FPCN39 CWLW 131405
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 13 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      36    6     450  20     47    7     650  20
KAMLOOPS     KEL       9    3     500   0     42    6     700  12
OKANAGAN     KEL       9    4     450   0     35    6     650   6
CASTLEGAR    SPOK      9    2     500   6     28    4     700  12
CRANBROOK    SPOK     11    3     950  41     31    4    1100  10
REVELSTOKE   KEL       9    3     450   7     26    4     600   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
PENTICTON    S    9   SW  20   SW  41
CRANBROOK             W   17   W   44

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.     19    4    1050   8     59    6    1300  15
PR. GEORGE   P.G.     18    5     700  10     40    7    1200  15
SMITHERS     P.G.     13    3     500   8     31    5     700   8
WELLS GRAY   P.G.     32    3    1050  12     50    7    1850  15
FT NLSN      F.N.     17  -10     650   3     19   -9     700   3
FT STJOHN    F.N.     18    0    1000   8     36    3    1300   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   W   41
SMITHERS              SW  41   SW  41

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     40   10    1050  14     70   12    1950  18
FRASER VLY   QUIL     35    9     400  10     66   11    1850  15
SRN VRISL    QUIL     45   10     650  15     70   12    1900  16
CNTRL VRISL  QUIL     20    6     250   6     50   10     650  12
NRN VRISL    HRDY     19    8     150  10     54   10     800  15
TERRACE      ANT      17    5     250  10     36    6     500  12
STEWART      ANT      14    4     200   8     33    5     500   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   33   S   43   S   46
PORT HARDY   S   61   S   72   S   69
SANDSPIT     S   69   S   70   S   67

TODAY'S VENTING: GOOD SOUTH AND FAIR NORTH.


VENTING FOR SATURDAY: FAIR TO POOR



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


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