FPCN39 CWLW 091407
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 THURSDAY 9 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       9    8     200   4     47   11    1000   6
KAMLOOPS     KEL      39    9     950   6     98   11    1550  12
OKANAGAN     KEL      28    8     700   5     90   11    1500  10
CASTLEGAR    SPOK     29    9     800   7     75   12    1250  12
CRANBROOK    SPOK     27    7    1100  13    100   10    2150  16
REVELSTOKE   KEL      22    7     700   5     34    8     950   6

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SE  11   S   30   S   65
CRANBROOK             SW  19   SW  48

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         10 C
SPOKANE         1100 m          9 C

TODAY'S VENTING: Fair to good.

VENTING FOR FRIDAY: Good.

VENTING OUTLOOK SATURDAY THRU MONDAY: 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.     23    4    1200  17     90    8    1900  21
PR. GEORGE   P.G.     78    3    1400  15     89    6    1600  15
SMITHERS     P.G.     60   -3    1500  10     70    4    1350  10
WELLS GRAY   P.G.     82    4    1650  17    100    7    2350  20
FT NLSN      F.N.     15   -2    1600   5     10    0    1750   5
FT STJOHN    F.N.     30   -4    1700  10     40   -3    1750  12

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   22   S   24
SMITHERS              E   22   SE  24

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1700 m         10 C
FT. NELSON      No Inversion

TODAY'S VENTING: Good Central Interior. Poor northeast.

VENTING FOR FRIDAY: Good Central Interior. Poor northeast.

VENTING OUTLOOK SATURDAY THRU MONDAY: Good.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   11     600  45    100   12     800  45
FRASER VLY   QUIL     11   10      50  44    100   12     750  45
SRN VRISL    QUIL    100   13     900  36    100   14    1150  39
CNTRL VRISL  QUIL     84   11     450  27    100   12     700  36
NRN VRISL    HRDY     70   11     450  19    100   12    1100  28
TERRACE      ANT      10    5     200  20    100    8    1450  14
STEWART      ANT      77    9     750  13     21    8     150   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   52   S   59   S   54
PORT HARDY   E   19   E   22   E   22
SANDSPIT     N   50   N   39   N   28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      No inversion
PORT HARDY       100 m         11 C
ANNETTE           30 m          6 C

TODAY'S VENTING: Good.

VENTING FOR FRIDAY: Good.

VENTING OUTLOOK SATURDAY THRU MONDAY: Good.

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


END/DB