FPCN39 CWLW 291459
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 SATURDAY 29 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      22    5     600   3    100    9     900  30
KAMLOOPS     KEL      19    5     700   3    100   10    1550  30
OKANAGAN     KEL      18    4     650   3    100    9    1250  30
CASTLEGAR    SPOK     21    4     750   5     82    6     750  25
CRANBROOK    SPOK      9    1     950  12      9    4     950  20
REVELSTOKE   KEL      15    3     650   3     81    6     850  20

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   S   28   SW  57
CRANBROOK             SW  19   SW  59

TODAY'S VENTING: Good.

VENTING FOR SUNDAY: 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    1     950  22     87    3    1450  26
PR. GEORGE   P.G.     13    0     750   6     80    2     900  26
SMITHERS     P.G.     10   -1     600   1     68    2     750  18
WELLS GRAY   P.G.     10    0    1000  22     87    3    1500  26
FT NLSN      F.N.      9  -16     400   1     11  -12     600   1
FT STJOHN    F.N.      9    0     700   7      9    1     700   7

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   59   SW  69
SMITHERS              S   41   S   69

TODAY'S VENTING: Good.

VENTING FOR SUNDAY: Good.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY    100    9     950  40    100   11    1250  40
FRASER VLY   HRDY    100    9     900  40    100   12    1400  40
SRN VRISL    HRDY    100    9     850  40    100   11    1150  40
CNTRL VRISL  HRDY    100    8     600  39    100   10    1000  40
NRN VRISL    HRDY      9    7       0  36    100    9     850  40
TERRACE      ANT       9    1     200  18     10    2     200  18
STEWART      ANT       9    4       0   9      9    2       0   9

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  31   SW  46   SW  57
PORT HARDY   S   83   SW  93   SW  91
SANDSPIT     S   13   SW   9   W   11

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

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


END/DB