FPCN39 CWLW 061437
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 SATURDAY 6 FEBRUARY 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      15    5     450   2     38    7     700   6
KAMLOOPS     KEL      46    6    1000   7     81    8    1700   8
OKANAGAN     KEL       9    3     350   2     64    7    1350   7
CASTLEGAR    SPOK      9    2     500  13      9    4     500  13
CRANBROOK    SPOK      9    1     950  42      9    3     950  25
REVELSTOKE   KEL       9    2     450   2     12    4     600   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  30   SW  67
CRANBROOK             SW  31   SW  80

TODAY'S VENTING: POOR TO FAIR THIS MORNING RISING TO GOOD IN THE KAMLOOPS
AND OKANAGAN REGIONS THIS AFTERNOON.


VENTING FOR SUNDAY: 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.     90    1    1300  41    100    4    1800  30
PR. GEORGE   P.G.     11    2     700  29     11    3     700  29
SMITHERS     P.G.      9    0     500   6      9    1     500   6
WELLS GRAY   P.G.     90    1    1300  40    100    4    2300  30
FT NLSN      F.N.     18  -17     700   3     22  -14     800   3
FT STJOHN    F.N.     78   -8    1150  22     88   -5    1250  24

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   20   SW  30
SMITHERS              S   33   SW  30

TODAY'S VENTING: GOOD THIS MORNING IN WINDY AREAS AT HIGHER ELEVATIONS
OTHERWISE POOR TO FAIR ALL DAY.




VENTING FOR SUNDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    6     100  29     11    7     100  29
FRASER VLY   QUIL     50    7     250  29     81    8     450  29
SRN VRISL    QUIL     15    7     150   5     56    8     350  17
CNTRL VRISL  QUIL     16    7     150   5     57    8     400  17
NRN VRISL    HRDY     14    5     200   3     74    7     900  11
TERRACE      ANT      55    0     700  11     55    0     700  11
STEWART      ANT      30    0     200  15     40    0     500  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   19   SW  28   SW  39
PORT HARDY   S   24   S   31   S   31
SANDSPIT     SW  33   SW  43   SW  52

TODAY'S VENTING: POOR TO FAIR THIS MORNING BECOMING FAIR TO GOOD THIS
AFTERNOON EXCEPT REMAINING POOR COASTAL SITES.




VENTING FOR SUNDAY: FAIR




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


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