FPCN39 CWLW 231321
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 FRIDAY 23 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   KEL       9    7     200   0     23   14    1150   2
KAMLOOPS     KEL       9    6     350   0     19   10    1050   2
OKANAGAN     KEL      14    8     800   1     20   12    1150   2
CASTLEGAR    SPOK     16    6     750   3     17   10     750   3
CRANBROOK    SPOK      9    5     950   5     36   12    1550   5
REVELSTOKE   KEL       9    5     450   0     17    8    1000   2

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   N   13

TODAY'S VENTING: POOR

VENTING FOR SATURDAY: 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    5     950  14     42   14    1200  14
PR. GEORGE   P.G.     16    5     850   4     32   14    1100   6
SMITHERS     P.G.      9    4     750   0     34   11     950   6
WELLS GRAY   P.G.      9    7    1000  14     47   15    1300  14
FT NLSN      F.N.     17    3     500   7     31    8     700   7
FT STJOHN    F.N.     15    5     600   7     66   16    1600   9

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   30   S   31
SMITHERS              SE  43   S   31

TODAY'S VENTING: GENERALLY POOR EXCEPT GOOD IN THE PEACE.

VENTING FOR SATURDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   10     100   8     48   16     950  11
FRASER VLY   QUIL      9   11      50   8     41   20    1100  10
SRN VRISL    QUIL      9    9       0   3     65   16     900  14
CNTRL VRISL  QUIL      9   10      50   3     64   16     900  14
NRN VRISL    HRDY      9   10       0   9     49   15     650   8
TERRACE      ANT      11    7     250  31     11   11     250  31
STEWART      ANT       9    8       0  18      9   11       0  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  26   S   43   S   50
PORT HARDY   SE  65   S   87   S   83
SANDSPIT     SE 100   S   94   S   98

TODAY'S VENTING: GENERALLY FAIR ON THE SOUTH COAST. POOR ON THE
NORTH COAST.

VENTING FOR SATURDAY: FAIR.

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

END/MWSO