997
AUUS46 KPDT 131325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST THU NOV 13 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 2-6 MPH.         SE 6-10 MPH.
TRANSPORT WINDS               SE 3-7 MPH.         S 7-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI NOV 14        GOOD.
OUTLOOK FOR SAT NOV 15        POOR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          54 (POOR).
OUTLOOK FOR FRI NOV 14        386 (FAIR).
OUTLOOK FOR SAT NOV 15        157 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          S 3-6 MPH.
TRANSPORT WINDS               E 2-5 MPH.          S 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI NOV 14        GOOD.
OUTLOOK FOR SAT NOV 15        POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          40 (POOR).
OUTLOOK FOR FRI NOV 14        378 (FAIR).
OUTLOOK FOR SAT NOV 15        78 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 12-20 MPH.        S 16-23 MPH.
TRANSPORT WINDS               S 14-19 MPH.        S 22-26 MPH.
MIXING HEIGHT                 4000 FT MSL.        5500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI NOV 14        FAIR.
OUTLOOK FOR SAT NOV 15        FAIR.

VENTILATION INDEX (CATEGORY)  222 (POOR).         587 (FAIR).
OUTLOOK FOR FRI NOV 14        328 (FAIR).
OUTLOOK FOR SAT NOV 15        238 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-13 MPH.         S 10-14 MPH.
TRANSPORT WINDS               S 8-18 MPH.         S 13-26 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI NOV 14        GOOD.
OUTLOOK FOR SAT NOV 15        POOR.

VENTILATION INDEX (CATEGORY)  95 (POOR).          261 (POOR).
OUTLOOK FOR FRI NOV 14        438 (FAIR).
OUTLOOK FOR SAT NOV 15        182 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       98 (POOR)
ELLENSBURG     61 (POOR)
GOLDENDALE     45 (POOR)
TRI-CITIES     34 (POOR)
WALLA WALLA   124 (POOR)
YAKIMA         39 (POOR)
BEND         1050 (GOOD)
PRINEVILLE    772 (GOOD)
ENTERPRISE    699 (GOOD)
HERMISTON      25 (POOR)
JOHN DAY      688 (GOOD)
LA GRANDE     481 (FAIR)
MADRAS        842 (GOOD)
MEACHAM       430 (FAIR)
PENDLETON     166 (POOR)
REDMOND       730 (GOOD)
SENECA        818 (GOOD)
THE DALLES     30 (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.
$$