FPCN39 CWLW 061400
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 FRIDAY 6 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   KEL      14   24     650   1    100   33    3200   6
KAMLOOPS     KEL      18   24     800   2     64   31    2050   4
OKANAGAN     KEL       9   22     600   0     54   30    1750   4
CASTLEGAR    SPOK     25   22     800   6     64   30    1400   8
CRANBROOK    SPOK     20   23    1050  10    100   31    3950   8
REVELSTOKE   KEL       9   20     550   0     40   28    1450   3

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

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

TODAY'S VENTING: POOR THIS MORNING BECOMING MARGINALLY GOOD THIS
AFTERNOON.




VENTING FOR SATURDAY: FAIR




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.      9   19     950  13    100   26    3950  14
PR. GEORGE   P.G.     20   21     900   5    100   28    3700  12
SMITHERS     P.G.     18   22     900   2    100   30    3500  10
WELLS GRAY   P.G.     20   15     500   3    100   26    4000  14
FT NLSN      F.N.      9   23     400   0    100   30    2050  12
FT STJOHN    F.N.     25   15     400   5    100   30    3700  11

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   15   E   19
SMITHERS              E   15   SE  19

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.




VENTING FOR SATURDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     38   21     650   6     43   24     750   6
FRASER VLY   QUIL     41   22     650   6     58   28     850   8
SRN VRISL    QUIL     20   18     450   3     36   23     700   5
CNTRL VRISL  QUIL     35   22     650   5     51   28     850   6
NRN VRISL    HRDY     30   15     400   6     33   17     450   6
TERRACE      ANT      63   23     850  11     85   28    1350  11
STEWART      ANT      20   20     400   3     41   28    1200   3

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    NW  13   VR   5   VR   5
PORT HARDY   NW  15   VR   5   VR   5
SANDSPIT     NW  17   VR   5   S   24

TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD IN THE TERRACE AREA.




VENTING FOR SATURDAY: FAIR




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


END/
$$$$^^