Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 311230
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
530 AM PDT SAT JUL 31 2021

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-6 MPH.          W 7-14 MPH.
TRANSPORT WINDS               SW 4-8 MPH.         SW 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 1         GOOD.

VENTILATION INDEX (CATEGORY)  27 (POOR).          887 (GOOD).
OUTLOOK FOR SUN AUG 1         906 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         NW 5-10 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         W 7-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN AUG 1         FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          268 (POOR).
OUTLOOK FOR SUN AUG 1         344 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-6 MPH.          SSE 10-15 MPH.
TRANSPORT WINDS               S 4-8 MPH.          WSW 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 1         GOOD.

VENTILATION INDEX (CATEGORY)  26 (POOR).          582 (FAIR).
OUTLOOK FOR SUN AUG 1         308 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      146 (POOR)
ELLENSBURG    447 (FAIR)
GOLDENDALE    556 (FAIR)
TRI-CITIES    807 (GOOD)
WALLA WALLA   868 (GOOD)
YAKIMA        267 (POOR)
BEND          418 (FAIR)
PRINEVILLE    224 (POOR)
ENTERPRISE    196 (POOR)
HERMISTON     923 (GOOD)
JOHN DAY      449 (FAIR)
LA GRANDE     566 (FAIR)
MADRAS        330 (FAIR)
MEACHAM       445 (FAIR)
PENDLETON     744 (GOOD)
REDMOND       353 (FAIR)
SENECA        410 (FAIR)
THE DALLES    245 (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:
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.
$$


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