FPCN39 CWLW 131438
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 SUNDAY 13 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    7     200   2     30    9     600  12
KAMLOOPS     KEL      44   12    1050   9     74   12    1350   9
OKANAGAN     KEL      11    9     450   2     30    9     850  12
CASTLEGAR    SPOK      9    3     500   8      9    5     500   8
CRANBROOK    SPOK      9    4     950  34      9    5     950  14
REVELSTOKE   KEL       9    5     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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   13   S   30   SW  69
CRANBROOK             SW  22   SW  67

TODAY'S VENTING: POOR EXCEPT GOOD IN KAMLOOPS AREA BY LATE AFTERNOON.

VENTING FOR MONDAY: 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.     30    2    1100  10     54    2    1500  10
PR. GEORGE   P.G.     30    1     800  10     54    2    1200  10
SMITHERS     P.G.      9   -1     500   1     80    0    1500   8
WELLS GRAY   P.G.     30    0    1300  10     54    1    1500  10
FT NLSN      F.N.      9  -12     400   5      9   -8     400   5
FT STJOHN    F.N.      9    2     700  10      9    2     700  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  19   W   19
SMITHERS              W   30   W   19

TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD THIS AFTERNOON IN THE
NORTHWEST.

VENTING FOR MONDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     11   10     100  27    100   10    1100  27
FRASER VLY   QUIL    100   13    1250  25    100   13    1250  25
SRN VRISL    QUIL     16   10     150   7    100   11    1400  17
CNTRL VRISL  QUIL      9    8      50   7    100    9    1050  10
NRN VRISL    HRDY     10    6      50   4    100    8    1150  10
TERRACE      ANT       9    1     200   9    100    1    1200  10
STEWART      ANT       9    1     100   5    100    1    1200  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   33   W   44   SW  56
PORT HARDY   NW  46   NW  54   NW  43
SANDSPIT     W   37   W   43   W   41

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: FAIR TO GOOD.




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


END/JDG