FPCN39 CWLW 171539
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 17 NOVEMBER 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   1     13    2     550   1
KAMLOOPS     KEL      11    1     600   1     15    3     800   1
OKANAGAN     KEL      11    1     600   1     15    3     800   1
CASTLEGAR    SPOK      9    1     500   3      9    2     500   3
CRANBROOK    SPOK      9   -4     950   5      9   -2     950   5
REVELSTOKE   KEL      10    0     600   1     12    1     700   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   20   W   46
CRANBROOK             W   11   W   39

TODAY'S VENTING: POOR.

VENTING FOR TUESDAY: 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.     38   -8    1250  10     41   -5    1300  10
PR. GEORGE   P.G.     35   -6    1250   5     36   -4    1300   5
SMITHERS     P.G.     38   -3    1300   4     38   -2    1300   4
WELLS GRAY   P.G.     36   -6    1300  10     36   -6    1300  10
FT NLSN      F.N.      9  -15     400   5      9  -20     400   5
FT STJOHN    F.N.     17   -8     850   5     17   -8     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
PR. GEORGE            S   20   SW  20
SMITHERS              S   19   S   20

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR TUESDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     14    8     250   3     47   10     550  10
FRASER VLY   QUIL      9    7      50   3     35    9     350  10
SRN VRISL    QUIL     11    8     150   2     34   10     450   6
CNTRL VRISL  QUIL      9    6      50   0     11    8     150   2
NRN VRISL    HRDY      9    9       0   2     15   11     450   2
TERRACE      ANT       9    0     200   9      9    1     200   9
STEWART      ANT      10    4      50   3      9    1       0   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  30   SW  35   W   39
PORT HARDY   SW  31   SW  37   SW  39
SANDSPIT     S   20   S   20   S   20

TODAY'S VENTING: POOR TO FAIR.

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