FPCN39 CWLW 281450
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 FRIDAY 28 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      19    7     200  40      9    9     200  40
KAMLOOPS     KEL      77    8     600  40    100   10    1150  40
OKANAGAN     KEL       9    6     350  30     98    9     900  30
CASTLEGAR    SPOK      9    4     500  30     73    6     800  30
CRANBROOK    SPOK      9    5     950  30     69    6    1200  30
REVELSTOKE   KEL       9    5     450   2     80    8     850  40

*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   W   15   W   30
CRANBROOK             W   17   W   52

TODAY'S VENTING: Good.

VENTING FOR SATURDAY: 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    4     950  28     93    5    1450  29
PR. GEORGE   P.G.      9    3     700  24     66    5    1000  24
SMITHERS     P.G.      9    1     500   2     40    3     700  20
WELLS GRAY   P.G.     10    3    1000  28     79    4    1350  29
FT NLSN      F.N.      9  -15     400   1     15  -10     650   5
FT STJOHN    F.N.     18    0    1000   3     64    4    1450  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   57   W   72
SMITHERS              SW  46   SW  72

TODAY'S VENTING: Fair to 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      9   11     100  49     88   12     350  49
FRASER VLY   QUIL     81   12     300  49    100   13     600  49
SRN VRISL    QUIL      9   10       0  18     88   11     600  18
CNTRL VRISL  QUIL      9   10      50  18     80   10     500  18
NRN VRISL    HRDY     10    7      50  21    100    9     700  28
TERRACE      ANT       9    1     200  20     60    4     500  20
STEWART      ANT       9    3       0   8      9    2       0   8

*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    SE  17   S   19   SW  30
PORT HARDY   S   41   S   44   SW  52
SANDSPIT     S   56   SW  65   SW  76

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/DB