FPCN39 CWLW 061338
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 SATURDAY 6 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   -1     200   3     39    2     850   5
KAMLOOPS     KEL      29    0     750   5     53    2    1250   6
OKANAGAN     KEL      12   -1     450   3     51    3    1350   5
CASTLEGAR    SPOK     11    0     950   3     44    1    1000   8
CRANBROOK    SPOK      9   -8     950  12      9   -6     950  10
REVELSTOKE   KEL       9   -3     450   3      9   -2     450   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SE  15   S   20
CRANBROOK             VR   5   SW  13

TODAY'S VENTING: Fair.

VENTING FOR SUNDAY: Fair.

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   -8     950  12     10   -4     950  12
PR. GEORGE   P.G.     13   -8     800   3     14   -6     850   3
SMITHERS     P.G.     21   -3     950   3     16   -4     900   2
WELLS GRAY   P.G.      9   -5    1000  12      9   -4    1000  12
FT NLSN      F.N.      9  -16     400   3     14  -13     550   3
FT STJOHN    F.N.      9   -8     700   2     11   -4     800   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   19   SW  15
SMITHERS              S   35   S   15

TODAY'S VENTING: Poor.

VENTING FOR SUNDAY: Poor.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    0     100   6      9    0     100   6
FRASER VLY   QUIL      9    0      50   3      9    0      50   3
SRN VRISL    QUIL     11    1      50   3     10    0      50   3
CNTRL VRISL  QUIL     10    1      50   3     10    0      50   3
NRN VRISL    HRDY      9    0       0   1      9    0       0   1
TERRACE      ANT      10    0     200  28     10    0     200  28
STEWART      ANT       9    0       0  11      9    0       0  11

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  24   SE  24   SE  20
PORT HARDY   SE  43   S   43   S   43
SANDSPIT     S   57   S   61   S   65

TODAY'S VENTING: Poor.

VENTING FOR SUNDAY: Poor.

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


END/DB