Daily Dispersion Outlook
Issued by NWS Pendleton, OR

000
AUUS46 KPDT 191100
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
400 AM PDT FRI APR 19 2024

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 3-11 MPH.         NE 10-14 MPH.
TRANSPORT WINDS               N 4-12 MPH.         NE 10-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT APR 20        POOR.
OUTLOOK FOR SUN APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  59 (POOR).          670 (GOOD).
OUTLOOK FOR SAT APR 20        161 (POOR).
OUTLOOK FOR SUN APR 21        1030 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 6-11 MPH.        NE 12-16 MPH.
TRANSPORT WINDS               N 7-12 MPH.         E 14-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT APR 20        POOR.
OUTLOOK FOR SUN APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  116 (POOR).         993 (GOOD).
OUTLOOK FOR SAT APR 20        176 (POOR).
OUTLOOK FOR SUN APR 21        930 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          N 5-6 MPH.
TRANSPORT WINDS               NE 3-7 MPH.         E 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 20        GOOD.
OUTLOOK FOR SUN APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  51 (POOR).          299 (POOR).
OUTLOOK FOR SAT APR 20        742 (GOOD).
OUTLOOK FOR SUN APR 21        834 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-6 MPH.          N 7-12 MPH.
TRANSPORT WINDS               E 5-10 MPH.         NE 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 20        POOR.
OUTLOOK FOR SUN APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  67 (POOR).          505 (FAIR).
OUTLOOK FOR SAT APR 20        98 (POOR).
OUTLOOK FOR SUN APR 21        949 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM     1050 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE   1050 (GOOD)
TRI-CITIES    845 (GOOD)
WALLA WALLA   437 (FAIR)
YAKIMA       1050 (GOOD)
BEND          287 (POOR)
PRINEVILLE    208 (POOR)
ENTERPRISE    365 (FAIR)
HERMISTON     683 (GOOD)
JOHN DAY      358 (FAIR)
LA GRANDE     383 (FAIR)
MADRAS        554 (FAIR)
MEACHAM       384 (FAIR)
PENDLETON     537 (FAIR)
REDMOND       302 (FAIR)
SENECA        502 (FAIR)
THE DALLES   1029 (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:
HTTP://WWW.WRH.NOAA.GOV/PDT/GFORECAST/GINDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$