FPCN39 CWLW 161433
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 16 August 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      21   22     600   3     75   25    1350   8
KAMLOOPS     KEL      22   21     650   5     83   25    1800   8
OKANAGAN     KEL      15   20     550   3     83   25    1800   8
CASTLEGAR    SPOK     27   18     750   8    100   24    3500  17
CRANBROOK    SPOK     10   14     950  18    100   19    2050  21
REVELSTOKE   KEL      10   18     500   3     70   23    1500   8

*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   VR   5   VR   5
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         600 m         20 C
SPOKANE         750 m         17 C

TODAY'S VENTING: GOOD IN THE AFTERNOON.




VENTING FOR SUNDAY: GOOD




VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO 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.     64   13    1500  13    100   21    3950  13
PR. GEORGE   P.G.     40   13    1100   9    100   20    2700  12
SMITHERS     P.G.     41   15    1150   6    100   23    2800  11
WELLS GRAY   P.G.     83   14    2000  12    100   22    4000  13
FT NLSN      F.N.      9   14     400   3     62   21    2350   4
FT STJOHN    F.N.      9   12     700   3     47   16    2000   4

*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            NE  17   N   15
SMITHERS              E   11   E   15

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1300 m         17 C
FT. NELSON       800 m         17 C

TODAY'S VENTING: GOOD IN THE AFTERNOON EXCEPT REMAINING FAIR
IN THE PEACE COUNTRY.


VENTING FOR SUNDAY: GOOD




VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     44   20     300  19     53   24     350  10
FRASER VLY   QUIL     49   21     300  19     85   28     900  10
SRN VRISL    QUIL      9   19     250   0      9   26     400   5
CNTRL VRISL  QUIL      9   22     300   0     70   29    1450  10
NRN VRISL    HRDY      9   15       0   5     19   19     200   5
TERRACE      ANT       9   20     200   4     47   26    2450   2
STEWART      ANT      13   18      50   7     63   26    2150   3

*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   VR   5   N   11
PORT HARDY   NW  11   VR   5   VR   5
SANDSPIT     N   24   N   22   N   19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      750 m         28 C
PORT HARDY      790 m         28 C
ANNETTE         520 m         25 C

TODAY'S VENTING: POOR TO FAIR WITH LOCALLY GOOD VENTING
IN AREAS OF MODERATE WINDS.




VENTING FOR SUNDAY: FAIR TO GOOD.




VENTING OUTLOOK MONDAY THRU WEDNESDAY: FAIR TO GOOD.




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

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