FPCN39 CWLW 121336
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 PDT MONDAY 12 OCTOBER 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   SPOK      9   10     200   3     35   13     800   5
KAMLOOPS     SPOK      9    9     350  10     75   12     950  15
OKANAGAN     SPOK     21   10     750   3     50   14     900   9
CASTLEGAR    SPOK      9    8     500   3     26   12     900   5
CRANBROOK    SPOK      9    5     950   5     24   11    1050   5
REVELSTOKE   SPOK      9    7     450   5     30   11     800   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   22   SW  54
CRANBROOK             S   20   S   61

TODAY'S VENTING: GENERALLY FAIR TO POOR. GOOD IN STRONG WINDS
AT KAMLOOPS.

VENTING FOR TUESDAY: 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.     71    6    1250  20     80   11    2400  21
PR. GEORGE   P.G.      9    5     700   3     67    9    1450  10
SMITHERS     P.G.      9    3     500   3      9    6     950   3
WELLS GRAY   P.G.    100    7    2050  30    100   11    2450  30
FT NLSN      F.N.     10    1     400  14     81    3    1000  10
FT STJOHN    F.N.     55    0    1000  19    100    2    1900  10

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   46   S   33
SMITHERS              S   31   S   33

TODAY'S VENTING: GOOD IN STRONG WINDS BUT POOR IN SMITHERS.

VENTING FOR TUESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     12   12     100  10    100   16     950  17
FRASER VLY   QUIL      9   12      50   9    100   15     750  11
SRN VRISL    QUIL      9   12       0  12    100   16     850  25
CNTRL VRISL  QUIL      9   11      50  12     54   13     200  13
NRN VRISL    HRDY     83   11     300  20    100   13     550  30
TERRACE      ANT      10    6     250  16     87    9    1200  14
STEWART      ANT       9    9       0  10      9    9       0  10

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   48   S   65   S   63
PORT HARDY   S   59   S   74   S   69
SANDSPIT     S   33   S   37   S   33

TODAY'S VENTING: GOOD IN STRONG WINDS EXCEPT POOR OVER THE FAR NORTH.


VENTING FOR TUESDAY: FAIR




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


END/LM