FPCN39 CWLW 231400
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 FRIDAY 23 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      18    3     600   2     53    7    1200   5
KAMLOOPS     KEL      30    3     900   4     60    6    1250   7
OKANAGAN     KEL      13    1     550   2     42    4    1050   5
CASTLEGAR    SPOK     22    2     750   5     26    4     850   5
CRANBROOK    SPOK      9   -3     950   9     15   -1     975   9
REVELSTOKE   KEL      18    1     750   3     26    2     900   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  33   W   89
CRANBROOK             SW  28   SW  78

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SATURDAY: GOOD.

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.    100    1    1700  27    100    2    1950  33
PR. GEORGE   P.G.     49    0    1100  12     76    1    1250  19
SMITHERS     P.G.      9   -2     500   2     30    0     850  10
WELLS GRAY   P.G.    100    1    1850  33    100    1    1850  33
FT NLSN      F.N.     46  -19     750  12     51  -18     800  12
FT STJOHN    F.N.     43  -16    1050  11     46  -15    1100  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   33   S   26
SMITHERS              SE  26   S   26

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR SATURDAY: GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  52     90    8     500  25
FRASER VLY   QUIL      9    6      50  52     85    8     450  25
SRN VRISL    QUIL      9    8       0  17     75    9     300  17
CNTRL VRISL  QUIL      9    6      50  17     70    5      50  17
NRN VRISL    HRDY     89    7     400  36     93    8     450  36
TERRACE      ANT       9    0     200  33      9    0     200  33
STEWART      ANT       9    3       0  12      9    0       0  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  59   SW  83   SW  89
PORT HARDY   S   31   S   35   S   31
SANDSPIT     S   22   S   26   S   30

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.

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


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