FPCN39 CWLW 061430
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 Saturday 6 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      18   17     650   2    100   22    3200  18
KAMLOOPS     KEL      36   16    1000   5    100   22    3350  10
OKANAGAN     KEL      11   14     600   1    100   21    3350  10
CASTLEGAR    SPOK     39   16     900   8    100   22    2200  10
CRANBROOK    SPOK     45   15    1600   8    100   20    3950  12
REVELSTOKE   KEL      50   14     900   8    100   18    2650  10

*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    VR   5   W   11   W   22
CRANBROOK             W    9   W   26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         15 C
SPOKANE         1000 m         15 C

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.    100   12    2250  17    100   18    3950  10
PR. GEORGE   P.G.     67   12    1300  13    100   17    3700  10
SMITHERS     P.G.     16   10     700   4     93   14    3400  10
WELLS GRAY   P.G.    100   13    2600  18    100   19    4000  10
FT NLSN      F.N.      9   12     400  15     91   16    3650  10
FT STJOHN    F.N.      9   11     700  15     93   16    3850  10

*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            SW  20   W   28
SMITHERS              VR   5   S   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         14 C
FT. NELSON       700 m         16 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    QUIL     31   16     650   4     73   22    2400   8
FRASER VLY   QUIL     17   15     250   4     73   22    2400   8
SRN VRISL    QUIL     16   14     200   4     61   20    1750   8
CNTRL VRISL  QUIL     16   14     200   4     79   18    2250  10
NRN VRISL    HRDY     13   13     200   2    100   16    2450  18
TERRACE      ANT       9   14     250   7    100   18    2450  16
STEWART      ANT       9   14     100   0     82   18    2450  16

*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    VR   5   SW  17   SW  28
PORT HARDY   SE  65   S   72   SW  74
SANDSPIT     SE  78   SE  65   SE  44

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       200 m         14 C
PORT HARDY       500 m         15 C
ANNETTE          700 m         15 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