FPCN39 CWLW 101419
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 10 JANUARY 1999 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      21    4     600   3     70    8    1200   9
KAMLOOPS     KEL      15    2     550   3     34    4     750   7
OKANAGAN     KEL      15    2     550   3     34    4     750   7
CASTLEGAR    SPOK      9    2     500   3     18    3     800   3
CRANBROOK    SPOK      9   -5     950  11      9    2     950  11
REVELSTOKE   KEL      22    2     650   7     28    3     750   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  13   W   39   W   93
CRANBROOK             W   24   W   76

TODAY'S VENTING: GENERALLY POOR TO FAIR.


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.     29    0    1050  17     47    2    1200  17
PR. GEORGE   P.G.     26    0     850  11     47    2    1050  13
SMITHERS     P.G.     10   -3     650   1     24    2     900   4
WELLS GRAY   P.G.     10   -1    1000  12     45    2    1200  17
FT NLSN      F.N.      9  -23     700   0      9  -23     700   0
FT STJOHN    F.N.     55  -21    1250  10     41  -20    1100  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
PR. GEORGE            SW  54   W   80
SMITHERS              W   57   W   80

TODAY'S VENTING: POOR TO FAIR.


VENTING FOR MONDAY: FAIR.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  18     50    9     350  23
FRASER VLY   QUIL      9    6      50  18     50    9     300  23
SRN VRISL    QUIL      9    7       0   8     36    9     250  13
CNTRL VRISL  QUIL      9    7      50   8     36    9     250  13
NRN VRISL    HRDY     58    7     400  16     72    9     600  16
TERRACE      ANT       9    1     200  32     11    3     250  32
STEWART      ANT      10    1     100  15     10    3     100  16

*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    SW  50   SW  74   W   85
PORT HARDY   W   52   W   69   W   74
SANDSPIT     W   61   W   72   W   74

TODAY'S VENTING: FAIR ON THE SOUTH COAST. POOR IN THE NORTH.


VENTING FOR MONDAY: FAIR


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


END/GF