FPCN39 CWLW 051456
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 5 JANUARY 1998 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       9   -6     200   2      9   -1     800   2
KAMLOOPS     KEL       9   -6     350   2      9   -4     350   2
OKANAGAN     KEL      12   -2     500   2     34    0     800   2
CASTLEGAR    SPOK      9   -1     500   5      9   -1     500   5
CRANBROOK    SPOK      9   -7     500  12      9   -7    1000   5
REVELSTOKE   KEL       9   -4     450   2     10   -3     500   2

*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    9   SW  30   W   69
CRANBROOK             SW  26   SW  76

TODAY'S VENTING: Generally poor.


VENTING FOR TUESDAY: 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.     31  -14    1150  12     45  -11    1300  12
PR. GEORGE   P.G.     36  -16    1000   9     39  -14    1050   9
SMITHERS     P.G.     44  -13    1050   8     46  -12    1100   8
WELLS GRAY   P.G.     27  -14    1150  12     38  -12    1250  12
FT NLSN      F.N.      9  -28     400   7     38  -27     850   7
FT STJOHN    F.N.     25  -26     950   7     25  -26     950   7

*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            SW  37   SW  44
SMITHERS              S   28   SW  44

TODAY'S VENTING: FAIR


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     11    5     100  26     60    6    1200  26
FRASER VLY   QUIL      9    4      50  26     39    4     650  26
SRN VRISL    QUIL      9    5       0   7     54    7    1250  17
CNTRL VRISL  QUIL      9    2      50   7     39    3     400   7
NRN VRISL    HRDY      9    2       0  20     60    3    1000  20
TERRACE      ANT       9   -9     200   7      9   -8     200   7
STEWART      ANT       9   -3       0  13      9   -8       0  13

*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    SW  33   SW  46   SW  56
PORT HARDY   SW  35   SW  43   SW  52
SANDSPIT     W   35   W   35   W   35

TODAY'S VENTING: Generally good on the South Coast. Poor on the North
Coast.

VENTING FOR TUESDAY: POOR


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


END/GF