FPCN39 CWLW 131436
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 13 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      50    7     700  12     70    8     750  20
KAMLOOPS     KEL      12    1     500   2     45    5     750  12
OKANAGAN     KEL      12    0     500   2     22    4     650   5
CASTLEGAR    SPOK      9    1     500   4     45    3     900  12
CRANBROOK    SPOK      9    0     950   5     45    3    1250  13
REVELSTOKE   KEL      10    0     500   2     11    2     550   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    S   11   S   30   SW  61
CRANBROOK             W   17   W   54

TODAY'S VENTING: POOR EXCEPT FAIR IN FRASER CANYON BECOMING
POOR TO FAIR EXCEPT GOOD IN THE FRASER CANYON THIS AFTERNOON




VENTING FOR THURSDAY: 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.      9    0     950   8     50    4    1600  15
PR. GEORGE   P.G.      9    0     700  17     66    3    1100  19
SMITHERS     P.G.     12   -1     600   3     49    3     950  11
WELLS GRAY   P.G.      9   -4     950   4     50    4    1600  15
FT NLSN      F.N.      9  -17     400   1     15  -12     400   6
FT STJOHN    F.N.      9    0     700  13      9    2     900  13

*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            S   80   SW  94
SMITHERS              S   65   SW  94

TODAY'S VENTING: POOR RISING TO FAIR THIS AFTERNOON EXCEPT POOR IN
FORT NELSON AND FORT ST JOHN




VENTING FOR THURSDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     24    7     300   8     60    9     650  12
FRASER VLY   QUIL     23    7     250   8     55    9     600  11
SRN VRISL    QUIL     34    8     350   8     46    9     550   8
CNTRL VRISL  QUIL     16    7     200   4     46    9     550   8
NRN VRISL    HRDY     51    7     500  10    100    9    2500  25
TERRACE      ANT      11    2     200   5    100    3    3000  34
STEWART      ANT      9     2       0   4    100    3    3000  18

*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   50   S   72   SW  78
PORT HARDY   S   89   S  113   SW 113
SANDSPIT     SW  59   SW  82   SW 107

TODAY'S VENTING: POOR TO FAIR RISING TO FAIR TO GOOD THIS AFTERNOON




VENTING FOR THURSDAY: POOR




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


END/WJW