FPCN39 CWLW 241341
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 TUESDAY 24 MARCH 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    9     550   2     65   12    1400   6
KAMLOOPS     KEL      33    9    1050   4     76   12    1700   7
OKANAGAN     KEL      12    6     500   2     71   11    1550   7
CASTLEGAR    SPOK     19    7     750   4     92   11    1500  15
CRANBROOK    SPOK     10    4     950  19     98    9    1800  20
REVELSTOKE   KEL      12    7     600   2     56    9    1350   5

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PENTICTON    VR   5   SW  20   SW  39
CRANBROOK             SW  15   SW  39


TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: 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    6    1950  22    100    9    2800  22
PR. GEORGE   P.G.     70    6    1300  14    100    9    2100  18
SMITHERS     P.G.      9    3     500   3     59    7    1150   4
WELLS GRAY   P.G.    100    6    2100  22    100   10    4000  22
FT NLSN      F.N.      9    0     400  10     57    7     750  13
FT STJOHN    F.N.      9    1     700  19     58    6    1050  19

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
PR. GEORGE            W   31   W   43
SMITHERS              W   20   W   43

TODAY'S VENTING: GOOD


VENTING FOR WEDNESDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     33   10     400   8     83   12    1200  10
FRASER VLY   QUIL     71   11    1000  10     79   12    1200  10
SRN VRISL    QUIL     17   10     300   3     71   12    1100   8
CNTRL VRISL  QUIL     24   10     300   6     72   12    1100   8
NRN VRISL    HRDY      9    8       0   8     63   10     800   9
TERRACE      ANT      55    7     550  18     79   10    1000  14
STEWART      ANT      51    8     450  12     67   10     650  13

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900M     1800M    2700M
VANCOUVER    SW  13   SW  20   SW  28
PORT HARDY   W   17   W   19   W   20
SANDSPIT     W   26   W   22   W   19



TODAY'S VENTING: GOOD


VENTING FOR WEDNESDAY: GOOD




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


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