FPCN39 CWLW 061441
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 6 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      13    4     500   1     13    5     550   1
KAMLOOPS     KEL      11    3     550   1     15    5     650   2
OKANAGAN     KEL      11    2     500   1     15    5     650   2
CASTLEGAR    SPOK     21    3     750   5     24    5     800   5
CRANBROOK    SPOK      9    0     950  15      9    4     950  15
REVELSTOKE   KEL      10    2     550   1     13    4     650   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE   9   S   30   S   69
CRANBROOK             S   19   S   50

TODAY'S VENTING: POOR

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    2    1200   2     41    4    1700   9
PR. GEORGE   P.G.     11    0     900   1     11    0     900   1
SMITHERS     P.G.      9    0     500   2     13    1     850   1
WELLS GRAY   P.G.      9    1    1000   2     45    3    1650   9
FT NLSN      F.N.     31  -14     950   4     31  -14     950   4
FT STJOHN    F.N.     39  -11    1450   5     41   -8    1500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  31   SE  30
SMITHERS              E   28   SE  30

TODAY'S VENTING: POOR TO 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     15    7     500   4     80   10     500  15
FRASER VLY   QUIL     15    6     500   2     80   10     500  12
SRN VRISL    QUIL     15    6     500   2     80   10     500  15
CNTRL VRISL  QUIL     15    3     500   1     80   10     500  15
NRN VRISL    HRDY     10    9       0  19     70   11     450  19
TERRACE      ANT       9    1     200   6      9    1     200   6
STEWART      ANT       9    4       0   5      9    1       0   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  54   S   59   S   50
PORT HARDY   SE  67   SE  74   SE  67
SANDSPIT     E   30   E   30   E   35

TODAY'S VENTING: GOOD WHERE WINDY. POOR WHERE SHELTERED.

VENTING FOR SATURDAY: FAIR

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


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