FPCN39 CWLW 041408
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 SATURDAY 4 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      75   12     450  25     86   15     850  25
KAMLOOPS     KEL      67   12     650  12     82   15    1300  12
OKANAGAN     KEL      73   11     550  14     80   14     950  14
CASTLEGAR    KEL       9   10     500   4     70   12     900   5
CRANBROOK    KEL       9    8     950   6     81   11    1900  12
REVELSTOKE   KEL       9    9     450   2     75   11     650   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   W   30   W   63
CRANBROOK             W   22   W   61

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          900 m         12 C
SPOKANE         NOT AVAILABLE

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: 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.     52    7    1800   6     61    9    2150   6
PR. GEORGE   P.G.     10    5     700   9     64    9    1750   7
SMITHERS     P.G.      9    6     500   1     56   12    1950   5
WELLS GRAY   P.G.     40    5    1600   6     69   10    2400   6
FT NLSN      F.N.      9    2     400   5     87    6    1600  12
FT STJOHN    F.N.     70    2    1350  13     90    7    3700  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW  24   NW  33
SMITHERS              NW  24   NW  33

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      NO INVERSION
FT. NELSON       400 m          3 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    HRDY     61   14     650  12    100   16    1650  15
FRASER VLY   HRDY     57   13     350  10     83   15    1650  13
SRN VRISL    HRDY     57   13     350  10     95   16    1600  13
CNTRL VRISL  HRDY     57   12     500   9     80   15    1600  12
NRN VRISL    HRDY     60   12     250  10     79   14    1500  10
TERRACE      ANT      80    8     200  14     78   12    1600  15
STEWART      ANT      88   11     450  11     78   12    1600  11

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  31   SW  39   SW  46
PORT HARDY   NW  31   NW  39   NW  43
SANDSPIT     NW  43   NW  46   NW  48

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NOT AVAILABLE
PORT HARDY       400 m         13 C
ANNETTE          600 m         12 C

TODAY'S VENTING: GOOD.

VENTING FOR SUNDAY: GOOD.

VENTING OUTLOOK MONDAY THRU WEDNESDAY: GOOD.




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


END/JMS