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2
FPCN39 CWLW 011531
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 1 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      11    2     750   1     77    5    1800   8
KAMLOOPS     KEL      11    2     750   8     83    3    1800   12
OKANAGAN     KEL       9   -1     750   3     70    3    1800   8
CASTLEGAR    SPOK      9    1     800   4     38    2    1400   4
CRANBROOK    SPOK      9    0     950   6     32    2    1400   6
REVELSTOKE   KEL      11    1     750   1     24    1    1400   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    SW   9   W   19   W   33
CRANBROOK             W   11   W   33

TODAY'S VENTING: FAIR TO GOOD.
VENTING FOR SUNDAY: FAIR TO 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   -2     950   3     58    0    1900   8
PR. GEORGE   P.G.      9   -7     700   2     42    0    1200   8
SMITHERS     P.G.     16    1     700   8     57    2    1300   8
WELLS GRAY   P.G.      9   -3    1000   5     33    1    1300  10
FT NLSN      F.N.     11  -10     700   3     11   -4     700   3
FT STJOHN    F.N.      9   -1     700   7     77    2    2300   8


*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            W   26   W   35
SMITHERS              SW  28   SW  35

TODAY'S VENTING: FAIR TO GOOD EXCEPT POOR IN FORT NELSON
VENTING FOR SUNDAY: FAIR TO POOR


COAST
           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12    7     150   5     69    9    1500   7
FRASER VLY   QUIL     12    6     150   5     81    8    1500  10
SRN VRISL    QUIL     15    8     150   9     81    9    1500  10
CNTRL VRISL  QUIL     11    6     100   6     85    7    1800   9
NRN VRISL    HRDY     10    6     100   5     67    8    1800   5
TERRACE      ANT       9    3     250   8     72    4    1300  10
STEWART      ANT       5    4     100   2     57    4    1300   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  24   W   31   SW  35
PORT HARDY   W   24   W   33   W   35
SANDSPIT     W   31   W   31   SW  26

TODAY'S VENTING: GOOD THIS AFTERNOON
VENTING FOR SUNDAY: FAIR TO POOR


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

END/MWSO/TAL


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