FPCN39 CWLW 081425
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 8 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    0     200   2     16    2     500   2
KAMLOOPS     KEL       9   -1     350   2     16    1     700   2
OKANAGAN     KEL       9    0     350   2     16    1     700   2
CASTLEGAR    SPOK     27    0     750   8     35    1    1000   6
CRANBROOK    SPOK      9   -7     950   3      9   -5     950   3
REVELSTOKE   KEL       9   -2     450   2      9   -1     450   2

*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    W    9   W   22   W   43
CRANBROOK             NW  13   NW  35

TODAY'S VENTING: POOR.

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   -3     950  22      9   -2     950  22
PR. GEORGE   P.G.     32   -8     850  18     36   -7     850  18
SMITHERS     P.G.     26   -4     900   5     27   -2     900   5
WELLS GRAY   P.G.      9   -5    1000  22      9   -3    1000  22
FT NLSN      F.N.     ##   ##     ###  ##     ##   ##     ###  ##
FT STJOHN    P.G.      9  -11     700  18     31   -8     850  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  30   SW  39
SMITHERS              W   41   W   39

TODAY'S VENTING: POOR TO FAIR.

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     74    8     600  18    100    9    1200  19
FRASER VLY   QUIL      9    7      50  18     66    8     500  18
SRN VRISL    QUIL      9    6     150   0    100   10    1350  16
CNTRL VRISL  QUIL      9    7     150   0     69    7     450  15
NRN VRISL    HRDY     32    5     200  16     79    7     600  18
TERRACE      ANT       9    0     200   4      9    1     200   4
STEWART      ANT       9    2       0   2      9    1       0   2

*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    W   30   W   35   W   33
PORT HARDY   W   35   W   39   W   39
SANDSPIT     W   28   W   30   W   35

TODAY'S VENTING: GOOD.

VENTING FOR TUESDAY: FAIR.

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


END/DB