FPCN39 CWLW 071339
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 SUNDAY 7 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       9   -2     200   3     33    1     700   5
KAMLOOPS     KEL      30    0     950   3     45    1    1200   5
OKANAGAN     KEL      30    0     950   3     57    3    1350   5
CASTLEGAR    SPOK     35    0     850   3     21    1     900   3
CRANBROOK    SPOK      9   -9     950  10      9   -7     950  10
REVELSTOKE   KEL       9   -3     450   5     30   -1     950   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   11   S   24
CRANBROOK             VR   5   S   15

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: 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.      9   -7     950  13      9   -3     950  13
PR. GEORGE   P.G.     22   -8     850   9     25   -6     900   9
SMITHERS     P.G.     32   -4     900   7     34   -2     900   7
WELLS GRAY   P.G.      9   -5    1000  13      9   -3    1000  13
FT NLSN      F.N.      9  -17     400   8     24  -15     600   8
FT STJOHN    F.N.      9  -11     700   3     11   -8     750   3

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   44   S   43
SMITHERS              SE  30   S   43

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR MONDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    4     100  26      9    7     100  26
FRASER VLY   QUIL      9    4      50  26      9    6      50  26
SRN VRISL    QUIL     15    5     100   6     21    8     200   6
CNTRL VRISL  QUIL     13    4     100   6     15    5     100   6
NRN VRISL    HRDY     43    7     400  10     46    8     450  10
TERRACE      ANT       9    0     200  15      9    3     200  33
STEWART      ANT       9    4       0  16      9    3       0  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  37   S   48   S   56
PORT HARDY   S   46   S   41   S   19
SANDSPIT     NW  30   W   15   S   26

TODAY'S VENTING: POOR.

VENTING FOR MONDAY: POOR

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


END/