FPCN39 CWLW 101431
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 WEDNESDAY 10 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       9   -4     500   0     76    4    2000   5
KAMLOOPS     KEL       9   -3     550   0     69    2    1850   5
OKANAGAN     KEL       9   -3     550   0     68    2    1850   5
CASTLEGAR    SPOK     67   -1    1200  11     80    1    2000   5
CRANBROOK    SPOK     48   -8    1450  15    100   -2    2050   5
REVELSTOKE   KEL       9   -3     600   0     47    0    1350   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   13   W   30   W   44
CRANBROOK             W   15   W   35

TODAY'S VENTING: GOOD.




VENTING FOR THURSDAY: GOOD




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.      9   -8     950  20     70   -3    1500   5
PR. GEORGE   P.G.     13  -13     750   9     38   -6     900   5
SMITHERS     P.G.     27   -9     800   7     33   -5     900   7
WELLS GRAY   P.G.      9   -8     900   3     15   -3    1200   5
FT NLSN      F.N.      9  -24     400   0      9  -19     400   4
FT STJOHN    F.N.     14  -20    1000  15     42  -15    1250   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  26   W   41
SMITHERS              SW  26   SW  41

TODAY'S VENTING: VARIABLE.




VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     74    3     550  20    100    5    1150  25
FRASER VLY   QUIL      9    2      50  12    100    5    1100  25
SRN VRISL    QUIL     83    4     650  19    100    6    1300  23
CNTRL VRISL  QUIL     52    3     350  16    100    7    1800  24
NRN VRISL    HRDY     29    2     500   4     90    4    1400  10
TERRACE      ANT       9   -3     200   6     20   -2    1000  10
STEWART      ANT      10   -3     200   5     15   -2     500   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   30   SW  39   SW  54
PORT HARDY   S   52   S   65   S   67
SANDSPIT     S   52   S   52   S   50

TODAY'S VENTING: GOOD EXCEPT POOR INLAND




VENTING FOR THURSDAY: GOOD




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


END/WJW