FPCN39 CWLW 141353
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 14 DECEMBER 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    3     500   0     37    6     800   5
KAMLOOPS     KEL       9    3     450   0     38    5    1000   5
OKANAGAN     KEL       9    2     450   0     41    6    1250   5
CASTLEGAR    SPOK     34    3     950   6     45    6    1200   6
CRANBROOK    SPOK     18    0    1000  15     65    3    1700  13
REVELSTOKE   KEL       9    2     500   6     21    4     650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  31
CRANBROOK             W    9   W   24

TODAY'S VENTING: FAIR LOCALLY GOOD.

VENTING FOR TUESDAY: 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.     10   -4     950  12     81    1    2000  15
PR. GEORGE   P.G.      9   -5     700  11     38   -1     950  12
SMITHERS     P.G.      9   -6     500   8     39   -2     800  12
WELLS GRAY   P.G.      9   -2    1000  12     93    1    2400  15
FT NLSN      F.N.      9  -15     400  23      9  -14     400  23
FT STJOHN    F.N.     61  -10     950  29     81   -8    1100  29

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   22   S   17
SMITHERS              E   15   VR  17

TODAY'S VENTING: FAIR LOCALLY GOOD EXCEPT POOR EXTREME NORTHEAST.

VENTING FOR TUESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     53    6     600  11    100    9    1750  17
FRASER VLY   QUIL     20    4     300   5     99    8    1200  15
SRN VRISL    QUIL     34    5     350   8    100    9    1500  15
CNTRL VRISL  QUIL      9    1      50   3     80    8     950  12
NRN VRISL    HRDY     18    4     250   4     79    7     950  11
TERRACE      ANT       9   -1     200  14     43    1     500  14
STEWART      ANT       9    1       0  14     43    1     400  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  31   SW  37   SW  31
PORT HARDY   W   11   W   15   W   17
SANDSPIT     N   30   N   30   N   31

TODAY'S VENTING: GOOD SOUTH. FAIR NORTH.

VENTING FOR TUESDAY: FAIR


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


END/RET