FPCN39 CWLW 281353
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 WEDNESDAY 28 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     500   2     31    5    1400   2
KAMLOOPS     KEL      13    2     550   2     33    5    1400   3
OKANAGAN     KEL      12    0     500   2     28    3    1400   2
CASTLEGAR    KEL       9    2     500   6     28    3    1370   2
CRANBROOK    KEL       9   -2     950   6     29    3    1600   4
REVELSTOKE   KEL      11    1     550   2     13    2     650   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE   9   S   22   SW  46
CRANBROOK             SW   9   SW  30

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: 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.     10    0     950  28    100    2    1500  33
PR. GEORGE   P.G.     20   -1     800   9     51    2    1050  14
SMITHERS     P.G.     20    0     750   5     20    0     750   5
WELLS GRAY   P.G.     10   -1    1000   8     60    3    1700  15
FT NLSN      F.N.      9  -17     400  10     33  -12     650  10
FT STJOHN    F.N.     22   -3     900   6     23   -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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   48   S   35
SMITHERS              S   37   S   35

TODAY'S VENTING: GOOD SOUTH. POOR NORTH.

VENTING FOR THURSDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100  44     10   10     100  44
FRASER VLY   QUIL      9    7      50   9      9    9      50   9
SRN VRISL    QUIL      9    8       0   8      9   10       0   8
CNTRL VRISL  QUIL      9    8      50   8      9   10      50   8
NRN VRISL    HRDY    100    8     600  32    100    9     650  37
TERRACE      ANT      10    3     200  26     10    4     200  26
STEWART      ANT       9    5       0  20      9    4       0  20

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   52   S   63   S   59
PORT HARDY   SE  43   S   48   S   56
SANDSPIT     S   43   S   48   S   54

TODAY'S VENTING: POOR EXCEPT GOOD OUTER COAST.

VENTING FOR THURSDAY: FAIR SOUTH. POOR NORTH.


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


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