOK FOR FRI FEB 7         190 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 VRB 2-5 MPH.        S 5-7 MPH.
TRANSPORT WINDS               SE 2-5 MPH.         S 10-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU FEB 6         POOR.
OUTLOOK FOR FRI FEB 7         FAIR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          195 (POOR).
OUTLOOK FOR THU FEB 6         79 (POOR).
OUTLOOK FOR FRI FEB 7         104 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 10-25 MPH.        S 11-14 MPH.
TRANSPORT WINDS               WSW 6-10 MPH.       S 17-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU FEB 6         FAIR.
OUTLOOK FOR FRI FEB 7         FAIR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          463 (FAIR).
OUTLOOK FOR THU FEB 6         184 (POOR).
OUTLOOK FOR FRI FEB 7         308 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-12 MPH.        S 7-12 MPH.
TRANSPORT WINDS               SW 4-12 MPH.        SW 12-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU FEB 6         POOR.
OUTLOOK FOR FRI FEB 7         FAIR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          281 (POOR).
OUTLOOK FOR THU FEB 6         56 (POOR).
OUTLOOK FOR FRI FEB 7         200 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      202 (POOR)
ELLENSBURG    132 (POOR)
GOLDENDALE    162 (POOR)
TRI-CITIES    143 (POOR)
WALLA WALLA   117 (POOR)
YAKIMA        186 (POOR)
BEND          658 (GOOD)
PRINEVILLE    570 (FAIR)
ENTERPRISE    471 (FAIR)
HERMISTON      83 (POOR)
JOHN DAY      821 (GOOD)
LA GRANDE     493 (FAIR)
MADRAS        485 (FAIR)
MEACHAM       596 (FAIR)
PENDLETON     178 (POOR)
REDMOND       494 (FAIR)
SENECA        922 (GOOD)
THE DALLES    144 (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.

$$