FPCN39 CWLW 091327
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 9 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      12   11     500   1     55   16    1550   4
KAMLOOPS     KEL      10    9     500   1     74   15    2100   5
OKANAGAN     KEL      10    8     450   1     74   15    2100   5
CASTLEGAR    SPOK     15   10     720   2     85   14    1550   7
CRANBROOK    SPOK     12    9     800   2     70   14    1550   5
REVELSTOKE   KEL      10    9     500   1     24   12    1150   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   SW  15   SW  26
CRANBROOK             SW   9   SW  26

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD

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.     69    6    1700  11    100   11    2900  15
PR. GEORGE   P.G.     30    4    1000   7     68    8    1650   9
SMITHERS     P.G.      9    4     550   2     55    7    1250   8
WELLS GRAY   P.G.     77    7    1900  11    100   11    2950  15
FT NLSN      F.N.      9   -1     400   4     37    1    1150   4
FT STJOHN    F.N.     41    0    1650   4     44    1    1750   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              E   15   SW

TODAY'S VENTING: GOOD EXCEPT FAIR EXTREME NORTHEAST SECTIONS.

VENTING FOR SATURDAY:  GOOD EXCEPT FAIR NORTHEAST SECTIONS.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     ##   ##     ###  ##    100   15    1550  20
FRASER VLY   QUIL     59   11     450  17    100   14    1250  21
SRN VRISL    QUIL     63   12     600  12    100   16    1600  18
CNTRL VRISL  QUIL      9    9      50   3     44   11     350  12
NRN VRISL    HRDY      9    9       0   4     50   12     700   7
TERRACE      ANT       9    6     250   6      9    8     250   6
STEWART      ANT       9    7       0   2      9    8       0   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
VANCOUVER    SW  15   SW  17   SW  20
PORT HARDY   S   17   SW  19   SW  19
SANDSPIT     NW   9   VR   5   VR   5

TODAY'S VENTING: FAIR EXCEPT GOOD SOUTH COAST SECTIONS.

VENTING FOR SATURDAY: GOOD

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

END/MWSO