FPCN39 CWLW 151500
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 MONDAY 15 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      92    6     900  20     95    7     950  20
KAMLOOPS     KEL      19    3     750   7     90    7    1150  18
OKANAGAN     KEL      18    2     600  10     60    5     900  12
CASTLEGAR    SPOK     45    1     900  10     57    2     950  14
CRANBROOK    SPOK     78    2    1450  20     85    3    1550  20
REVELSTOKE   KEL      15    1     600   4     41    3     900   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   17   S   35   SW  67
CRANBROOK             SW  17   SW  52

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR TUESDAY: FAIR TO 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    0     950  12    100    4    3950  30
PR. GEORGE   P.G.     10    0     700   8     30    3     900  10
SMITHERS     P.G.      9    0     500   4     27    2     750   8
WELLS GRAY   P.G.     30    0    1150  12     60    2    1300  20
FT NLSN      F.N.     25  -10     650   6     29   -8     750   6
FT STJOHN    F.N.     74    1    1700  10     57    2    1250  11

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   67   SW 102
SMITHERS              SW  54   SW 102

TODAY'S VENTING: FAIR TO POOR

VENTING FOR TUESDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     16    7     150  13     90    9     600  26
FRASER VLY   QUIL      9    6      50  13     56    8     350  23
SRN VRISL    QUIL      9    7       0   9     68    9     450  18
CNTRL VRISL  QUIL      9    7      50   9     40    8     350  11
NRN VRISL    HRDY     36    7     300  11    100    9    1150  26
TERRACE      ANT       9    1     200  29     15    2     250  15
STEWART      ANT       9    4       0  10     16    2      75  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   70   S   87   SW  94
PORT HARDY   SW  30   SW  43   SW  56
SANDSPIT     W   41   W   52   SW  67

TODAY'S VENTING: FAIR

VENTING FOR TUESDAY: FAIR

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


END/