FPCN39 CWLW 251434
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 25 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      16    7     550   2     34    8     650   6
KAMLOOPS     KEL      12    4     500   2     14    6     600   2
OKANAGAN     KEL       9    1     350   2     14    6     600   2
CASTLEGAR    SPOK      9    3     500   7     35    4     900   8
CRANBROOK    SPOK      9    0     950  14      9    3     950  14
REVELSTOKE   KEL      10    2     450   2     10    3     500   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   S   30   SW  54
CRANBROOK             SW  13   W   43

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR MONDAY: 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    2     950  25     10    4     950  25
PR. GEORGE   P.G.     10    3     700  21     10    5     700  21
SMITHERS     P.G.      9    1     500  15      9    0     500  15
WELLS GRAY   P.G.      9    2    1000  25     10    5    1000  25
FT NLSN      F.N.      9  -21     400   5     18  -18     550   5
FT STJOHN    F.N.     21  -10     900   6     24   -6     950   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   54   S   63
SMITHERS              SE  44   S   63

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     25    8     300   8     63    9     500  18
FRASER VLY   QUIL      9    7      50   8     24    8     250   8
SRN VRISL    QUIL     48    9     350  13     62   10     550  13
CNTRL VRISL  QUIL      9    6      50   4      9    6      50   4
NRN VRISL    HRDY     19    7     100  12     31    8     200  12
TERRACE      ANT       9    3     200  30     10    4     200  30
STEWART      ANT       9    5       0  16      9    4       0  16

*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    SE  70   S   85   S   87
PORT HARDY   SE  94   S  100   S   93
SANDSPIT     SE 115   SE 102   S   91

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: GOOD.

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


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