FPCN39 CWLW 101400
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 10 SEPTEMBER 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      12   15     500   3     74   22    2150   5
KAMLOOPS     KEL      14   14     650   3     70   20    2050   6
OKANAGAN     KEL      14   15     650   3     85   21    2550   6
CASTLEGAR    SPOK      9   13     750   9     50   19    1050   9
CRANBROOK    SPOK      9   10     950   5     56   19    2100   5
REVELSTOKE   KEL      12   16     750   2     40   17    1000   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW  19   NW  30
CRANBROOK             W   11   NW  22

TODAY'S VENTING:  GOOD TO FAIR

VENTING FOR SATURDAY: GOOD TO FAIR


           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     12    9    1000   4    100   14    3950  14
PR. GEORGE   P.G.     12    9     750   5    100   14    2650  15
SMITHERS     P.G.     12    7     650   4    100   13    1850  15
WELLS GRAY   P.G.      9    6    1050   4    100   14    4000  14
FT NLSN      F.N.      9    8     400   5     65   14     800  13
FT STJOHN    F.N.     12    9     750   7     70   14    2600  15

*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            W   30   NW  43
SMITHERS              W   19   W   43

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     60   15     700  13     93   20    1200  13
FRASER VLY   QUIL     32   12     650   5    100   23    1500  13
SRN VRISL    QUIL     38   14     700   5     90   21    1250  11
CNTRL VRISL  QUIL     60   15     750  11     91   22    1300  11
NRN VRISL    HRDY     31   13     450   6    100   16    1300  14
TERRACE      P.G.     32   12     600   5    100   16    1850  15
STEWART      P.G.     32   11     600   5     93   16    1200  13

*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   9   N   13   NW  20
PORT HARDY   NW  19   N   22   NW  24
SANDSPIT     SW  13   SW  19   W   33

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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

END/MWSO
$$$$^^