FPCN39 CWLW 121351
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 THURSDAY 12 FEBRUARY 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      15    4     450   6     48    5     750   8
KAMLOOPS     KEL      57    5     750  15     57    7     750  15
OKANAGAN     KEL      12    3     500   5     38    5     750   8
CASTLEGAR    SPOK     21    3     750   5     22    4     750   5
CRANBROOK    SPOK     10    3     950  16     10    4     950  18
REVELSTOKE   KEL      11    3     500   2     11    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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  24   W   65
CRANBROOK             SW  22   SW  67

TODAY'S VENTING: FAIR TO POOR

VENTING FOR FRIDAY: POOR TO 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.     79    3    1300  30    100    5    1500  37
PR. GEORGE   P.G.     14    3     700  20     47    4     900  20
SMITHERS     P.G.     30    1     650  18     38    2     700  18
WELLS GRAY   P.G.     72    2    1300  30    100    4    1500  37
FT NLSN      F.N.      9  -18     400   3      9  -14     400   3
FT STJOHN    F.N.      9   -2    1000   7     29    1    1000   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   54   SW  69
SMITHERS              SW  44   SW  69

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR EAST OF THE ROCKIES

VENTING FOR FRIDAY: FAIR TO GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    8     100  25     67   10     400  25
FRASER VLY   QUIL     12    8      50  25     70   10     400  25
SRN VRISL    QUIL     98   10     450  25     92   12     600  25
CNTRL VRISL  QUIL      9    6      50  20     39    7     200  20
NRN VRISL    HRDY    100    8     550  30    100   10     600  30
TERRACE      ANT      10    3     200  22     44    5     400  22
STEWART      ANT       9    3       0  20     67    5     400  20

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   39   SW  52   SW  61
PORT HARDY   S   52   S   59   S   65
SANDSPIT     S   63   S   67   S   67

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR FRIDAY: GOOD TO FAIR

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


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