FPCN39 CWLW 071426
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 SUNDAY 7 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       9    5     200   8     34    7     500   8
KAMLOOPS     KEL      19    5     500   8     48    7     850  10
OKANAGAN     KEL       9    3     350   8     42    6     550  10
CASTLEGAR    SPOK      9    3     500  19     64    4     500  19
CRANBROOK    SPOK     76    3    1200  38    100    4    1550  38
REVELSTOKE   KEL       9    2     450   8     11    4     450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   SW  31   SW  65
CRANBROOK             SW  31   SW  78

TODAY'S VENTING: FAIR SOUTHWEST. GOOD SOUTHEAST. POOR NORTHEAST.




VENTING FOR MONDAY: POOR TO FAIR.




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   -1     950  17     94    2    2000  15
PR. GEORGE   P.G.      9    0     700  10     72    2    1300  15
SMITHERS     P.G.      9   -3     500   1      9    0     500   1
WELLS GRAY   P.G.     ##   ##     ###  ##     96    2    2150  14
FT NLSN      F.N.      9  -17     450   0      9  -15     500   0
FT STJOHN    F.N.      9   -8     700  14      9   -8     700  14

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  24   SW  33
SMITHERS              S   24   SW  33

TODAY'S VENTING: GOOD SOUTH. POOR NORTH.




VENTING FOR MONDAY: POOR TO FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    4     100   6     68    7     950   9
FRASER VLY   QUIL     30    6     450   6     59    7     850   8
SRN VRISL    QUIL      9    6     300   0     68    8    1100   7
CNTRL VRISL  QUIL      9    4      50   0     68    6     750  10
NRN VRISL    HRDY     10    1      50   3     56    4     750   8
TERRACE      ANT      10   -1     200  19     40    0     400  19
STEWART      ANT      ##   ##     ###  ##     29    0     200   9

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   46   W   52   SW  43
PORT HARDY   SW  26   SW  30   SW  33
SANDSPIT     SW  43   SW  48   SW  48

TODAY'S VENTING: GOOD SOUTH TO POOR FAR NORTH.




VENTING FOR MONDAY: FAIR TO GOOD.




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


END/TCS