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2
FPCN39 CWLW 111531
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 TUESDAY 11 FEBRUARY 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      22   -2     650   3     26    0     800   3
KAMLOOPS     KEL      10   -6     450   1     11   -4     550   1
OKANAGAN     KEL      11   -5     500   1     19   -3     700   3
CASTLEGAR    SPOK     21   -2     850   4     21   -2     850   4
CRANBROOK    SPOK      9   -7     950   5      9   -4     950   5
REVELSTOKE   KEL      10   -5     550   1     10   -5     550   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   19   SW  37
CRANBROOK             VR   5   S   26

TODAY'S VENTING: POOR


VENTING FOR WEDNESDAY: 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.      9   -9     950  10      9   -5     950  10
PR. GEORGE   P.G.      9  -12     700   0     11   -8     850   2
SMITHERS     P.G.     15   -5     900   2     20   -4     950   3
WELLS GRAY   P.G.      9   -7    1000  10      9   -5    1000  10
FT NLSN      F.N.      9  -14     400   3     34   -8     700   8
FT STJOHN    F.N.      9  -12     700  11      9   -9     700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   30   S   26
SMITHERS              SE   9   VR  26

TODAY'S VENTING: POOR


VENTING FOR WEDNESDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    4     100   9      9    5     100   9
FRASER VLY   QUIL      9    2      50   9      9    4      50   9
SRN VRISL    QUIL     12    4     100   5     14    5     100   5
CNTRL VRISL  QUIL      9    2      50   5      9    3      50   5
NRN VRISL    HRDY     22    5     150  11     32    6     250  11
TERRACE      ANT       9    0     200  25     10    1     200  25
STEWART      ANT       9    3       0  15      9    1       0  15


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  31   S   33   SW  35
PORT HARDY   SE  22   S    9   VR   5
SANDSPIT     SW  13   W   13   NW   9

TODAY'S VENTING: POOR


VENTING FOR WEDNESDAY: 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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