FPCN39 CWLW 261418
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 26 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      19    6     500   3     71    8     950  12
KAMLOOPS     KEL      15    6     550   3    100   10    3350  17
OKANAGAN     KEL      14    4     500   3    100    9    2750  17
CASTLEGAR    SPOK     74    4    1100  16    100    7    1750  21
CRANBROOK    SPOK    100    4    2150  24    100    7    3950  23
REVELSTOKE   KEL      10    2     450   3     12    4     550   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  28
CRANBROOK             W   13   W   31

TODAY'S VENTING: POOR BECOMING GOOD EARLY THIS AFTERNOON.

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    2    2650  22    100    6    3950  20
PR. GEORGE   P.G.     32    1     850  17    100    4    2100  24
SMITHERS     P.G.      9   -1     500   8     47    3     900  11
WELLS GRAY   P.G.      9   -2     500   7    100    6    4000  20
FT NLSN      F.N.     39   -6    1000   6     44   -5    1100   6
FT STJOHN    F.N.     46   -4    1200   9     48   -2    1200   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  22   SW  31
SMITHERS              S   15   S   31

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.

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     56    5     450  16    100    9    2300  17
FRASER VLY   QUIL     55    5     400  16    100    9    2250  17
SRN VRISL    QUIL     16    4     200   4    100    9    2150  14
CNTRL VRISL  QUIL     36    6     800   4    100   10    2500  15
NRN VRISL    HRDY     27    4     150  13    100    7    1800  12
TERRACE      ANT       9    1     250   8     71    3    1250   8
STEWART      ANT       9   0-2    100   6     26   3     350    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  33   S   43   S   43
PORT HARDY   SE  76   S   94   S   91
SANDSPIT     SE  82   SE  78   SE  67

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