FPCN39 CWLW 111400
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 SATURDAY 11 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      31   15     700   5    100   23    3200  12
KAMLOOPS     KEL      24   13     700   5    100   22    3350  12
OKANAGAN     KEL      22   12     650   5    100   22    3350  12
CASTLEGAR    SPOK     49   14     800  15    100   22    2450  20
CRANBROOK    SPOK    100   13    1800  23    100   21    3950  21
REVELSTOKE   KEL      20   12     700   5    100   17    3450  12

*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   N   13   N   19
CRANBROOK             VR   5   NW  13

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.      9    8     950  11    100   17    3950   9
PR. GEORGE   P.G.     27    8     950   8     95   16    2600   8
SMITHERS     P.G.     21    9     900   3     86   16    2400   7
WELLS GRAY   P.G.     20    9     850   5    100   17    4000   9
FT NLSN      F.N.     13    9     500   3    100   15    1650  22
FT STJOHN    F.N.     95   11    1250  27    100   17    3700  31

*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            W   15   NW  30
SMITHERS              W    9   W   30

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     29   16     200  16     74   20     650  16
FRASER VLY   QUIL     36   17     250  16    100   26    1850  15
SRN VRISL    QUIL      9   14     200   0     56   21     750   8
CNTRL VRISL  QUIL      9   15     200   0     76   22     950  11
NRN VRISL    HRDY     37   13     600   6     50   17     850   6
TERRACE      ANT      60   12     750  13    100   17    3200  13
STEWART      ANT      18   13     500   2     76   17    1350   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
VANCOUVER    NE  15   NE  19   NE  22
PORT HARDY   VR   5   NE  11   N   13
SANDSPIT     S   24   SW  30   SW  37

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

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

END/MWSO
$$$$^^