FPCN39 CWLW 221421
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 MONDAY 22 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      23    5     450   5    100    7     550  25
KAMLOOPS     KEL      46    6     850   9     91    8    1500  12
OKANAGAN     KEL      16    4     500   5     69    7    1200  10
CASTLEGAR    SPOK     21    2     750   5     55    4    1000  12
CRANBROOK    SPOK      9    0     950  24    100    3    1850  23
REVELSTOKE   KEL      11    3     450   5     55    4     700  10

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   SW  35   SW  93
CRANBROOK             SW  22   SW  67

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.     84    2    1250  40    100    5    2300  36
PR. GEORGE   P.G.     10    3     700  25    100    6    1350  35
SMITHERS     P.G.      9    1     500  11     56    3    1500  11
WELLS GRAY   P.G.     ##   ##     ###  ##    100    5    4000  31
FT NLSN      F.N.      9   -7     400   0     22   -8     400   3
FT STJOHN    F.N.     44   -4    1350   6     54   -2    1550   6

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   41   S   46
SMITHERS              SE  28   SE  46

TODAY'S VENTING: GOOD EXCEPT POOR TO FAIR IN THE PEACE

VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11    7     100  39    100   10     850  39
FRASER VLY   QUIL     37    7     300  13    100   10     800  33
SRN VRISL    QUIL     68    8     400  22    100   10     700  26
CNTRL VRISL  QUIL     68    8     400  22    100   10     700  29
NRN VRISL    HRDY     26    6     100  18     92    8     850  18
TERRACE      ANT      10    2     200  27     87    4     700  28
STEWART      ANT      ##   ##     ###  ##     60    4     100  18

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   57   SW  85   SW  94
PORT HARDY   SW  37   SW  50   SW  56
SANDSPIT     W   33   W   28   W   19

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

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


END/MWSO