FPCN39 CWLW 291342
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 29 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      62   13     850  10     64   14     950  10
KAMLOOPS     KEL       9    3     350   8     27    6     600   8
OKANAGAN     KEL      20    5     500   8     37    7     650  11
CASTLEGAR    SPOK      9    4     500  16      9    4     500  16
CRANBROOK    SPOK      9    1     950  32      9    3     950  32
REVELSTOKE   KEL       9    0     450   8      9    1     450   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    W   13   W   43   W   82
CRANBROOK             W   20   W   67

TODAY'S VENTING: generally poor. Good in the Canyon.

VENTING FOR TUESDAY: generally 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.      9    1     950  37      9    3     950  37
PR. GEORGE   P.G.      9    2     700  19      9    4     700  19
SMITHERS     P.G.      9    1     500   7     16    4     650   7
WELLS GRAY   P.G.     10    2    1000  37     10    4    1000  37
FT NLSN      F.N.     20  -13     500  11     28  -12     550  11
FT STJOHN    F.N.     53    3     900  24    100    4    1400  28

*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            W   43   W   57
SMITHERS              W   37   W   57

TODAY'S VENTING: generally poor. Good in the Peace.

VENTING FOR TUESDAY: genearlly poor.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     48   11     400  15     52   12     600  12
FRASER VLY   QUIL     46   11     350  15     52   12     550  12
SRN VRISL    QUIL     74   13     700  14     52   14     800  12
CNTRL VRISL  QUIL      9    6      50   7      9    7      50   7
NRN VRISL    HRDY     17    7     100  11     22    8     150  11
TERRACE      ANT      10    3     250  11     10    4     250  11
STEWART      ANT      10    5      50   4      9    4       0   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   41   W   61   W   78
PORT HARDY   SW  28   W   48   W   69
SANDSPIT     VR   5   SW  26   W   43

TODAY'S VENTING: gnerally fair to poor.

VENTING FOR TUESDAY: generally fair to poor.


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

END/dsl