FPCN39 CWLW 131449
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 MONDAY 13 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      48   12     950   6     64   15    1300   6
KAMLOOPS     KEL      36    9     800   7     75   14    1550   8
OKANAGAN     KEL       9    7     450   0     60   14    1200   6
CASTLEGAR    SPOK     41    8     850  10     63   11    1100  12
CRANBROOK    SPOK      9    5     950  19     78    9    1500  19
REVELSTOKE   KEL       9    6     450   0     36    9     900   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   24   W   37
CRANBROOK             W   20   NW  61

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1100 m         11 C
SPOKANE         1500 m         11 C

TODAY'S VENTING: POOR THIS MORNING BECOMING GOOD IN THE AFTERNOON.



VENTING FOR TUESDAY: FAIR TO POOR.



VENTING OUTLOOK WEDNESDAY THRU FRIDAY: 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    5     950  25     90   11    2500  10
PR. GEORGE   P.G.     57    5     950  24     73    8    1100  24
SMITHERS     P.G.     36    4     700  16     74    8    1000  20
WELLS GRAY   P.G.     69    8    1350  25    100   12    2650  32
FT NLSN      F.N.     52   -5     750  14     62   -1     950  14
FT STJOHN    F.N.     52   -2    1050  15     66    0    1200  15

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   56   W   72
SMITHERS              SW  52   W   72

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         13 C
FT. NELSON      1100 m         -1 C

TODAY'S VENTING: GOOD.



VENTING FOR TUESDAY: FAIR.



VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   11     250  11     72   13     800  13
FRASER VLY   QUIL      9   11      50  11     70   13     750  13
SRN VRISL    QUIL     38   12     400   9     56   13     650  10
CNTRL VRISL  QUIL      9   10      50   1     49   12     400   9
NRN VRISL    HRDY     23   10     200   8     39   12     450   8
TERRACE      ANT       9    4     200  40      9    7     200  40
STEWART      ANT       9    8       0  15      9    7       0  15

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  37   SW  46   W   46
PORT HARDY   SW  46   SW  48   SW  54
SANDSPIT     SW  35   SW  39   SW  46

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       NONE           N/A
PORT HARDY       300 m         12 C
ANNETTE          NONE           N/A

TODAY'S VENTING: GOOD IN THE SOUTH BECOMING POOR IN THE NORTH.



VENTING FOR TUESDAY: FAIR



VENTING OUTLOOK WEDNESDAY THRU FRIDAY: FAIR TO GOOD.



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


END/GF