FPCN39 CWLW 301401
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 30 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    3     200   3      9    4     200   3
KAMLOOPS     KEL       9    3     350   3     14    5     500   3
OKANAGAN     KEL       9    2     350   3     13    4     500   3
CASTLEGAR    SPOK      9    2     500  12      9    3     500  12
CRANBROOK    SPOK      9   -1     950  16     10    2     950  16
REVELSTOKE   KEL       9    1     450   3      9    2     450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   11   SW  15
CRANBROOK             VR   5   NW  24

TODAY'S VENTING: POOR

VENTING FOR SATURDAY: 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.      9    3     950  10     42    5    1250  12
PR. GEORGE   P.G.      9    2     700   7      9    4     700   7
SMITHERS     P.G.      9    1     500   2     11    4     650   2
WELLS GRAY   P.G.      9    2    1000  10     21    4    1100  12
FT NLSN      F.N.      9  -14     750   0      9  -12     900   0
FT STJOHN    F.N.      9    1    1150   0      9    0    1100   0

*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            SW  26   W   37
SMITHERS              S   35   S   37

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR SATURDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     56    9     300  12     51   10     500  12
FRASER VLY   QUIL      9    8      50  12     35    9     300  12
SRN VRISL    QUIL      9    8       0   3     22   10     500   5
CNTRL VRISL  QUIL      9    8      50   3     15    9     200   5
NRN VRISL    HRDY     19    8     150   9     32   10     300   9
TERRACE      ANT      10    3     200  10     10    3     200  10
STEWART      ANT       9    3       0  10      9    3       0  10

*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    SE  24   S   26   S   26
PORT HARDY   SE  63   S   80   S   80
SANDSPIT     SE 109   S  113   S  104

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR SATURDAY: POOR

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


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