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2
FPCN39 CWLW 021541
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 THURSDAY 2 JANUARY 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      15    6     450   2     37   10     800   1
KAMLOOPS     KEL      12    5     500  12     34    8     700  12
OKANAGAN     KEL      12    5     500  10     34    8     700  10
CASTLEGAR    SPOK      9    4     500   4     23    7     850   4
CRANBROOK    SPOK     30    5    1000  10     34    6    1200  10
REVELSTOKE   KEL       9    2     450   2     35    3     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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   SW  22   SW  59
CRANBROOK             W   22   W   57

TODAY'S VENTING:  FAIR.

VENTING FOR FRIDAY: POOR TO 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.     30    4    1100  15     46    0    1100  18
PR. GEORGE   P.G.      9   -8     700   0     32   -6     950   9
SMITHERS     P.G.      9  -12     550   0     29  -12     550   0
WELLS GRAY   P.G.      9   -7    1000  27     29   -5    1000  27
FT NLSN      F.N.      9  -30     400   5      9  -28     400   5
FT STJOHN    F.N.      9  -25     700  13     10  -23     700  13

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  52   W   65
SMITHERS              SW  35   SW  65

TODAY'S VENTING: FAIR EXCEPT POOR IN THE NORTH.

VENTING FOR FRIDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     20   10     850  15    100   11    1100  16
FRASER VLY   QUIL     11    8      50  16     11    8      50  16
SRN VRISL    QUIL     20   10     700  10    100   11     950  11
CNTRL VRISL  QUIL      9    4     200   5      9    7      50   5
NRN VRISL    HRDY     19    7     100  12     34    8     250  12
TERRACE      ANT       9   -7     200  10      9   -7     200  10
STEWART      ANT      48    0     450  11      9   -7       0  12

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   39   SW  50   SW  52
PORT HARDY   W   24   W   31   W   41
SANDSPIT     W   26   W   31   W   33

TODAY'S VENTING: POOR EXCEPT GOOD NEAR GEORGIA STRAIT.

VENTING FOR FRIDAY: POOR


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

END/MWSO


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