FPCN39 CWLW 021450
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Tuesday 2 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      13   21     550   1     70   26    1900   2
KAMLOOPS     KEL      11   21     550   1     70   27    1900   6
OKANAGAN     KEL      11   20     550   1     70   27    1850   6
CASTLEGAR    SPOK     22   21     750   5     60   26    1800   5
CRANBROOK    SPOK      9   19     950   6     80   26    2350   6
REVELSTOKE   KEL      10   18     500   1     40   24    1200   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW   9   SW  28
CRANBROOK             W    9   SW  22

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1200 m         24 C
SPOKANE         1500 m         28 C

TODAY'S VENTING: Becoming good in the afternoon.



VENTING FOR WEDNESDAY: Good.


VENTING OUTLOOK THURSDAY THRU SATURDAY: Generally good during the
afternoons.


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.    100   16    3950  29    100   22    3950  29
PR. GEORGE   P.G.     24   16     750  19    100   20    3700  28
SMITHERS     P.G.      9   14     500   9     44   18     800  14
WELLS GRAY   P.G.    100   17    4000  29    100   23    4000  29
FT NLSN      F.N.      9   15     400   5     66   22    1750   5
FT STJOHN    F.N.      9   17     700   5     87   22    2600   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  22   SW  33
SMITHERS              S   26   SW  33

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      800 m          17 C
FT. NELSON      700 m          21 C

TODAY'S VENTING: Good.


VENTING FOR WEDNESDAY: Good.


VENTING OUTLOOK THURSDAY THRU SATURDAY: Becoming good in the
afternoon.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     22   17     250   8     81   21    1150  10
FRASER VLY   QUIL     73   20     950  10    100   23    1700  11
SRN VRISL    QUIL     22   17     200   7     86   22    1300  10
CNTRL VRISL  QUIL     26   18     300   7     87   22    1300  10
NRN VRISL    HRDY     16   16     200   4     50   19     750   7
TERRACE      ANT      96   16     900  23    100   21    2450  22
STEWART      ANT      55   17     500  12    100   21    1750  20


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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   SW  28
PORT HARDY   S   24   S   30   SW  30
SANDSPIT     S   41   S   44   S   44

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         17 C
PORT HARDY       300 m         16 C
ANNETTE           n/a          n/a

TODAY'S VENTING:  Good except fair along the outer coast.


VENTING FOR WEDNESDAY: GOOD.


VENTING OUTLOOK THURSDAY THRU SATURDAY: Generally good.


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

END/GF