FPCN39 CWLW 071405
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 7 DECEMBER 1998 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      78    4    1250  10    100    5    3300  25
KAMLOOPS     KEL      72    3    1300  10    100    5    3350  15
OKANAGAN     KEL      13    0     550   2    100    1    3350  15
CASTLEGAR    SPOK      9    0     500   8     82    2    3350  12
CRANBROOK    SPOK     75   -1    1300  16     75   -1    3300  12
REVELSTOKE   KEL      57    1    1200   8     88    2    3350  15

*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    S   11   SW  26   SW  69
CRANBROOK             SW  26   SW  76

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR TO 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   -1     950  22    100    1     950  152
PR. GEORGE   P.G.     10    0     700  15    100   -1     700  15
SMITHERS     P.G.      9   -1     500   8    100    0     550   8
WELLS GRAY   P.G.     22   -3     500  15    100    1    1000  22
FT NLSN      F.N.      9  -19     400   0     10  -18     400   0
FT STJOHN    F.N.      9   -6     700  12     61   -5     950  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   SW  41
SMITHERS              S   46   SW  41

TODAY'S VENTING: GOOD EXCEPT FAIR AT FORT NELSON.

VENTING FOR TUESDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100  21    100    8    3350  21
FRASER VLY   QUIL      9    6      50  21    100    9    3300  21
SRN VRISL    QUIL     70    8     300  29    100    9    3300  21
CNTRL VRISL  QUIL     28    7     150  19    100    8    3350  21
NRN VRISL    HRDY     81    6     500  24    100    8    3350  21
TERRACE      ANT       9    0     200  22    100    2    3300  21
STEWART      ANT       9    0     200  22    100    2    3330  21

*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    W   28   W   43   W   50
PORT HARDY   SW  43   SW  56   SW  56
SANDSPIT     SW  57   SW  63   SW  65

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: FAIR TO GOOD.




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


END/JMS