FPCN39 CWLW 291357
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 THURSDAY 29 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    2     550   2     19    5     700   2
KAMLOOPS     KEL      15    3     650   2     21    6     900   2
OKANAGAN     KEL      13    1     550   2     20    5     800   2
CASTLEGAR    SPOK     27    3     750   7     32    5     850   7
CRANBROOK    SPOK      9   -2     950   9      9    1     950   9
REVELSTOKE   KEL      12    1     600   2     17    4     800   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  41
CRANBROOK             SW  17   SW  46

TODAY'S VENTING: POOR

VENTING FOR FRIDAY: 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    4     950  20     45    5    1150  20
PR. GEORGE   P.G.      9    2     700  13      9    3     700  13
SMITHERS     P.G.      9    0     500   1      9    0     500   1
WELLS GRAY   P.G.      9    1    1000  20     36    4    1150  20
FT NLSN      F.N.     18  -16     700   3     19  -14     750   3
FT STJOHN    F.N.     21   -4     900   6     22   -2     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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   50   SW  54
SMITHERS              S   61   S   54

TODAY'S VENTING: POOR LOCALLY FAIR.

VENTING FOR FRIDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100  43      9   11     100  43
FRASER VLY   QUIL      9    8      50  43      9    9      50  43
SRN VRISL    QUIL      9    8       0  13      9   10       0  13
CNTRL VRISL  QUIL      9    8      50  13      9    8      50  13
NRN VRISL    HRDY     10    9       0  22     10    9       0  22
TERRACE      ANT       9    2     200  15      9    3     200  15
STEWART      ANT       9    6       0   3      9    3       0   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   28   SW  37   SW  43
PORT HARDY   S   43   S   48   SW  54
SANDSPIT     SW  70   SW  70   SW  67

TODAY'S VENTING: POOR

VENTING FOR FRIDAY: POOR


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


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