FPCN39 CWLW 051400
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT THURSDAY 5 AUGUST 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   SPOK     58   26     850   9    100   36    3200   7
KAMLOOPS     SPOK     46   24     850   9    100   32    3350   7
OKANAGAN     SPOK     47   24     850   9    100   32    3350   7
CASTLEGAR    SPOK     39   23     850   9    100   30    3500   7
CRANBROOK    SPOK      9   20     950   8     95   26    3950   5
REVELSTOKE   SPOK     34   21     750   9     64   28    1200  10

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   N   15   N   17
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: FAIR THIS MORNING BECOMING GOOD THIS AFTERNOON.




VENTING FOR FRIDAY: GOOD




CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     10   21     950  24    100   28    3950  13
PR. GEORGE   P.G.     31   21    1000   8    100   27    2000  14
SMITHERS     P.G.     10   21     750   1     79   27    1600  10
WELLS GRAY   P.G.     10   15     550   2    100   28    4000  13
FT NLSN      F.N.      9   22     550   0     85   32    2150   7
FT STJOHN    F.N.      9   20     700   5    100   26    2100   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  13   NE  22
SMITHERS              E   11   E   22

TODAY'S VENTING: GOOD




VENTING FOR FRIDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     51   20     650   9     63   25     950   8
FRASER VLY   QUIL     60   23     800   9    100   31    3050   9
SRN VRISL    QUIL     41   18     550   7     59   24     850   8
CNTRL VRISL  QUIL     50   21     650   8     62   25     900   8
NRN VRISL    HRDY     21   16     450   3     26   20     600   3
TERRACE      ANT      46   23     850   7    100   31    3200   7
STEWART      ANT      13   21     350   1     90   31    3000   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  13   NE  13   NE  17
PORT HARDY   N   17   VR   5   E    9
SANDSPIT     N   17   E    9   SE  20

TODAY'S VENTING: GOOD EXCEPT REMAINING POOR NORTHERN VANCOUVER
ISLAND.





VENTING FOR FRIDAY: FAIR TO GOOD




VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/
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