FPCN39 CWLW 251410
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 25 NOVEMBER 1998 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    6     200   2     80    9    1800  10
KAMLOOPS     KEL       9    5     350   2     97   11    1800  11
OKANAGAN     KEL       9    5     350   2     83   10    1400  11
CASTLEGAR    SPOK      9    4     500  12     77    7    1000  21
CRANBROOK    SPOK     11    2     950  42    100    5    1500  44
REVELSTOKE   KEL       9    4     450   2      9    6     450   2


*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    VR   5   SW  19   SW  44
CRANBROOK             SW  26   SW  78

TODAY'S VENTING: GENERALLY GOOD.



VENTING FOR THURSDAY: 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.     82    3    1250  40    100    8    3950  38
PR. GEORGE   P.G.     10    2     700  11    100    6    1350  31
SMITHERS     P.G.      9   -2     500  11     90    1    1800  11
WELLS GRAY   P.G.     93    3    1350  40    100    8    4000  38
FT NLSN      F.N.     22  -12     750   4     24  -10     750   4
FT STJOHN    F.N.     30   -5     950   9     36   -2    1050   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  63   SW  80
SMITHERS              S   54   SW  80

TODAY'S VENTING: GOOD IN THE CENTRAL INTERIOR. POOR TO FAIR EAST OF
THE ROCKIES.




VENTING FOR THURSDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11   10     100  28     75   12     800  28
FRASER VLY   QUIL     11    9      50  28     70   11     800  28
SRN VRISL    QUIL      9   10       0  11    100   13     950  29
CNTRL VRISL  QUIL      9    7      50  11     65    8     700  11
NRN VRISL    HRDY      9    7       0  14    100   10    1000  21
TERRACE      ANT       9    1     200  33     70    2    1000  33
STEWART      ANT       9    3       0  15     60    2     800  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   35   S   44   SW  46
PORT HARDY   S   52   SW  69   SW  76
SANDSPIT     S   96   S   96   S   85

TODAY'S VENTING: GOOD




VENTING FOR THURSDAY: GOOD




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


END/MWSO