FPCN39 CWLW 241433
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 WEDNESDAY 24 FEBRUARY 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   KEL      16    4     650   2     51    7    3000  15

KAMLOOPS     KEL      17    4     800   2     57    7    3000  15

OKANAGAN     KEL      18    5     900   2     59   10    3000  15

CASTLEGAR    SPOK      9    3     500  18      9    6     500  18

CRANBROOK    SPOK      9    1     950  49     11    3     950  15

REVELSTOKE   KEL      14    2     750   2     23    5     950   3


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   SW  33   SW  80
CRANBROOK             SW  22   SW  67

TODAY'S VENTING: FAIR TO GOOD WEST. POOR EAST.




VENTING FOR THURSDAY: FAIR TO 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    2    2100  27    100    5    2450  32

PR. GEORGE   P.G.     92    1    1550  17    100    4    2050  24

SMITHERS     P.G.     71    1    1250  12     91    3    1600  13

WELLS GRAY   P.G.     ##   ##     ###  ##    100    5    2500  32

FT NLSN      F.N.      9  -11     500   0      9   -5     550   0

FT STJOHN    F.N.      9   -7     700   0      9   -4     700   0


*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  52   SW  69
SMITHERS              S   46   SW  69

TODAY'S VENTING: GOOD EXCEPT POOR NORTHEAST.




VENTING FOR THURSDAY: FAIR TO GOOD EXCEPT POOR NORTHEAST.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11   10     100  43     72   11    2800  43

FRASER VLY   QUIL     11    7      50  43     71   10    2700  43

SRN VRISL    QUIL     29   10     100  22     78   11     350  33

CNTRL VRISL  QUIL      9    9      50  22     79   11     350  33

NRN VRISL    HRDY     45    5     350  14     58    7     500  14

TERRACE      ANT       9    1     200  14     66    3     700  17

STEWART      ANT      ##   ##     ###  ##     16    3     100   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   37   S   56   SW  67
PORT HARDY   S   59   S   76   S   72
SANDSPIT     S   24   S   41   S   41

TODAY'S VENTING: GOOD EXCEPT POOR NEAR STEWART.




VENTING FOR THURSDAY: FAIR TO GOOD.




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


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