FPCN39 CWLW 161458
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 TUESDAY 16 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      65    6     550  20     92    8     900  20
KAMLOOPS     KEL      34    6     850  10     65    8    1100  10
OKANAGAN     KEL       9    3     350   0     54    5     900  10
CASTLEGAR    SPOK      9    1     500  11     43    3     850  11
CRANBROOK    SPOK     10    1     950  29     20    3    1050  10
REVELSTOKE   KEL       9    2     450  12     27    3     600  12

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  35   SW  87
CRANBROOK             W   26   W   72

TODAY'S VENTING: FAIR


VENTING FOR WEDNESDAY: 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.     44    2    1100  25     97    3    1400  35
PR. GEORGE   P.G.     11    3     700  25    100    5    1400  35
SMITHERS     P.G.      9    0     500  18     62    2     800  25
WELLS GRAY   P.G.     44    4    1100  25     97    2    1300  35
FT NLSN      F.N.     12  -12     650   4     12  -10     700   4
FT STJOHN    F.N.     13   -1    1100   8     44    1    1200   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  54   SW  76
SMITHERS              SW  46   SW  76

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    9     100  15     26   10     200  15
FRASER VLY   QUIL      9    7      50  15     29    9     200  15
SRN VRISL    QUIL      9   10       0  14     30   11     200  14
CNTRL VRISL  QUIL      9    8      50  14     29    8     200  14
NRN VRISL    HRDY      9    7       0  16     38    8     200  16
TERRACE      ANT       9    2     200   5     12    3     250   5
STEWART      ANT       9    5       0   5     12   3      50   5

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  48   SW  67   SW  74
PORT HARDY   SW  50   SW  56   SW  56
SANDSPIT     NW  57   NW  54   W   44

TODAY'S VENTING: POOR

VENTING FOR WEDNESDAY: POOR

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


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