FPCN39 CWLW 281520
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 28 OCTOBER 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      12    8     500   1     49   11     950   6
KAMLOOPS     KEL      11    7     550   1     64   11    1400   7
OKANAGAN     KEL      11    7     550   1     57   10    1250   6
CASTLEGAR    KEL      11    7     600   1     50    9    1100   6
CRANBROOK    KEL      10    4     950   2     65    8    2100   8
REVELSTOKE   KEL      10    6     550   1     28    8     850   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    SW   9   SW  22   W   46
CRANBROOK             SW  17   W   48

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         800 m           7 C
SPOKANE         MSG            MSG

TODAY'S VENTING: FAIR




VENTING FOR WEDNESDAY: FAIR




VENTING OUTLOOK THURSDAY THRU SATURDAY: 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.      9    3     950   8     70    6    2100  12
PR. GEORGE   P.G.     14    3     800   5     37    6    1050   9
SMITHERS     P.G.     13    3     700   2     19    5     800   4
WELLS GRAY   P.G.     18    3    1050   8     70    5    2100  12
FT NLSN      F.N.     20   -5     750   3     21   -4     800   3
FT STJOHN    F.N.     23   -2    1200   3     39    0    1150   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   37   SW  41
SMITHERS              S   41   SW  41

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1200 m          9 C
FT. NELSON      1200 m          1 C

TODAY'S VENTING: FAIR




VENTING FOR WEDNESDAY: FAIR




VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     36   10     300  13     83   12     800  16
FRASER VLY   QUIL     14    9     200   4     82   12     750  16
SRN VRISL    QUIL     13   10     250   2     81   13     900  13
CNTRL VRISL  QUIL     11    8     150   2     40   11     400  10
NRN VRISL    HRDY     14    9      50  15     55   11     500  15
TERRACE      ANT      10    6     200  15     55    9     650  15
STEWART      ANT       9    6       0  13     60    9     650  13

*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    S   46   SW  63   SW  63
PORT HARDY   S   46   SW  57   SW  67
SANDSPIT     S   57   S   61   S   63

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       450 m         12 C
PORT HARDY       600 m         11 C
ANNETTE         1700 m         14 C

TODAY'S VENTING: GOOD




VENTING FOR WEDNESDAY: FAIR




VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR




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


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