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2
FPCN39 CWLW 211530
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PST SATURDAY 21 DECEMBER 1996 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      15   -3     500   2     17   -2     550   2
KAMLOOPS     KEL      12   -5     500   2     13   -4     500   2
OKANAGAN     KEL       9   -6     350   2      9   -6     350   2
CASTLEGAR    SPOK      9   -3     500   0      9   -3     500   0
CRANBROOK    SPOK      9  -10     950  12      9  -10     950  12
REVELSTOKE   KEL      10   -6     500   2     10   -6     500   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
PENTICTON    E    9   S   19   S   46
CRANBROOK             S    9   S   31

TODAY'S VENTING: POOR.

VENTING FOR SUNDAY: 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.     11  -19     950  23     11  -19     950  23
PR. GEORGE   P.G.     26  -19     850  11     45  -18     950  15
SMITHERS     P.G.     71  -15    1100  15     41  -15    1100  15
WELLS GRAY   P.G.     11  -17    1000  23     11  -17    1000  23
FT NLSN      F.N.      9  -23     400   9     27  -22     600   9
FT STJOHN    F.N.      9  -27     700  31     43  -24     900  31

*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            E   31   S   22
SMITHERS              E   41   E   22

TODAY'S VENTING: POOR TO FAIR.

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     10    3     100  21     10    3     100  21
FRASER VLY   QUIL     10    1      50  21     10    2      50  21
SRN VRISL    QUIL     22    5     450   3     32    6     450  12
CNTRL VRISL  QUIL      9    1      50   3      9    2      50   3
NRN VRISL    HRDY     28    4     350   7     28    4     350   7
TERRACE      ANT       9  -11     200  26      9  -12     200  26
STEWART      ANT       9   -4       0  10      9  -12       0  10

*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  22   SE  19   S   17
PORT HARDY   E   19   E    9   VR   5
SANDSPIT     NE  26   NE  19   N    9

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/PLJ


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