FPCN39 CWLW 281455
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 28 DECEMBER 1997 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      95    6     950  20    100    8    1250  20
KAMLOOPS     KEL      14    2     500   3     60    4    1000  12
OKANAGAN     KEL      14    2     500   3     60    4    1000  12
CASTLEGAR    SPOK      9    2     500  13     72    4    1100  15
CRANBROOK    SPOK     11    1     950  13     69    3    1500  15
REVELSTOKE   KEL      11    1     500   3     24    2     700   7

*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    W   19   W   61   W  119
CRANBROOK             W   31   W  109

TODAY'S VENTING: GOOD LOCALLY POOR

VENTING FOR MONDAY: 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.      9    0     950  26     42    2    1150  18
PR. GEORGE   P.G.     40    2     900  15     45    3    1000  15
SMITHERS     P.G.     38    3     900   9     54    5    1000  12
WELLS GRAY   P.G.     39    2    1150  26     34    2    1150  18
FT NLSN      F.N.     10  -11     450   1     11  -10     550   1
FT STJOHN    F.N.     86    4    1400  18    100    5    1700  20

*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   65   W   80
SMITHERS              W   69   W   80

TODAY'S VENTING: FAIR

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  14      9    8     100  14
FRASER VLY   QUIL      9    6      50  14      9    8      50  14
SRN VRISL    QUIL      9    8       0   5     15   10     150   5
CNTRL VRISL  QUIL      9    6      50   5      9    6      50   5
NRN VRISL    HRDY     45    6     350  13     60    8     550  13
TERRACE      ANT      10    4     250  17     10    5     250  17
STEWART      ANT       9    5       0   8      9    5       0   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  61   W   93   W  106
PORT HARDY   W   65   W   76   W   87
SANDSPIT     W   76   W   91   W  106

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR MONDAY: POOR

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


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