FPCN39 CWLW 141401
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 14 DECEMBER 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      17    5     550   2     44    8    1300   8
KAMLOOPS     KEL      13    3     550   2     47    8    1450  16
OKANAGAN     KEL       9    0     450   2     40    3     550  18
CASTLEGAR    SPOK     18    1     850   3     29    3     900  10
CRANBROOK    SPOK      9   -5     950   3     21    1     950   8
REVELSTOKE   KEL      11    2     550   2     36    8     600  10

*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   11   SW  28   SW  65
CRANBROOK             SW  24   SW  72

TODAY'S VENTING: FAIR TO POOR.

VENTING FOR MONDAY: 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.     21    5    1050  20     54    7    1400  20
PR. GEORGE   P.G.     22    6     700  20     54    7    1400  20
SMITHERS     P.G.      9    3     500   7     23    4     500  12
WELLS GRAY   P.G.     33    6    1350  20     58    7    1450  20
FT NLSN      F.N.      9    0     400  13     17    4     450  10
FT STJOHN    F.N.     27    5     700  20     55    7     700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   43   W   56
SMITHERS              SW  35   W   56

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     16    6     100  10     62   11     700  15
FRASER VLY   QUIL     14    7      50  10     55   10     650  12
SRN VRISL    QUIL     19    8      50  12     64   12     800  15
CNTRL VRISL  QUIL     14    9      50  12     52   10     600  12
NRN VRISL    HRDY      9    5       0   7     64    8     850  10
TERRACE      ANT      18    3     200  10     56    5     750  11
STEWART      ANT      16    4     100   5     40    5     550   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   37   W   52   W   54
PORT HARDY   SW  39   SW  48   SW  56
SANDSPIT     SW  33   SW  35   SW  39

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.


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


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