FPCN39 CWLW 271350
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 27 FEBRUARY 1998 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     500   0     30    4     850   3
KAMLOOPS     KEL       9    0     550   0     40    4    1200   4
OKANAGAN     KEL       9   -1     550   0     34    3    1000   4
CASTLEGAR    SPOK     11    2     600   4     39    4    1200   5
CRANBROOK    SPOK      9    0     950   7    100    3    3950   9
REVELSTOKE   KEL      16    1     800   2     36    3    1200   4

*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   VR   5   VR   5
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: FAIR.

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.      9   -6     950   2     46    0    1500   4
PR. GEORGE   P.G.     11   -5     850   2     43    0    1300   6
SMITHERS     P.G.     11   -6     700   1     33    0     950   6
WELLS GRAY   P.G.      9   -3    1000   2     50    1    2000   6
FT NLSN      F.N.      9   -7     400   4     33   -2     950   6
FT STJOHN    F.N.      9   -4     700   7     33   -2     900   7

*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            VR   5   S    9
SMITHERS              SE  20   S    9

TODAY'S VENTING: FAIR.

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     13    5     350   2     45    9    1800   8
FRASER VLY   QUIL     13    5     350   2     45    9    1700   8
SRN VRISL    QUIL     16    7     750   1     42   10    2000   8
CNTRL VRISL  QUIL     12    5     300   1     33    8    1500   2
NRN VRISL    HRDY      9    2     200   4     54    7    1300   8
TERRACE      ANT      10    0     250   4     32    3     650  12
STEWART      ANT       9    0     200   7     32    3     650   7

*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    SE  15   SE  17   S    9
PORT HARDY   SE  39   S   44   S   28
SANDSPIT     SE  63   S   67   S   59

TODAY'S VENTING: FAIR.

VENTING FOR SATURDAY: POOR




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


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