FPCN39 CWLW 091347
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 SATURDAY 9 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      17    6     600  12     45    7     850  18
KAMLOOPS     KEL      12    2     450   2     29    5     650   4
OKANAGAN     KEL      12    2     450   2     29    5     650   4
CASTLEGAR    SPOK      9    2     750   0      9    3     800   0
CRANBROOK    SPOK      9   -3     950   7      9    0     950   7
REVELSTOKE   KEL      10    1     450   2     11    2     550   2

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   19   W   43
CRANBROOK             W   17   NW  56

TODAY'S VENTING: POOR TO FAIR

VENTING FOR SUNDAY: 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     40    3    1450   8
PR. GEORGE   P.G.      9   -2     700   8     19    0     800   8
SMITHERS     P.G.     11   -7     600   2     12   -4     650   2
WELLS GRAY   P.G.     11   -7     600   2     15    0    1600  10
FT NLSN      F.N.      9  -25     400   6      9  -25     400   6
FT STJOHN    F.N.     58  -23    1300  11     54  -23    1300  14

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   44   W   61
SMITHERS              SW  43   W   61

TODAY'S VENTING: POOR TO FAIR.


VENTING FOR SUNDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     38    7     450   9     44    8     650  10
FRASER VLY   QUIL     36    7     400   9     40    8     600  10
SRN VRISL    QUIL     25    7     300   6     44    9     750   9
CNTRL VRISL  QUIL     26    7     350   6     44    8     550   9
NRN VRISL    HRDY     39    7     450  16     50    9     650  14
TERRACE      ANT       9    2     250   8     40    4     550   8
STEWART      ANT       9    2     250   8     44    4     550   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   20   SW  28   W   48
PORT HARDY   S   48   SW  46   W   50
SANDSPIT     SW  33   SW  37   W   46

TODAY'S VENTING: FAIR.

VENTING FOR SUNDAY: FAIR TO GOOD.




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


END/JMS