FPCN39 CWLW 241426
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 24 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      15    7     500   2     17    8     600   2
KAMLOOPS     KEL      11    4     450   2     12    6     500   2
OKANAGAN     KEL       9    2     350   2     12    5     500   2
CASTLEGAR    SPOK      9    3     500  12     37    4     750  12
CRANBROOK    SPOK      9    2     950   7      9    2     950   7
REVELSTOKE   KEL       9    2     450   2      9    3     450   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    S   13   SW  30   SW  69
CRANBROOK             SW  19   SW  56

TODAY'S VENTING: POOR.

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.     44    3    1050  44     60    4    1100  44
PR. GEORGE   P.G.     10    3     700  35     10    4     700  35
SMITHERS     P.G.      9    0     500  14      9    0     500  14
WELLS GRAY   P.G.     10    5    1000  44     10    5    1000  44
FT NLSN      F.N.     41  -19     900   7     42  -18     900   7
FT STJOHN    F.N.     60  -13    1300  11     61  -12    1350  11

*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   43   S   35
SMITHERS              S   20   SW  35

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR SUNDAY: POOR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    9     100  44    100   11    1150  46
FRASER VLY   QUIL     12    9      50  44     92   10    1050  44
SRN VRISL    QUIL      9    9       0  15    100   11    1050  40
CNTRL VRISL  QUIL      9    8      50  15     69    9     850  15
NRN VRISL    HRDY      9    7       0  10     26    8     200  10
TERRACE      ANT       9    1     200  29      9    2     200  29
STEWART      ANT       9    4       0  15      9    2       0  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  43   SW  59   SW  65
PORT HARDY   SW  52   SW  59   SW  61
SANDSPIT     S   44   S   46   S   46

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

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


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