FPCN39 CWLW 251431
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 25 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   3     64   14    1200   7
KAMLOOPS     KEL       9    5     350   3     46    7     950   7
OKANAGAN     KEL       9    6     350   3     50    9    1050   7
CASTLEGAR    SPOK     16    5     750   3     17    7     750   3
CRANBROOK    SPOK      9    4     700   3     30    9     950   5
REVELSTOKE   KEL       9    4     450   3     41    6     950   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    VR   5   W   11   W   17
CRANBROOK             NW   9   NW  20

TODAY'S VENTING: FAIR TO POOR

VENTING FOR MONDAY: 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    6     950  19     56   13    1250  19
PR. GEORGE   P.G.      9    6     700   2     42   12    1050  10
SMITHERS     P.G.     13    6     750   2     28   10     750   8
WELLS GRAY   P.G.      9    6    1000  19    100   14    4000  22
FT NLSN      F.N.      9    4     400  18     37   11     550  18
FT STJOHN    F.N.      9    6     700  22      9   12     700  22

*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            SW  57   W   69
SMITHERS              SW  70   SW  69

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     21   12     200   9     76   15     700  16
FRASER VLY   QUIL     22   12     200   9     96   16    1000  17
SRN VRISL    QUIL     21   12     200   7     47   15     450  11
CNTRL VRISL  QUIL      9    9      50   4     22   13     250   7
NRN VRISL    HRDY      9   11       0   4     16   14     200   4
TERRACE      ANT       9   10      50  22     10    9     200  44
STEWART      ANT       9    8       0  20      9    9       0  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
VANCOUVER    S   13   SW  22   SW  33
PORT HARDY   S   59   SW  72   SW  76
SANDSPIT     W   46   W   65   W   85

TODAY'S VENTING: FAIR

VENTING FOR MONDAY: FAIR

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

END/MWSO