FPCN39 CWLW 231432
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 MONDAY 23 FEBRUARY 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      19    3     500   3     51    7    1200   5
KAMLOOPS     KEL      14    2     500   3     64    8    1800   5
OKANAGAN     KEL      14    1     500   3     49    7    1300   5
CASTLEGAR    KEL      25    4    1050   3     51    7    1500   5
CRANBROOK    KEL      28    1    1600   3     46    4    1800   5
REVELSTOKE   KEL      12    2     550   3     21    4     850   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S    9   S   15
CRANBROOK             VR   5   SW  11

TODAY'S VENTING: FAIR LOCALLY GOOD

VENTING FOR TUESDAY: 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   -1     950   7     68    4    1950   8
PR. GEORGE   P.G.     12    0     750   7     75    4    1900   8
SMITHERS     P.G.      9    0     650   7     42    4    1000   8
WELLS GRAY   P.G.     10    0    1000   7     63    3    1900   8
FT NLSN      F.N.      9  -14     400   5      9   -7     400   5
FT STJOHN    F.N.      9   -1     700  15     25    2     800  16

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   11   W   11
SMITHERS              SW  15   SW  11

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR IN THE PEACE

VENTING FOR TUESDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     18    5     250   5     80    8    1400   9
FRASER VLY   QUIL     18    5     250   5     84    9    1400   9
SRN VRISL    QUIL     18    5     250   5     80    9    1400   8
CNTRL VRISL  QUIL     18    5     250   5     57    7     900   7
NRN VRISL    HRDY      9    4       0   3     62    7     900   8
TERRACE      ANT       9    3     200   6     49    6     900   7
STEWART      ANT       9    3       0   1     47    6     900   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     S   43   S   39   SW  35

TODAY'S VENTING: GOOD SOUTH TO FAIR NORTH

VENTING FOR TUESDAY: FAIR TO POOR

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


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