FPCN39 CWLW 161432
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 TUESDAY 16 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      12    2     500   1     28    5     850   3

KAMLOOPS     KEL      31    4     950   4     33    5    1050   4

OKANAGAN     KEL      11    1     550   1     31    4     950   4

CASTLEGAR    SPOK      9    0     500   4      9    2     500   4

CRANBROOK    SPOK     10   -2     950  23     10    0     950  23

REVELSTOKE   KEL      10    0     550   1     19    2     800   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  19   SW  44
CRANBROOK             W   15   W   43

TODAY'S VENTING: POOR.




VENTING FOR WEDNESDAY: POOR




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.     94    1    1500  26    100    3    2150  35

PR. GEORGE   P.G.     29    0     900  10     31    1     950  10

SMITHERS     P.G.     10    0     650   1     15    1     900   2

WELLS GRAY   P.G.     ##   ##     ###  ##    100    3    2200  35

FT NLSN      F.N.      9  -15     400   0      9  -10     400   0

FT STJOHN    F.N.     17   -8     750  15     38   -3     900  15


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   SW  35
SMITHERS              S   39   SW  35

TODAY'S VENTING: POOR EXCEPT GOOD ABOVE ABOUT 1100 METRES AND IN
GUSTY SURFACE WINDS NEAR WILLIAMS LAKE.




VENTING FOR WEDNESDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     82    8     400  38    100    9     750  40

FRASER VLY   QUIL     76    8     300  38     76    8     300  38

SRN VRISL    QUIL     25    8     200  10    100   10     950  35

CNTRL VRISL  QUIL     15    7     100  10     57    8     200  18

NRN VRISL    HRDY     24    6     150  12     67    7     700  12

TERRACE      ANT       9    1     200  31      9    2     200  31

STEWART      ANT      ##   ##     ###  ##      9    2       0  17


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   41   S   57   SW  59
PORT HARDY   S   63   S   80   S   78
SANDSPIT     S   67   S   74   S   74

TODAY'S VENTING: GOOD SOUTH. POOR NORTH.




VENTING FOR WEDNESDAY: POOR




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


END/TCS