FPCN39 CWLW 311348
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 SATURDAY 31 JANUARY 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   0      9    5     500   0
KAMLOOPS     KEL       9    2     450   0     15    5     700   2
OKANAGAN     KEL       9    3     500   0     15    5     700   2
CASTLEGAR    SPOK     21    3     750   5     30    5     950   5
CRANBROOK    SPOK      9    0     950   5     22    3    1200   5
REVELSTOKE   KEL       9    1     450   0      9    2     500   0

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   20   S   33
CRANBROOK             VR   5   SW   9

TODAY'S VENTING: POOR

VENTING FOR SUNDAY: POOR

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    1     950  13     44    5    1250  13
PR. GEORGE   P.G.     14    0     800   6     25    5     950  10
SMITHERS     P.G.     11   -1     700   6     25    2     800   6
WELLS GRAY   P.G.      9    0    1000  13     33    4    1200  13
FT NLSN      F.N.      9  -13     400   4     16   -8     550   4
FT STJOHN    F.N.      9   -1     700   4     11    3     750   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  41   S   33
SMITHERS              SE  50   SE  33

TODAY'S VENTING: POOR LOCALLY FAIR

VENTING FOR SUNDAY: POOR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  10     34   12     350  10
FRASER VLY   QUIL     27    9     250  10     35   12     350  10
SRN VRISL    QUIL     14    6      50  11     38   11     350  11
CNTRL VRISL  QUIL      9    4      50  11     34    8     300  11
NRN VRISL    HRDY     35    9     180  18     51   10     300  18
TERRACE      ANT       9    2     220  12     23    4     300  18
STEWART      ANT      20    2     100  12     40    4     200  18

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  46   S   61   S   72
PORT HARDY   SE  82   S  100   S  104
SANDSPIT     SE  98   SE 100   S   89

TODAY'S VENTING: FAIR LOCALLY POOR

VENTING FOR SUNDAY: FAIR

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


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