FPCN39 CWLW 171419
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 17 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      21    5     550   3    100    8    3000  15
KAMLOOPS     KEL      25    5     900   3    100    8    3000  12
OKANAGAN     KEL      15    3     550   3    100    6    3000  12
CASTLEGAR    SPOK      9    2     500   6    100    3    3000  12
CRANBROOK    SPOK     10    0     950  27    100    3    3000  12
REVELSTOKE   KEL      10    1     500   3    100    3    3000  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   26   W   50
CRANBROOK             W   19   W   50

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: 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.    100    2    1750  30    100    6    2800  21
PR. GEORGE   P.G.     40    3    1050  10    100    4    2600  20
SMITHERS     P.G.      9    0     500   2    100    3    2800   2
WELLS GRAY   P.G.     15    1    1000  10    100    6    4000  31
FT NLSN      F.N.      9  -11     400   0     32  -10     750   7
FT STJOHN    F.N.     65   -6    1150  17     85   -5    1450  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  37   W   52
SMITHERS              SW  46   SW  52

TODAY'S VENTING: GOOD EXCEPT POOR NEAR FORT NELSON.

VENTING FOR THURSDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    8     950  31    100   10    1800  32
FRASER VLY   QUIL    100    8     850  31    100   11    2050  33
SRN VRISL    QUIL     38    7     300  12    100   10    1600  29
CNTRL VRISL  QUIL     97    8     700  24    100   11    1950  30
NRN VRISL    HRDY     71    5     600  15    100    8    1350  18
TERRACE      ANT      10    3     200  24    100    4    1200  24
STEWART      ANT      10    3     200  15    100    4    1200  20

*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    W   30   W   39   W   41
PORT HARDY   SW  35   SW  46   SW  46
SANDSPIT     W   76   W   74   SW  57

TODAY'S VENTING: GOOD.

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.


END/MWSO