FPCN39 CWLW 311359
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 31 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    1     200   1     59    3     450  15
KAMLOOPS     KEL      11    2     550   1     54    4     750   9
OKANAGAN     KEL      21    3     650   4     54    6     950   9
CASTLEGAR    SPOK      9    2     500   4     39    4     750   4
CRANBROOK    SPOK      9    0     950  28     45    3     950   5
REVELSTOKE   KEL      10    1     550   1     34    3     750   5

*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    W   11   W   24   W   46
CRANBROOK             W   17   W   48

TODAY'S VENTING: FAIR TO GOOD

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.     45   -2    1250  15     60    0    1700  15
PR. GEORGE   P.G.      9   -7     700   8     46   -4     700  10
SMITHERS     P.G.     23   -4     750   7     51   -1     900   7
WELLS GRAY   P.G.     23   -4     750  15     80    0    1800  20
FT NLSN      F.N.      9  -26     400   1      9  -25     400   1
FT STJOHN    F.N.     46  -20    1200   9     27  -19    1200   9

*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   SW  65
SMITHERS              SW  48   SW  65

TODAY'S VENTING: POOR TO GOOD

VENTING FOR MONDAY:  POOR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     68    5    2222  16    100    5    2222  16
SRN VRISL    QUIL     59    3    2222  15    100    6    2222  15
CNTRL VRISL  QUIL     66    5    2222  15    100    6    2222  15
NRN VRISL    HRDY     67    2    2222  15    100    3    2222  15
TERRACE      ANT      60   -2    2222  15    100   -1    2222  15
STEWART      ANT      66    0    2222  15    100   -1    2222  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  39   SW  54   W   56
PORT HARDY   SW  54   SW  67   W   69
SANDSPIT     SW  63   W   80   W   85

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: FAIR TO GOOD




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


END/JMS