FPCN39 CWLW 041511
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 SUNDAY 4 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   -9     200   0     16   -5     700   1
KAMLOOPS     KEL       9   -8     350   0     15   -6     800   1
OKANAGAN     KEL      27   -5     950   3     33   -3    1200   3
CASTLEGAR    SPOK      9   -2     500  11      9   -1     500  11
CRANBROOK    SPOK      9   -9     950  31      9   -7     950  31
REVELSTOKE   KEL      14   -7     800   1     14   -7     800   1


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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  44
CRANBROOK             SW  20   W   48

TODAY'S VENTING: Poor.


VENTING FOR MONDAY: 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.     36  -19    1150  15     47  -16    1250  15
PR. GEORGE   P.G.     10  -22     700  21     61  -18     900  21
SMITHERS     P.G.     61  -16    1100  12     61  -16    1100  12
WELLS GRAY   P.G.     40  -17    1250  15     42  -16    1250  15
FT NLSN      F.N.      9  -35     400  13     23  -32     500  13
FT STJOHN    F.N.      9  -29     700  12      9  -29     700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  13   SW  19
SMITHERS              SE  35   S   19

TODAY'S VENTING: Fair to good west of the Rockies. Poor east of
the Rockies.

VENTING FOR MONDAY: 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   5      9    3     100   5
FRASER VLY   QUIL      9   -1      50   5      9    1      50   5
SRN VRISL    QUIL      9    2       0   5     23    4     300   5
CNTRL VRISL  QUIL      9    0      50   5      9    2      50   5
NRN VRISL    HRDY      9   -1       0   3     17    1     300   3
TERRACE      ANT       9  -11     200  26      9  -10     200  26
STEWART      ANT       9   -7       0  20      9  -10       0  20


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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   20   SW  31   SW  39
PORT HARDY   S   52   SW  59   SW  59
SANDSPIT     SW   9   S   15   S   24

TODAY'S VENTING: Poor.


VENTING FOR MONDAY: POOR


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


END/GF