Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 211334
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
534 AM PST WED FEB 21 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N-NW 4-9 MPH.       NW 3-5 MPH.
TRANSPORT WINDS               N-NW 4-9 MPH.       SW 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU FEB 22        FAIR.

VENTILATION INDEX (CATEGORY)  32 (POOR).          77 (POOR).
OUTLOOK FOR THU FEB 22        455 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N-NW 4-8 MPH.       S-SW 4-5 MPH.
TRANSPORT WINDS               N-NW 4-8 MPH.       S-SW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU FEB 22        FAIR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          97 (POOR).
OUTLOOK FOR THU FEB 22        492 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S-SE 3-7 MPH.       S-SW 3-6 MPH.
TRANSPORT WINDS               S-SE 3-7 MPH.       SW 4-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU FEB 22        FAIR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          125 (POOR).
OUTLOOK FOR THU FEB 22        402 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       98 (POOR)
ELLENSBURG    151 (POOR)
GOLDENDALE    132 (POOR)
TRI-CITIES     46 (POOR)
WALLA WALLA   172 (POOR)
YAKIMA        153 (POOR)
BEND           71 (POOR)
PRINEVILLE     96 (POOR)
ENTERPRISE    133 (POOR)
HERMISTON      30 (POOR)
JOHN DAY      138 (POOR)
LA GRANDE     110 (POOR)
MADRAS         28 (POOR)
MEACHAM       124 (POOR)
PENDLETON     108 (POOR)
REDMOND        71 (POOR)
SENECA        213 (POOR)
THE DALLES    122 (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/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT

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



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