FPCN39 CWLW 031447
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 3 JANUARY 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       9  -11     200   0     11   -8     850   0
KAMLOOPS     KEL       9  -11     350   0     38   -8    1400   3
OKANAGAN     KEL      17   -9    1200   1     40   -6    1500   3
CASTLEGAR    SPOK      9   -4     500   8      9   -3     500   8
CRANBROOK    SPOK      9  -11     950  10      9   -9     950  10
REVELSTOKE   KEL      37   -8    1500   3     38   -6    1500   3


*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   SW  19   SW  41
CRANBROOK             SW  19   W   48

TODAY'S VENTING: Poor.



VENTING FOR SUNDAY: Poor.




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.     18  -22    1050  10     40  -18    1300  10
PR. GEORGE   P.G.     21  -23     900   6     26  -20    1000   6
SMITHERS     P.G.     27  -18    1050   4     32  -15    1200   4
WELLS GRAY   P.G.      9  -22    1000  10     33  -19    1250  10
FT NLSN      F.N.      9  -35     400  11      9  -32     400  11
FT STJOHN    F.N.      9  -30     700   6     14  -28     750   6


*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            S   19   S   19
SMITHERS              SE  13   SW  19

TODAY'S VENTING: Poor.



VENTING FOR SUNDAY: Poor.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    1     100  26     86    4     550  26
FRASER VLY   QUIL      9    0      50  26     81    4     500  26
SRN VRISL    QUIL     15    2     100   6     53    4     350  16
CNTRL VRISL  QUIL      9    0      50   6     15    2     150   6
NRN VRISL    HRDY     10    1      50  13     76    3     750  14
TERRACE      ANT       9  -11     200   7     60   -8    1200  12
STEWART      ANT      20   -4     250   5      9   -8     100   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   24   SE  26   S   30
PORT HARDY   E    9   VR   5   NW  11
SANDSPIT     W    9   W   22   W   20

TODAY'S VENTING: Good in the south and in areas affected by outflow
winds. Poor elsewhere.


VENTING FOR SUNDAY: FAIR


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


END/GF