FPCN39 CWLW 031431
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 3 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   5     65    6    1200   20
KAMLOOPS     KEL       9    2     350   5     50    5    1050   5
OKANAGAN     KEL       9    4     350   5     52    5    1050   5
CASTLEGAR    SPOK      9    1     500  18     54    2     500  18
CRANBROOK    SPOK     11    0     950  29     41    1     950  29
REVELSTOKE   KEL       9    1     450   5     29    2     450   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   S   24   SW  57
CRANBROOK             SW  15   SW  43

TODAY'S VENTING: Generally fair.


VENTING FOR THURSDAY: 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.     20   -3     950  18    100    1    3950  32
PR. GEORGE   P.G.     13   -2     750  10     39   -1     900  10
SMITHERS     P.G.      9   -6     500   2     29   -2     650   2
WELLS GRAY   P.G.     20   -3     900  15    100    1    4000  32
FT NLSN      F.N.     10  -22     300   4     44  -18     850   9
FT STJOHN    F.N.     41  -15    1050  11     47  -12    1100  11

*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            SE  31   S   33
SMITHERS              SE  24   S   33

TODAY'S VENTING: Good over higher elevations. Poor elsewhere.


VENTING FOR THURSDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     30    6     250   9     46    7     400  14
FRASER VLY   QUIL     28    5     200   6     42    6     450  12
SRN VRISL    QUIL     30    6     250   8     43    7     400  10
CNTRL VRISL  QUIL     24    5     200  10     35    6     300  10
NRN VRISL    HRDY     10    4      50   2     17    5     250   4
TERRACE      ANT      10   -2     200  13     49    1     600  13
STEWART      ANT      10   -2     200   9     39    1     550   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   56   S   67   SW  69
PORT HARDY   S   44   SW  56   S   57
SANDSPIT     NE  30   NE  22   NE  19

TODAY'S VENTING: FAIR.


VENTING FOR THURSDAY: FAIR.




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


END/GF