FPCN39 CWLW 061418
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 6 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      12    1     450   1     50    3    1250   4
KAMLOOPS     KEL      11    0     500   1     50    2    1250   3
OKANAGAN     KEL      11    0     500   1     50    1    1300   2
CASTLEGAR    SPOK      9    0     500   7     57    2    1300   8
CRANBROOK    SPOK      9   -6     950   8     60   -3    1450   8
REVELSTOKE   KEL      19    1     850   3     28    2    1050   3

*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    VR   5   W   19   W   33
CRANBROOK             W   13   W   35

TODAY'S VENTING: Good in the Southeast. Fair in the Southwest.


VENTING FOR MONDAY: 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   -3     950  14     60   -2    1200  14
PR. GEORGE   P.G.     10   -1     700   1     45   -2     700   1
SMITHERS     P.G.     10   -3     500   1     30   -1     500   1
WELLS GRAY   P.G.     10   -4     500   3     60   -2    1200  14
FT NLSN      F.N.     10  -20     850   5     10  -18     100  22
FT STJOHN    F.N.     10  -12     700  14      9   -9     700  14

*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            W   22   W   30
SMITHERS              S   30   SW  30

TODAY'S VENTING: FAIR TO GOOD IN THE CARIBOO PRINCE GEORGE AREA.
 POOR IN THE NORTHWEST AND EAST OF THE ROCKIES.

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      9    6     100  15     65    7    1200  12
FRASER VLY   QUIL      9    4      50  15     60    6    1200  10
SRN VRISL    QUIL      9    4       0  12     65    7    1200  12
CNTRL VRISL  QUIL      9    4      50  12     60    6    1200  12
NRN VRISL    HRDY     11    3      50   5     50    5    1400   5
TERRACE      ANT       9    0     200   6     40    2     800   6
STEWART      ANT      10    2     200   5     40    2     700   3

*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    SW  17   W   28   W   35
PORT HARDY   S   46   S   48   W   56
SANDSPIT     S   93   S   87   SW  85

TODAY'S VENTING: GOOD ON THE SOUTH COAST BECOMING FAIR IN THE NORTH.


VENTING FOR MONDAY: GOOD.


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


END/GF