FPCN39 CWLW 081426
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 8 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      15    3     555   5     75    4    1500  11
KAMLOOPS     KEL      15    0     555   5     75    5    1550  11
OKANAGAN     KEL       9    0     350   3     75    2    1500  11
CASTLEGAR    SPOK      9    1     500  13     75    2    1500  11
CRANBROOK    SPOK      9   -2     950   5     75   -1    1550  11
REVELSTOKE   KEL      10    1     500   3     75    2    1500   8

*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    VR   5   W   17   W   31
CRANBROOK             W   15   W   39

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR TO 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.     10   -3     500   5     70    2    1550   6
PR. GEORGE   P.G.     10   -2     500   5     70    1    1550   6
SMITHERS     P.G.     10   -3     500   5     70    0    1500   6
WELLS GRAY   P.G.     10   -5     500   5     74    2    1600   6
FT NLSN      F.N.     10  -20     500   5     24  -15     600   7
FT STJOHN    F.N.     10   -6     500   5     47   -6    1050   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   52   W   56
SMITHERS              SW  48   SW  56

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

VENTING FOR WEDNESDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     33    5     200  19    100    8    1700  10
FRASER VLY   QUIL     33    5     200  19    100    7    1750  10
SRN VRISL    QUIL     18    5     200   5    100    9    1750  10
CNTRL VRISL  QUIL     15    4     150   5    100    7    1750  10
NRN VRISL    HRDY     33    5     200  19    100    7    1750  10
TERRACE      ANT      33    5     200  19     80    3    1750  12
STEWART      ANT      33    5     200  19     80    3    1770  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  17   W   24   W   35
PORT HARDY   S   39   SW  44   SW  43
SANDSPIT     S   59   S   65   SW  72

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD




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


END/JMS