FPCN39 CWLW 251344
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 25 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       9   -5     200   0      9   -4     200   0
KAMLOOPS     KEL       9   -5     350   0      9   -4     450   0
OKANAGAN     KEL      11   -3     750   1     40   -2    1050   5
CASTLEGAR    SPOK     25   -2     750   6     25   -2     750   6
CRANBROOK    SPOK      9   -8     950  11      9   -6     950  11
REVELSTOKE   KEL      36   -3    1050   5     52   -2    1350   6

*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    SE   9   S   13   SW  31
CRANBROOK             SW  11   W   39

TODAY'S VENTING: poor to fair.

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.     49   -7    1150  22     54   -6    1200  22
PR. GEORGE   P.G.     54   -6    1100  14     54   -5    1150  14
SMITHERS     P.G.      9   -9     500   0      9   -7     500   0
WELLS GRAY   P.G.     43   -9    1200  22     43   -7    1200  22
FT NLSN      F.N.      9  -20     400   0      9  -16     400   0
FT STJOHN    F.N.      9   -7     700  23      9   -6     700  23

*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  26   SW  30
SMITHERS              NW  24   NW  30

TODAY'S VENTING: fair to poor.

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      9    3     100   8      9    3     100   8
FRASER VLY   QUIL      9    1      50   8      9    2      50   8
SRN VRISL    QUIL     13    5     150   3     13    5     150   3
CNTRL VRISL  QUIL     11    4     100   3     11    4     100   3
NRN VRISL    HRDY     40    4     300  13     40    4     300  13
TERRACE      ANT       9   -6     200  32      9   -5     200  32
STEWART      ANT       9   -8       0  32      9   -5       0  32

*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    S   37   S   44   SW  39
PORT HARDY   N   65   N   63   NW  43
SANDSPIT     NW  54   NW  61   NW  57

TODAY'S VENTING: poor.

VENTING FOR TUESDAY: poor.


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


END/dsl