FPCN39 CWLW 061400
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 6 SEPTEMBER 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      17   16     450   3    100   19    2150  13
KAMLOOPS     KEL      13   15     500   3    100   20    2750  16
OKANAGAN     KEL      15   16     550   3    100   20    2750  16
CASTLEGAR    SPOK     44   14     900   5    100   17    3500  11
CRANBROOK    SPOK     66   12    1200   6    100   17    3950  14
REVELSTOKE   KEL       9   13     450   3     92   15    2550   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   15   W   30   W   43
CRANBROOK             W   19   W   44

TODAY'S VENTING: GOOD.

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.     58   11    2400  12    100   15    3950  21
PR. GEORGE   P.G.     56   11    1800  10    100   15    2750  20
SMITHERS     P.G.     51   12    1300   8    100   16    2600  19
WELLS GRAY   P.G.     53   10    1500  12    100   15    4000  21
FT NLSN      F.N.      9   12     400   8     64   13     750   9
FT STJOHN    F.N.     10   11     700  19     98   14    1650  17

*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   56   NW  52
SMITHERS              W   35   W   52

TODAY'S VENTING: 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     42   14    1000  12     86   19    2800  10
FRASER VLY   QUIL     36   12     500   8     85   20    2000   8
SRN VRISL    QUIL     38   13     500  10     84   20    2200  10
CNTRL VRISL  QUIL     35   13     800   8     79   16    2200   8
NRN VRISL    HRDY     46   13     450  10    100   16    3000  15
TERRACE      ANT      38   14     450   7     92   15    2700  15
STEWART      ANT      34   13     300   5     82   14    2200  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   26   W   33   NW  43
PORT HARDY   W   19   NW  28   NW  43
SANDSPIT     W   24   W   28   W   31

TODAY'S VENTING: good.

VENTING FOR TUESDAY: GOOD

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


END/MWSO
$$$$^^