FPCN39 CWLW 231409
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 PST SUNDAY 23 NOVEMBER 1997 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       9    4     200   7     61    6     700  13
KAMLOOPS     KEL       9    5     600   9     38    6     700   9
OKANAGAN     KEL       9    4     550   8     38    6     700   9
CASTLEGAR    SPOK     23    4     750   6     41    6     950   8
CRANBROOK    SPOK      9    0     950   4     10    2     950   8
REVELSTOKE   KEL       9    4     600   5     22    5     700   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  30   SW  76
CRANBROOK             SW  24   SW  69

TODAY'S VENTING: FAIR TO POOR

VENTING FOR MONDAY:  POOR

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.     33    3    1050  16     60    4    1350  16
PR. GEORGE   P.G.      9    1     700  12     28    3     800  16
SMITHERS     P.G.     10    1     650   5     21    3     700   7
WELLS GRAY   P.G.     16    1    1050  15     54    2    1350  16
FT NLSN      F.N.     11   -8     550   1     11   -6     600   1
FT STJOHN    F.N.      9   -1     700   1     12    2     900   4


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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   63   SW  82
SMITHERS              S   41   S   82

TODAY'S VENTING: POOR TO FAIR

VENTING FOR MONDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12   10     100  21     87   11     600  25
FRASER VLY   QUIL     12   10      50  21     89   12     600  25
SRN VRISL    QUIL     20   11      50  21     87   12     500  27
CNTRL VRISL  QUIL      9    8      50  21     66    7     400  21
NRN VRISL    HRDY     10    9      50  21     67   10     400  21
TERRACE      ANT       9    2     200  10     14    4     250  14
STEWART      ANT       9    6       0  10     34    4     200  14


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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  54   SW  72   SW  76
PORT HARDY   S   74   SW  82   SW  78
SANDSPIT     SW  24   S   30   S   37

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: FAIR

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


END/MWSO