FPCN39 CWLW 011425
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 1 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    2     200   5     35    5     600  12
KAMLOOPS     KEL       9    2     350   5     54    5    1100   7
OKANAGAN     KEL       9    1     350   5     54    5    1100  10
CASTLEGAR    SPOK      9    3     500   8     60    5     950  10
CRANBROOK    SPOK      9    0     950  10     78    2    1200  12
REVELSTOKE   KEL       9    1     450   5     13    2     500   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
PENTICTON    S   15   SW  44   SW 107
CRANBROOK             SW  30   SW  85

TODAY'S VENTING: POOR RISING TO FAIR THIS AFTERNOON OVER ALL AREAS
EXCEPT REVELSTOKE.

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.     10   -1     950  22    100    2    2000  20
PR. GEORGE   P.G.     10   -6     800   1     22    0     950   6
SMITHERS     P.G.     12   -5     800   1     12   -2     850   1
WELLS GRAY   P.G.     10   -3    1000  22    100    1    1900  20
FT NLSN      F.N.      9  -22     400   6     41  -17     600  10
FT STJOHN    F.N.      9  -12     700  14     20   -7     800  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   56   SW  70
SMITHERS              S   26   SW  70

TODAY'S VENTING: POOR RISING TO GOOD AT WELLS GRAY AND WILLIAMS LAKE
THIS AFTERNOON.

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     100  34    100    9     650  35
FRASER VLY   QUIL      9    5      50  34     85    8     450  34
SRN VRISL    QUIL     19    7     200   6    100   10     750  28
CNTRL VRISL  QUIL      9    2      50   6      9    0      50   6
NRN VRISL    HRDY     10    6       0  24    100    8     900  32
TERRACE      ANT       9   -1     200  40     10    2     200  40
STEWART      ANT       9    3       0  15      9    2       0  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  43   SW  69   SW  80
PORT HARDY   SW  46   SW  57   SW  56
SANDSPIT     W   48   SW  50   SW  46

TODAY'S VENTING: POOR RISING TO GOOD ALL AREAS EXCEPT CENTRAL
VANCOUVER ISLAND AND IN THE NORTHWEST.


VENTING FOR WEDNESDAY: FAIR


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


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