FPCN39 CWLW 091336
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 9 AUGUST 1999 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      14   22     650   1     75   29    2050   5
KAMLOOPS     KEL      40   23    1250   4     97   30    2650   7
OKANAGAN     KEL       9   20     600   0     82   28    2150   6
CASTLEGAR    SPOK     24   20     850   5     51   26    2100   3
CRANBROOK    SPOK      9   17     950   0     76   25    3950   3
REVELSTOKE   KEL       9   19     600   0     43   23    1500   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W    9   W   11
CRANBROOK             W    9   W   17

TODAY'S VENTING:Poor becoming good by this afternoon.

VENTING FOR TUESDAY: 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   18    3950  11    100   23    3950  11
PR. GEORGE   P.G.     41   17    1050  11    100   22    3700  19
SMITHERS     P.G.      9   14     500   2     92   20    1700  13
WELLS GRAY   P.G.      9   10     500  10    100   24    4000  21
FT NLSN      F.N.     48   15     950   8     61   17    1200   8
FT STJOHN    F.N.     79   19    2400   6    100   25    3700   7

*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   19   W   28
SMITHERS              W   17   W   28

TODAY'S VENTING: Fair becoming good.


VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     51   20     500  12     83   23    1200  11
FRASER VLY   QUIL     50   20     450  12     95   25    1600  10
SRN VRISL    QUIL     40   19     400  10     73   23     950  10
CNTRL VRISL  QUIL     53   21     600  10     85   24    1300  10
NRN VRISL    HRDY     38   16     500   7     64   18     800   9
TERRACE      ANT     100   17    1850  11    100   20    2100  11
STEWART      ANT      64   16    1050   7    100   20    1950   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W    9   W    9   W    9
PORT HARDY   NW  13   W    9   W   19
SANDSPIT     NW  17   NW  22   W   30

TODAY'S VENTING:fair becoming good in the afternoon.


VENTING FOR TUESDAY: GOOD


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

END/lm