FPCN39 CWLW 031339
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 3 DECEMBER 1997 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      12    0     500   1     16    5     850   1
KAMLOOPS     KEL      11    1     600   1     16    5    1100   1
OKANAGAN     KEL      11   -1     500   1     15    4     950   1
CASTLEGAR    KEL      11    3     700   1     15    5    1100   1
CRANBROOK    KEL       9   -3     950   1      9   -2     950   1
REVELSTOKE   KEL      10    0     600   1     10    0     600   1

*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    VR   5   S   19   S   26
CRANBROOK             VR   5   NW  22

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: 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  17      9    0     950  17
PR. GEORGE   P.G.      9   -5     700  10     24   -2     850  10
SMITHERS     P.G.     12   -3     650   3     25    0     850   5
WELLS GRAY   P.G.      9   -3    1000  17     32    1    1150  17
FT NLSN      F.N.      9  -12     400   6      9   -8     400   6
FT STJOHN    F.N.      9   -4     700  10      9   -2     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   24   S   17
SMITHERS              S   41   S   17

TODAY'S VENTING: POOR

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     14    7     150   9     22   12     250   9
FRASER VLY   QUIL     16    7     150   9     23   12     250   9
SRN VRISL    QUIL     18    7     150   8     24   12     200   8
CNTRL VRISL  QUIL      9    5      50   7     18    8     150   8
NRN VRISL    HRDY     57   10     400  16     63   12     450  16
TERRACE      HRDY      9    3     200  15     17    5     270  15
STEWART      HRDY      9    3       0  18     33    5     150  18

*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   SE  31   S   37
PORT HARDY   SE  50   S   50   S   54
SANDSPIT     SW  30   S   44   S   72

TODAY'S VENTING: POOR

VENTING FOR THURSDAY: POOR

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


END/MWSO