FPCN39 CWLW 171401
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 WEDNESDAY 17 SEPTEMBER 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   13     200   5     46   16    1400   8
KAMLOOPS     KEL      25   13     900   5     47   16    1400   6
OKANAGAN     KEL      25   13     900   5     47   16    1400   6
CASTLEGAR    SPOK      9   12     500   5     48   15    1450   8
CRANBROOK    SPOK     10   11     950   5     50   15    1450   8
REVELSTOKE   KEL      10   11     500   5     45   13    1450   5

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   W   19   W   31
CRANBROOK             SW  20   W   50

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1500 m         16 C
SPOKANE         1700 m         17 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: POOR.




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.     71   10    2050   8     50   13    2250  11
PR. GEORGE   P.G.     37    9    1050   9     49   13    2200   9
SMITHERS     P.G.     29    9     900   6     49   12    2250   7
WELLS GRAY   P.G.     87   11    2450   9     60   13    2500  11
FT NLSN      F.N.     66    6    1100  10     50    9    2000  11
FT STJOHN    F.N.     70    4    1450  11     50    7    2350  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  35   NE  30
SMITHERS              NE  22   NE  30

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1100 m         10 C
FT. NELSON      NO INVERSION

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: FAIR TO GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: POOR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     97   14     800  12     70   16    1750  15
FRASER VLY   QUIL     63   15     400  10     70   16    1750  15
SRN VRISL    QUIL     20   15     250  10     80   17    1700  12
CNTRL VRISL  QUIL      9   13      50   5     61   16    1750  10
NRN VRISL    HRDY     41   12     400  10     75   15    1800  10
TERRACE      ANT       9   12     200  12     75   16    1950  10
STEWART      ANT      16   13     100   6     71   16    1800   9

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   SW  19   W   17
PORT HARDY   NW  26   NW  33   NW  35
SANDSPIT     N   50   N   46   N   44

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NO INVERSION
PORT HARDY      1500 m         19 C
ANNETTE          700 m         18 C

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD.

VENTING OUTLOOK FRIDAY THRU SUNDAY: POOR.




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


END/JMS