FPCN39 CWLW 151356
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 15 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     200   4     70    7    1500   6
KAMLOOPS     KEL      14    2     450   4     78    7    1750   8
OKANAGAN     KEL       9    1     350   4     74    6    1600   8
CASTLEGAR    SPOK     25    2     800   5     54    5    1100   9
CRANBROOK    SPOK      9   -1     950  10     74    3    2000   9
REVELSTOKE   KEL      11    2     500   4     59    4    1450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  41   W   96
CRANBROOK             W   22   W   78

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: 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.     16    0    1000  12     70    4    1800  10
PR. GEORGE   P.G.     10    0     700  10     65    3    1450  10
SMITHERS     P.G.      9   -1     500  10     42    1     900  10
WELLS GRAY   P.G.     15   -1    1050  12     67    2    1800  10
FT NLSN      F.N.      9  -18     400   1     10  -12     500   1
FT STJOHN    F.N.     11   -3     750   4     47    2    1450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   65   W   78
SMITHERS              SW  57   SW  78

TODAY'S VENTING: GOOD TO FAIR EXCEPT POOR IN THE EXTREME NORTHEAST.

VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6      50  28    100    9     800  30
FRASER VLY   QUIL     10    5      50  28    100    9     750  30
SRN VRISL    QUIL      9    6      50  28    100    9     650  30
CNTRL VRISL  QUIL      9    6      50  28    100    8     650  28
NRN VRISL    QUIL      9    6      50  28    100    8     650  28
TERRACE      ANT       9    0     200  23     60    2     550  20
STEWART      ANT       9    0      20  15     64    2     500  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
VANCOUVER    SW  35   W   61   W   94
PORT HARDY   SW  35   SW  44   W   85
SANDSPIT     SW  46   SW  50   SW  59

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: FAIR

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

END/RET