FPCN39 CWLW 121430
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 12 MARCH 1999 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   QUIL    100    7     950  40    100    8    1100  40
KAMLOOPS     QUIL    100    7    1200  40    100    9    1450  44
OKANAGAN     QUIL    100    5     900  39    100    8    1350  43
CASTLEGAR    QUIL     83    3     800  39    100    7    1400  43
CRANBROOK    QUIL     11    1     950  49    100    7    2050  47
REVELSTOKE   QUIL     10    2     450  38    100    6    1150  40

*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   11   S   20   SW  35
CRANBROOK             SW  15   SW  43

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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.    100    4    1650  38    100    7    2700  36
PR. GEORGE   P.G.    100    5    1550  35    100    7    1800  35
SMITHERS     P.G.      9    3     500  11     72    5    1000  18
WELLS GRAY   P.G.      9    3     500  11    100    8    4000  33
FT NLSN      F.N.     26    2     600   8     56    4     700  19
FT STJOHN    F.N.      9    0     700  27     94    4    1350  24

*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            S   52   SW  72
SMITHERS              SW  39   SW  72

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    7     800  34    100    9    1100  36
FRASER VLY   QUIL    100    8     900  36    100    8     900  36
SRN VRISL    QUIL     97    7     650  27    100    9    1000  32
CNTRL VRISL  QUIL    100    7     650  27    100    8     850  30
NRN VRISL    HRDY     19    6     150  29    100    7     850  23
TERRACE      ANT      10    2     200  34    100    3     600  34
STEWART      ANT      10    1     200  31    100    3     600  34

*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   46   S   63   SW  59
PORT HARDY   S   30   S   44   SW  56
SANDSPIT     SW  44   SW  54   SW  54

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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


END/LEC