FPCN39 CWLW 141505
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 FRIDAY 14 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    0     200   1     31    3    1050   3
KAMLOOPS     KEL       9   -1     350   1     22    0     550   1
OKANAGAN     KEL       9    0     450   1     25    1     950   3
CASTLEGAR    SPOK      9    1     500   4     19    4     750   4
CRANBROOK    SPOK      9   -5    1050   9     17    1     950   9
REVELSTOKE   KEL       9    1    1150   3     29    3    1200   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SE  19   SE  26
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR.

VENTING FOR SATURDAY: 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.     12   -7    1050   3     20   -5    1050   6
PR. GEORGE   P.G.     18   -5    1050   3     29   -4    1050   6
SMITHERS     P.G.     20   -2    1050   3     35    1    1100   5
WELLS GRAY   P.G.     16   -5    1100   6     17   -4    1100   9
FT NLSN      F.N.      9  -10     400   0      9   -4     650   0
FT STJOHN    F.N.      9   -3     800   0      9    2     950   0

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   35   S   31
SMITHERS              S   24   S   31

TODAY'S VENTING: POOR.

VENTING FOR SATURDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    5     100   5     27    9     100   9
FRASER VLY   QUIL     10    7     100   7     40   13     350  13
SRN VRISL    QUIL      9    6       0   6     36   10     200   7
CNTRL VRISL  QUIL      9    4      50   6     22    5      50   6
NRN VRISL    HRDY     14    9     200   3     25   12     400   5
TERRACE      ANT      18    1     200  15     37    4     250  15
STEWART      ANT      12    5      50   1      9    4     150   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   22   SE  28   SE  33
PORT HARDY   SE  46   SE  46   SE  46
SANDSPIT     SE  44   SE  46   SE  48

TODAY'S VENTING: FAIR TO POOR.

VENTING FOR SATURDAY: FAIR TO POOR.

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


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