FPCN39 CWLW 241441
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 24 MARCH 1999 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   SPOK      9    8     200   5     44   14     900   6
KAMLOOPS     SPOK     32    9     800   6     55   15    1050   8
OKANAGAN     SPOK     32    9     800   6     60   14     950   8
CASTLEGAR    SPOK     26    8     800   6     49   14    1050   8
CRANBROOK    SPOK      9    8     950  19    100   15    3950  18
REVELSTOKE   SPOK      9    4     450   5     31   10     850   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
PENTICTON    S    9   S   26   S   56
CRANBROOK             S   15   S   37

TODAY'S VENTING: GOOD IN THE AFTERNOON




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    7     950  22    100   10    2300  34
PR. GEORGE   P.G.      9    5     700  12     81   10    1350  17
SMITHERS     P.G.     10    3     650  10     43    8     850   5
WELLS GRAY   P.G.     10    5     900  12    100   10    2550  34
FT NLSN      F.N.      9    3     400   4     60   11    1150   9
FT STJOHN    F.N.     10    3     700  10     10    7     700  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   35   S   52
SMITHERS              SE  24   S   52

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE BULKLEY VALLEY AND POOR
                 OVER THE NORTHEAST




VENTING FOR THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     94   10    1350  12    100   11    1500  13
FRASER VLY   QUIL     80    9    1150  10     98   11    1500  12
SRN VRISL    QUIL     76    9    1100  10     99   12    1550  11
CNTRL VRISL  QUIL     76    9    1100  10     95   11    1450  11
NRN VRISL    HRDY      9    6     300   0    100   10    1550  15
TERRACE      ANT      91    5     900  22    100    7    1300  24
STEWART      ANT      ##   ##     ###  ##    100    7     850  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    SE  28   S   37   S   46
PORT HARDY   S   63   S   82   S   85
SANDSPIT     SE  69   SE  70   SE  56

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: FAIR




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


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